/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * Licensed 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.client;

import org.apache.qpid.url.BindingURL;
import org.apache.qpid.exchange.ExchangeDefaults;

import javax.jms.JMSException;
import javax.jms.Topic;

public class AMQTopic extends AMQDestination implements Topic
    {
    /**
    * Constructor for use in creating a topic using a BindingURL.
     *
     * @param binding The binding url object.
    */
    public AMQTopic(BindingURL binding)
    {
        super(binding);
    }

    public AMQTopic(String name)
    {
        super(ExchangeDefaults.TOPIC_EXCHANGE_NAME, ExchangeDefaults.TOPIC_EXCHANGE_CLASS, name, true, true, null);
        _isDurable = false;
    }

    /**
     * Constructor for use in creating a topic to represent a durable subscription
     * @param topic
     * @param clientId
     * @param subscriptionName
     */
    public AMQTopic(AMQTopic topic, String clientId, String subscriptionName)
    {
        super(ExchangeDefaults.TOPIC_EXCHANGE_NAME, ExchangeDefaults.TOPIC_EXCHANGE_CLASS, topic.getDestinationName(), true, false, clientId + ":" + subscriptionName);
        _isDurable = true;
    }

    public String getTopicName() throws JMSException
    {
        return super.getDestinationName();
    }

    public String getEncodedName()
    {
        return 'T' + getDestinationName();
    }

     public String getRoutingKey()
    {
        return getDestinationName();
    }

    public boolean isNameRequired()
    {
        // Topics always rely on a server generated queue name.
        return false;
    }

    /**
     * Override since the queue is always private and we must ensure it remains null. If not,
     * reuse of the topic when registering consumers will make all consumers listen on the same (private) queue rather
     * than getting their own (private) queue.
     *
     * This is relatively nasty but it is difficult to come up with a more elegant solution, given
     * the requirement in the case on AMQQueue and possibly other AMQDestination subclasses to
     * use the underlying queue name even where it is server generated.
     */
    public void setQueueName(String queueName)
    {
    }
}
