Java tutorial
/* * This file is part of Zinc, licensed under the MIT License (MIT). * * Copyright (c) 2015-2016, Jamie Mansfield <https://github.com/jamierocks> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package uk.jamierocks.zinc; import com.google.common.collect.Lists; import com.google.common.collect.Maps; import org.apache.commons.lang3.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.spongepowered.api.Game; import org.spongepowered.api.command.CommandCallable; import org.spongepowered.api.command.CommandResult; import org.spongepowered.api.command.CommandSource; import org.spongepowered.api.command.args.CommandArgs; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.List; import java.util.Map; /** * Represents a command service, for Zinc commands. * * @author Jamie Mansfield. */ public class CommandService { protected static final Logger ZINC_LOGGER = LoggerFactory.getLogger("Zinc"); private final Game game; public CommandService(Game game) { this.game = game; } /** * Registers all the commands from the given holder. * * @param plugin the owning plugin. * @param holder the command holder. */ public void registerCommands(Object plugin, Object holder) { Map<CommandCallable, Command> subCommands = Maps.newHashMap(); Logger pluginLogger = LoggerFactory.getLogger(plugin.getClass()); for (Method method : holder.getClass().getDeclaredMethods()) { if (method.isAnnotationPresent(Command.class)) { Command command = method.getAnnotation(Command.class); if (method.getParameterTypes().length == 2 && method.getParameterTypes()[0] == CommandSource.class && method.getParameterTypes()[1] == CommandArgs.class && method.getReturnType() == CommandResult.class) { CommandCallable commandCallable = new ZincCommandCallable(pluginLogger, command, holder, method); if (StringUtils.isEmpty(command.parent())) { this.game.getCommandManager().register(plugin, new ZincDispatcher(commandCallable), Lists.asList(command.name(), command.aliases())); } else { subCommands.put(commandCallable, command); } } else { if (method.getReturnType() != CommandResult.class) { ZINC_LOGGER.error(String.format("Command has wrong return type: %s#%s Should be %s", holder.getClass().getName(), method.getName(), CommandResult.class.getName())); } if (method.getParameterTypes().length != 2 || method.getParameterTypes()[0] != CommandSource.class || method.getParameterTypes()[1] != CommandArgs.class) { ZINC_LOGGER.error( String.format("Command has wrong argument types: %s#%s Should have %s and %s", holder.getClass().getName(), method.getName(), CommandSource.class.getName(), CommandArgs.class.getName())); } } } else if (method.isAnnotationPresent(TabComplete.class)) { TabComplete tabComplete = method.getAnnotation(TabComplete.class); if (method.getParameterTypes().length == 2 && method.getParameterTypes()[0] == CommandSource.class && method.getParameterTypes()[1] == String.class && method.getReturnType() == List.class) { final ZincDispatcher.SuggestionHandler suggestionHandler = (src, arguments) -> { try { return (List<String>) method.invoke(holder, src, arguments); } catch (IllegalAccessException e) { pluginLogger.error("Failed to invoke instance", e); } catch (InvocationTargetException e) { pluginLogger.error("Failed to invoke instance", e); } return Lists.newArrayList(); }; if (this.game.getCommandManager().get(tabComplete.name()).isPresent() && this.game.getCommandManager().get(tabComplete.name()).get() .getCallable() instanceof ZincDispatcher) { ZincDispatcher dispatcher = (ZincDispatcher) this.game.getCommandManager() .get(tabComplete.name()).get().getCallable(); dispatcher.setSuggestionHandler(suggestionHandler); } else { ZINC_LOGGER.error(String.format( "Tab complete attempted to register, but parent command wasn't found: %s", tabComplete.name())); } } else { if (method.getReturnType() != List.class) { ZINC_LOGGER.error(String.format("Tab complete has wrong return type: %s#%s Should be %s", holder.getClass().getName(), method.getName(), List.class.getName())); } if (method.getParameterTypes().length != 2 || method.getParameterTypes()[0] != CommandSource.class || method.getParameterTypes()[1] != String.class) { ZINC_LOGGER.error( String.format("Tab complete has wrong argument types: %s#%s Should have %s and %s", holder.getClass().getName(), method.getName(), CommandSource.class.getName(), String.class.getName())); } } } } for (CommandCallable commandCallable : subCommands.keySet()) { Command command = subCommands.get(commandCallable); if (this.game.getCommandManager().get(command.parent()).isPresent() && this.game.getCommandManager() .get(command.parent()).get().getCallable() instanceof ZincDispatcher) { ZincDispatcher dispatcher = (ZincDispatcher) this.game.getCommandManager().get(command.parent()) .get().getCallable(); dispatcher.register(commandCallable, Lists.asList(command.name(), command.aliases())); } else { ZINC_LOGGER.error(String.format("Sub command was registered, but parent command wasn't found: %s", command.parent())); } } } }