/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.cocoon.components.sax;

import org.apache.cocoon.xml.AbstractSAXFragment;
import org.apache.cocoon.xml.EmbeddedXMLPipe;
import org.apache.cocoon.xml.XMLConsumer;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 * An XMLByteStream wrapped by an XMLFragment implementation. This allows to
 * store SAX events and insert them in an XSP result using &lt;xsp:expr&gt;.
 *
 * @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
 * @version CVS $Id: XMLByteStreamFragment.java,v 1.2 2004/03/05 13:02:50 bdelacretaz Exp $
 */

public class XMLByteStreamFragment extends AbstractSAXFragment {

    /** The XML byte stream */
    private Object xmlBytes;

    /**
     * Creates a new <code>XMLByteStreamFragment</code> defined by the given
     * XML byte stream.
     *
     * @param bytes the XML byte stream representing the document fragment
     */
    public XMLByteStreamFragment(Object bytes) {
        xmlBytes = bytes;
    }

    /**
     * Output the fragment. If the fragment is a document, start/endDocument
     * events are discarded.
     */
    public void toSAX(ContentHandler ch)
      throws SAXException {

        // Stream bytes and discard start/endDocument
        XMLByteStreamInterpreter interp = new XMLByteStreamInterpreter();
        EmbeddedXMLPipe pipe = new EmbeddedXMLPipe(ch);

        // If ch is an XMLConsumer, set it as such so that XML comments are
        // also deserialized.
        if (ch instanceof XMLConsumer)
            pipe.setConsumer((XMLConsumer) ch);

        interp.setContentHandler(pipe);

        interp.deserialize(xmlBytes);
    }
}