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The Commons JXPath index.xml source code
<?xml version="1.0"?>
<!--
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The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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limitations under the License.
-->
<document>
<properties>
<title>JXPath Home
<author email="dev@commons.apache.org">Commons Documentation Team
<author email="dmitri@apache.org">Dmitri Plotnikov
<revision>$Id: index.xml 561417 2007-07-31 18:13:25Z niallp $
</properties>
<body>
<section name="The JXPath Component">
<p>
The <code>org.apache.commons.jxpath package defines a simple
interpreter of an expression language called XPath. JXPath applies <em>XPath
expressions to graphs of objects of all kinds: JavaBeans, Maps, Servlet contexts, DOM etc,
including mixtures thereof.
</p>
<p>
Consider this example:
</p>
<blockquote>
Address address = (Address)JXPathContext.newContext(vendor).
getValue("locations[address/zipCode='90210']/address");
</pre>
<p>
This XPath expression is equivalent to the following Java code:
</p>
<blockquote>
Address address = null;
Collection locations = vendor.getLocations();
Iterator it = locations.iterator();
while (it.hasNext()){
Location location = (Location)it.next();
String zipCode = location.getAddress().getZipCode();
if (zipCode.equals("90210")){
address = location.getAddress();
break;
}
}
</pre>
<p>
XPath was standardized by W3C and is used in both XSLT and XPointer.
</p>
<p>
If you want to find out more about XPath, a good place to start
is an excellent XPath Tutorial by <a href="http://www.w3schools.com/xpath">W3Schools
</p>
<p>
The official definition of XPath by W3C can be found at
<a href="http://www.w3.org/TR/xpath">XML Path Language (XPath) Version 1.0
</p>
<p>
Primary applications of JXPath are in scripting: JSP and similar template/script based technologies.
However, programmers who prefer XML-flavored APIs, should consider JXPath as
an alternative to other expression languages as well. JXPath is a must-have tool
for those who work with mixtures of Java objects and XML and need to frequently
traverse through graphs of those.
</p>
<p>
JXPath documentation currently contains:
<ul>
<li>User's Guide
<li>JavaDoc API Documentation
<!-- JXPath Design, which is a document
primarily intended for those who are interested in extending JXPath.
It could also be quite useful if you are debugging a tough problem.
</li>
-->
</ul>
</p>
</section>
<section name="Releases">
<p>See the JXPath Downloads
page for current/previous releases.
</p>
</section>
</body>
</document>
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