软件设计组合模式

组合模式
用透明组合模式实现教材中的“文件夹浏览”这个例子。

类图

java

package rjsj.no10;

public class Client {
    public static void main(String[] args) {
        AbstractFile obj1,obj2,obj3,obj4,obj5;
        Folder plate1,plate2,plate3;
        obj1 = new ImageFile("图片文件1");
        obj2 = new TextFile("文本文件1");
        plate1 = new Folder("父文件夹1");
        plate1.add(obj1);
        plate1.add(obj2);

        obj3 = new VideoFile("视频文件1");
        obj4 = new Folder("子文件夹1");
        plate2 = new Folder("父文件夹2");
        plate2.add(obj3);
        plate2.add(obj4);

        obj5 = new TextFile("文本文件2");
        plate3 = new Folder("父文件夹3");
        plate3.add(obj5);
        plate3.add(plate1);
        plate3.add(plate2);

        plate3.display();

    }
}

package rjsj.no10;

import java.util.ArrayList;

public class Folder extends AbstractFile{
    private String fileName;
    private ArrayList fileList=new ArrayList();
    public Folder(String filename) {
        this.fileName=new String();
        this.fileName=filename;
    }

    @Override
    public void add(AbstractFile element) {
        fileList.add(element);
        System.out.println("新建文件夹");
    }

    @Override
    public void remove(AbstractFile element) {
        fileList.remove(element);
        System.out.println("删除文件夹");
    }

    @Override
    public void display() {
        for (Object obj:fileList){
            ((AbstractFile)obj).display();
        }
        System.out.println("打开文件夹");
    }
}

package rjsj.no10;

public class ImageFile extends AbstractFile{
    private String fileName;
    public ImageFile(String filename) {
        this.fileName=new String();
        this.fileName=filename;
    }

    @Override
    public void add(AbstractFile element) {
        System.out.println("添加图片文件");
    }

    @Override
    public void remove(AbstractFile element) {
        System.out.println("移除图片文件");
    }

    @Override
    public void display() {
        System.out.println(fileName);
        System.out.println("打开图片文件");
    }
}

package rjsj.no10;

public class TextFile extends AbstractFile{
    private String fileName;
    public TextFile(String filename) {
        this.fileName=new String();
        this.fileName=filename;
    }

    @Override
    public void add(AbstractFile element) {
        System.out.println("添加文本文件");
    }

    @Override
    public void remove(AbstractFile element) {
        System.out.println("移除文本文件");
    }

    @Override
    public void display() {
        System.out.println(fileName);
        System.out.println("打开文本文件");
    }
}

package rjsj.no10;

public class VideoFile extends AbstractFile{

    private String fileName;
    public VideoFile(String filename) {
        this.fileName=new String();
        this.fileName=filename;
    }

    @Override
    public void add(AbstractFile element) {
        System.out.println("添加视频文件");
    }

    @Override
    public void remove(AbstractFile element) {
        System.out.println("移除视频文件");
    }

    @Override
    public void display() {
        System.out.println(fileName);
        System.out.println("播放视频文件");
    }
}

package rjsj.no10;

public abstract class AbstractFile {
    public abstract void add(AbstractFile element);
    public abstract void remove(AbstractFile element);
    public abstract void display();

}

C++

#include<iostream>
#include<string>
#include<list>
using namespace std;

class AbstractFile {
public:
    virtual void add(AbstractFile* element) = 0;
    virtual void remove(AbstractFile* element) = 0;
    virtual void display() = 0;
};

class VideoFile : public AbstractFile {
private:
    string fileName;
public:
    VideoFile(string fileName) {
        this->fileName = fileName;
    }
    void add(AbstractFile* element) {
        cout << "打开VideoFile" << endl;
    }
    void remove(AbstractFile* element) {
        cout << "关闭VideoFile" << endl;
    }
    void display() {
        cout << "浏览VideoFile" << endl;
    }
    void displayFile() {
        cout << "VideoFile的内容" << endl;
    }

};

class TextFile :public AbstractFile {
private:
    string fileName;
public:
    TextFile(string fileName) {
        this->fileName = fileName;
    }
    void add(AbstractFile* element) {
        cout << "打开" <<this->fileName<< endl;
    }
    void remove(AbstractFile* element) {
        cout << "关闭" << this->fileName<<endl;
    }
    void display() {
        cout << "浏览" << this->fileName<<endl;
    }
    void displayFile() {
        cout <<this->fileName<< "的内容" << endl;
    }
};

class ImageFile :public AbstractFile {
private:
    string fileName;
public:
    ImageFile(string fileName) {
        this->fileName = fileName;
    }
    void add(AbstractFile* element) {
        cout << "打开" <<this->fileName<< endl;
    }
    void remove(AbstractFile* element) {
        cout << "关闭"<<this->fileName << endl;
    }
    void display() {
        cout << "浏览"<<this->fileName << endl;
    }
    void displayFile() {
        cout <<this->fileName<< "的内容" << endl;
    }
};

class Folder :public AbstractFile {
private:
    list<AbstractFile*>* _list;
    string fileName;
public:
    Folder(string fileName) {
        this->fileName = fileName;
        _list = new list<AbstractFile*>;
    }
    ~Folder() {
        if (_list != NULL)
        {
            while (_list->empty()) {
                delete *(_list->begin());
                _list->erase(_list->begin());
            }
            delete _list;
        }
    }
    string getFileName() const {
        return fileName;
    }
    void add(AbstractFile* element) {
        _list->push_back(element);
    }
    void remove(AbstractFile* element) {
        cout << "关闭"<<this->fileName;
        _list->remove(element);
    }
    void display() {
        if (_list != NULL) {
            list<AbstractFile*>::iterator it = _list->begin();
            while (it != _list->end()) {
                (*it++)->display();
            }
        }
    }
};

int main() {
    AbstractFile *obj1, *obj2, *obj3, *obj4;
    Folder *plate1, *plate2;

    obj1 = new ImageFile("ImageFile");
    obj2 = new TextFile("TextFile");
    plate1 = new Folder("folder1");
    cout << "打开Folder1";
    plate1->add(obj1);
    plate1->add(obj2);
    plate1->display();
    obj3 = new VideoFile("VideoFile");
    cout << "打开Folder2";
    plate2 = new Folder("folder2");
    plate2->add(obj3);
    plate2->display();
    plate1->remove(obj1);
    plate1->remove(obj3);
}

运行截图