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Re: XPath and Java DOM APIs

• To: "Dare Obasanjo" <kpako@y...>, <xml-dev@l...>
• Subject: Re: XPath and Java DOM APIs
• From: "Steve Muench" <Steve.Muench@o...>
• Date: Mon, 29 Jul 2002 19:15:40 -0700
• References: <20020728055012.36555.qmail@w...>

Dare,

The Oracle XML Parser for Java supports a selectNodes(), selectSingleNode(),
and value() methods that support XPath 1.0

http://otn.oracle.com/tech/xml/xdk_java/content.html

The following program should answer your questions:

import java.io.*;
import oracle.xml.parser.v2.*;
import org.w3c.dom.*;
public class Test {
  private static final String DOC =
  "<A xmlns:glop='http://blah'>"+
  "<C xmlns='http://blah'>abc</C>"+
  "<glop:C>xyz</glop:C>"+
  "<glop:C xmlns:glop='http://example.com'>123</glop:C>"+
  "<C>456</C><B></B></A>";
  public static void main(String[] args) throws Throwable {
    DOMParser d = new DOMParser();
    d.parse( new StringReader(DOC));
    XMLDocument doc = d.getDocument();
    doc.print(System.out);
    NSResolver ns = new myResolver();
    NodeList nl = doc.selectNodes("//p:C", ns);
    System.out.println("Found " + nl.getLength() + " Elements...");
    for (int i = 0, c = nl.getLength(); i < c; i++) {
      Element e = (Element)nl.item(i);
      System.out.println(e.getNamespaceURI()+", "+e.getNodeName());
    }    nl = doc.selectNodes("//*[local-name()='C' and local-name() != name()]", ns);
    System.out.println("Found " + nl.getLength() + " Elements...");
    for (int i = 0, c = nl.getLength(); i < c; i++) {
      Element e = (Element)nl.item(i);
      System.out.println(e.getNodeName());
    }
  }

 static class myResolver implements NSResolver {
     public String resolveNamespacePrefix(String f) {
       if (f.equals("p")) return "http://blah";
       return null;
     }
  }
}

The output is:

Found 2 Elements...
http://blah, C
http://blah, glop:C

Found 2 Elements...
glop:C
glop:C

__________________________________________________________________
Steve Muench - Developer, Product Mgr, Java/XML Evangelist, Author
Simplify J2EE and EJB Development with BC4J
http://otn.oracle.com/products/jdev/htdocs/j2ee_bc4j.html
Building Oracle XML Apps, www.oreilly.com/catalog/orxmlapp
----- Original Message -----
From: "Dare Obasanjo" <kpako@y...>
To: <xml-dev@l...>
Sent: Saturday, July 27, 2002 10:50 PM
Subject:  XPath and Java DOM APIs


| A friend of mine told me that he couldn't find a Java
| DOM API that supported XPath which could successfully
| return
|
| a.) All the C elements from the http://blah namespace
|
| b.) All the C elements in documents that have a
| namespace name.
|
| from the XML document below.
|
| <?xml version="1.0" ?>
|  <A xmlns:glop="http://blah">
|   <C xmlns="http://blah">abc</C>
|   <glop:C>xyz</glop:C>
|   <glop:C xmlns:glop="http://example.com">123</C>
|   <C>456</C>
|   <B>
|   </B>
|  </A>
|
| I doubt that this is the case but couldn't contradict
| his claims after doing a few cursory searches on
| Google.
|
| Can anyone confirm or deny this and provide sample
| code if it is the latter?
|
| Thanks.
|
| PS: I think his only caveat is that it uses Java 1.3
| not Java 1.4.
|
| =====
| THINGS TO DO IF I BECOME AN EVIL OVERLORD #79
| If my doomsday device happens to come with a reverse switch, as soon as it has been employed it will be melted down and made into
limited-edition commemorative coins.
|
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• References:
  • XPath and Java DOM APIs
    • From: Dare Obasanjo <kpako@y...>

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