/**
 *
 * Copyright 2003-2006 Jive Software.
 *
 * 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.jivesoftware.smackx.jingleold.media;

import org.jivesoftware.smackx.jingleold.JingleSession;
import org.jivesoftware.smackx.jingleold.nat.JingleTransportManager;
import org.jivesoftware.smackx.jingleold.nat.TransportCandidate;

import java.util.List;

/**
 * This class provides necessary Jingle Session jmf methods and behavior.
 * <p/>
 * The goal of this class is to provide a flexible way to make JingleManager control jmf streaming APIs without implement them.
 * For instance you can implement a file transfer using java sockets or a VOIP Media Manager using JMF.
 * You can implement many JingleMediaManager according to you necessity.
 *
 * @author Thiago Camargo
 */
public abstract class JingleMediaManager {
    
    public static final String MEDIA_NAME = "JingleMediaManager";

    // Each media manager must keep track of the transport manager that it uses.
    private JingleTransportManager transportManager;

    public JingleMediaManager(JingleTransportManager transportManager) {
        this.transportManager = transportManager;
    }
    
    /**
     * Return   The transport manager that goes with this media manager.
     */
    public JingleTransportManager getTransportManager() {
        return transportManager;
    }

    /**
     * Return all supported Payloads for this Manager
     *
     * @return The Payload List
     */
    public abstract List<PayloadType> getPayloads();

    /**
     * Returns the Preferred PayloadType of the Media Manager
     *
     * @return The PayloadType
     */
    public PayloadType getPreferredPayloadType() {
        return getPayloads().size() > 0 ? getPayloads().get(0) : null;
    }

    /**
     * Create a Media Session Implementation
     *
     * @param payloadType
     * @param remote
     * @param local
     * @return the media session
     */
    public abstract JingleMediaSession createMediaSession(PayloadType payloadType, final TransportCandidate remote,
            final TransportCandidate local, JingleSession jingleSession);
    
    // This is to set the attributes of the <content> element of the Jingle packet.    
    public String getName() {
        return MEDIA_NAME;
    }

}