/*
 * 項目名稱 Pattern
 * 包名稱   com.niufish.pattern.command
 * 
 * 文件名稱 ConcreteCommand.java
 * 
 */
package com.niufish.pattern.command;

/**
 * 具體命令角色，定義一個接收者和行為之間的弱耦合，實現execute方法，負責調用接收者的相應操作。
 * <p>
 * <a href="ConcreteCommand.java.html"><i>View Source</i></a>
 * </p>
 * @author  Kingfish
 * @version 1.0
 */
public class ConcreteCommand implements Command {
    
    /**
     * 持有的接收者對象
     */
    private Receiver _receiver;
    
    /**
     * 初始化持有的接收者對象
     * @param receiver 接收者對象
     */
    public ConcreteCommand(Receiver receiver){
        _receiver = receiver;
    }
    /**
     * @see com.niufish.pattern.command.Command#execute()
     */
    public void execute() {
        _receiver.action();
    }
    
    /**
     * @see com.niufish.pattern.command.Command#unexecute()
     */
    public void unexecute() {
    }

}