ShellCommandRegistry.java

/*
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version. You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

package org.aitools.programd.interfaces.shell;

import java.util.Collection;

import org.aitools.util.ObjectExemplarRegistry;

/**
 * Maps ShellCommands to their command strings.
 * 
 * @author <a href="mailto:noel@aitools.org">Noel Bush</a>
 */
public class ShellCommandRegistry extends ObjectExemplarRegistry<ShellCommand> {

  /** The list of built-in shell commands (fully-qualified class names). */
  private static final String[] COMMAND_LIST = { "org.aitools.programd.interfaces.shell.AIMLCommand",
      "org.aitools.programd.interfaces.shell.BotListCommand",
      "org.aitools.programd.interfaces.shell.CategoriesCommand",
      "org.aitools.programd.interfaces.shell.FlushPredicatesCommand",
      "org.aitools.programd.interfaces.shell.HelpCommand", "org.aitools.programd.interfaces.shell.ListBotFilesCommand",
      "org.aitools.programd.interfaces.shell.ListCommandablesCommand",
      "org.aitools.programd.interfaces.shell.LoadCommand", "org.aitools.programd.interfaces.shell.MemoryCommand",
      "org.aitools.programd.interfaces.shell.PrintGraphCommand", "org.aitools.programd.interfaces.shell.TalkToCommand",
      "org.aitools.programd.test.aiml.TestCommand", "org.aitools.programd.interfaces.shell.UnloadCommand",
      "org.aitools.programd.interfaces.shell.WhoCommand" };

  /**
   * Creates a new <code>AIMLProcessorRegistry</code>, with no additional commands.
   */
  public ShellCommandRegistry() {
    super(COMMAND_LIST, ShellCommand.class);
  }

  /**
   * @param commandLine the command line to be processed
   * @return the <code>ShellCommand</code> associated with the given command string
   * @throws NoSuchCommandException if no matching <code>ShellCommand</code> is available
   */
  public ShellCommand getHandlerFor(String commandLine) throws NoSuchCommandException {
    for (ShellCommand command : this.registry.values()) {
      if (command.handles(commandLine)) {
        return command;
      }
    }
    throw new NoSuchCommandException(commandLine);
  }

  /**
   * @return the values stored in this map
   */
  public Collection<ShellCommand> getValues() {
    return this.registry.values();
  }
}