Apache Commons JXPath

From Java Example Source Code

[edit] Overview Apache Commons JXPath

The org.apache.commons.jxpath package defines a simple interpreter of an expression language called XPath. JXPath applies XPath expressions to graphs of objects of all kinds: JavaBeans, Maps, Servlet contexts, DOM etc, including mixtures thereof.

Consider this example:

    Address address = (Address)JXPathContext.newContext(vendor).
             getValue("locations[address/zipCode='90210']/address");

This XPath expression is equivalent to the following Java code:

    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;
        }
    }

XPath was standardized by W3C and is used in both XSLT and XPointer.

[edit] Apache Commons JXPath Resources

• Web site: http://commons.apache.org/jxpath/
• Download: http://commons.apache.org/downloads/download_jxpath.cgi
• Java API: JXPath API
• Examples: Apache Commons JXPath by exampes
• Tutorial: Users guide
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