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Distribution release V1.4 - aboutEachPrefix added, namespace management
improved.

/**
 * A simple Element class for storing the element name, attributes
 * and children.
 *
 * $Log: Element.java,v $
 * Revision 1.7  1998/09/08 15:54:01  jsaarela
 * Distribution release V1.4 - aboutEachPrefix added, namespace management
 * improved.
 *
 * Revision 1.6  1998/08/28 10:03:15  jsaarela
 * Distribution release 1.3 on 28-Aug-98.
 *
 * Revision 1.5  1998/08/12 07:54:55  jsaarela
 * Namespace management now corresponds with the W3C Working
 * Draft dated 2-Aug-98.
 *
 * Revision 1.4  1998/07/30 13:39:32  jsaarela
 * multiple internal references fixed,
 * properties without children fixed.
 *
 * Revision 1.3  1998/07/27 12:20:54  jsaarela
 * 1st distribution version logged in.
 *
 *
 * @author Janne Saarela
 */
package org.w3c.rdf;

import java.util.*;
import java.io.*;
import org.xml.sax.AttributeList;
import org.xml.sax.SAXException;

public class Element
{
    private String	m_sName = null;
    private Hashtable	m_attributes = new Hashtable();
    private Vector	m_children = new Vector();
    private String	m_sID = null;
    private String	m_sBagID = null;
    private Hashtable	m_nodes = new Hashtable ();
    private Vector	m_vTargets = new Vector ();
    private boolean	m_bDone = false;

    public Element (String sName, AttributeList al) throws SAXException {
	m_sName = sName;

	if (al != null) {
	    int iLength = al.getLength ();
	    if (al == null) {
		// System.out.println("[Attributes not available]");
	    } else {
		for (int x = 0; x < iLength; x++) {
		    String aName = al.getName (x);
		    String aValue = al.getValue (x);

		    m_attributes.put (aName, aValue);
		}
	    }
	}
    }

    public String name() {
	return m_sName;
    }

    public void addChild (Element e) {
	m_children.addElement (e);
    }

    public Enumeration children () {
	return m_children.elements();
    }

    public Enumeration attributes () {
	return m_attributes.keys();
    }

    public void addAttribute (String sName, String sValue) {
	if (sName == null ||
	    sValue == null)
	    return;
	m_attributes.put (sName, sValue);
    }

    public void removeAttribute (String sName) {
	m_attributes.remove (sName);
    }

    public String getAttribute (String sName) {
	return (String)m_attributes.get (sName);
    }

    public String getAttribute (String sNamespace, String sName) {
	return (String)m_attributes.get (sNamespace+sName);
    }

    public void addTarget (Element e) {
	m_vTargets.addElement (e);
    }

    public Enumeration targets () {
	return m_vTargets.elements();
    }

    public Element target () {
	if (m_vTargets.size() == 0)
	    return null;
	else
	    return (Element)m_vTargets.elementAt(0);
    }

    public void ID (String sID) {
	m_sID = sID;
    }

    public String ID () {
	return m_sID;
    }

    public void bagID (String sBagID) {
	m_sBagID = sBagID;
    }

    public String bagID () {
	return m_sBagID;
    }

    public void linearize (int indent, PrintStream ps) {
	for (int x = 0; x < indent; x++) {
	    ps.print (" ");
	}
	System.out.println ("Element "+name());
	Enumeration e = children();
	while (e.hasMoreElements()) {
	    Element ele = (Element)e.nextElement();
	    ele.linearize (indent + 2, ps);
	}
    }

    public boolean done () {
	return m_bDone;
    }

    public void done (boolean b) {
	m_bDone = b;
    }
}