MBOriginator.java

package com.cheng.zenofdesignpatterns.patterns.memento.multibackup;

/**
 *
 */
public class MBOriginator {
	
	// 内部状态
	private String state = "";
	
	public String getState() {
		return state;
	}

	public void setState(String state) {
		this.state = state;
	}

	// 创建一个备忘录
	public IMemento createMemento(){
		return new Memento(this.state);
	}
	
	// 恢复一个备忘录
	public void restoreMemento(IMemento _memento){
		this.setState(((Memento)_memento).getState());
	}
	
	// 内置类
	private class Memento implements IMemento{
		
		// 发起人的内部状态
		private String state = "";
		
		// 构造函数传递参数
		private Memento(String _state){
			this.state = _state;
		}
		
		private String getState() {
			return state;
		}

		private void setState(String state) {
			this.state = state;
		}
		
	}

}