See:  http://www.sanger.ac.uk/Users/mrp/java/links.java
Date:  1999-03-09
XPointer
------------------------------------------------------------------

/*
 * Adapted from main.java by me. Use at your discretion etc. etc.
 *
 * mrp@sanger.ac.uk                  Matthew Pocock
 */

/*
 * @(#)main.java	1.7 99/02/18
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

import java.util.*;

import java.io.File;
import com.sun.xml.parser.Resolver;
import com.sun.xml.tree.*;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.w3c.dom.*;

// get my XPointer stuff
import mrp.xml.*;

public class links
{
    //
    // Reading and writing an XML document stored in a file.
    //
    public static void main (String argv [])
    {
	InputSource	input;
	XmlDocument	doc;

	if (argv.length != 1) {
	    System.err.println ("Usage: cmd filename");
	    System.exit (1);
	}

	try {
	    // turn the filename into an input source
	    input = Resolver.createInputSource (new File (argv [0]));

	    // turn it into an in-memory object
	    // ... the "false" flag says not to validate
	    doc = XmlDocument.createXmlDocument (input, false);

	    // normalize text representation
	    doc.getDocumentElement ().normalize ();

          // process each element that looks like a link and print stuff out
          Hashtable links = XPointer.processLinks(doc);
          for(Iterator keys = links.keySet().iterator(); keys.hasNext();) {
            Node n = (Node) keys.next();
            System.out.println("Element " + n + "\nrefers to\n");
            NodeList nl = ((XPointer) links.get(n)).follow();
            for(int i = 0; i < nl.getLength(); i++)
              System.out.println(i + "\t" + nl.item(i));
          }

	    // prettyprint
	    doc.write (System.out);

	} catch (SAXParseException err) {
	    System.out.println ("** Parsing error" 
		+ ", line " + err.getLineNumber ()
		+ ", uri " + err.getSystemId ());
	    System.out.println("   " + err.getMessage ());
	    // print stack trace as below

	} catch (SAXException e) {
	    Exception	x = e.getException ();

	    ((x == null) ? e : x).printStackTrace ();

	} catch (Throwable t) {
	    t.printStackTrace ();
	}

	System.exit (0);
    }
}