BAEL-2836 Mediator Pattern in Java

2019-03-25 21:15:34 +01:00
parent fda8a29eb6
commit 52587443de
5 changed files with 121 additions and 0 deletions
@@ -0,0 +1,13 @@
+package com.baeldung.mediator;
+
+public class Button {
+    private Mediator mediator;
+
+    public void setMediator(Mediator mediator) {
+        this.mediator = mediator;
+    }
+
+    public void press() {
+        this.mediator.press();
+    }
+}
@@ -0,0 +1,24 @@
+package com.baeldung.mediator;
+
+public class Fan {
+    private Mediator mediator;
+    private boolean isOn = false;
+
+    public void setMediator(Mediator mediator) {
+        this.mediator = mediator;
+    }
+
+    public boolean isOn() {
+        return isOn;
+    }
+
+    public void turnOn() {
+        this.mediator.start();
+        isOn = true;
+    }
+
+    public void turnOff() {
+        isOn = false;
+        this.mediator.stop();
+    }
+}
@@ -0,0 +1,37 @@
+package com.baeldung.mediator;
+
+public class Mediator {
+    private Button button;
+    private Fan fan;
+    private PowerSupplier powerSupplier;
+
+    public void setButton(Button button) {
+        this.button = button;
+        this.button.setMediator(this);
+    }
+
+    public void setFan(Fan fan) {
+        this.fan = fan;
+        this.fan.setMediator(this);
+    }
+
+    public void setPowerSupplier(PowerSupplier powerSupplier) {
+        this.powerSupplier = powerSupplier;
+    }
+
+    public void press() {
+        if (fan.isOn()) {
+            fan.turnOff();
+        } else {
+            fan.turnOn();
+        }
+    }
+
+    public void start() {
+        powerSupplier.turnOn();
+    }
+
+    public void stop() {
+        powerSupplier.turnOff();
+    }
+}
@@ -0,0 +1,11 @@
+package com.baeldung.mediator;
+
+public class PowerSupplier {
+    public void turnOn() {
+        // implementation
+    }
+
+    public void turnOff() {
+        // implementation
+    }
+}