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package bjc.utils.cli;

/**
 * Generic command implementation
 *
 * @author ben
 *
 */
public class GenericCommand implements ICommand {
	// The behavior for invoking the command
	private ICommandHandler handler;

	// The help for the command
	private ICommandHelp help;

	/**
	 * Create a new generic command
	 *
	 * @param handler
	 *                The handler to use for the command
	 * @param description
	 *                The description of the command. May be null
	 * @param help
	 *                The detailed help message for the command. May be null
	 */
	public GenericCommand(ICommandHandler handler, String description, String help) {
		if(handler == null) throw new NullPointerException("Command handler must not be null");

		this.handler = handler;

		if(description == null) {
			this.help = new NullHelp();
		} else {
			this.help = new GenericHelp(description, help);
		}
	}

	@Override
	public ICommand aliased() {
		return new DelegatingCommand(this);
	}

	@Override
	public ICommandHandler getHandler() {
		return handler;
	}

	@Override
	public ICommandHelp getHelp() {
		return help;
	}

	@Override
	public boolean isAlias() {
		return false;
	}
}