/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
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 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 1999, 2000 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.exolab.castor.xml.util;

import java.util.Stack;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.xml.sax.AttributeList;
import org.xml.sax.HandlerBase;

/**
 * A class for converting a SAX events to DOM nodes
 *
 * @author <a href="mailto:andrew.fawcett@coda.com">Andrew Fawcett</a>
 */
public class SAX2DOMHandler extends HandlerBase {
    private Node _document;
    private Stack _parents = new Stack();

    public SAX2DOMHandler(Node node) {
        _document = node;
    }

    public void startElement(final String name, final AttributeList attributes) {
        Node parent = _parents.size()>0 ? (Node) _parents.peek() : _document;
        final Document document;
        if (parent instanceof Document) {
            document = (Document) parent;
        } else {
            document = parent.getOwnerDocument();
        }

        Element element = document.createElement(name);
        int length = attributes.getLength();
        for (int i = 0; i < length; i++) {
            element.setAttribute(attributes.getName(i), attributes.getValue(i));
        }
        parent.appendChild(element);
        _parents.push(element);
    }

    public void characters(final char[] chars, final int offset, final int length) {
        String data = new String(chars, offset, length);
        Node parent = (_parents.size() > 0) ? (Node) _parents.peek() : _document;
        Node last = parent.getLastChild();
        if ((last != null) && (last.getNodeType() == Node.TEXT_NODE)) {
            ((Text)last).appendData(data);
        } else {
            Text text = parent.getOwnerDocument().createTextNode(data);
            parent.appendChild(text);
        }
    }

    public void endElement(final String name) {
        _parents.pop();
    }

}