serializer.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 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.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
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 *
 * THIS SOFTWARE IS PROVIDED ``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 THE APACHE SOFTWARE FOUNDATION 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
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 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */


package org.jasig.portal.serialize;


import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;

import org.xml.sax.ContentHandler;
import org.xml.sax.DocumentHandler;


/**
 * Interface for a DOM serializer implementation, factory for DOM and SAX
 * serializers, and static methods for serializing DOM documents.
 * <p>
 * To serialize a document using SAX events, create a compatible serializer
 * using <code>makeSAXSerializer</code> and pass it around as a <code>
 * DocumentHandler</code>. If an I/O error occurs while serializing, it will
 * be thrown by <code>DocumentHandler.endDocument()</code>. The SAX serializer
 * may also be used as <code>DTDHandler</code>, <code>DeclHandler</code> and
 * <code>LexicalHandler</code>.
 * <p>
 * To serialize a DOM document or DOM element, create a compatible
 * serializer using <code>makeSerializer</code> and call it's <code>
 * serialize(Document)</code> or <code>serialize(Element)</code> methods.
 * Both methods would produce a full XML document, to serizlie only
 * the portion of the document use <code>OutputFormat.setOmitXMLDeclaration()</code>
 * and specify no document type.
 * <p>
 * The convenience method <code>serialize(Document,Writer,OutputFormat)</code>
 * creates a serializer and calls <code>serizlie(Document)</code> on that
 * serialized.
 * <p>
 * The <code>OutputFormat</code> dictates what underlying serialized is used
 * to serialize the document based on the specified method. If the output
 * format or method are missing, the default is an XML serializer with
 * UTF-8 encoding and now indentation.
 * 
 *
 * @version $Revision: 1.3 $ $Date: 2003/04/08 22:22:06 $
 * @author <a href="mailto:[e-mail]">Assaf Arkin</a>
 * @author <a href="mailto:Scott_Boag/CAM/[e-mail]">Scott Boag</a>
 * @see DocumentHandler
 * @see ContentHandler
 * @see OutputFormat
 * @see DOMSerializer
 */
public interface Serializer
{


    /**
     * Specifies an output stream to which the document should be
     * serialized. This method should not be called while the
     * serializer is in the process of serializing a document.
     */
    public void setOutputByteStream(OutputStream output);
    

    /**
     * Specifies a writer to which the document should be serialized.
     * This method should not be called while the serializer is in
     * the process of serializing a document.
     */
    public void setOutputCharStream( Writer output );


    /**
     * Specifies an output format for this serializer. It the
     * serializer has already been associated with an output format,
     * it will switch to the new format. This method should not be
     * called while the serializer is in the process of serializing
     * a document.
     *
     * @param format The output format to use
     */
    public void setOutputFormat( OutputFormat format );


    /**
     * Return a {@link DocumentHandler} interface into this serializer.
     * If the serializer does not support the {@link DocumentHandler}
     * interface, it should return null.
     */
    public DocumentHandler asDocumentHandler()
        throws IOException;


    /**
     * Return a {@link ContentHandler} interface into this serializer.
     * If the serializer does not support the {@link ContentHandler}
     * interface, it should return null.
     */
    public ContentHandler asContentHandler()
        throws IOException;


    /**
     * Return a {@link DOMSerializer} interface into this serializer.
     * If the serializer does not support the {@link DOMSerializer}
     * interface, it should return null.
     */
    public DOMSerializer asDOMSerializer()
        throws IOException;


}