CommandLineHandler.java

/*
 * Copyright(C) 2010-2011 Alibaba Group Holding Limited All rights reserved. Licensed under the Apache License, Version
 * 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the
 * License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language governing permissions and limitations
 * under the License.
 */
package com.alibaba.doris.cli;

import java.util.ArrayList;
import java.util.List;

/**
 * CommandLineHandler
 * 
 * @author Kun He (Raymond He), kun.hek@alibaba-inc.com
 * @since 1.0 2011-7-28
 */
public abstract class CommandLineHandler {
	
	protected List<Option> options = new ArrayList<Option>();
	protected CommandLine commandLine;
	protected String[] args ;
	
	public void setOptions(List<Option> options) {
		this.options = options;
	}
	
	public List<Option> getOptions() {
		return options;
	}
	
	public void handle(String args[]) {
		Parser  parser = new Parser();
		try {
			this.args = args;
			commandLine = parser.parse(options, args);
			
			prepareParameters();
			
			handleCommand();
		} catch(CommandExecutionException e) {
			System.err.println("Command error:\r\n" + e );
		}
		catch (CommandException e) {
			System.err.println("Command error:\r\n" + e.getMessage() );
			System.err.println("help:\r\n" + new HelpPrinter(options).helpString() );
		}
	}

	public String[] getArgs() {
		return args;
	}
	
	public abstract void prepareParameters() ;
	
	public abstract void handleCommand();

	
}