Composite Pattern

1.将对象组合成树形结构以表示“部分--整体”的层次结构。组合模式使得用户对单个对象和组合对象的使用具有一致性。

2.Composite 模式结构图

3.实现

 1 #ifndef _COMPONENT_H_ 
 2 #define _COMPONENT_H_
 3 
 4 class Component 
 5 { 
 6 public: 
 7     Component();
 8     virtual ~Component();
 9 public: 
10     virtual void Operation() = 0;
11     virtual void Add(const Component& );
12     virtual void Remove(const Component& );
13     virtual Component* GetChild(int );
14 protected:
15 private:
16 };
17 
18 #endif

Component.h

 1 #include "Component.h"
 2 
 3 Component::Component() 
 4 {
 5 
 6 }
 7 Component::~Component() 
 8 {
 9 
10 }
11 void Component::Add(const Component& com) 
12 {
13 
14 }
15 Component* Component::GetChild(int index) 
16 { 
17     return 0;
18 }
19 void Component::Remove(const Component& com) 
20 {
21 
22 }

Component.cpp

 1 #ifndef _COMPOSITE_H_ 
 2 #define _COMPOSITE_H_
 3 
 4 #include "Component.h" 
 5 #include <vector> 
 6 using namespace std;
 7 
 8 class Composite:public Component 
 9 { 
10 public: 
11     Composite();
12     ~Composite();
13 public: 
14     void Operation();
15     void Add(Component* com);
16     void Remove(Component* com);
17     Component* GetChild(int index);
18 protected:
19 private: 
20     vector<Component*> comVec;
21 };
22 
23 #endif

Composite.h

 1 #include "Composite.h" 
 2 #include "Component.h"
 3 #define NULL 0 //define NULL POINTOR
 4 
 5 Composite::Composite() 
 6 { //vector<Component*>::iterator itend = comVec.begin(); 
 7 }
 8 Composite::~Composite() 
 9 {
10     
11 }
12 void Composite::Operation() 
13 { 
14     vector<Component*>::iterator comIter = comVec.begin();
15     for (;comIter != comVec.end();comIter++) 
16     { 
17         (*comIter)->Operation(); 
18     } 
19 }
20 void Composite::Add(Component* com) 
21 { 
22     comVec.push_back(com);
23 }
24 void Composite::Remove(Component* com) 
25 { 
26     comVec.erase(&com);
27 }
28 Component* Composite::GetChild(int index) 
29 { 
30     return comVec[index]; 
31 }

Composite.cpp

 1 #ifndef _LEAF_H_ 
 2 #define _LEAF_H_
 3 
 4 #include "Component.h"
 5 
 6 class Leaf:public Component 
 7 { 
 8 public: 
 9     Leaf();
10     ~Leaf();
11 void Operation();
12 protected:
13 private:
14 }; 
15 
16 #endif

Leaf.h

 1 #include "Leaf.h" 
 2 #include <iostream>
 3 
 4 using namespace std;
 5 
 6 Leaf::Leaf() 
 7 {
 8 
 9 }
10 Leaf::~Leaf() 
11 {
12 
13 }
14 void Leaf::Operation() 
15 { 
16     cout<<"Leaf operation....."<<endl; 
17 }

Leaf.cpp

 1 #include "Component.h" 
 2 #include "Composite.h" 
 3 #include "Leaf.h" 
 4 #include <iostream> 
 5 
 6 using namespace std;
 7 
 8 int main(int argc,char* argv[]) 
 9 { 
10     Leaf* l = new Leaf(); 
11     l->Operation();
12     Composite* com = new Composite();
13     com->Add(l);
14     com->Operation();
15     Component* ll = com->GetChild(0);
16     ll->Operation();
17 
18     return 0;
19 }

main.cpp