Implement Facade Pattern

Design Patterns/src/facade/Amplifier.java

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+package facade;
+
+public class Amplifier {
+
+    private final String description;
+    private Tuner tuner;
+    private DVDPlayer dvd;
+    private CDPlayer cd;
+    private int volume;
+
+    public Amplifier(String description) {
+        this.description = description;
+    }
+
+    public void on() {
+        System.out.println(description + " is On");
+    }
+
+    public void off() {
+        System.out.println(description + " is Off");
+    }
+
+    public void setSurroundSound() {
+        System.out.println(description + " Surround Sound enabled");
+    }
+
+    public void setStereoSound() {
+        System.out.println(description + " Stereo Mode enabled");
+    }
+
+    public void setTuner(Tuner tuner) {
+        this.tuner = tuner;
+    }
+
+    public void setDvd(DVDPlayer dvd) {
+        this.dvd = dvd;
+    }
+
+    public void setCd(CDPlayer cd) {
+        this.cd = cd;
+    }
+
+    public void setVolume(int volume) {
+        this.volume = volume;
+    }
+}

Design Patterns/src/facade/CDPlayer.java

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+package facade;
+
+public class CDPlayer {
+
+    private final String description;
+    private int currentTrack;
+    private final Amplifier amplifier;
+    private String title;
+
+    public CDPlayer(String description, Amplifier amplifier) {
+        this.description = description;
+        this.amplifier = amplifier;
+    }
+
+    public void on() {
+        System.out.println(description + " on");
+    }
+
+    public void off() {
+        System.out.println(description + " off");
+    }
+
+    public void eject() {
+        title = null;
+        System.out.println(description + " eject");
+    }
+
+    public void play(String title) {
+        this.title = title;
+        currentTrack = 0;
+        System.out.println(description + " playing \"" + title + "\"");
+    }
+
+    public void play(int track) {
+        if (title == null) {
+            System.out.println(description + " can't play track " + currentTrack +
+                    ", no cd inserted");
+        } else {
+            currentTrack = track;
+            System.out.println(description + " playing track " + currentTrack);
+        }
+    }
+
+    public void stop() {
+        currentTrack = 0;
+        System.out.println(description + " stopped");
+    }
+
+    public void pause() {
+        System.out.println(description + " paused \"" + title + "\"");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/DVDPlayer.java

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+package facade;
+
+public class DVDPlayer {
+
+    private final String description;
+    private int currentTrack;
+    private Amplifier amplifier;
+    private String movie;
+
+    public DVDPlayer(String description, Amplifier amplifier) {
+        this.description = description;
+        this.amplifier = amplifier;
+    }
+
+    public void on() {
+        System.out.println(description + " on");
+    }
+
+    public void off() {
+        System.out.println(description + " off");
+    }
+
+    public void eject() {
+        movie = null;
+        System.out.println(description + " eject");
+    }
+
+    public void play(String movie) {
+        this.movie = movie;
+        currentTrack = 0;
+        System.out.println(description + " playing \"" + movie + "\"");
+    }
+
+    public void play(int track) {
+        if (movie == null) {
+            System.out.println(description + " can't play track " + track + " no dvd inserted");
+        } else {
+            currentTrack = track;
+            System.out.println(description + " playing track " + currentTrack + " of \"" + movie + "\"");
+        }
+    }
+
+    public void stop() {
+        currentTrack = 0;
+        System.out.println(description + " stopped \"" + movie + "\"");
+    }
+
+    public void pause() {
+        System.out.println(description + " paused \"" + movie + "\"");
+    }
+
+    public void setTwoChannelAudio() {
+        System.out.println(description + " set two channel audio");
+    }
+
+    public void setSurroundAudio() {
+        System.out.println(description + " set surround audio");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/HomeTheaterFacade.java

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+package facade;
+
+public class HomeTheaterFacade {
+    private final Amplifier amp;
+    private final Tuner tuner;
+    private final DVDPlayer dvd;
+    private final CDPlayer cd;
+    private final Projector projector;
+    private final TheaterLights lights;
+    private final Screen screen;
+    private final PopcornPopper popper;
+
+    public HomeTheaterFacade(Amplifier amp, Tuner tuner, DVDPlayer dvd, CDPlayer cd, Projector projector, Screen screen, TheaterLights lights, PopcornPopper popper) {
+        this.amp = amp;
+        this.tuner = tuner;
+        this.dvd = dvd;
+        this.cd = cd;
+        this.projector = projector;
+        this.screen = screen;
+        this.lights = lights;
+        this.popper = popper;
+    }
+
+    public void watchMovie(String movie) {
+        System.out.println("Get ready to watch a movie...");
+        popper.on();
+        popper.pop();
+        lights.dim(10);
+        screen.down();
+        projector.on();
+        projector.wideScreenMode();
+        amp.on();
+        amp.setDvd(dvd);
+        amp.setSurroundSound();
+        amp.setVolume(5);
+        dvd.on();
+        dvd.play(movie);
+    }
+
+    public void endMovie() {
+        System.out.println("Shutting movie theater down...");
+        popper.off();
+        lights.on();
+        screen.up();
+        projector.off();
+        amp.off();
+        dvd.stop();
+        dvd.eject();
+        dvd.off();
+    }
+
+    public void listenToCd(String cdTitle) {
+        System.out.println("Get ready for an audiopile experence...");
+        lights.on();
+        amp.on();
+        amp.setVolume(5);
+        amp.setCd(cd);
+        amp.setStereoSound();
+        cd.on();
+        cd.play(cdTitle);
+    }
+
+    public void endCd() {
+        System.out.println("Shutting down CD...");
+        amp.off();
+        amp.setCd(cd);
+        cd.eject();
+        cd.off();
+    }
+
+    public void listenToRadio(double frequency) {
+        System.out.println("Tuning in the airwaves...");
+        tuner.on();
+        tuner.setFrequency(frequency);
+        amp.on();
+        amp.setVolume(5);
+        amp.setTuner(tuner);
+    }
+
+    public void endRadio() {
+        System.out.println("Shutting down the tuner...");
+        tuner.off();
+        amp.off();
+    }
+}

Design Patterns/src/facade/Main.java

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+package facade;
+
+public class Main {
+    public static void main(String[] args) {
+
+        Amplifier amp = new Amplifier("Top-O-Line Amplifier");
+        Tuner tuner = new Tuner("Top-O-Line AM/FM Tuner");
+        DVDPlayer dvd = new DVDPlayer("Top-O-Line DVD Player", amp);
+        CDPlayer cd = new CDPlayer("Top-O-Line CD Player", amp);
+        Projector projector = new Projector("Top-O-Line Projector", dvd);
+        TheaterLights lights = new TheaterLights("Theater Ceiling Lights");
+        Screen screen = new Screen("Theater Screen");
+        PopcornPopper popper = new PopcornPopper("Popcorn Popper");
+
+        HomeTheaterFacade homeTheater = new HomeTheaterFacade(amp, tuner, dvd, cd, projector, screen, lights, popper);
+
+        homeTheater.watchMovie("Raiders of the Lost Ark");
+        System.out.println("\n");
+        homeTheater.endMovie();
+    }
+}

Design Patterns/src/facade/PopcornPopper.java

@@ -0,0 +1,26 @@
+package facade;
+
+public class PopcornPopper {
+    private final String description;
+
+    public PopcornPopper(String description) {
+        this.description = description;
+    }
+
+    public void on() {
+        System.out.println(description + " On");
+    }
+
+    public void off() {
+        System.out.println(description + " Off");
+    }
+
+    public void pop() {
+        System.out.println(description + " popping popcorn!");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/Projector.java

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+package facade;
+
+public class Projector {
+    private final String description;
+    private final DVDPlayer dvdPlayer;
+
+    public Projector(String description, DVDPlayer dvdPlayer) {
+        this.description = description;
+        this.dvdPlayer = dvdPlayer;
+    }
+
+    public void on() {
+        System.out.println(description + " On");
+    }
+
+    public void off() {
+        System.out.println(description + " Off");
+    }
+
+    public void wideScreenMode() {
+        System.out.println(description + " in Widescreen Mode (16x9 Aspect Ratio)");
+    }
+
+    public void tvMode() {
+        System.out.println(description + " in TV Mode (4x3 Aspect Ratio)");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/Screen.java

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+package facade;
+
+public class Screen {
+    private final String description;
+
+    public Screen(String description) {
+        this.description = description;
+    }
+
+    public void up() {
+        System.out.println(description + " going up");
+    }
+
+    public void down() {
+        System.out.println(description + " going down");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/TheaterLights.java

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+package facade;
+
+public class TheaterLights {
+    private final String description;
+
+    public TheaterLights(String description) {
+        this.description = description;
+    }
+
+    public void on() {
+        System.out.println(description + " on");
+    }
+
+    public void off() {
+        System.out.println(description + " off");
+    }
+
+    public void dim(int level) {
+        System.out.println(description + " dimming to " + level  + "%");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}

Design Patterns/src/facade/Tuner.java

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+package facade;
+
+public class Tuner {
+    private final String description;
+    private Amplifier amplifier;
+    private double frequency;
+
+    public Tuner(String description) {
+        this.description = description;
+    }
+
+    public void on() {
+        System.out.println(description + " on");
+    }
+
+    public void off() {
+        System.out.println(description + " off");
+    }
+
+    public void setFrequency(double frequency) {
+        System.out.println(description + " setting frequency to " + frequency);
+        this.frequency = frequency;
+    }
+
+    public void setAm() {
+        System.out.println(description + " setting AM mode");
+    }
+
+    public void setFm() {
+        System.out.println(description + " setting FM mode");
+    }
+
+    @Override
+    public String toString() {
+        return description;
+    }
+}