problem in getting xpath of each node.

[Aditi Gandy]

I would like to get xpath of each element in xml document.
I have written the code, but the last element's number is
getting incremented where i want that to start from [0].

Can anyone please help me?


My code as follows:
book.xml

<?xml version = "1.0" encoding= "ISO-8859-1" standalone ="no"?>
<book>
	<person>
		  <first>Kiran</first>
		  <last>Pai</last>
		  <age>22</age>
	</person>
	<person>
		  <first>Bill</first>
		  <last>Gates</last>
		  <age>46</age>
	</person>
	<person>
		  <first>Steve</first>
		  <last>Jobs</last>
		  <age>40</age>
	</person>
</book>

my java program is:

import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.Stack;
import javax.xml.parsers.*;

import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;

/**
 * SAX handler that creates and prints XPath expressions for each element encountered.
 *
 * The algorithm is not infallible, if elements appear on different levels in the hierarchy.
 * Something like the following is an example:
 *
 * for above book.xml, my program will report
 *
 * //book[0]
//book[0]/person[0]
//book[0]/person[0]/first[0]---> This segment is working fine.
//book[0]/person[0]/last[0]
//book[0]/person[0]/last[0]/name[0]
//book[0]/person[0]/age[0]
//book[0]/person[1]
//book[0]/person[1]/first[1]->(this is wrong: should be //book[0]/person[1]/first[0])
//book[0]/person[1]/last[0]
//book[0]/person[1]/age[0]
//book[0]/person[2]
//book[0]/person[2]/first[2]->   (this is wrong: should be //book[0]/person[2]/first[0])
//book[0]/person[2]/last[0]
//book[0]/person[2]/age[0]
   
 *
 * It also ignores namespaces, and thus treats <foo:elemA> the same as <bar:elemA>.
 */

public class SaxCreateXpath extends DefaultHandler {

    // map of all encountered tags and their running count
    private Map<String, Integer> tagCount;
    // keep track of the succession of elements
    private Stack<String> tags;

    // set to the tag name of the recently closed tag
    String lastClosedTag;

    /**
     * Construct the XPath expression
     */
    private String getCurrentXPath() {
        String str = "//";
        boolean first = true;
        for (String tag : tags) {
            if (first){
                str = str + tag;
           // first = false;
            }
            else
                str = str + "/" + tag;
            str += "["+tagCount.get(tag)+"]";
            first = false;
        }
        return str;
    }

    @Override
    public void startDocument() throws SAXException {
        tags = new Stack();
        tagCount = new HashMap<String, Integer>();
    }

    @Override
    public void startElement (String namespaceURI, String localName, String qName, Attributes atts)
        throws SAXException
    {
        boolean isRepeatElement = false;

        if (tagCount.get(localName) == null) {
            tagCount.put(localName, 0);
        } else {
            
        	
        	tagCount.put(localName, 1 + tagCount.get(localName));
        	
        }

        if (lastClosedTag != null) {

        	// an element was recently closed ...
            if (lastClosedTag.equals(localName)) {
                // ... and it's the same as the current one
                isRepeatElement = true;
               
            } else {
                // ... but it's different from the current one, so discard it
            	 tags.pop();
            	 tagCount.put(localName, 0);
             //   tagCount.put(localName, 1 - tagCount.get(lastClosedTag));
            }
        }

        // if it's not the same element, add the new element and zero count to list
        if (! isRepeatElement) {
            tags.push(localName);
        }

        System.out.println(getCurrentXPath());
        lastClosedTag = null;
    }

    @Override
    public void endElement (String uri, String localName, String qName) throws SAXException {
        // if two tags are closed in succession (without an intermediate opening tag),
        // then the information about the deeper nested one is discarded
        if (lastClosedTag != null) {
            tags.pop();
           }
        lastClosedTag = localName;
        
    }

    public static void main (String[] args) throws Exception {
        /*if (args.length < 1) {
            System.err.println("Usage: SAXCreateXPath <file.xml>");
            System.exit(1);
        }*/

        // Create a JAXP SAXParserFactory and configure it
        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setNamespaceAware(true);
        spf.setValidating(false);

        // Create a JAXP SAXParser
        SAXParser saxParser = spf.newSAXParser();

        // Get the encapsulated SAX XMLReader
        XMLReader xmlReader = saxParser.getXMLReader();

        // Set the ContentHandler of the XMLReader
        xmlReader.setContentHandler(new SaxCreateXpath());

        //String filename = "menuItems1.xml";
        String filename = "book.xml";
        String path = new File(filename).getAbsolutePath();
        if (File.separatorChar != '/') {
            path = path.replace(File.separatorChar, '/');
            System.out.println("path="+path);
        }
        if (!path.startsWith("/")) {
            path = "/" + path;
        }

        // Tell the XMLReader to parse the XML document
        xmlReader.parse("file:"+path);
    }
}

I need to read xml data and put it on the browser. I thought frist i will get xpath of all the elements and get its value calling xpath from my another java program.

Is there any better way to do it ? please suggest me?!

Please help