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component/src/main/java/com/iluwater/component/App.java

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+/*
+ * The MIT License
+ * Copyright © 2014-2019 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 
+package com.iluwater.component;
+
+import java.util.ArrayList;
+/*
+ * Object-oriented to a certain extent can solve many problems of code reuse and data reuse,
+ * but it also has great defects:
+ * 1.the coupling of data organization is very strong.
+ * 2.Interface logic is difficult to reuse and hot plug.
+ *
+ * The component pattern solves the defects of object orientation and process orientation and
+ * is widely used in game clients
+ *
+ * A component is a part of one object. We can consider that a object contains multiple
+ * components, in another way, multiple components can construct a object.
+ * Here is a demo using component pattern to solve a game-like problem.
+ * A person named Bjorn who has three component: get input;judge physics state;show graphics state
+ * These three component with a common game object can construct our protagonist:Bjorn, also can
+ * construct other objects like dog or cat if you want to write a real game.
+ */
+
+public class App {
+    public static void main(String[] args) {
+        ArrayList<Component>arrayList = new ArrayList<>();
+        arrayList.add(new BjornInputComponent());
+        arrayList.add(new BjornPhysicsComponent());
+        arrayList.add(new BjornGraphicsComponent());
+        GameObject gameObject = new GameObject(arrayList);
+        gameObject.update();
+    }
+}

component/src/main/java/com/iluwater/component/BjornGraphicsComponent.java

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+package com.iluwater.component;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.slf4j.Logger;
+
+public class BjornGraphicsComponent implements GraphicsComponent {
+    private static final Logger LOGGER = getLogger(BjornGraphicsComponent.class);
+
+    @Override
+    public void update(GameObject gameObject) {
+        LOGGER.info("positive:" + gameObject.getPositionOFx() + "," + gameObject.getPositionOFy());
+    }
+}

component/src/main/java/com/iluwater/component/BjornInputComponent.java

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+package com.iluwater.component;
+
+
+public class BjornInputComponent implements InputComponent {
+
+    @Override
+    public void update(GameObject gameObject) {
+        gameObject.setPositionOFx(gameObject.getPositionOFx() + gameObject.getVelocity());
+        gameObject.setPositionOFy(gameObject.getPositionOFy() + gameObject.getVelocity());
+    }
+}

component/src/main/java/com/iluwater/component/BjornPhysicsComponent.java

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+package com.iluwater.component;
+
+import static org.slf4j.LoggerFactory.getLogger;
+import org.slf4j.Logger;
+
+
+public class BjornPhysicsComponent implements PhysicsComponent{
+
+    private static final Logger LOGGER = getLogger(BjornPhysicsComponent.class);
+
+    @Override
+    public void update(GameObject gameObject) {
+        if(gameObject.getPositionOFx() == gameObject.getPositionOFy()){
+            LOGGER.info("Your position is pretty good, keep it!");
+        }
+    }
+}

component/src/main/java/com/iluwater/component/Component.java

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+package com.iluwater.component;
+
+public interface Component {
+
+    void update(GameObject gameObject);
+}

component/src/main/java/com/iluwater/component/GameObject.java

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+package com.iluwater.component;
+
+import java.util.ArrayList;
+
+public class GameObject {
+    public int velocity;
+    public int positionOFx;
+    public int positionOFy;
+    ArrayList<Component> componentArrayList;
+    public GameObject(ArrayList<Component> componentArrayList){
+        this.componentArrayList = componentArrayList;
+    }
+
+    public void setVelocity(int velocity) {
+        this.velocity = velocity;
+    }
+
+    public int getVelocity() {
+        return velocity;
+    }
+
+    public void setPositionOFx(int positionOFx) {
+        this.positionOFx = positionOFx;
+    }
+
+    public int getPositionOFx() {
+        return positionOFx;
+    }
+
+    public void setPositionOFy(int positionOFy) {
+        this.positionOFy = positionOFy;
+    }
+
+    public int getPositionOFy() {
+        return positionOFy;
+    }
+
+    public void update(){
+        for (Component component : componentArrayList) {
+            component.update(this);
+        }
+    }
+}

component/src/main/java/com/iluwater/component/GraphicsComponent.java

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+package com.iluwater.component;
+
+public interface GraphicsComponent extends Component{
+
+    void update(GameObject gameObject);
+}

component/src/main/java/com/iluwater/component/InputComponent.java

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+package com.iluwater.component;
+
+public interface InputComponent extends Component {
+
+    void update(GameObject gameObject);
+}

component/src/main/java/com/iluwater/component/PhysicsComponent.java

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+package com.iluwater.component;
+
+public interface PhysicsComponent extends Component {
+
+    void update(GameObject gameObject);
+}