中介者模式——C++实现

问题描述：

在“虚拟聊天室”实例中增加一个新的具体聊天室类和一个新的具体会员类，要求如下：

1. 新的具体聊天室中发送的图片大小不得超过20M。

2. 新的具体聊天室中发送的文字长度不得超过100个字符。

3. 新的具体会员类可以发送图片信息和文本信息。

4. 新的具体会员类在发送文本信息时，可以在信息后加上时间。

修改客户端测试类，注意原有系统类代码和客户端代码的修改。

代码：

#include<iostream>
#include<map>
#include<ctime>
#include<sstream>
using namespace std;
class AbstractChatroom;
//抽象同事类
class Member {
protected :
    AbstractChatroom *chatroom;
    string name;
public:
    Member(string name) {
        this->name=name;
    }
    AbstractChatroom* getChatroom() {
        return chatroom;
    }
    void setChatroom(AbstractChatroom *chatroom) {
        this->chatroom = chatroom;
    }
    string getName() {
        return name;
    }
    void setName(string name) {
        this->name = name;
    }
    virtual void sendText(string to,string message)=0;
    virtual void sendImage(string to,string image)=0;
    void receiveText(string from,string message) {
        cout<<from<<"发送文本给"<<this->name<<"，内容为："<<message<<endl;
    }
    void receiveImage(string from,string image) {
        cout<<from<<"发送图片给"<<this->name<<"，内容为："<<image<<endl;
    }
};
string replace(string strSrc,const string &oldStr, const string &newStr,int count=-1)
{
    string strRet=strSrc;
    size_t pos = 0;
    int l_count=0;
    if(-1 == count) //替换所有
        count = strRet.size();
    while ((pos = strRet.find(oldStr, pos)) != string::npos)
    {
        strRet.replace(pos, oldStr.size(), newStr);
        if(++l_count >= count) break;
        pos += newStr.size();
    }
    return strRet;
}
//抽象中介者类
class AbstractChatroom {
public:
    virtual void registers(Member *member)=0;
    virtual void sendText(string from,string to,string message)=0;
    virtual void sendImage(string from,string to,string image)=0;
};
//具体中介者类
class ChatGroup: public AbstractChatroom{
private:
    map<string, Member*> members;
    map<string, Member*>::iterator iter;
public:
    void registers(Member *member) {
        iter=members.find(member->getName());
        if(iter==members.end()) {
            members.insert(map<string, Member*>::value_type(member->getName(),member));
            member->setChatroom(this);
        }
    }
    void sendText(string from, string to, string message) {
        Member *member=members.find(to)->second;
        string newMessage=message;
        newMessage=replace(message,"日", "*");
        member->receiveText(from, newMessage);
    }
    void sendImage(string from, string to, string image) {
        Member *member= members.find(to)->second;
        if(image.length()>5) {
           cout<<"图片太大，发送失败"<<endl;
        }
        else {
            member->receiveImage(from, image);
        }
    }
};
//具体中介者类
class NewChat:public AbstractChatroom{
private:
    map<string, Member*> members;
    map<string, Member*>::iterator iter;
public:
    void registers(Member *member) {
       iter=members.find(member->getName());
        if(iter==members.end()) {
            members.insert(map<string, Member*>::value_type(member->getName(),member));
            member->setChatroom(this);
        }
    }
    void sendText(string from, string to, string message) {
        Member *member=members.find(to)->second;
        string newMessage=message;
        newMessage=replace(message,"日", "*");
        if(message.length()>100) {
            cout<<"发送的文字长度不得超过100个字符,发送失败"<<endl;
        }
        else {
            member->receiveText(from, newMessage);
        }
    }
    void sendImage(string from, string to, string image) {
        Member *member=members.find(to)->second;
        if(image.length()>20) {
            cout<<"图片大小不得超过20M，发送失败"<<endl;
        }
        else {
            member->receiveImage(from, image);
        }
    }
};
//具体同事类
class CommonMember :public Member{
protected :
    string name;
public:
    CommonMember(string name):Member(name) {
        this->name=name;
    }
    void sendText(string to, string message) {
        cout<<"普通会员发送消息:"<<endl;
        chatroom->sendText(this->name, to, message);
    }
 
    void sendImage(string to, string image) {
        cout<<"普通会员不能发送图片！"<<endl;
    }
};
//具体同事类
class DiamondMember :public Member{
protected :
    string name;
public:
    DiamondMember(string name):Member(name){
        this->name=name;
        }
    void sendText(string to, string message) {
        cout<<"钻石会员发送消息:"<<endl;
        chatroom->sendText(name,to, message);
    }
    void sendImage(string to, string image) {
        cout<<"钻石会员发送图片:"<<endl;
        chatroom->sendImage(name, to, image);
    }
};
//具体同事类
class NewMember :public Member{
protected :
    string name;
public:
    NewMember(string name):Member(name){
        this->name=name;
    }
    void sendText(string to, string message) {
        time_t now = time(NULL);
        tm* t = localtime(&now);
        // 将信息输出到字符串流
        stringstream ss;
        stringstream ss2;
        ss << t->tm_year + 1900 << "." << t->tm_mon + 1 << "." <<
            t->tm_mday << ".." << t->tm_hour << "." << t->tm_min << "." << t->tm_sec;
        cout<<"新会员发送消息:"<<endl;
        chatroom->sendText(name,to,message+"  现在时间"+ss.str());
    }
    void sendImage(string to, string image) {
        cout<<"会员发送图片:"<<endl;
        chatroom->sendImage(name, to, image);
    }
};
//测试函数
int main(){
        AbstractChatroom *newChat=new NewChat();
        Member *member1,*member2,*member3,*member4;
        member1=new DiamondMember("张三");
        member2=new CommonMember("小李");
        member3=new NewMember("小芳");
        member4=new NewMember("小红");
 
        newChat->registers(member1);
        newChat->registers(member2);
        newChat->registers(member3);
        newChat->registers(member4);
 
        member1->sendText("小李","小李，你好！");
        member2->sendText("张三","张三，你好！");
        cout<<"---------------------------------------------"<<endl;
        member3->sendText("小红","小红你好。");
        member3->sendText("小红","你好小红!-----------------------------------------------------------------------------------------------------");
        member3->sendImage("小红","哈哈.jpg");
        member4->sendText("小芳","你好，小芳");
        member4->sendImage("小芳","哈哈.jpg--------------------");
}

　　运行截图：