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STOMP-JMS is a JMS implementation using STOMP as the wire protocol
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/**
 * Copyright (C) 2010-2011, FuseSource Corp.  All rights reserved.
 *
 *     http://fusesource.com
 *
 * The software in this package is published under the terms of the
 * CDDL license a copy of which has been included with this distribution
 * in the license.txt file.
 */

package org.fusesource.stomp.jms.message;

import org.fusesource.hawtbuf.Buffer;
import org.fusesource.stomp.jms.util.StompTranslator;

import javax.jms.JMSException;
import javax.jms.ObjectMessage;
import java.io.Serializable;

/**
 * An ObjectMessage object is used to send a message that contains
 * a serializable object in the Java programming language ("Java object"). It
 * inherits from the Message interface and adds a body containing a
 * single reference to an object. Only Serializable Java objects
 * can be used.
 * 
 * 

 * If a collection of Java objects must be sent, one of the
 * Collection classes provided since JDK 1.2 can be used.
 * 

 * 

 * When a client receives an ObjectMessage, it is in read-only
 * mode. If a client attempts to write to the message at this point, a
 * MessageNotWriteableException is thrown. If
 * clearBody is called, the message can now be both read from and
 * written to.
 *
 * @openwire:marshaller code="26"
 * @see javax.jms.Session#createObjectMessage()
 * @see javax.jms.Session#createObjectMessage(Serializable)
 * @see javax.jms.BytesMessage
 * @see javax.jms.MapMessage
 * @see javax.jms.Message
 * @see javax.jms.StreamMessage
 * @see javax.jms.TextMessage
 */
public class StompJmsObjectMessage extends StompJmsMessage implements ObjectMessage {
    protected transient Serializable object;

    public JmsMsgType getMsgType() {
        return JmsMsgType.OBJECT;
    }

    public StompJmsMessage copy() throws JMSException {
        StompJmsObjectMessage other = new StompJmsObjectMessage();
        other.copy(this);
        return other;
    }

    private void copy(StompJmsObjectMessage other) throws JMSException {
        other.storeContent();
        super.copy(other);
        this.object = null;
    }

    public void storeContent() throws JMSException {
        Buffer buffer = getContent();
        if (buffer == null && object != null) {
            setContent(StompTranslator.writeBufferFromObject(object));
        }
    }

    /**
     * Clears out the message body. Clearing a message's body does not clear its
     * header values or property entries.
     * 

     * 
     * If this message body was read-only, calling this method leaves the
     * message body in the same state as an empty body in a newly created
     * message.
     *
     * @throws JMSException if the JMS provider fails to clear the message body due to
     *                      some internal error.
     */

    public void clearBody() throws JMSException {
        super.clearBody();
        this.object = null;
    }

    /**
     * Sets the serializable object containing this message's data. It is
     * important to note that an ObjectMessage contains a snapshot
     * of the object at the time setObject() is called; subsequent
     * modifications of the object will have no effect on the
     * ObjectMessage body.
     *
     * @param newObject the message's data
     * @throws JMSException if the JMS provider fails to set the object due to some
     *                      internal error.
     * @throws javax.jms.MessageFormatException
     *                      if object serialization fails.
     * @throws javax.jms.MessageNotWriteableException
     *                      if the message is in read-only mode.
     */

    public void setObject(Serializable newObject) throws JMSException {
        checkReadOnlyBody();
        this.object = newObject;
        setContent(null);
        storeContent();
    }

    /**
     * Gets the serializable object containing this message's data. The default
     * value is null.
     *
     * @return the serializable object containing this message's data
     * @throws JMSException
     */
    public Serializable getObject() throws JMSException {
        Buffer buffer = getContent();
        if (this.object == null && buffer != null) {
            this.object = (Serializable) StompTranslator.readObjectFromBuffer(buffer);
        }
        return this.object;
    }


    public String toString() {
        try {
            getObject();
        } catch (JMSException e) {
        }
        return super.toString();
    }
}