/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.xml.internal.stream.buffer;

import com.sun.xml.internal.stream.buffer.sax.SAXBufferCreator;
import javax.xml.transform.sax.SAXResult;
import org.xml.sax.ContentHandler;
import org.xml.sax.ext.LexicalHandler;

/**
 * A JAXP Result implementation that supports the serialization to an
 * {@link MutableXMLStreamBuffer} for use by applications that expect a Result.
 *
 * <p>
 * Reuse of a XMLStreamBufferResult more than once will require that the 
 * MutableXMLStreamBuffer is reset by called
 * {@link #.getXMLStreamBuffer()}.reset(), or by calling 
 * {@link #.setXMLStreamBuffer()} with a new instance of
 * {@link MutableXMLStreamBuffer}.
 *
 * <p>
 * The derivation of XMLStreamBufferResult from SAXResult is an implementation
 * detail.
 *  
 * <p>General applications shall not call the following methods:
 * <ul>
 * <li>setHandler</li>
 * <li>setLexicalHandler</li>
 * <li>setSystemId</li>
 * </ul>
 */
public class XMLStreamBufferResult extends SAXResult {
    protected MutableXMLStreamBuffer _buffer;
    protected SAXBufferCreator _bufferCreator;
    
    /**
     * The default XMLStreamBufferResult constructor.
     *
     * <p>
     * A {@link MutableXMLStreamBuffer} is instantiated and used.
     */
    public XMLStreamBufferResult() {
        setXMLStreamBuffer(new MutableXMLStreamBuffer());
    }
    
    /**
     * XMLStreamBufferResult constructor.
     *
     * @param buffer the {@link MutableXMLStreamBuffer} to use.
     */
    public XMLStreamBufferResult(MutableXMLStreamBuffer buffer) {
        setXMLStreamBuffer(buffer);
    }
    
    /**
     * Get the {@link MutableXMLStreamBuffer} that is used.
     *
     * @return the {@link MutableXMLStreamBuffer}.
     */
    public MutableXMLStreamBuffer getXMLStreamBuffer() {
        return _buffer;
    }    
    
    /**
     * Set the {@link MutableXMLStreamBuffer} to use.
     *
     * @param buffer the {@link MutableXMLStreamBuffer}.
     */
    public void setXMLStreamBuffer(MutableXMLStreamBuffer buffer) {
        if (buffer == null) {
            throw new NullPointerException("buffer cannot be null");
        }
        _buffer = buffer;
        setSystemId(_buffer.getSystemId());
        
        if (_bufferCreator != null) {
            _bufferCreator.setXMLStreamBuffer(_buffer);
        }
    }    

    public ContentHandler getHandler() {
        if (_bufferCreator == null) {
            _bufferCreator = new SAXBufferCreator(_buffer);
            setHandler(_bufferCreator);
        } else if (super.getHandler() == null) {            
            setHandler(_bufferCreator);
        }
        
        return _bufferCreator;        
    }
    
    public LexicalHandler getLexicalHandler() {
        return (LexicalHandler) getHandler();
    }    
}