ChannelManager.java

/*
 * Copyright (c) Henrik Niehaus
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 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. Neither the name of the project (Lazy Bones) nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR 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, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package lazybones;

import java.text.ParseException;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.hampelratte.svdrp.Response;
import org.hampelratte.svdrp.commands.LSTC;
import org.hampelratte.svdrp.parsers.ChannelParser;
import org.hampelratte.svdrp.responses.highlevel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ChannelManager {

    private static transient Logger logger = LoggerFactory.getLogger(ChannelManager.class);

    private static ChannelManager instance;

    private static Map<String, Channel> channelMapping = new Hashtable<String, Channel>();

    private List<Channel> channels = null;

    public void update() {
        Response res = VDRConnection.send(new LSTC());
        if (res != null && res.getCode() == 250) {
            try {
                channels = ChannelParser.parse(res.getMessage(), true);
            } catch (ParseException e) {
                logger.error("Couldn't update channel list", e);
            }
        }
    }

    public static ChannelManager getInstance() {
        if (instance == null) {
            instance = new ChannelManager();
        }
        return instance;
    }

    public List<Channel> getChannels() {
        return channels;
    }

    public void setChannels(List<Channel> channels) {
        this.channels = channels;
    }

    public Channel getChannelByNumber(int channelNumber) {
        if (channels == null) {
            return null;
        }

        for (Iterator<Channel> iter = channels.iterator(); iter.hasNext();) {
            Channel chan = iter.next();
            if (chan.getChannelNumber() == channelNumber) {
                return chan;
            }
        }

        return null;
    }

    public static Map<String, Channel> getChannelMapping() {
        return channelMapping;
    }

    public static void setChannelMapping(Map<String, Channel> channelMapping) {
        ChannelManager.channelMapping = channelMapping;
    }

    public devplugin.Channel getTvbrowserChannel(LazyBonesTimer timer) throws ChannelNotFoundException {
        devplugin.Channel chan = null;
        for (String channelID : channelMapping.keySet()) {
            Channel channel = ChannelManager.getChannelMapping().get(channelID);
            if (channel.getChannelNumber() == timer.getChannelNumber()) {
                chan = getTvbrowserChannelById(channelID);
            }
        }

        if (chan == null) {
            throw new ChannelNotFoundException();
        } else {
            return chan;
        }
    }

    public devplugin.Channel getTvbrowserChannel(Channel chan) throws ChannelNotFoundException {
        devplugin.Channel tvbchan = null;
        for (Entry<String, Channel> entry : channelMapping.entrySet()) {
            Channel ctemp = entry.getValue();
            if (ctemp.getChannelNumber() == chan.getChannelNumber()) {
                tvbchan = getTvbrowserChannelById(entry.getKey());
            }
        }

        if (tvbchan == null) {
            throw new ChannelNotFoundException();
        } else {
            return tvbchan;
        }
    }

    public devplugin.Channel getTvbrowserChannelById(String id) {
        devplugin.Channel[] channels = LazyBones.getPluginManager().getSubscribedChannels();
        for (int i = 0; i < channels.length; i++) {
            if (channels[i].getId().equals(id)) {
                return channels[i];
            }
        }
        return null;
    }

    public static class ChannelNotFoundException extends Exception {

    }
}