streammessagehandler.java

OpenJMS是一个开源的Java Message Service API 1.0.2 规范的实现,它包含有以下特性： *. 它既支持点到点（point-to-point）（PTP）模型和发布/订

/**
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 *
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 *    copy of this document.
 *
 * 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 name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Exoffice Technologies.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Exoffice Technologies. Exolab is a registered
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 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``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
 * EXOFFICE TECHNOLOGIES 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,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2005 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: StreamMessageHandler.java,v 1.2 2005/10/20 14:07:03 tanderson Exp $
 */
package org.exolab.jms.tools.migration.proxy;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageEOFException;
import javax.jms.StreamMessage;

import org.exolab.jms.message.StreamMessageImpl;
import org.exolab.jms.persistence.PersistenceException;


/**
 * Handler for messages of type <code>javax.jms.StreamMessage</code>.
 *
 * @author <a href="mailto:[e-mail]">Tim Anderson</a>
 * @version $Revision: 1.2 $ $Date: 2005/10/20 14:07:03 $
 */
class StreamMessageHandler extends AbstractMessageHandler {

    /**
     * Construct a new <code>StreamMessageHandler</code>.
     *
     * @param destinations the destination store
     * @param connection   the database connection
     */
    public StreamMessageHandler(DestinationStore destinations,
                                 Connection connection) {
        super(destinations, connection);
    }

    /**
     * Returns the type of message that this handler supports.
     *
     * @return the type of message
     */
    protected String getType() {
        return "StreamMessage";
    }

    /**
     * Create a new message.
     *
     * @return a new message
     * @throws JMSException for any JMS error
     */
    protected Message newMessage() throws JMSException {
        return new StreamMessageImpl();
    }

    /**
     * Populate the message body.
     *
     * @param body    the message body
     * @param message the message to populate
     * @throws JMSException         for any JMS error
     * @throws PersistenceException for any persistence error
     */
    protected void setBody(Object body, Message message) throws JMSException,
            PersistenceException {
        if (body == null) {
            throw new JMSException(
                    "Expected non-null body for StreamMessage "
                    + "with JMSMessageID=" + message.getJMSMessageID());
        }
        if (!(body instanceof List)) {
            throw new JMSException(
                    "Expected List body for StreamMessage with JMSMessageID="
                    + message.getJMSMessageID()
                    + " but got type " + body.getClass().getName());
        }
        StreamMessage msg = (StreamMessage) message;
        List list = (List) body;
        for (Iterator i = list.iterator(); i.hasNext();) {
            Object value = i.next();
            msg.writeObject(value);
        }
    }

    /**
     * Returns the body of the message.
     *
     * @param message the message
     * @return the body of the message
     * @throws JMSException for any JMS error
     */
    protected Object getBody(Message message) throws JMSException {
        StreamMessage msg = (StreamMessage) message;
        msg.reset();
        List result = new ArrayList();
        while (true) {
            try {
                Object value = msg.readObject();
                result.add(value);
            } catch (MessageEOFException exception) {
                break;
            }
        }
        return result;
    }

}