chris@3: /* chris@3: * SONEWS News Server chris@3: * see AUTHORS for the list of contributors chris@3: * chris@3: * This program is free software: you can redistribute it and/or modify chris@3: * it under the terms of the GNU General Public License as published by chris@3: * the Free Software Foundation, either version 3 of the License, or chris@3: * (at your option) any later version. chris@3: * chris@3: * This program is distributed in the hope that it will be useful, chris@3: * but WITHOUT ANY WARRANTY; without even the implied warranty of chris@3: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the chris@3: * GNU General Public License for more details. chris@3: * chris@3: * You should have received a copy of the GNU General Public License chris@3: * along with this program. If not, see . chris@3: */ chris@3: chris@3: package org.sonews.daemon; chris@3: chris@3: import java.util.HashMap; chris@3: import java.util.Map; chris@3: import java.util.concurrent.ConcurrentHashMap; chris@3: import org.sonews.daemon.command.Command; chris@3: import org.sonews.daemon.command.UnsupportedCommand; chris@3: import org.sonews.util.Log; chris@3: import org.sonews.util.io.Resource; chris@3: chris@3: /** chris@3: * Selects the correct command processing class. chris@3: * @author Christian Lins chris@3: */ chris@3: class CommandSelector chris@3: { chris@3: chris@3: private static Map instances chris@3: = new ConcurrentHashMap(); chris@3: chris@3: public static CommandSelector getInstance() chris@3: { chris@3: CommandSelector csel = instances.get(Thread.currentThread()); chris@3: if(csel == null) chris@3: { chris@3: csel = new CommandSelector(); chris@3: instances.put(Thread.currentThread(), csel); chris@3: } chris@3: return csel; chris@3: } chris@3: chris@3: private Map commandMapping = new HashMap(); chris@3: private Command unsupportedCmd = new UnsupportedCommand(); chris@3: chris@3: private CommandSelector() chris@3: { chris@3: String[] classes = Resource.getAsString("helpers/commands.list", true).split("\n"); chris@3: for(String className : classes) chris@3: { chris@3: try chris@3: { chris@3: Class clazz = Class.forName(className); chris@3: Command cmd = (Command)clazz.newInstance(); chris@3: String[] cmdStrs = cmd.getSupportedCommandStrings(); chris@3: for(String cmdStr : cmdStrs) chris@3: { chris@3: this.commandMapping.put(cmdStr, cmd); chris@3: } chris@3: } chris@3: catch(ClassNotFoundException ex) chris@3: { chris@3: Log.msg("Could not load command class: " + ex, false); chris@3: } chris@3: catch(InstantiationException ex) chris@3: { chris@3: Log.msg("Could not instantiate command class: " + ex, false); chris@3: } chris@3: catch(IllegalAccessException ex) chris@3: { chris@3: Log.msg("Could not access command class: " + ex, false); chris@3: } chris@3: } chris@3: } chris@3: chris@3: public Command get(String commandName) chris@3: { chris@3: try chris@3: { chris@3: commandName = commandName.toUpperCase(); chris@3: Command cmd = this.commandMapping.get(commandName); chris@3: chris@3: if(cmd == null) chris@3: { chris@3: return this.unsupportedCmd; chris@3: } chris@3: else if(cmd.isStateful()) chris@3: { chris@3: return cmd.getClass().newInstance(); chris@3: } chris@3: else chris@3: { chris@3: return cmd; chris@3: } chris@3: } chris@3: catch(Exception ex) chris@3: { chris@3: ex.printStackTrace(); chris@3: return this.unsupportedCmd; chris@3: } chris@3: } chris@3: chris@3: }