Java tutorial
/* * Forge Mod Loader * Copyright (c) 2012-2013 cpw. * All rights reserved. This program and the accompanying materials * are made available under the terms of the GNU Lesser Public License v2.1 * which accompanies this distribution, and is available at * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html * * Contributors: * cpw - implementation */ package cpw.mods.fml.common.network; import static cpw.mods.fml.common.network.FMLPacket.Type.MOD_IDENTIFIERS; import static cpw.mods.fml.common.network.FMLPacket.Type.MOD_LIST_RESPONSE; import static cpw.mods.fml.common.network.FMLPacket.Type.MOD_MISSING; import static cpw.mods.fml.common.network.FMLPacket.Type.MOD_IDMAP; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.logging.Logger; import net.minecraft.nbt.NBTTagList; import net.minecraft.network.*; import net.minecraft.network.packet.*; import com.google.common.collect.Lists; import com.google.common.collect.Maps; import com.google.common.io.ByteArrayDataInput; import com.google.common.io.ByteArrayDataOutput; import com.google.common.io.ByteStreams; import cpw.mods.fml.common.FMLLog; import cpw.mods.fml.common.Loader; import cpw.mods.fml.common.ModContainer; import cpw.mods.fml.common.registry.GameData; import cpw.mods.fml.common.registry.GameRegistry; public class ModListResponsePacket extends FMLPacket { private Map<String, String> modVersions; private List<String> missingMods; public ModListResponsePacket() { super(MOD_LIST_RESPONSE); } @Override public byte[] generatePacket(Object... data) { Map<String, String> modVersions = (Map<String, String>) data[0]; List<String> missingMods = (List<String>) data[1]; ByteArrayDataOutput dat = ByteStreams.newDataOutput(); dat.writeInt(modVersions.size()); for (Entry<String, String> version : modVersions.entrySet()) { dat.writeUTF(version.getKey()); dat.writeUTF(version.getValue()); } dat.writeInt(missingMods.size()); for (String missing : missingMods) { dat.writeUTF(missing); } return dat.toByteArray(); } @Override public FMLPacket consumePacket(byte[] data) { ByteArrayDataInput dat = ByteStreams.newDataInput(data); int versionListSize = dat.readInt(); modVersions = Maps.newHashMapWithExpectedSize(versionListSize); for (int i = 0; i < versionListSize; i++) { String modName = dat.readUTF(); String modVersion = dat.readUTF(); modVersions.put(modName, modVersion); } int missingModSize = dat.readInt(); missingMods = Lists.newArrayListWithExpectedSize(missingModSize); for (int i = 0; i < missingModSize; i++) { missingMods.add(dat.readUTF()); } return this; } @Override public void execute(INetworkManager network, FMLNetworkHandler handler, NetHandler netHandler, String userName) { Map<String, ModContainer> indexedModList = Maps.newHashMap(Loader.instance().getIndexedModList()); List<String> missingClientMods = Lists.newArrayList(); List<String> versionIncorrectMods = Lists.newArrayList(); for (String m : missingMods) { ModContainer mc = indexedModList.get(m); NetworkModHandler networkMod = handler.findNetworkModHandler(mc); if (networkMod.requiresClientSide()) { missingClientMods.add(m); } } for (Entry<String, String> modVersion : modVersions.entrySet()) { ModContainer mc = indexedModList.get(modVersion.getKey()); NetworkModHandler networkMod = handler.findNetworkModHandler(mc); if (!networkMod.acceptVersion(modVersion.getValue())) { versionIncorrectMods.add(modVersion.getKey()); } } Packet250CustomPayload pkt = new Packet250CustomPayload(); pkt.field_73630_a = "FML"; if (missingClientMods.size() > 0 || versionIncorrectMods.size() > 0) { pkt.field_73629_c = FMLPacket.makePacket(MOD_MISSING, missingClientMods, versionIncorrectMods); Logger.getLogger("Minecraft") .info(String.format("User %s connection failed: missing %s, bad versions %s", userName, missingClientMods, versionIncorrectMods)); FMLLog.info("User %s connection failed: missing %s, bad versions %s", userName, missingClientMods, versionIncorrectMods); // Mark this as bad FMLNetworkHandler.setHandlerState((NetLoginHandler) netHandler, FMLNetworkHandler.MISSING_MODS_OR_VERSIONS); pkt.field_73628_b = pkt.field_73629_c.length; network.func_74429_a(pkt); } else { pkt.field_73629_c = FMLPacket.makePacket(MOD_IDENTIFIERS, netHandler); Logger.getLogger("Minecraft") .info(String.format("User %s connecting with mods %s", userName, modVersions.keySet())); FMLLog.info("User %s connecting with mods %s", userName, modVersions.keySet()); pkt.field_73628_b = pkt.field_73629_c.length; network.func_74429_a(pkt); NBTTagList itemList = new NBTTagList(); GameData.writeItemData(itemList); byte[][] registryPackets = FMLPacket.makePacketSet(MOD_IDMAP, itemList); for (int i = 0; i < registryPackets.length; i++) { network.func_74429_a(PacketDispatcher.getPacket("FML", registryPackets[i])); } } // reset the continuation flag - we have completed extra negotiation and the login should complete now NetLoginHandler.func_72531_a((NetLoginHandler) netHandler, true); } }