From 48b4287392a76d18deb8b8f55e5b1a7261ecac2e Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Tue, 19 May 2015 21:27:01 +0200
Subject: [PATCH] Cast-less img XPath search
---
Doc/Sda1/dom.xml | 1664 +++++++++--------
P/Sda1/ImageSearch/pom.xml | 18 +-
P/Sda1/NoCast/.gitignore | 5 +
P/Sda1/NoCast/pom.xml | 37 +
.../mi/sda1/nocast/DomXpath.java | 44 +
.../mi/sda1/nocast/driver/DomXpathDriver.java | 22 +
P/Sda1/NoCast/src/main/resources/gallery.html | 26 +
P/pom.xml | 2 +
8 files changed, 976 insertions(+), 842 deletions(-)
create mode 100644 P/Sda1/NoCast/.gitignore
create mode 100644 P/Sda1/NoCast/pom.xml
create mode 100644 P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/DomXpath.java
create mode 100644 P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/driver/DomXpathDriver.java
create mode 100644 P/Sda1/NoCast/src/main/resources/gallery.html
diff --git a/Doc/Sda1/dom.xml b/Doc/Sda1/dom.xml
index 320c444a8..6ca960ba1 100644
--- a/Doc/Sda1/dom.xml
+++ b/Doc/Sda1/dom.xml
@@ -1,110 +1,110 @@
- <chapter xml:id="dom" version="5.0" xmlns="http://docbook.org/ns/docbook"
- xmlns:xlink="http://www.w3.org/1999/xlink"
- xmlns:xi="http://www.w3.org/2001/XInclude"
- xmlns:svg="http://www.w3.org/2000/svg"
- xmlns:m="http://www.w3.org/1998/Math/MathML"
- xmlns:html="http://www.w3.org/1999/xhtml"
- xmlns:db="http://docbook.org/ns/docbook">
- <title>The Document Object Model (<acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym>)</title>
-
- <titleabbrev><acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym></titleabbrev>
-
- <section xml:id="domBase">
- <title>Language independent specification</title>
-
- <titleabbrev>Language independence</titleabbrev>
-
- <para>XML documents allow for automated content processing. We already
- discussed the <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> API to access XML
- documents by <xref linkend="glo_Java"/> applications.
- There are however situations where <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> is not
- appropriate:</para>
-
- <itemizedlist>
- <listitem>
- <para>The <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> is event
- based. XML node elements are passed to handler methods. Sometimes
- we want to access neighbouring nodes from a context node in our
- handler methods for example a <tag class="starttag">title</tag>
- following a <tag class="starttag">chapter</tag> node. <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> does not
- offer any support for this. If we need references to neighbouring
- nodes we have to create them ourselves during a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> parsing run.
- This is tedious and leads to code being hard to understand.</para>
- </listitem>
-
- <listitem>
- <para>Some applications may want to select node sets by <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
- expressions which is completely impossible in a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym>
- application.</para>
- </listitem>
-
- <listitem>
- <para>We may want to move subtrees within a document itself (for
- example exchanging two <tag class="starttag">chapter</tag> nodes)
- or even transferring them to a different document.</para>
- </listitem>
- </itemizedlist>
-
- <para>The greatest deficiency of the <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> is the fact that
- an XML instance is not represented as a tree like structure but as a
- succession of events. The <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> allows us to
- represent XML document instances as tree like structures and thus
- enables navigational operations between nodes.</para>
-
- <para>In order to achieve language <emphasis>and</emphasis> software
- vendor independence the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> approach uses two
- stages:</para>
-
- <itemizedlist>
- <listitem>
- <para>The <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> is formulated in
- an Interface Definition Language (<abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>)</para>
- </listitem>
-
- <listitem>
- <para>In order to use the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> API by a concrete
- programming language a so called <emphasis>language
- binding</emphasis> is required. In languages like <xref linkend="glo_Java"/> the
- language binding will still be a set of <xref linkend="glo_Java"/>
- interfaces. Thus for actually coding an application an
- implementation of these interfaces is needed</para>
- </listitem>
- </itemizedlist>
-
- <para>So what exactly may an <abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
- be? The programming language <xref linkend="glo_Java"/> already allows
- pure interface definitions without any implementation. In C++ the same
- result can be achieved by so called <emphasis>pure virtual
- classes</emphasis>. An <abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
- offers extended features to describe such interfaces. For <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> the <productname
- xlink:href="http://www.omg.org/gettingstarted/corbafaq.htm">CORBA
- 2.2</productname> <abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
- had been chosen to describe an XML document programming interface. As
- a first example we take an excerpt from the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym>'s <link
- xlink:href="http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-1950641247">Node</link>
- interface definition:</para>
-
- <programlisting language="none">interface Node {
+<?xml version="1.0" encoding="UTF-8"?>
+<chapter version="5.0" xml:id="dom" xmlns="http://docbook.org/ns/docbook"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:svg="http://www.w3.org/2000/svg"
+ xmlns:m="http://www.w3.org/1998/Math/MathML"
+ xmlns:html="http://www.w3.org/1999/xhtml"
+ xmlns:db="http://docbook.org/ns/docbook">
+ <title>The Document Object Model (<acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym>)</title>
+
+ <titleabbrev><acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym></titleabbrev>
+
+ <section xml:id="domBase">
+ <title>Language independent specification</title>
+
+ <titleabbrev>Language independence</titleabbrev>
+
+ <para>XML documents allow for automated content processing. We already
+ discussed the <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> API to access XML
+ documents by <xref linkend="glo_Java"/> applications. There are however
+ situations where <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> is not
+ appropriate:</para>
+
+ <itemizedlist>
+ <listitem>
+ <para>The <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> is event based.
+ XML node elements are passed to handler methods. Sometimes we want to
+ access neighbouring nodes from a context node in our handler methods
+ for example a <tag class="starttag">title</tag> following a <tag
+ class="starttag">chapter</tag> node. <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> does not offer
+ any support for this. If we need references to neighbouring nodes we
+ have to create them ourselves during a <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> parsing run. This
+ is tedious and leads to code being hard to understand.</para>
+ </listitem>
+
+ <listitem>
+ <para>Some applications may want to select node sets by <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> expressions
+ which is completely impossible in a <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym>
+ application.</para>
+ </listitem>
+
+ <listitem>
+ <para>We may want to move subtrees within a document itself (for
+ example exchanging two <tag class="starttag">chapter</tag> nodes) or
+ even transferring them to a different document.</para>
+ </listitem>
+ </itemizedlist>
+
+ <para>The greatest deficiency of the <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> is the fact that an
+ XML instance is not represented as a tree like structure but as a
+ succession of events. The <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> allows us to represent
+ XML document instances as tree like structures and thus enables
+ navigational operations between nodes.</para>
+
+ <para>In order to achieve language <emphasis>and</emphasis> software
+ vendor independence the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> approach uses two
+ stages:</para>
+
+ <itemizedlist>
+ <listitem>
+ <para>The <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> is
+ formulated in an Interface Definition Language (<abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>)</para>
+ </listitem>
+
+ <listitem>
+ <para>In order to use the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> API by a concrete
+ programming language a so called <emphasis>language binding</emphasis>
+ is required. In languages like <xref linkend="glo_Java"/> the language
+ binding will still be a set of <xref linkend="glo_Java"/> interfaces.
+ Thus for actually coding an application an implementation of these
+ interfaces is needed</para>
+ </listitem>
+ </itemizedlist>
+
+ <para>So what exactly may an <abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
+ be? The programming language <xref linkend="glo_Java"/> already allows
+ pure interface definitions without any implementation. In C++ the same
+ result can be achieved by so called <emphasis>pure virtual
+ classes</emphasis>. An <abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
+ offers extended features to describe such interfaces. For <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> the <productname
+ xlink:href="http://www.omg.org/gettingstarted/corbafaq.htm">CORBA
+ 2.2</productname> <abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
+ had been chosen to describe an XML document programming interface. As a
+ first example we take an excerpt from the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym>'s <link
+ xlink:href="http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-1950641247">Node</link>
+ interface definition:</para>
+
+ <programlisting language="none">interface Node {
// NodeType
const unsigned short ELEMENT_NODE = 1;
const unsigned short ATTRIBUTE_NODE = 2;
@@ -126,20 +126,20 @@
raises(DOMException);
...</programlisting>
- <para>If we want to implement the <abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
- <classname>org.w3c.dom.Node</classname> specification in e.g. <xref linkend="glo_Java"/> a language
- binding has to be defined. This means writing <xref linkend="glo_Java"/> code which
- closely resembles the <abbrev
- xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
- specification. Obviously this task depends on and is restricted by the
- constructs being offered by the target programming language. The W3C
- <link
- xlink:href="http://www.w3.org/TR/DOM-Level-3-Core/java-binding.html">defines</link>
- the <xref linkend="glo_Java"/>
- <classname>org.w3c.dom.Node</classname> interface by:</para>
-
- <programlisting language="none">package org.w3c.dom;
+ <para>If we want to implement the <abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
+ <classname>org.w3c.dom.Node</classname> specification in e.g. <xref
+ linkend="glo_Java"/> a language binding has to be defined. This means
+ writing <xref linkend="glo_Java"/> code which closely resembles the
+ <abbrev
+ xlink:href="http://en.wikipedia.org/wiki/Interface_description_language">IDL</abbrev>
+ specification. Obviously this task depends on and is restricted by the
+ constructs being offered by the target programming language. The W3C <link
+ xlink:href="http://www.w3.org/TR/DOM-Level-3-Core/java-binding.html">defines</link>
+ the <xref linkend="glo_Java"/> <classname>org.w3c.dom.Node</classname>
+ interface by:</para>
+
+ <programlisting language="none">package org.w3c.dom;
public interface Node {
public static final short ELEMENT_NODE = 1; // Node Types
@@ -160,139 +160,136 @@ public interface Node {
...
}</programlisting>
- <para>We take
- <methodname>org.w3c.dom.Node.getChildNodes()</methodname> as an
- example:</para>
-
- <figure xml:id="domRetrieveChildren">
- <title>Retrieving child nodes of a given context node</title>
-
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/domtree.fig" scale="65"/>
- </imageobject>
- </mediaobject>
- </figure>
-
- <para>The <classname>org.w3c.dom.Node</classname> interface offers a
- set of common operations for objects being part of a XML document. But
- a XML document tree contains different types of nodes such as:</para>
-
- <itemizedlist>
- <listitem>
- <para>Elements</para>
- </listitem>
-
- <listitem>
- <para>Attributes</para>
- </listitem>
-
- <listitem>
- <para>Entities</para>
- </listitem>
- </itemizedlist>
-
- <para>An XML API may address this issue by offering data types to
- represent these different kinds of nodes. The <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> <xref linkend="glo_Java"/> Binding
- defines an inheritance hierarchy of interfaces for this
- purpose:</para>
-
- <figure xml:id="domJavaNodeInterfaces">
- <title>Inheritance interface hierarchy in the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> <xref linkend="glo_Java"/>
- binding</title>
-
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/nodeHierarchy.svg"/>
- </imageobject>
- </mediaobject>
- </figure>
-
- <para>Two commonly used <xref linkend="glo_Java"/>
- implementations of these interfaces are:</para>
-
- <variablelist>
- <varlistentry>
- <term>Xerces</term>
-
- <listitem>
- <para><orgname
- xlink:href="http://xml.apache.org/xerces2-j">Apache Software
- foundation</orgname></para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term>Jaxp</term>
-
- <listitem>
- <para><orgname xlink:href="http://java.sun.com/xml/jaxp">Sun
- microsystems</orgname></para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>Both implementations offer additional interfaces beyond the
- <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>'s
- scope.</para>
-
- <para>Going back to the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> itself the
- specification is divided into <link
- xlink:href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/introduction.html#DOMArchitecture-h2">modules</link>:</para>
-
- <figure xml:id="figureDomModules">
- <title><acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
- modules.</title>
-
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Screen/dom-architecture.screen.png"/>
- </imageobject>
- </mediaobject>
- </figure>
- </section>
-
- <section xml:id="domCreate">
- <title>Creating a new document from scratch</title>
-
- <titleabbrev>New document</titleabbrev>
-
- <para>If we want to export non-XML content (e.g. from a RDBMS) into
- XML we may achieve this by the following recipe:</para>
-
- <orderedlist>
- <listitem>
- <para>Create a document builder instance.</para>
- </listitem>
-
- <listitem>
- <para>Create an empty <link
- xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/org/w3c/dom/Document.html">Document</link>
- instance.</para>
- </listitem>
-
- <listitem>
- <para>Fill in the desired Elements and Attributes.</para>
- </listitem>
-
- <listitem>
- <para>Create a serializer.</para>
- </listitem>
-
- <listitem>
- <para>Serialize the resulting tree to a stream.</para>
- </listitem>
- </orderedlist>
-
- <para>An introductory piece of code illustrates these steps:</para>
-
- <figure xml:id="simpleDomCreate">
- <title>Creation of a XML document instance from scratch.</title>
-
- <programlisting language="none">package dom;
+ <para>We take <methodname>org.w3c.dom.Node.getChildNodes()</methodname> as
+ an example:</para>
+
+ <figure xml:id="domRetrieveChildren">
+ <title>Retrieving child nodes of a given context node</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/domtree.fig" scale="65"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+
+ <para>The <classname>org.w3c.dom.Node</classname> interface offers a set
+ of common operations for objects being part of a XML document. But a XML
+ document tree contains different types of nodes such as:</para>
+
+ <itemizedlist>
+ <listitem>
+ <para>Elements</para>
+ </listitem>
+
+ <listitem>
+ <para>Attributes</para>
+ </listitem>
+
+ <listitem>
+ <para>Entities</para>
+ </listitem>
+ </itemizedlist>
+
+ <para>An XML API may address this issue by offering data types to
+ represent these different kinds of nodes. The <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> <xref
+ linkend="glo_Java"/> Binding defines an inheritance hierarchy of
+ interfaces for this purpose:</para>
+
+ <figure xml:id="domJavaNodeInterfaces">
+ <title>Inheritance interface hierarchy in the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> <xref
+ linkend="glo_Java"/> binding</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/nodeHierarchy.svg"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+
+ <para>Two commonly used <xref linkend="glo_Java"/> implementations of
+ these interfaces are:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term>Xerces</term>
+
+ <listitem>
+ <para><orgname xlink:href="http://xml.apache.org/xerces2-j">Apache
+ Software foundation</orgname></para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Jaxp</term>
+
+ <listitem>
+ <para><orgname xlink:href="http://java.sun.com/xml/jaxp">Sun
+ microsystems</orgname></para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+
+ <para>Both implementations offer additional interfaces beyond the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym>'s scope.</para>
+
+ <para>Going back to the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> itself the specification
+ is divided into <link
+ xlink:href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/introduction.html#DOMArchitecture-h2">modules</link>:</para>
+
+ <figure xml:id="figureDomModules">
+ <title><acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
+ modules.</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Screen/dom-architecture.screen.png"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+ </section>
+
+ <section xml:id="domCreate">
+ <title>Creating a new document from scratch</title>
+
+ <titleabbrev>New document</titleabbrev>
+
+ <para>If we want to export non-XML content (e.g. from a RDBMS) into XML we
+ may achieve this by the following recipe:</para>
+
+ <orderedlist>
+ <listitem>
+ <para>Create a document builder instance.</para>
+ </listitem>
+
+ <listitem>
+ <para>Create an empty <link
+ xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/org/w3c/dom/Document.html">Document</link>
+ instance.</para>
+ </listitem>
+
+ <listitem>
+ <para>Fill in the desired Elements and Attributes.</para>
+ </listitem>
+
+ <listitem>
+ <para>Create a serializer.</para>
+ </listitem>
+
+ <listitem>
+ <para>Serialize the resulting tree to a stream.</para>
+ </listitem>
+ </orderedlist>
+
+ <para>An introductory piece of code illustrates these steps:</para>
+
+ <figure xml:id="simpleDomCreate">
+ <title>Creation of a XML document instance from scratch.</title>
+
+ <programlisting language="none">package dom;
...
public class CreateDoc {
public static void main(String[] args) throws Exception {
@@ -315,45 +312,45 @@ public class CreateDoc {
printer.output(titel, System.out);</emphasis>
}
}</programlisting>
- </figure>
+ </figure>
- <para>We get the following result:</para>
+ <para>We get the following result:</para>
- <programlisting language="none"><?xml version="1.0" encoding="UTF-8"?>
+ <programlisting language="none"><?xml version="1.0" encoding="UTF-8"?>
<titel date="23.02.2000">Versuch 1</titel></programlisting>
- </section>
+ </section>
- <section xml:id="domCreateExercises">
- <title>Exercises</title>
+ <section xml:id="domCreateExercises">
+ <title>Exercises</title>
- <qandaset defaultlabel="qanda" xml:id="createDocModify">
- <title>A sub structured <tag class="starttag">title</tag></title>
+ <qandaset defaultlabel="qanda" xml:id="createDocModify">
+ <title>A sub structured <tag class="starttag">title</tag></title>
- <qandadiv>
- <qandaentry>
- <question>
- <label>Creation of an extended XML document instance</label>
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <label>Creation of an extended XML document instance</label>
- <para>In order to run the examples given during the lecture
- the <filename
- xlink:href="http://www.jdom.org/downloads">jdom2.jar</filename>
- library must be added to the <envar>CLASSPATH</envar>.</para>
+ <para>In order to run the examples given during the lecture the
+ <filename
+ xlink:href="http://www.jdom.org/downloads">jdom2.jar</filename>
+ library must be added to the <envar>CLASSPATH</envar>.</para>
- <para>The <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> creating
- example given before may be used as a starting point. Extend
- the <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
- tree created in <xref linkend="simpleDomCreate"/> to produce
- an extended XML document:</para>
+ <para>The <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> creating example
+ given before may be used as a starting point. Extend the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> tree created in
+ <xref linkend="simpleDomCreate"/> to produce an extended XML
+ document:</para>
- <programlisting language="none"><title>
+ <programlisting language="none"><title>
<long>The long version of this title</long>
<short>Short version</short>
</title></programlisting>
- </question>
+ </question>
- <answer>
- <programlisting language="none">package dom;
+ <answer>
+ <programlisting language="none">package dom;
...
public class CreateExtended {
/**
@@ -381,54 +378,52 @@ public class CreateExtended {
printer.output(titel, System.out);
}
}</programlisting>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
- </section>
-
- <section xml:id="domParse">
- <title>Parsing existing XML documents</title>
-
- <titleabbrev>Parsing</titleabbrev>
-
- <para>We already used a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> to parse an XML
- document. Rather than handling <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> events ourselves
- these events may be used to construct a <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> representation of our
- document. This work is done by an instance of. We use our catalog
- example from <xref linkend="simpleCatalog"/> as an introductory
- example.</para>
-
- <para>We already noticed the need for an
- <classname>org.xml.sax.ErrorHandler</classname> object during <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> processing. A
- <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> Parser
- requires a similar type of Object in order to react to parsing errors
- in a meaningful way. In principle a <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> parser implementor is
- free to choose his implementation but most implementations are based
- on top of a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> parser. For this
- reason it was natural to choose a <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> error handling
- interface which is similar to a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym>
- <classname>org.xml.sax.ErrorHandler</classname>. The following code
- serves the needs described before:</para>
-
- <figure xml:id="domTreeTraversal">
- <title>Accessing a XML Tree purely by <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> methods.</title>
-
- <programlisting language="none">package dom;
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+
+ <section xml:id="domParse">
+ <title>Parsing existing XML documents</title>
+
+ <titleabbrev>Parsing</titleabbrev>
+
+ <para>We already used a <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> to parse an XML
+ document. Rather than handling <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> events ourselves
+ these events may be used to construct a <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> representation of our
+ document. This work is done by an instance of. We use our catalog example
+ from <xref linkend="simpleCatalog"/> as an introductory example.</para>
+
+ <para>We already noticed the need for an
+ <classname>org.xml.sax.ErrorHandler</classname> object during <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> processing. A
+ <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> Parser requires
+ a similar type of Object in order to react to parsing errors in a
+ meaningful way. In principle a <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> parser implementor is
+ free to choose his implementation but most implementations are based on
+ top of a <acronym xlink:href="http://www.saxproject.org">SAX</acronym>
+ parser. For this reason it was natural to choose a <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> error handling interface
+ which is similar to a <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym>
+ <classname>org.xml.sax.ErrorHandler</classname>. The following code serves
+ the needs described before:</para>
+
+ <figure xml:id="domTreeTraversal">
+ <title>Accessing a XML Tree purely by <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> methods.</title>
+
+ <programlisting language="none">package dom;
...
public class ArticleOrder {
<emphasis role="bold"> // Though we are playing DOM here, a <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> parser still
+ xlink:href="http://www.saxproject.org">SAX</acronym> parser still
// assembles our DOM tree.</emphasis>
private SAXBuilder builder = new SAXBuilder();
@@ -436,8 +431,7 @@ public class ArticleOrder {
<emphasis role="bold">// Though an ErrorHandler is not strictly required it allows
// for easierlocalization of XML document errors</emphasis>
builder.setErrorHandler(new MySaxErrorHandler(System.out));<co
- linkends="domSetSaxErrorHandler-co"
- xml:id="domSetSaxErrorHandler"/>
+ linkends="domSetSaxErrorHandler-co" xml:id="domSetSaxErrorHandler"/>
}
/** Descending a catalog till its <item> elements. For each product
@@ -459,17 +453,17 @@ public class ArticleOrder {
+ ", order number: " + item.getAttributeValue("orderNo"));
} ...</programlisting>
- <para>Note <coref linkend="domSetSaxErrorHandler"
- xml:id="domSetSaxErrorHandler-co"/>: This is our standard <acronym
- xlink:href="http://www.saxproject.org">SAX</acronym> error handler
- implementing the <classname>org.xml.sax.ErrorHandler</classname>
- interface.</para>
- </figure>
+ <para>Note <coref linkend="domSetSaxErrorHandler"
+ xml:id="domSetSaxErrorHandler-co"/>: This is our standard <acronym
+ xlink:href="http://www.saxproject.org">SAX</acronym> error handler
+ implementing the <classname>org.xml.sax.ErrorHandler</classname>
+ interface.</para>
+ </figure>
- <para>Executing this method needs a driver instance providing an input
- XML filename:</para>
+ <para>Executing this method needs a driver instance providing an input XML
+ filename:</para>
- <programlisting language="none">package dom;
+ <programlisting language="none">package dom;
...
public class ArticleOrderDriver {
public static void main(String[] argv) throws Exception {
@@ -478,33 +472,33 @@ public class ArticleOrderDriver {
}
}</programlisting>
- <para>This yields:</para>
+ <para>This yields:</para>
- <programlisting language="none">Article: Swinging headset, order number: 3218
+ <programlisting language="none">Article: Swinging headset, order number: 3218
Article: 200W Stereo Amplifier, order number: 9921</programlisting>
- <para>To illustrate the internal processes we take a look at the
- sequence diagram:</para>
+ <para>To illustrate the internal processes we take a look at the sequence
+ diagram:</para>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/sequenceDomParser.svg"/>
- </imageobject>
- </mediaobject>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/sequenceDomParser.svg"/>
+ </imageobject>
+ </mediaobject>
- <qandaset defaultlabel="qanda" xml:id="exercise_domHtmlSimple">
- <title>Creating HTML output</title>
+ <qandaset defaultlabel="qanda" xml:id="exercise_domHtmlSimple">
+ <title>Creating HTML output</title>
- <qandadiv>
- <qandaentry>
- <question>
- <label>Simple HTML output</label>
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <label>Simple HTML output</label>
- <para>Instead exporting simple text output in <xref
- linkend="domTreeTraversal"/> we may also create HTML pages
- like:</para>
+ <para>Instead exporting simple text output in <xref
+ linkend="domTreeTraversal"/> we may also create HTML pages
+ like:</para>
- <programlisting language="none"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+ <programlisting language="none"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Available articles</title>
@@ -518,37 +512,36 @@ Article: 200W Stereo Amplifier, order number: 9921</programlisting>
</tr>
<tr>
<td align="left"><emphasis role="bold">Swinging headset</emphasis></td><td><emphasis
- role="bold">3218</emphasis></td>
+ role="bold">3218</emphasis></td>
</tr>
<tr>
<td align="left"><emphasis role="bold">200W Stereo Amplifier</emphasis></td><td><emphasis
- role="bold">9921</emphasis></td>
+ role="bold">9921</emphasis></td>
</tr>
</tbody>
</table>
</body>
</html></programlisting>
- <para>Instead of simply writing
- <code>...println(<html>\n\t<head>...)</code>
- statements you are expected to code a more sophisticated
- solution. We may combine<xref linkend="createDocModify"/> and
- <xref linkend="createDocModify"/>. The idea is reading the XML
- catalog instance as a <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> as before.
- Then construct a <emphasis>second</emphasis> <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> tree for the
- desired HTML output and fill in the article information from
- the first <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> tree
- accordingly.</para>
- </question>
-
- <answer>
- <para>We introduce a class
- <classname>solve.dom.HtmlTree</classname>:</para>
-
- <programlisting language="none">package solve.dom;
+ <para>Instead of simply writing
+ <code>...println(<html>\n\t<head>...)</code>
+ statements you are expected to code a more sophisticated solution.
+ We may combine<xref linkend="createDocModify"/> and <xref
+ linkend="createDocModify"/>. The idea is reading the XML catalog
+ instance as a <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> as before. Then
+ construct a <emphasis>second</emphasis> <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> tree for the
+ desired HTML output and fill in the article information from the
+ first <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
+ tree accordingly.</para>
+ </question>
+
+ <answer>
+ <para>We introduce a class
+ <classname>solve.dom.HtmlTree</classname>:</para>
+
+ <programlisting language="none">package solve.dom;
...
package solve.dom;
@@ -573,16 +566,16 @@ public class HtmlTree {
public HtmlTree(final String titleText,
final String[] tableHeaderFields) { <co
- linkends="programlisting_catalog2html_htmlskel_co"
- xml:id="programlisting_catalog2html_htmlskel"/>
+ linkends="programlisting_catalog2html_htmlskel_co"
+ xml:id="programlisting_catalog2html_htmlskel"/>
DocType doctype = new DocType("html",
"-//W3C//DTD XHTML 1.0 Strict//EN",
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd");
final Element htmlRoot = new Element("html"); <co
- linkends="programlisting_catalog2html_tablehead_co"
- xml:id="programlisting_catalog2html_tablehead"/>
+ linkends="programlisting_catalog2html_tablehead_co"
+ xml:id="programlisting_catalog2html_tablehead"/>
htmlOutput = new Document(htmlRoot);
htmlOutput.setDocType(doctype);
@@ -610,8 +603,8 @@ public class HtmlTree {
}
public void appendItem(final String itemName, final String orderNo) {<co
- linkends="programlisting_catalog2html_insertproduct_co"
- xml:id="programlisting_catalog2html_insertproduct"/>
+ linkends="programlisting_catalog2html_insertproduct_co"
+ xml:id="programlisting_catalog2html_insertproduct"/>
final Element tr = new Element("tr");
tableBody.addContent(tr);
tr.addContent(new Element("td").addContent(new Text(itemName)));
@@ -641,12 +634,12 @@ public class HtmlTree {
</programlisting>
- <calloutlist>
- <callout arearefs="programlisting_catalog2html_htmlskel"
- xml:id="programlisting_catalog2html_htmlskel_co">
- <para>A basic HTML skeleton is is being created:</para>
+ <calloutlist>
+ <callout arearefs="programlisting_catalog2html_htmlskel"
+ xml:id="programlisting_catalog2html_htmlskel_co">
+ <para>A basic HTML skeleton is is being created:</para>
- <programlisting language="none"><?xml version="1.0" encoding="UTF-8"?>
+ <programlisting language="none"><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
@@ -662,16 +655,16 @@ public class HtmlTree {
</body>
</html></programlisting>
- <para>The table containing the product's data is empty at
- this point and thus invalid.</para>
- </callout>
+ <para>The table containing the product's data is empty at this
+ point and thus invalid.</para>
+ </callout>
- <callout arearefs="programlisting_catalog2html_tablehead"
- xml:id="programlisting_catalog2html_tablehead_co">
- <para>The table's header is appended but the actual data
- from our two products is still missing:</para>
+ <callout arearefs="programlisting_catalog2html_tablehead"
+ xml:id="programlisting_catalog2html_tablehead_co">
+ <para>The table's header is appended but the actual data from
+ our two products is still missing:</para>
- <programlisting language="none">... <h1>Available articles</h1>
+ <programlisting language="none">... <h1>Available articles</h1>
<table>
<tbody>
<tr>
@@ -680,16 +673,16 @@ public class HtmlTree {
<emphasis role="bold"></tr></emphasis><!-- Data to be appended after this row in next step -->
<emphasis role="bold"></tbody></emphasis>
</table> ...</programlisting>
- </callout>
+ </callout>
- <callout arearefs="programlisting_catalog2html_insertproduct"
- xml:id="programlisting_catalog2html_insertproduct_co">
- <para>Calling
- <methodname>solve.dom.HtmlTree.appendItem(String,String)</methodname>
- once per product completes the creation of our HTML DOM
- tree:</para>
+ <callout arearefs="programlisting_catalog2html_insertproduct"
+ xml:id="programlisting_catalog2html_insertproduct_co">
+ <para>Calling
+ <methodname>solve.dom.HtmlTree.appendItem(String,String)</methodname>
+ once per product completes the creation of our HTML DOM
+ tree:</para>
- <programlisting language="none">... </tr>
+ <programlisting language="none">... </tr>
<tr>
<td>Swinging headset</td>
<td>3218</td>
@@ -699,13 +692,13 @@ public class HtmlTree {
<td>9921</td>
</tr>
</tbody> ...</programlisting>
- </callout>
- </calloutlist>
+ </callout>
+ </calloutlist>
- <para>The class <classname>solve.dom.Article2Html</classname>
- reads the catalog data:</para>
+ <para>The class <classname>solve.dom.Article2Html</classname>
+ reads the catalog data:</para>
- <programlisting language="none">package solve.dom;
+ <programlisting language="none">package solve.dom;
...
public class Article2Html {
@@ -717,8 +710,8 @@ public class Article2Html {
builder.setErrorHandler(new MySaxErrorHandler(System.out));
htmlResult = new HtmlTree("Available articles", new String[] { <co
- linkends="programlisting_catalog2html_glue_createhtmldom_co"
- xml:id="programlisting_catalog2html_glue_createhtmldom"/>
+ linkends="programlisting_catalog2html_glue_createhtmldom_co"
+ xml:id="programlisting_catalog2html_glue_createhtmldom"/>
"Article Description", "Order Number" });
}
@@ -737,122 +730,120 @@ public class Article2Html {
builder.build(filename).getRootElement().getChildren();
for (final Element item : items) { <co
- linkends="programlisting_catalog2html_glue_prodloop_co"
- xml:id="programlisting_catalog2html_glue_prodloop"/>
+ linkends="programlisting_catalog2html_glue_prodloop_co"
+ xml:id="programlisting_catalog2html_glue_prodloop"/>
htmlResult.appendItem(item.getText(), item.getAttributeValue("orderNo")); <co
- linkends="programlisting_catalog2html_glue_insertprod_co"
- xml:id="programlisting_catalog2html_glue_insertprod"/>
+ linkends="programlisting_catalog2html_glue_insertprod_co"
+ xml:id="programlisting_catalog2html_glue_insertprod"/>
}
htmlResult.serialize(out); <co
- linkends="programlisting_catalog2html_glue_serialize_co"
- xml:id="programlisting_catalog2html_glue_serialize"/>
+ linkends="programlisting_catalog2html_glue_serialize_co"
+ xml:id="programlisting_catalog2html_glue_serialize"/>
}
}</programlisting>
- <calloutlist>
- <callout arearefs="programlisting_catalog2html_glue_createhtmldom"
- xml:id="programlisting_catalog2html_glue_createhtmldom_co">
- <para>Create an instance holding a HTML <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> with a
- table header containing the strings <emphasis>Article
- Description</emphasis> and <emphasis>Order
- Number</emphasis>.</para>
- </callout>
-
- <callout arearefs="programlisting_catalog2html_glue_prodloop"
- xml:id="programlisting_catalog2html_glue_prodloop_co">
- <para>Iterate over all product nodes.</para>
- </callout>
-
- <callout arearefs="programlisting_catalog2html_glue_insertprod"
- xml:id="programlisting_catalog2html_glue_insertprod_co">
- <para>Insert the product's name an order number into the
- HTML <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym>.</para>
- </callout>
-
- <callout arearefs="programlisting_catalog2html_glue_serialize"
- xml:id="programlisting_catalog2html_glue_serialize_co">
- <para>Serialize the completed HTML <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> tree to
- the output stream.</para>
- </callout>
- </calloutlist>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
- </section>
-
- <section xml:id="domJavaScript">
- <title>Using <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
- with HTML/Javascript</title>
-
- <para>Due to script language support in a variety of browsers we may
- also use the <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
- to implement client side event handling. As an example we <link
- xlink:href="Sda1/Ref/src/tablesort.html">demonstrate</link> how a HTML
- table can be made sortable by clicking on a header's column. The
- example code along with the code description can be found at <uri
- xlink:href="http://www.kryogenix.org/code/browser/sorttable">http://www.kryogenix.org/code/browser/sorttable</uri>.</para>
-
- <para>Quite remarkably there are only few ingredients required to
- enrich an ordinary static HTML table with this functionality:</para>
+ <calloutlist>
+ <callout arearefs="programlisting_catalog2html_glue_createhtmldom"
+ xml:id="programlisting_catalog2html_glue_createhtmldom_co">
+ <para>Create an instance holding a HTML <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> with a table
+ header containing the strings <emphasis>Article
+ Description</emphasis> and <emphasis>Order
+ Number</emphasis>.</para>
+ </callout>
+
+ <callout arearefs="programlisting_catalog2html_glue_prodloop"
+ xml:id="programlisting_catalog2html_glue_prodloop_co">
+ <para>Iterate over all product nodes.</para>
+ </callout>
+
+ <callout arearefs="programlisting_catalog2html_glue_insertprod"
+ xml:id="programlisting_catalog2html_glue_insertprod_co">
+ <para>Insert the product's name an order number into the HTML
+ <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym>.</para>
+ </callout>
+
+ <callout arearefs="programlisting_catalog2html_glue_serialize"
+ xml:id="programlisting_catalog2html_glue_serialize_co">
+ <para>Serialize the completed HTML <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> tree to the
+ output stream.</para>
+ </callout>
+ </calloutlist>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+
+ <section xml:id="domJavaScript">
+ <title>Using <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym>
+ with HTML/Javascript</title>
+
+ <para>Due to script language support in a variety of browsers we may also
+ use the <acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> to
+ implement client side event handling. As an example we <link
+ xlink:href="Sda1/Ref/src/tablesort.html">demonstrate</link> how a HTML
+ table can be made sortable by clicking on a header's column. The example
+ code along with the code description can be found at <uri
+ xlink:href="http://www.kryogenix.org/code/browser/sorttable">http://www.kryogenix.org/code/browser/sorttable</uri>.</para>
+
+ <para>Quite remarkably there are only few ingredients required to enrich
+ an ordinary static HTML table with this functionality:</para>
+
+ <itemizedlist>
+ <listitem>
+ <para>An external Javascript library has to be included via
+ <code><script type="text/javascript"
+ src="sorttable.js"></code></para>
+ </listitem>
+
+ <listitem>
+ <para>Each sortable HTML table needs:</para>
<itemizedlist>
<listitem>
- <para>An external Javascript library has to be included via
- <code><script type="text/javascript"
- src="sorttable.js"></code></para>
+ <para>A unique <code>id</code> attribute</para>
</listitem>
<listitem>
- <para>Each sortable HTML table needs:</para>
-
- <itemizedlist>
- <listitem>
- <para>A unique <code>id</code> attribute</para>
- </listitem>
-
- <listitem>
- <para>A <code>class="sortable"</code> attribute</para>
- </listitem>
- </itemizedlist>
+ <para>A <code>class="sortable"</code> attribute</para>
</listitem>
</itemizedlist>
- </section>
-
- <section xml:id="domXpath">
- <title>Using <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym></title>
-
- <para><xref linkend="domTreeTraversal"/> demonstrated the possibility
- to traverse trees solely by using <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> Method calls. Though
- this approach is possible it will in general not lead to stable
- applications. Real world examples are often based on large XML
- documents with complex hierarchical structures. Thus using this rather
- primitive approach will foster deeply nested method calls being
- necessary to access desired node sets. In addition changing the
- conceptional schema will require rewriting large code
- portions..</para>
-
- <para>As we already know from <abbrev
- xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> transformations
- <code>Xpath</code> allows to address node sets inside a XML tree. The
- role of <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> can be
- compared to SQL queries when working with relational databases.
- <acronym xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> may
- also be used within <xref linkend="glo_Java"/> code. As a
- first example we show an image filename extracting application
- operating on XHTML documents. The following example contains three
- <tag class="starttag">img</tag> elements:</para>
-
- <figure xml:id="htmlGallery">
- <title>A HTML document containing <code>IMG</code> tags.</title>
-
- <programlisting language="none"><?xml version="1.0"?>
+ </listitem>
+ </itemizedlist>
+ </section>
+
+ <section xml:id="domXpath">
+ <title>Using <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym></title>
+
+ <para><xref linkend="domTreeTraversal"/> demonstrated the possibility to
+ traverse trees solely by using <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> Method calls. Though this
+ approach is possible it will in general not lead to stable applications.
+ Real world examples are often based on large XML documents with complex
+ hierarchical structures. Thus using this rather primitive approach will
+ foster deeply nested method calls being necessary to access desired node
+ sets. In addition changing the conceptional schema will require rewriting
+ large code portions..</para>
+
+ <para>As we already know from <abbrev
+ xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> transformations
+ <code>Xpath</code> allows to address node sets inside a XML tree. The role
+ of <acronym xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> can be
+ compared to SQL queries when working with relational databases. <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> may also be used
+ within <xref linkend="glo_Java"/> code. As a first example we show an
+ image filename extracting application operating on XHTML documents. The
+ following example contains three <tag class="starttag">img</tag>
+ elements:</para>
+
+ <figure xml:id="htmlGallery">
+ <title>A HTML document containing <code>IMG</code> tags.</title>
+
+ <programlisting language="none"><?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
@@ -877,21 +868,20 @@ public class Article2Html {
</body>
</html>
</programlisting>
- </figure>
+ </figure>
- <para>A given HTML document may contain <tag
- class="starttag">img</tag> elements at <emphasis>arbitrary</emphasis>
- positions. It is sometimes desirable to check for existence and
- accessibility of such external objects being necessary for the page's
- correct rendering. A simple XSL script will do first part the job
- namely extracting the <tag class="starttag">img</tag> elements:</para>
+ <para>A given HTML document may contain <tag class="starttag">img</tag>
+ elements at <emphasis>arbitrary</emphasis> positions. It is sometimes
+ desirable to check for existence and accessibility of such external
+ objects being necessary for the page's correct rendering. A simple XSL
+ script will do first part the job namely extracting the <tag
+ class="starttag">img</tag> elements:</para>
- <figure xml:id="gallery2imagelist">
- <title>A <abbrev
- xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> script for
- image name extraction.</title>
+ <figure xml:id="gallery2imagelist">
+ <title>A <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev>
+ script for image name extraction.</title>
- <programlisting language="none"><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ <programlisting language="none"><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:html="http://www.w3.org/1999/xhtml">
<xsl:output method="text"/>
@@ -903,38 +893,37 @@ public class Article2Html {
</xsl:template>
</xsl:stylesheet></programlisting>
- </figure>
-
- <para>Note the necessity for <code>html</code> namespace inclusion
- into the <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> expression in
- <code><xsl:for-each select="//html:img"></code>. A simple
- <code>select="//img"></code> results in an empty node set.
- Executing the <abbrev
- xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> script yields a
- list of image filenames being contained in the HTML page i.e.
- <code>inline.gif one.gif two.gif</code>.</para>
-
- <para>Now we want to write a <xref linkend="glo_Java"/> application
- which allows to check whether these referenced image files do exist
- and have sufficient permissions to be accessed. A simple approach may
- pipe the <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev>
- output to our application which then executes the readability checks.
- Instead we want to incorporate the <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> based search
- into the application. Ignoring Namespaces and trying to resemble the
- <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> actions
- as closely as possible our application will have to search for <link
- xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/org/w3c/dom/Element.html">Element</link>
- Nodes by the <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> expression
- <code>//html:img</code>:</para>
-
- <figure xml:id="domFindImages">
- <title>Extracting <tag class="emptytag">img</tag> element image
- references from a HTML document.</title>
-
- <programlisting language="none">package dom.xpath;
+ </figure>
+
+ <para>Note the necessity for <code>html</code> namespace inclusion into
+ the <acronym xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
+ expression in <code><xsl:for-each select="//html:img"></code>. A
+ simple <code>select="//img"></code> results in an empty node set.
+ Executing the <abbrev
+ xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> script yields a list
+ of image filenames being contained in the HTML page i.e. <code>inline.gif
+ one.gif two.gif</code>.</para>
+
+ <para>Now we want to write a <xref linkend="glo_Java"/> application which
+ allows to check whether these referenced image files do exist and have
+ sufficient permissions to be accessed. A simple approach may pipe the
+ <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> output to
+ our application which then executes the readability checks. Instead we
+ want to incorporate the <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> based search into
+ the application. Ignoring Namespaces and trying to resemble the <abbrev
+ xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> actions as closely
+ as possible our application will have to search for <link
+ xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/org/w3c/dom/Element.html">Element</link>
+ Nodes by the <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> expression
+ <code>//html:img</code>:</para>
+
+ <figure xml:id="domFindImages">
+ <title>Extracting <tag class="emptytag">img</tag> element image
+ references from a HTML document.</title>
+
+ <programlisting language="none">package dom.xpath;
...
public class DomXpath {
private final SAXBuilder builder = new SAXBuilder();
@@ -945,117 +934,148 @@ public class DomXpath {
public void process(final String xhtmlFilename) throws JDOMException, IOException {
final Document htmlInput = builder.build(xhtmlFilename);<co
- linkends="programlisting_java_searchimg_parse_co"
- xml:id="programlisting_java_searchimg_parse"/>
+ linkends="programlisting_java_searchimg_parse_co"
+ xml:id="programlisting_java_searchimg_parse"/>
final XPathExpression<Object> xpath = XPathFactory.instance().compile( "//img" ); <co
- linkends="programlisting_java_searchimg_pf_co"
- xml:id="programlisting_java_searchimg_pf"/> <co
- linkends="programlisting_java_searchimg_newxpath_co"
- xml:id="programlisting_java_searchimg_newxpath"/>
+ linkends="programlisting_java_searchimg_pf_co"
+ xml:id="programlisting_java_searchimg_pf"/> <co
+ linkends="programlisting_java_searchimg_newxpath_co"
+ xml:id="programlisting_java_searchimg_newxpath"/>
final List<Object> images = xpath.evaluate(htmlInput);<co
- linkends="programlisting_java_searchimg_execquery_co"
- xml:id="programlisting_java_searchimg_execquery"/>
+ linkends="programlisting_java_searchimg_execquery_co"
+ xml:id="programlisting_java_searchimg_execquery"/>
for (Object o: images) { <co
- linkends="programlisting_java_searchimg_loop_co"
- xml:id="programlisting_java_searchimg_loop"/>
+ linkends="programlisting_java_searchimg_loop_co"
+ xml:id="programlisting_java_searchimg_loop"/>
final Element image = (Element ) o;<co
- linkends="programlisting_java_searchimg_cast_co"
- xml:id="programlisting_java_searchimg_cast"/>
+ linkends="programlisting_java_searchimg_cast_co"
+ xml:id="programlisting_java_searchimg_cast"/>
System.out.print(image.getAttribute("src") + " ");
}
}
}</programlisting>
- <caption>
- <para>This application searches for <tag
- class="emptytag">img</tag> elements and shows their
- <code>src</code> attribute value.</para>
- </caption>
- </figure>
-
- <calloutlist>
- <callout arearefs="programlisting_java_searchimg_parse"
- xml:id="programlisting_java_searchimg_parse_co">
- <para>Parse a XHTML document instance into a DOM tree.</para>
- </callout>
-
- <callout arearefs="programlisting_java_searchimg_pf"
- xml:id="programlisting_java_searchimg_pf_co">
- <para>Create a <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
- factory.</para>
- </callout>
-
- <callout arearefs="programlisting_java_searchimg_newxpath"
- xml:id="programlisting_java_searchimg_newxpath_co">
- <para>Create a <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> query
- instance. This may be used to search for a set of nodes starting
- from a context node.</para>
- </callout>
-
- <callout arearefs="programlisting_java_searchimg_execquery"
- xml:id="programlisting_java_searchimg_execquery_co">
- <para>Using the document's root node as the context node we search
- for <tag class="starttag">img</tag> elements appearing at
- arbitrary positions in our document.</para>
- </callout>
-
- <callout arearefs="programlisting_java_searchimg_loop"
- xml:id="programlisting_java_searchimg_loop_co">
- <para>We iterate over the retrieved list of images.</para>
- </callout>
-
- <callout arearefs="programlisting_java_searchimg_cast"
- xml:id="programlisting_java_searchimg_cast_co">
- <para>Casting to the correct type.</para>
- </callout>
- </calloutlist>
-
- <para>The result is a list of image filename references:</para>
-
- <programlisting language="none">inline.gif one.gif http://www.hdm-stuttgart.de/favicon.ico </programlisting>
-
- <qandaset defaultlabel="qanda" xml:id="quandaentry_CastAlwaysLegal">
- <title>Legal casting?</title>
-
- <qandadiv>
- <qandaentry>
- <question>
- <para>Why is the cast in <coref
- linkend="programlisting_java_searchimg_cast"/> in <xref
- linkend="domFindImages"/> guaranteed to never cause a
- <classname>java.lang.ClassCastException</classname>?</para>
- </question>
-
- <answer>
- <para>The <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
- <code>//img</code> expression is guaranteed to return only
- <tag class="starttag">img</tag> elements. Thus within our
- <xref linkend="glo_Java"/>
- context we are sure to find only
- <classname>org.jdom2.Element</classname> instances.</para>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
-
- <qandaset defaultlabel="qanda" xml:id="exercise_htmlImageVerify">
- <title>Verification of referenced images readability</title>
-
- <qandadiv>
- <qandaentry>
- <question>
- <para>We want to extend the example given in <xref
- linkend="domFindImages"/> by testing the existence and
- checking for readability of referenced images. The following
- HTML document contains <quote>dead</quote> image
- references:</para>
-
- <programlisting language="none"
- xml:id="domCheckImageAccessibility"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+ <caption>
+ <para>This application searches for <tag class="emptytag">img</tag>
+ elements and shows their <code>src</code> attribute value.</para>
+ </caption>
+ </figure>
+
+ <calloutlist>
+ <callout arearefs="programlisting_java_searchimg_parse"
+ xml:id="programlisting_java_searchimg_parse_co">
+ <para>Parse a XHTML document instance into a DOM tree.</para>
+ </callout>
+
+ <callout arearefs="programlisting_java_searchimg_pf"
+ xml:id="programlisting_java_searchimg_pf_co">
+ <para>Create a <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
+ factory.</para>
+ </callout>
+
+ <callout arearefs="programlisting_java_searchimg_newxpath"
+ xml:id="programlisting_java_searchimg_newxpath_co">
+ <para>Create a <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym> query
+ instance. This may be used to search for a set of nodes starting from
+ a context node.</para>
+ </callout>
+
+ <callout arearefs="programlisting_java_searchimg_execquery"
+ xml:id="programlisting_java_searchimg_execquery_co">
+ <para>Using the document's root node as the context node we search for
+ <tag class="starttag">img</tag> elements appearing at arbitrary
+ positions in our document.</para>
+ </callout>
+
+ <callout arearefs="programlisting_java_searchimg_loop"
+ xml:id="programlisting_java_searchimg_loop_co">
+ <para>We iterate over the retrieved list of images.</para>
+ </callout>
+
+ <callout arearefs="programlisting_java_searchimg_cast"
+ xml:id="programlisting_java_searchimg_cast_co">
+ <para>Casting to the correct type.</para>
+ </callout>
+ </calloutlist>
+
+ <para>The result is a list of image filename references:</para>
+
+ <programlisting language="none">inline.gif one.gif http://www.hdm-stuttgart.de/favicon.ico </programlisting>
+
+ <section xml:id="sda1SectCastAlwaysLegal">
+ <title>Legal casting?</title>
+
+ <qandaset defaultlabel="qanda" xml:id="sda1QandaCastAlwaysLegal">
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>Why is the cast in <coref
+ linkend="programlisting_java_searchimg_cast"/> in <xref
+ linkend="domFindImages"/> guaranteed to never cause a
+ <classname>java.lang.ClassCastException</classname>?</para>
+ </question>
+
+ <answer>
+ <para>The <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
+ expression <code>//img</code> is guaranteed to return only <tag
+ class="starttag">img</tag> elements in contrast to e.g.
+ <code>//text()</code>. Thus within our <xref
+ linkend="glo_Java"/> context we are sure to find only
+ <classname>org.jdom2.Element</classname> instances.</para>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+
+ <section xml:id="sda1SectAvoidCast">
+ <title>Avoiding casts in XPath results</title>
+
+ <qandaset defaultlabel="qanda" xml:id="sda1QandaAvoidCast">
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>Casts in XPath expression related queries are just ugly.
+ We may get rid of this problem using Filter instances.</para>
+
+ <para>Re-write <xref linkend="domFindImages"/> avoiding casts
+ completely.</para>
+
+ <tip>
+ <para>Use the <methodname
+ xlink:href="http://www.jdom.org/docs/apidocs/org/jdom2/xpath/XPathFactory.html#compile(java.lang.String,%20org.jdom2.filter.Filter)">compile(...)</methodname>
+ method.</para>
+ </tip>
+ </question>
+
+ <answer>
+ <annotation role="make">
+ <para role="eclipse">Sda1/NoCast</para>
+ </annotation>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+
+ <section xml:id="sda1SectVerifyImgReadable">
+ <title>Verification of referenced images readability</title>
+
+ <qandaset defaultlabel="qanda" xml:id="sda1QandaVerifyImgReadable">
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>We want to extend the example given in <xref
+ linkend="domFindImages"/> by testing the existence and checking
+ for readability of referenced images. The following HTML
+ document contains <quote>dead</quote> image references:</para>
+
+ <programlisting language="none"
+ xml:id="domCheckImageAccessibility"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> ...
<body>
@@ -1078,33 +1098,32 @@ public class DomXpath {
</body>
</html></programlisting>
- <para>Write an application which checks for readability of
- <abbrev
- xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>
- image references to <emphasis>external</emphasis> Servers
- starting either with <code>http://</code> or
- <code>ftp://</code> ignoring other protocol types. Internal
- image references referring to the <quote>current</quote>
- server typically look like <code><img
- src="/images/test.gif"</code>. So in order to distinguish
- these two types of references we may use the XSL built in
- function <link
- xlink:href="http://www.cafeconleche.org/books/bible2/chapters/ch17.html">starts-with()</link>
- testing for the <code>http</code> or <code>ftp</code> protocol
- definition part of an <abbrev
- xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>.
- A possible output for the example being given is:</para>
-
- <programlisting language="none">Received 'sun.awt.image.URLImageSource' from
+ <para>Write an application which checks for readability of
+ <abbrev
+ xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>
+ image references to <emphasis>external</emphasis> Servers
+ starting either with <code>http://</code> or <code>ftp://</code>
+ ignoring other protocol types. Internal image references
+ referring to the <quote>current</quote> server typically look
+ like <code><img src="/images/test.gif"</code>. So in order to
+ distinguish these two types of references we may use the XSL
+ built in function <link
+ xlink:href="http://www.cafeconleche.org/books/bible2/chapters/ch17.html">starts-with()</link>
+ testing for the <code>http</code> or <code>ftp</code> protocol
+ definition part of an <abbrev
+ xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>. A
+ possible output for the example being given is:</para>
+
+ <programlisting language="none">Received 'sun.awt.image.URLImageSource' from
http://www.hdm-stuttgart.de/bilder_navigation/laptop.gif
Unable to open 'http://www.hdm-stuttgart.de/rotfl.gif'</programlisting>
- <para>The following code snippet shows a helpful class method
- to check for both correctness of <abbrev
- xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>'s
- and accessibility of referenced objects:</para>
+ <para>The following code snippet shows a helpful class method to
+ check for both correctness of <abbrev
+ xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>'s
+ and accessibility of referenced objects:</para>
- <programlisting language="none">package dom.xpath;
+ <programlisting language="none">package dom.xpath;
...
public class CheckUrl {
public static void checkReadability(final String urlRef) {
@@ -1127,30 +1146,29 @@ public class CheckUrl {
}
}
}</programlisting>
- </question>
-
- <answer>
- <para>We are interested in the set of images within a given
- HTML document containing an <link
- xlink:href="http://www.w3.org/Addressing">URL</link> reference
- starting either with <code>http://</code> or
- <code>ftp://</code>. This is achieved by the following
- <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
- expression:</para>
-
- <programlisting language="none">//html:img[starts-with(@src, 'http://') or starts-with(@src, 'ftp://')]</programlisting>
-
- <para>The application only needs to pass the corresponding
- <abbrev
- xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>'s
- to the method <link
- xlink:href="domCheckUrlObjectExistence">CheckUrl.checkReadability()</link>.
- The rest of the code is identical to the <link
- linkend="domFindImages">introductory example</link>:</para>
-
- <informalfigure xml:id="solutionFintExtImgRef">
- <programlisting language="none">package dom.xpath;
+ </question>
+
+ <answer>
+ <para>We are interested in the set of images within a given HTML
+ document containing an <link
+ xlink:href="http://www.w3.org/Addressing">URL</link> reference
+ starting either with <code>http://</code> or
+ <code>ftp://</code>. This is achieved by the following <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
+ expression:</para>
+
+ <programlisting language="none">//html:img[starts-with(@src, 'http://') or starts-with(@src, 'ftp://')]</programlisting>
+
+ <para>The application only needs to pass the corresponding
+ <abbrev
+ xlink:href="http://www.ietf.org/rfc/rfc1738.txt">URL</abbrev>'s
+ to the method <link
+ xlink:href="domCheckUrlObjectExistence">CheckUrl.checkReadability()</link>.
+ The rest of the code is identical to the <link
+ linkend="domFindImages">introductory example</link>:</para>
+
+ <informalfigure xml:id="solutionFintExtImgRef">
+ <programlisting language="none">package dom.xpath;
...
public class CheckExtImage {
private final SAXBuilder builder = new SAXBuilder();
@@ -1171,31 +1189,30 @@ public class CheckExtImage {
}
}
}</programlisting>
- </informalfigure>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
- </section>
-
- <section xml:id="domXsl">
- <title><acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> and
- <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev></title>
-
- <para><xref linkend="glo_Java"/>
- based <xref linkend="glo_XML"/>
- applications may use XSL style sheets for processing. A <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> tree may for example
- be transformed into another tree. The package <link
- xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/transform/package-frame.html">javax.xml.transform</link>
- provides interfaces and classes for this purpose. We consider the
- following product catalog example:</para>
-
- <figure xml:id="climbingCatalog">
- <title>A simplified <xref linkend="glo_XML"/> product
- catalog</title>
-
- <programlisting language="none"><catalog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ </informalfigure>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+ </section>
+
+ <section xml:id="domXsl">
+ <title><acronym xlink:href="http://www.w3.org/DOM">DOM</acronym> and
+ <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev></title>
+
+ <para><xref linkend="glo_Java"/> based <xref linkend="glo_XML"/>
+ applications may use XSL style sheets for processing. A <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> tree may for example be
+ transformed into another tree. The package <link
+ xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/transform/package-frame.html">javax.xml.transform</link>
+ provides interfaces and classes for this purpose. We consider the
+ following product catalog example:</para>
+
+ <figure xml:id="climbingCatalog">
+ <title>A simplified <xref linkend="glo_XML"/> product catalog</title>
+
+ <programlisting language="none"><catalog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="catalog.xsd">
<title>Outdoor products</title>
<introduction>
@@ -1219,10 +1236,10 @@ public class CheckExtImage {
</product>
</catalog></programlisting>
- <para>A corresponding schema file <filename>catalog.xsd</filename>
- is straightforward:</para>
+ <para>A corresponding schema file <filename>catalog.xsd</filename> is
+ straightforward:</para>
- <programlisting language="none"><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+ <programlisting language="none"><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" elementFormDefault="qualified"
vc:minVersion="1.0" vc:maxVersion="1.1">
@@ -1267,18 +1284,17 @@ public class CheckExtImage {
</xs:schema>
</programlisting>
- </figure>
+ </figure>
- <para>A <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev>
- style sheet may be used to transform this document into the HTML
- Format:</para>
+ <para>A <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev>
+ style sheet may be used to transform this document into the HTML
+ Format:</para>
- <figure xml:id="catalog2html">
- <title>A <abbrev
- xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> style sheet
- for catalog transformation to HTML.</title>
+ <figure xml:id="catalog2html">
+ <title>A <abbrev xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev>
+ style sheet for catalog transformation to HTML.</title>
- <programlisting language="none"><?xml version="1.0" encoding="utf-8"?>
+ <programlisting language="none"><?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0" xmlns="http://www.w3.org/1999/xhtml">
@@ -1305,21 +1321,20 @@ public class CheckExtImage {
</xsl:if>
</xsl:template>
</xsl:stylesheet></programlisting>
- </figure>
+ </figure>
- <para>As a preparation for <xref linkend="exercise_catalogRdbms"/> we
- now demonstrate the usage of <abbrev
- xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> within a
- <xref linkend="glo_Java"/> application.
- This is done by a <link
- xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/transform/Transformer.html">Transformer</link>
- instance:</para>
+ <para>As a preparation for <xref linkend="exercise_catalogRdbms"/> we now
+ demonstrate the usage of <abbrev
+ xlink:href="http://www.w3.org/Style/XSL">XSL</abbrev> within a <xref
+ linkend="glo_Java"/> application. This is done by a <link
+ xlink:href="http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/transform/Transformer.html">Transformer</link>
+ instance:</para>
- <figure xml:id="xml2xml">
- <title>Transforming an XML document instance to HTML by a XSL style
- sheet.</title>
+ <figure xml:id="xml2xml">
+ <title>Transforming an XML document instance to HTML by a XSL style
+ sheet.</title>
- <programlisting language="none">package dom.xsl;
+ <programlisting language="none">package dom.xsl;
...
public class Xml2Html {
private final SAXBuilder builder = new SAXBuilder();
@@ -1345,15 +1360,15 @@ public class Xml2Html {
}
}</programlisting>
- </figure>
+ </figure>
- <para>A corresponding driver file is needed to invoke a
- transformation:</para>
+ <para>A corresponding driver file is needed to invoke a
+ transformation:</para>
- <figure xml:id="xml2xmlDriver">
- <title>A driver class for the xml2xml transformer.</title>
+ <figure xml:id="xml2xmlDriver">
+ <title>A driver class for the xml2xml transformer.</title>
- <programlisting language="none">package dom.xsl;
+ <programlisting language="none">package dom.xsl;
...
public class Xml2HtmlDriver {
...
@@ -1374,22 +1389,22 @@ public class Xml2HtmlDriver {
}
}
}</programlisting>
- </figure>
+ </figure>
- <qandaset defaultlabel="qanda" xml:id="exercise_catalogRdbms">
- <title>HTML from XML and relational data</title>
+ <qandaset defaultlabel="qanda" xml:id="exercise_catalogRdbms">
+ <title>HTML from XML and relational data</title>
- <qandadiv>
- <qandaentry>
- <question>
- <label>Catalogs and RDBMS</label>
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <label>Catalogs and RDBMS</label>
- <para>We want to extend the transformation being described
- before in <xref linkend="xml2xml"/> by reading price
- information from a RDBMS. Consider the following schema and
- <code>INSERT</code>s:</para>
+ <para>We want to extend the transformation being described before
+ in <xref linkend="xml2xml"/> by reading price information from a
+ RDBMS. Consider the following schema and
+ <code>INSERT</code>s:</para>
- <programlisting language="none">CREATE TABLE Product(
+ <programlisting language="none">CREATE TABLE Product(
orderNo CHAR(10)
,price NUMERIC(10,2)
);
@@ -1397,49 +1412,48 @@ public class Xml2HtmlDriver {
INSERT INTO Product VALUES('x-223', 330.20);
INSERT INTO Product VALUES('w-124', 110.40);</programlisting>
- <para>Adding prices may be implemented the following
- way:</para>
-
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/xml2html.fig"/>
- </imageobject>
- </mediaobject>
-
- <para>You may implement this by following these steps:</para>
-
- <orderedlist>
- <listitem>
- <para>You may reuse class
- <classname>sax.rdbms.RdbmsAccess</classname> from <xref
- linkend="saxRdbms"/>.</para>
- </listitem>
-
- <listitem>
- <para>Use the previous class to modify <xref
- linkend="xml2xml"/> by introducing a new method
- <code>addPrices(final Document catalog)</code> which adds
- prices to the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> tree
- accordingly. The insertion points may be reached by an
- <acronym
- xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
- expression.</para>
- </listitem>
- </orderedlist>
- </question>
-
- <answer>
- <para>The additional functionality on top of <xref
- linkend="xml2xml"/> is represented by a method
- <methodname>dom.xsl.XmlRdbms2Html.addPrices()</methodname>.
- This method modifies the <acronym
- xlink:href="http://www.w3.org/DOM">DOM</acronym> input tree
- prior to applying the XSL. Prices are being inserting based on
- data received from an RDBMS via <trademark
- xlink:href="http://electronics.zibb.com/trademark/jdbc/29545026">JDBC</trademark>:</para>
-
- <programlisting language="none">package dom.xsl;
+ <para>Adding prices may be implemented the following way:</para>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/xml2html.fig"/>
+ </imageobject>
+ </mediaobject>
+
+ <para>You may implement this by following these steps:</para>
+
+ <orderedlist>
+ <listitem>
+ <para>You may reuse class
+ <classname>sax.rdbms.RdbmsAccess</classname> from <xref
+ linkend="saxRdbms"/>.</para>
+ </listitem>
+
+ <listitem>
+ <para>Use the previous class to modify <xref
+ linkend="xml2xml"/> by introducing a new method
+ <code>addPrices(final Document catalog)</code> which adds
+ prices to the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> tree
+ accordingly. The insertion points may be reached by an
+ <acronym
+ xlink:href="http://www.w3.org/TR/xpath">XPath</acronym>
+ expression.</para>
+ </listitem>
+ </orderedlist>
+ </question>
+
+ <answer>
+ <para>The additional functionality on top of <xref
+ linkend="xml2xml"/> is represented by a method
+ <methodname>dom.xsl.XmlRdbms2Html.addPrices()</methodname>. This
+ method modifies the <acronym
+ xlink:href="http://www.w3.org/DOM">DOM</acronym> input tree prior
+ to applying the XSL. Prices are being inserting based on data
+ received from an RDBMS via <trademark
+ xlink:href="http://electronics.zibb.com/trademark/jdbc/29545026">JDBC</trademark>:</para>
+
+ <programlisting language="none">package dom.xsl;
...
public class XmlRdbms2Html {
private final SAXBuilder builder = new SAXBuilder();
@@ -1502,10 +1516,10 @@ public class XmlRdbms2Html {
}
}</programlisting>
- <para>The method <code>addPrices(...)</code> utilizes our
- RDBMS access class:</para>
+ <para>The method <code>addPrices(...)</code> utilizes our RDBMS
+ access class:</para>
- <programlisting language="none">package dom.xsl;
+ <programlisting language="none">package dom.xsl;
...
public class DbAccess {
public void connect(final String jdbcUrl,
@@ -1534,11 +1548,11 @@ public class DbAccess {
...
}</programlisting>
- <para>Of course the connection details should be moved to a
- configuration file.</para>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
- </section>
- </chapter>
+ <para>Of course the connection details should be moved to a
+ configuration file.</para>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+</chapter>
diff --git a/P/Sda1/ImageSearch/pom.xml b/P/Sda1/ImageSearch/pom.xml
index daa8bedda..4e008b574 100644
--- a/P/Sda1/ImageSearch/pom.xml
+++ b/P/Sda1/ImageSearch/pom.xml
@@ -15,23 +15,7 @@
<version>0.8</version>
<packaging>jar</packaging>
- <name>saxerrorhandler</name>
+ <name>Imgsearch</name>
<url>http://www.mi.hdm-stuttgart.de/freedocs</url>
- <dependencies>
-
- <dependency>
- <groupId>org.apache.logging.log4j</groupId>
- <artifactId>log4j-api</artifactId>
- <version>2.1</version>
- </dependency>
-
- <dependency>
- <groupId>org.apache.logging.log4j</groupId>
- <artifactId>log4j-core</artifactId>
- <version>2.1</version>
- </dependency>
-
- </dependencies>
-
</project>
diff --git a/P/Sda1/NoCast/.gitignore b/P/Sda1/NoCast/.gitignore
new file mode 100644
index 000000000..27306f265
--- /dev/null
+++ b/P/Sda1/NoCast/.gitignore
@@ -0,0 +1,5 @@
+A1.log
+/target/
+/.settings/
+.classpath
+.project
diff --git a/P/Sda1/NoCast/pom.xml b/P/Sda1/NoCast/pom.xml
new file mode 100644
index 000000000..2caab7339
--- /dev/null
+++ b/P/Sda1/NoCast/pom.xml
@@ -0,0 +1,37 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <parent>
+ <groupId>de.hdm-stuttgart.mi</groupId>
+ <artifactId>lecturenotes-pom</artifactId>
+ <version>1.0</version>
+
+ <relativePath>../../pom.xml</relativePath>
+ </parent>
+
+ <groupId>de.hdm_stuttgart.mi.sda1</groupId>
+ <artifactId>nocast</artifactId>
+ <version>0.8</version>
+ <packaging>jar</packaging>
+
+ <name>NoCast</name>
+ <url>http://www.mi.hdm-stuttgart.de/freedocs</url>
+
+ <dependencies>
+
+ <dependency>
+ <groupId>org.jdom</groupId>
+ <artifactId>jdom2</artifactId>
+ <version>2.0.6</version>
+ </dependency>
+
+ <dependency>
+ <groupId>jaxen</groupId>
+ <artifactId>jaxen</artifactId>
+ <version>1.1.4</version>
+ </dependency>
+
+ </dependencies>
+
+</project>
diff --git a/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/DomXpath.java b/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/DomXpath.java
new file mode 100644
index 000000000..d5f834618
--- /dev/null
+++ b/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/DomXpath.java
@@ -0,0 +1,44 @@
+package de.hdm_stuttgart.mi.sda1.nocast;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.jdom2.Document;
+import org.jdom2.Element;
+import org.jdom2.JDOMException;
+import org.jdom2.filter.ElementFilter;
+import org.jdom2.input.SAXBuilder;
+import org.jdom2.xpath.XPathExpression;
+import org.jdom2.xpath.XPathFactory;
+
+/**
+ * How to use XPath expressions to search for <img>
+ * elements in XHTML document instances.
+ *
+ */
+public class DomXpath {
+ private final SAXBuilder builder = new SAXBuilder();
+
+ /**
+ *
+ */
+ public DomXpath() {}
+ /**
+ * Read an XHTML document and search for images. The image filenames will be
+ * written to standard out.
+ *
+ * @param xhtmlFilename The XHTML's filename to be examined.
+ * @throws JDOMException General parsing fault
+ * @throws IOException file access problem
+ */
+ public void process(final String xhtmlFilename) throws JDOMException, IOException {
+
+ final Document htmlInput = builder.build(xhtmlFilename);
+ final XPathExpression<Element> xpath = XPathFactory.instance().compile("//img", new ElementFilter());
+ final List<Element> images = xpath.evaluate(htmlInput);
+
+ for (final Element image: images) {
+ System.out.print(image.getAttributeValue("src") + " ");
+ }
+ }
+}
\ No newline at end of file
diff --git a/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/driver/DomXpathDriver.java b/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/driver/DomXpathDriver.java
new file mode 100644
index 000000000..83e4fbd37
--- /dev/null
+++ b/P/Sda1/NoCast/src/main/java/de/hdm_stuttgart/mi/sda1/nocast/driver/DomXpathDriver.java
@@ -0,0 +1,22 @@
+package de.hdm_stuttgart.mi.sda1.nocast.driver;
+
+import de.hdm_stuttgart.mi.sda1.nocast.DomXpath;
+
+/**
+ * Driver to test XPath based searching of <img> elements
+ * within a given HTML document.
+ *
+*/
+public class DomXpathDriver {
+
+ /**
+ * @param argv Unused command arguments
+ * @throws Exception File access problem or corrupt content.
+ */
+ public static void main(String[] argv) throws Exception {
+ final DomXpath ao = new DomXpath();
+ // The following HTML document is being searched
+ // for <img> elements.
+ ao.process("src/main/resources/gallery.html");
+ }
+}
\ No newline at end of file
diff --git a/P/Sda1/NoCast/src/main/resources/gallery.html b/P/Sda1/NoCast/src/main/resources/gallery.html
new file mode 100644
index 000000000..600f3ab6b
--- /dev/null
+++ b/P/Sda1/NoCast/src/main/resources/gallery.html
@@ -0,0 +1,26 @@
+<?xml version="1.0"?>
+<!--
+ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+ -->
+<html>
+ <head>
+ <title>Picture gallery</title>
+ </head>
+ <body>
+ <h1>Picture gallery</h1>
+ <p>Images may appear inline:<img src="inline.gif" alt="none"/></p>
+ <table>
+ <tbody>
+ <tr>
+ <td>Number one:</td>
+ <td><img src="one.gif" alt="none"/></td>
+ </tr>
+ <tr>
+ <td>Number two:</td>
+ <td><img src="http://www.hdm-stuttgart.de/favicon.ico" alt="none"/></td>
+ </tr>
+ </tbody>
+ </table>
+ </body>
+</html>
diff --git a/P/pom.xml b/P/pom.xml
index 1d98ef163..d3194bc73 100644
--- a/P/pom.xml
+++ b/P/pom.xml
@@ -107,6 +107,8 @@
<module>Sda1/catalog2sql</module>
<module>Sda1/catalog2rdbms</module>
+ <module>Sda1/NoCast</module>
+
<module>Sda1/rdbms2catalog</module>
<module>Sda1/xmlstatistics</module>
--
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