综合与战略相结合 [英] Combining Composite and Strategy

问题描述

我正在寻找一个例子，展示如何组合这2种设计模式（战略与综合）。我知道如何使用Strategy，但Composite对我来说还不够清楚，所以我看不出如何组合它们。有人有例子或smthg吗？

干杯

解决方案

好的，这是一种方法，蓝色（伪Java代码）：

 界面TradingStrategy {
 void buy（）; 
 void sell（）; 
} 
 
 class HedgingLongTermStrategy实现TradingStrategy {
 void buy（）{/ * TODO：* /}; 
 void sell（）{/ * TODO：* /}; 
} 
 
 class HighFreqIntradayStrategy实现TradingStrategy {
 void buy（）{/ * TODO：* /}; 
 void sell（）{/ * TODO：* /}; 
} 
 
 class CompositeTradingStrategy扩展ArrayList&TradingStrategy>实施TradingStrategy {
 void buy（）{
 for（TradingStrategy strategy：this）{
 strategy.buy（）; 
} 
} 
 void sell（）{
 for（TradingStrategy strategy：this）{
 strategy.sell（）; 
} 
} 
} 
 
 //样本代码
 TradingStrategy composite = new CompositeTradingStrategy（）; 
 composite.add（new HighFreqIntradayStrategy（））; 
 composite.add（new HedgingLongTermStrategy（））; 
 composite.buy（）; 
  

I am looking for an example showing how to combine this 2 design patterns (Strategy and Composite). I know how to use Strategy, but Composite is not enough clear for me, so I can't really see how to combine them. Does someone have example or smthg?
Cheers

解决方案

ok this is a way to do that out of the blue (in pseudo Java code):

interface TradingStrategy {
    void buy();
    void sell();   
}

class HedgingLongTermStrategy implements TradingStrategy {
    void buy() { /* TODO: */ };
    void sell() { /* TODO: */ };   
}

class HighFreqIntradayStrategy implements TradingStrategy {
    void buy() { /* TODO: */ };
    void sell() { /* TODO: */ };   
}

class CompositeTradingStrategy extends ArrayList<TradingStrategy> implements TradingStrategy {
    void buy() {
       for (TradingStrategy strategy : this) {
           strategy.buy();
       }
    }
    void sell() {
       for (TradingStrategy strategy : this) {
           strategy.sell();
       }
    }
}

// sample code
TradingStrategy composite = new CompositeTradingStrategy();
composite.add(new HighFreqIntradayStrategy());  
composite.add(new HedgingLongTermStrategy());
composite.buy();

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