PluginChannels.java
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package com.mumfrey.liteloader.core;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import net.minecraft.src.Minecraft;
import net.minecraft.src.NetHandler;
import net.minecraft.src.Packet1Login;
import net.minecraft.src.Packet250CustomPayload;
import com.mumfrey.liteloader.PluginChannelListener;
import com.mumfrey.liteloader.core.hooks.HookPluginChannels;
import com.mumfrey.liteloader.permissions.PermissionsManagerClient;
/**
* Manages plugin channel connections and subscriptions for LiteLoader
*
* @author Adam Mummery-Smith
*/
public class PluginChannels
{
// reserved channel consts
private static final String CHANNEL_REGISTER = "REGISTER";
private static final String CHANNEL_UNREGISTER = "UNREGISTER";
/**
* True if we have initialised the hook
*/
private boolean hookInitDone;
/**
* Mapping of plugin channel names to listeners
*/
private HashMap<String, LinkedList<PluginChannelListener>> pluginChannels = new HashMap<String, LinkedList<PluginChannelListener>>();
/**
* List of mods which implement PluginChannelListener interface
*/
private LinkedList<PluginChannelListener> pluginChannelListeners = new LinkedList<PluginChannelListener>();
/**
* @param loader
*/
public PluginChannels()
{
}
/**
*
*/
public void initHook()
{
// Plugin channels hook
if (this.pluginChannelListeners.size() > 0 && !this.hookInitDone)
{
HookPluginChannels.register();
HookPluginChannels.registerPacketHandler(this);
this.hookInitDone = true;
}
}
/**
* @param pluginChannelListener
*/
public void addPluginChannelListener(PluginChannelListener pluginChannelListener)
{
if (!this.pluginChannelListeners.contains(pluginChannelListener))
{
this.pluginChannelListeners.add(pluginChannelListener);
if (this.hookInitDone)
this.initHook();
}
}
/**
* @param netHandler
* @param loginPacket
*/
public void onConnectToServer(NetHandler netHandler, Packet1Login loginPacket)
{
this.setupPluginChannels();
}
/**
* Callback for the plugin channel hook
*
* @param customPayload
*/
public void onPluginChannelMessage(Packet250CustomPayload customPayload)
{
if (customPayload != null && customPayload.channel != null && this.pluginChannels.containsKey(customPayload.channel))
{
try
{
PermissionsManagerClient permissionsManager = LiteLoader.getPermissionsManager();
if (permissionsManager != null)
{
permissionsManager.onCustomPayload(customPayload.channel, customPayload.length, customPayload.data);
}
}
catch (Exception ex) {}
for (PluginChannelListener pluginChannelListener : this.pluginChannels.get(customPayload.channel))
{
try
{
pluginChannelListener.onCustomPayload(customPayload.channel, customPayload.length, customPayload.data);
}
catch (Exception ex) {}
}
}
}
/**
* Query loaded mods for registered channels
*/
protected void setupPluginChannels()
{
// Clear any channels from before
this.pluginChannels.clear();
// Add the permissions manager channels
this.addPluginChannelsFor(LiteLoader.getPermissionsManager());
// Enumerate mods for plugin channels
for (PluginChannelListener pluginChannelListener : this.pluginChannelListeners)
{
this.addPluginChannelsFor(pluginChannelListener);
}
// If any mods have registered channels, send the REGISTER packet
if (this.pluginChannels.keySet().size() > 0)
{
StringBuilder channelList = new StringBuilder();
boolean separator = false;
for (String channel : this.pluginChannels.keySet())
{
if (separator) channelList.append("\u0000");
channelList.append(channel);
separator = true;
}
byte[] registrationData = channelList.toString().getBytes(Charset.forName("UTF8"));
PluginChannels.sendMessage(CHANNEL_REGISTER, registrationData);
}
}
/**
* Adds plugin channels for the specified listener to the local channels
* collection
*
* @param pluginChannelListener
*/
private void addPluginChannelsFor(PluginChannelListener pluginChannelListener)
{
List<String> channels = pluginChannelListener.getChannels();
if (channels != null)
{
for (String channel : channels)
{
if (channel.length() > 16 || channel.toUpperCase().equals(CHANNEL_REGISTER) || channel.toUpperCase().equals(CHANNEL_UNREGISTER))
continue;
if (!this.pluginChannels.containsKey(channel))
{
this.pluginChannels.put(channel, new LinkedList<PluginChannelListener>());
}
this.pluginChannels.get(channel).add(pluginChannelListener);
}
}
}
public static void sendMessage(String channel, byte[] data)
{
if (channel == null || channel.length() > 16)
throw new RuntimeException("Invalid channel name specified");
try
{
Minecraft minecraft = Minecraft.getMinecraft();
if (minecraft.thePlayer != null && minecraft.thePlayer.sendQueue != null)
{
Packet250CustomPayload payload = new Packet250CustomPayload(channel, data);
minecraft.thePlayer.sendQueue.addToSendQueue(payload);
}
}
catch (Exception ex) {}
}
}