/************************************************************************ * * $Id: TextDocumentMessageElement.java,v 1.5 2005/08/08 19:59:06 bondolo Exp $ * * Copyright (c) 2001 Sun Microsystems, Inc.  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 *       Sun Microsystems, Inc. for Project JXTA." *    Alternately, this acknowledgment may appear in the software itself, *    if and wherever such third-party acknowledgments normally appear. * * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" *    must not be used to endorse or promote products derived from this *    software without prior written permission. For written *    permission, please contact Project JXTA at http://www.jxta.org. * * 5. Products derived from this software may not be called "JXTA", *    nor may "JXTA" appear in their name, without prior written *    permission of Sun. * * 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 SUN MICROSYSTEMS 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. * * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of Project JXTA.  For more * information on Project JXTA, please see * <http://www.jxta.org/>. * * This license is based on the BSD license adopted by the Apache Foundation. *********************************************************************************/package net.jxta.endpoint;import java.io.ByteArrayInputStream;import java.io.InputStream;import java.io.OutputStream;import java.io.Reader;import java.io.Writer;import java.lang.ref.SoftReference;import java.io.UnsupportedEncodingException;import java.io.IOException;import org.apache.log4j.Level;import org.apache.log4j.Logger;import net.jxta.document.MimeMediaType;import net.jxta.document.TextDocument;/** *  A Message Element using JXTA TextDocument for the element data. * **/public class TextDocumentMessageElement extends TextMessageElement {        /**     *  Log4J Logger     **/    private static final Logger LOG = Logger.getLogger( TextDocumentMessageElement.class.getName() );        /**     *  The data for this element.     **/    protected TextDocument doc;        /**     *  Create a new Message Element from the provided Document.     *     *  @param name Name of the Element. May be the empty string ("") or null if     *    the Element is not named.     *  @param doc A Document containing the contents of this element.     *  @param sig optional message digest/digital signature elemnent. If     *    no signature is to be specified, pass null.     **/    public TextDocumentMessageElement(String name, TextDocument doc, MessageElement sig) {        super( name, doc.getMimeType(), sig );                this.doc = doc;    }        /**     *  {@inheritDoc}     **/    public boolean equals( Object target ) {        if( this == target ) {            return true;        }                if( target instanceof MessageElement ) {            if( !super.equals(target) )                return false;                        if ( target instanceof TextMessageElement) {                // have to do a slow char by char comparison. Still better than the stream since it saves encoding.                // XXX 20020615 bondolo@jxta.org the performance of this could be much improved.                                TextMessageElement likeMe = (TextMessageElement) target;                                try {                    Reader myReader = getReader();                    Reader itsReader = likeMe.getReader();                                        int mine;                    int its;                    do {                        mine = myReader.read();                        its = itsReader.read();                                                if( mine != its )                            return false;       // content didn't match                                            } while( (-1 != mine) && (-1 != its) );                                        return ( (-1 == mine) && (-1 == its) ); // end at the same time?                } catch( IOException fatal ) {                    throw new IllegalStateException( "MessageElements could not be compared." + fatal );                }            } else {                // have to do a slow stream comparison.                // XXX 20020615 bondolo@jxta.org the performance of this could be much improved.                                MessageElement likeMe = (MessageElement) target;                                try {                    InputStream myStream = getStream();                    InputStream itsStream = likeMe.getStream();                                        int mine;                    int its;                    do {                        mine = myStream.read();                        its = itsStream.read();                                                if( mine != its )                            return false;       // content didn't match                                            } while( (-1 != mine) && (-1 != its) );                                        return ( (-1 == mine) && (-1 == its) ); // end at the same time?                } catch( IOException fatal ) {                    throw new IllegalStateException( "MessageElements could not be compared." + fatal );                }            }        }                return false; // not a new message element    }        /**     *  {@inheritDoc}     **/    public int hashCode() {        int result = super.hashCode() * 6037 + // a prime        toString().hashCode();                return result;    }        /**     *  {@inheritDoc}     **/    public synchronized String toString() {        String result = null;                if( null != cachedToString ) {            result = (String) cachedToString.get();                        if (null != result)                return result;        }                if (LOG.isEnabledFor(Level.DEBUG)){            LOG.debug( "creating toString of " + getClass().getName() + "@" + super.hashCode() );        }                result = doc.toString();        cachedToString = new SoftReference( result );        return result;    }        /**     * {@inheritDoc}     **/    public MimeMediaType getMimeType() {        return doc.getMimeType();    }        /**     * {@inheritDoc}     **/    public String getFileExtension() {        return doc.getFileExtension();    }        /**     *  {@inheritDoc}     **/    public InputStream getStream() throws IOException {        byte [] sending = getBytes(false);        return new ByteArrayInputStream(sending);    }        /**     *  {@inheritDoc}     **/    public void sendToStream( OutputStream sendTo ) throws IOException {        byte [] sending = getBytes(false);                sendTo.write( sending, 0, sending.length );    }        /**     *  {@inheritDoc}     **/    public Reader getReader() throws IOException {                return doc.getReader( );    }        /**     *  {@inheritDoc}     **/    public void sendToWriter( Writer sendTo ) throws IOException {        doc.sendToWriter( sendTo );    }        /**     *  {@inheritDoc}     **/    public byte[] getBytes( boolean copy ) {        byte [] result = null;                if( null != cachedGetBytes ) {            result = (byte []) cachedGetBytes.get();                        if (null != result)                if ( copy ) {                    byte [] theCopy = new byte[ result.length ];                                        System.arraycopy( theCopy, 0, result, 0, result.length );                } else {                    return result;                }        }                if (LOG.isEnabledFor(Level.DEBUG)){            LOG.debug( "creating getBytes of " + getClass().getName() + '@' + Integer.toHexString(hashCode())  );        }                String charset = type.getParameter( "charset" );                if( null == charset )            result = toString().getBytes( );        else {            try {                result = toString().getBytes( charset );            } catch( UnsupportedEncodingException caught ) {                if (LOG.isEnabledFor(Level.WARN)) {                    LOG.warn( "MessageElement Data could not be generated", caught );                }                throw new IllegalStateException( "MessageElement Data could not be generated due to " + caught.getMessage() );            }        }                // if this is supposed to be a shared buffer then we can cache it.        if( !copy ) {            cachedGetBytes = new SoftReference( result );        }                return result;    }        /**     *  {@inheritDoc}     **/    public long getCharLength() {        return toString().length();    }        /**     *  {@inheritDoc}     **/    public char[] getChars( boolean copy ) {        char [] result = null;                if( null != cachedGetChars ) {            result = (char []) cachedGetChars.get();                        if (null != result)                if ( copy ) {                    char [] theCopy = new char[ result.length ];                                        System.arraycopy( theCopy, 0, result, 0, result.length );                } else {                    return result;                }        }                if (LOG.isEnabledFor(Level.DEBUG)){            LOG.debug( "creating getChars of " + getClass().getName() + '@' + Integer.toHexString(hashCode())  );        }                String asString = toString();                result = asString.toCharArray();                // if this is supposed to be a shared buffer then we can cache it.        if( !copy ) {            cachedGetChars = new SoftReference( result );        }                return result;    }}