70 lines
1.0 KiB
C++
70 lines
1.0 KiB
C++
#ifndef _ITERATOR_H_
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#define _ITERATOR_H_
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#pragma once
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#include "Aggregate.h"
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#include <vector>
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using namespace std;
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// 抽象迭代器
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class Iterator
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{
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public:
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Iterator(){}
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virtual ~Iterator(){}
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// 声明抽象遍历方法
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virtual void first() = 0;
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virtual void last() = 0;
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virtual void next() = 0;
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virtual void previous() = 0;
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virtual bool hasNext() = 0;
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virtual bool hasPrevious() = 0;
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virtual void currentChannel() = 0;
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private:
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};
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// 遥控器：具体迭代器
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class RemoteControl :public Iterator
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{
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public:
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RemoteControl(){}
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void setTV(Television *iTv){
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this->tv = iTv;
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cursor = -1;
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totalNum = tv->getTotalChannelNum();
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}
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// 实现各个遍历方法
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void first(){
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cursor = 0;
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}
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void last(){
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cursor = totalNum - 1;
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}
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void next(){
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cursor++;
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}
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void previous(){
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cursor--;
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}
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bool hasNext(){
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return !(cursor == totalNum);
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}
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bool hasPrevious(){
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return !(cursor == -1);
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}
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void currentChannel(){
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tv->play(cursor);
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}
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private:
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// 游标
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int cursor;
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// 总的频道数目
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int totalNum;
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// 电视
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Television* tv;
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};
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#endif |