设计模式-行为型-中介者模式-Mediator

同事抽象类

public abstract class Colleague {
    private Mediator mediator;

    public abstract void play(String data);
}

视频同事

public class AudioColleague extends Colleague {
    public void play(String data) {
        System.out.println("画外音是：" + data);
    }
}

光驱同事

public class CdColleague extends Colleague {
    private String data = "";

    public void play(String data) {
        this.data = data;
        System.out.println("从cd中读取数据：" + data);
        getMediator().change(this);
    }
}

处理器同事

public class CpuColleague extends Colleague {
    private String videoData = "";//读取出来的视频数据
    private String audioData = "";//读取出来的音频数据

    public void play(String data) {//处理数据
        String[] split = data.split(",");
        this.videoData = split[0];
        this.audioData = split[1];

        System.out.println("从cpu中读取视频：" + videoData);
        System.out.println("从cpu中读取音频：" + audioData);

        getMediator().change(this);
    }
}

声音同事

public class VideColleague extends Colleague {
    public void play(String data) {
        System.out.println("您正在观看的是：" + data);
    }
}

中介者接口

public interface Mediator { void change(Colleague c); }

主板中介者类

public class MainBoardMediator implements Mediator {
    private Colleague cd;
    private Colleague cpu;
    private Colleague video;
    private Colleague audio;

    @Override
    public void change(Colleague c) {
        if (c instanceof CdColleague) {
            afterCdReadData((CdColleague) c);
        } else if (c instanceof CpuColleague) {
            afterCpuReadData((CpuColleague) c);
        }
    }

    private void afterCdReadData(CdColleague cd) {//光驱读取数据后与其他对象交互
        String data = cd.getData();
        cpu.play(data);
    }

    private void afterCpuReadData(CpuColleague cd) {//cpu读取数据后与其他对象交互
        String videoData = cd.getVideoData();
        String audioData = cd.getAudioData();

        video.play(videoData);
        audio.play(audioData);
    }
}

演示类

public class Demo {
    public static void main(String[] args) {
        MainBoardMediator mediator = new MainBoardMediator();

        Colleague audio = new AudioColleague(mediator);
        Colleague cd = new CdColleague(mediator);
        Colleague cpu = new CpuColleague(mediator);
        Colleague video = new VideColleague(mediator);

        mediator.setAudio(audio);
        mediator.setCd(cd);
        mediator.setCpu(cpu);
        mediator.setVideo(video);

        cd.play("CCTV,天气预报");
    }
}

演示结果