《設(shè)計(jì)模式11》-合成模式

3.合成模式(CompsitePattern)引入—各種樹(shù)形結(jié)構(gòu)樹(shù)枝樹(shù)葉樹(shù)枝樹(shù)枝樹(shù)葉樹(shù)枝樹(shù)葉樹(shù)枝樹(shù)枝樹(shù)葉樹(shù)枝樹(shù)葉樹(shù)枝樹(shù)枝樹(shù)葉樹(shù)的表示根節(jié)點(diǎn)(特殊的樹(shù)枝/葉子節(jié)點(diǎn))樹(shù)枝節(jié)點(diǎn)葉子節(jié)點(diǎn)是否有更一般化的表示呢？即不論哪種節(jié)點(diǎn)，訪問(wèn)的方法最好能一致些呢？一般化表示一般化表示的好處用樹(shù)形結(jié)構(gòu)表示線性的整體-部分關(guān)系訪問(wèn)任意一個(gè)結(jié)點(diǎn)時(shí)不需要判定或明確結(jié)點(diǎn)類型子節(jié)點(diǎn)的管理AddChild(),RemoveChild(),GetChild(int),GetChildren()等只對(duì)樹(shù)枝節(jié)點(diǎn)有意義這些管理子節(jié)點(diǎn)的操作放哪個(gè)類里呢？放Node中(透明式)放BranchNode中(安全式)透明式合成模式結(jié)構(gòu)（1）透明式合成模式結(jié)構(gòu)（2）安全式合成模式例1計(jì)算機(jī)中的各種設(shè)備，一種設(shè)備可以由多個(gè)子設(shè)備合成classEquipment{protected:Equipment(char*theName);public：virtual~Equipment(){}

virtualchar*Name(){returnname;}virtualint Power();virtualintPrice();virtualvoidAddChild(Equipment*);

virtulavoidRemoveChild(Equipment*);virtualvector<Equipment*>Children();private:char*name;};classFloppyDisk:publicEquipment{public：FloppyDisk(char*theName)virtual~FloppyDisk();

virtualint Power();virtualintPrice();private:char*name;};classCompositeEquipment:publicEquipment{public：CompositeEquipment(char*theName)virtual~CompositeEquipment();

virtualint Power();virtualvoidAddChild(Equipment*);

virtulavoidRemoveChild(Equipment*);virtualvector<Equipment*>Children();private:vector<Equipment*>equipments;};virtualintCompositeEquipment::Price(){

for(Iteratorit=equipments.begin();

it!=equipments.end();

++it){sum+=it->Price();

}

returnsum;}例2一個(gè)集團(tuán)公司：下設(shè)多個(gè)部門，如辦公室、財(cái)務(wù)處、基建處、人事處等