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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.qpid.amqp_1_0.jms.impl;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import org.apache.qpid.amqp_1_0.client.AcknowledgeMode;
import org.apache.qpid.amqp_1_0.client.Message;
import org.apache.qpid.amqp_1_0.client.Receiver;
import org.apache.qpid.amqp_1_0.jms.QueueBrowser;
import org.apache.qpid.amqp_1_0.type.AmqpErrorException;
import org.apache.qpid.amqp_1_0.type.Symbol;
import org.apache.qpid.amqp_1_0.type.messaging.Filter;
import org.apache.qpid.amqp_1_0.type.messaging.JMSSelectorFilter;
import org.apache.qpid.amqp_1_0.type.messaging.StdDistMode;
import org.apache.qpid.amqp_1_0.type.transport.AmqpError;
public class QueueBrowserImpl implements QueueBrowser
{
private static final String JMS_SELECTOR = "jms-selector";
private QueueImpl _queue;
private String _selector;
private Receiver _receiver;
private Message _nextElement;
private MessageEnumeration _enumeration;
QueueBrowserImpl(final QueueImpl queue, final String selector, SessionImpl session) throws JMSException
{
_queue = queue;
_selector = selector;
Map<Symbol, Filter> filters;
if(selector == null || selector.trim().equals(""))
{
filters = null;
}
else
{
filters = Collections.singletonMap(Symbol.valueOf(JMS_SELECTOR),(Filter) new JMSSelectorFilter(_selector));
}
try
{
_receiver = session.getClientSession().createReceiver(queue.getAddress(),
StdDistMode.COPY,
AcknowledgeMode.AMO,null,
false,
filters, null);
_nextElement = _receiver.receive(0L);
_enumeration = new MessageEnumeration();
}
catch(AmqpErrorException e)
{
org.apache.qpid.amqp_1_0.type.transport.Error error = e.getError();
if(AmqpError.INVALID_FIELD.equals(error.getCondition()))
{
throw new InvalidSelectorException(e.getMessage());
}
else
{
throw new JMSException(e.getMessage(), error.getCondition().getValue().toString());
}
}
}
public QueueImpl getQueue()
{
return _queue;
}
public String getMessageSelector()
{
return _selector;
}
public Enumeration getEnumeration() throws JMSException
{
if(_enumeration == null)
{
throw new IllegalStateException("Browser has been closed");
}
return _enumeration;
}
public void close() throws JMSException
{
_receiver.close();
_enumeration = null;
}
private final class MessageEnumeration implements Enumeration<Message>
{
@Override
public boolean hasMoreElements()
{
return _nextElement != null;
}
@Override
public Message nextElement()
{
Message message = _nextElement;
if(message == null)
{
message = _receiver.receive(0l);
}
if(message != null)
{
_nextElement = _receiver.receive(0l);
}
return message;
}
}
}
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