/**
* Returns all the available commands a user can issue through a client's {@link
* #handleCommand(String)} method. The returned set depends on the command handlers added to this
* client. At least the commands enabled by the BaseCommandHandler will be returned by this
* command, because this command handler is always added to any client by default.
*
* @return
*/
public Set<String> getAvailableCommands() {
Set<String> cmdList = new HashSet<String>();
for (CommandHandler handler : cmdHandlers) {
cmdList.addAll(handler.getCommandList());
}
return cmdList;
}
/**
* Runs a particular command via appropriate command handler. The result is returned in the {@link
* CommandResult} data structure.
*
* @param commandString The command string to be run. It includes command, its options, and
* arguments all separated by space. It is upto the relavant command handler to distinguish
* between comand, options, and arguments.
* @return A {@link CommandResult} data structure which includes the result of running the
* command. In case of an error, it as well is stored in the returned data strucute.
* @throws ParseException
* @see CommandResult
*/
public CommandResult handleCommand(String commandString) throws ParseException {
CommandResult cmdResult = new CommandResult(commandString);
if (!cmdResult.isError()) {
CommandHandler handler = getCommandHandler(cmdResult.command);
if (handler == null) {
cmdResult.errMsg =
"Command " + cmdResult.command + " is not supported\n" + "Type 'help' for more info";
} else {
handler.runCommand(cmdResult);
}
}
return cmdResult;
}
/**
* Returns the help text for a particular command. For this command to work properly, the command
* should be supported by one of the command handlers enabled in the client and the command
* handler who supports this command should also include a help text for that command.
*
* @see #addCommandHandler(CommandHandler), {@link CommandHandler}
* @param cmd The command for which help needed.
* @return The help text for the specified command, null if the command is not found in any of the
* command handlers.
*/
public String getCommandHelp(String cmd) {
for (CommandHandler handler : cmdHandlers) {
if (handler.supportCommand(cmd)) return handler.getHelp(cmd);
}
return null;
}
/**
* Returns the command handler that handles the given cmd
*
* @param cmd
* @return
*/
protected CommandHandler getCommandHandler(String cmd) {
for (CommandHandler handler : cmdHandlers) {
if (handler.supportCommand(cmd)) return handler;
}
return null;
}
