/*

 * 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.

 *

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package com.sun.xml.internal.stream.buffer;

import com.sun.xml.internal.stream.buffer.sax.SAXBufferProcessor;

import java.io.ByteArrayInputStream;

import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

/**

 * A JAXP Source implementation that supports the parsing

 * of {@link XMLStreamBuffer} for use by applications that expect a Source.

 *

 * <p>

 * The derivation of XMLStreamBufferSource from SAXSource is an implementation

 * detail.

 *

 * <p>Applications shall obey the following restrictions:

 * <ul>

 * <li>The setXMLReader and setInputSource shall not be called.</li>

 * <li>The XMLReader object obtained by the getXMLReader method shall

 *     be used only for parsing the InputSource object returned by

 *     the getInputSource method.</li>

 * <li>The InputSource object obtained by the getInputSource method shall

 *     be used only for being parsed by the XMLReader object returned by

 *     the getXMLReader method.</li>

 * </ul>

 */

public class XMLStreamBufferSource extends SAXSource {

    protected XMLStreamBuffer _buffer;

    protected SAXBufferProcessor _bufferProcessor;

    /**

     * XMLStreamBufferSource constructor.

     *

     * @param buffer the {@link XMLStreamBuffer} to use.

     */

    public XMLStreamBufferSource(XMLStreamBuffer buffer) {

        super(new InputSource(

                new ByteArrayInputStream(new byte[0])));

        setXMLStreamBuffer(buffer);

    }

    /**

     * Get the {@link XMLStreamBuffer} that is used.

     *

     * @return the {@link XMLStreamBuffer}.

     */

    public XMLStreamBuffer getXMLStreamBuffer() {

        return _buffer;

    }

    /**

     * Set the {@link XMLStreamBuffer} to use.

     *

     * @param buffer the {@link XMLStreamBuffer}.

     */

    public void setXMLStreamBuffer(XMLStreamBuffer buffer) {

        if (buffer == null) {

            throw new NullPointerException("buffer cannot be null");

        }

        _buffer = buffer;

        if (_bufferProcessor != null) {

            _bufferProcessor.setBuffer(_buffer,false);

        }

    }

    public XMLReader getXMLReader() {

        if (_bufferProcessor == null) {

            _bufferProcessor = new SAXBufferProcessor(_buffer,false);

            setXMLReader(_bufferProcessor);

        } else if (super.getXMLReader() == null) {

            setXMLReader(_bufferProcessor);

        }

        return _bufferProcessor;

    }

}