Add adapter and decorator patterns

README.md

@@ -17,10 +17,13 @@ cd java-patterns-and-constructs
 ## Da List
 ### Patterns
 * [Abstract Factory](src/main/java/com/penapereira/example/constructs/abstractfactory/)
+* [Adapter](src/main/java/com/penapereira/example/constructs/adapter/)
+* [Decorator](src/main/java/com/penapereira/example/constructs/decorator/)
 * [Factory](src/main/java/com/penapereira/example/constructs/factory/)
 * [Factory Method](src/main/java/com/penapereira/example/constructs/factorymethod/)
 * [Observer](src/main/java/com/penapereira/example/constructs/observer/)
 * [Singleton](src/main/java/com/penapereira/example/constructs/singleton/)
+* [Strategy](src/main/java/com/penapereira/example/constructs/strategy/)
 * [Template Method](src/main/java/com/penapereira/example/constructs/templatemethod/)
 ### Constructs and Problems
 * [Producer/Consumer](src/main/java/com/penapereira/example/constructs/producerconsumer/), a multi-process synchronization problem.

src/main/java/com/penapereira/example/constructs/adapter/Adaptee.java

@@ -0,0 +1,7 @@
+package com.penapereira.example.constructs.adapter;
+
+public class Adaptee {
+    public String specificRequest() {
+        return "Adaptee";
+    }
+}

src/main/java/com/penapereira/example/constructs/adapter/Adapter.java

@@ -0,0 +1,14 @@
+package com.penapereira.example.constructs.adapter;
+
+public class Adapter implements Target {
+    private final Adaptee adaptee;
+
+    public Adapter(Adaptee adaptee) {
+        this.adaptee = adaptee;
+    }
+
+    @Override
+    public String request() {
+        return "Adapter(" + adaptee.specificRequest() + ")";
+    }
+}

src/main/java/com/penapereira/example/constructs/adapter/AdapterExampleRunner.java

@@ -0,0 +1,23 @@
+package com.penapereira.example.constructs.adapter;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import com.penapereira.example.constructs.app.ExampleRunnerInterface;
+
+@Component
+public class AdapterExampleRunner implements ExampleRunnerInterface {
+
+    private static final Logger log = LoggerFactory.getLogger(AdapterExampleRunner.class);
+
+    @Override
+    public void runExample() throws Exception {
+        log.trace("Executing Adapter Pattern Implementation");
+
+        Adaptee adaptee = new Adaptee();
+        Target target = new Adapter(adaptee);
+
+        log.trace("  " + target.request());
+    }
+}

src/main/java/com/penapereira/example/constructs/adapter/Target.java

@@ -0,0 +1,5 @@
+package com.penapereira.example.constructs.adapter;
+
+public interface Target {
+    String request();
+}

src/main/java/com/penapereira/example/constructs/decorator/ComponentIF.java

@@ -0,0 +1,5 @@
+package com.penapereira.example.constructs.decorator;
+
+public interface ComponentIF {
+    String operation();
+}

src/main/java/com/penapereira/example/constructs/decorator/ConcreteComponent.java

@@ -0,0 +1,8 @@
+package com.penapereira.example.constructs.decorator;
+
+public class ConcreteComponent implements ComponentIF {
+    @Override
+    public String operation() {
+        return "ConcreteComponent";
+    }
+}

src/main/java/com/penapereira/example/constructs/decorator/ConcreteDecoratorA.java

@@ -0,0 +1,13 @@
+package com.penapereira.example.constructs.decorator;
+
+public class ConcreteDecoratorA extends Decorator {
+
+    public ConcreteDecoratorA(ComponentIF component) {
+        super(component);
+    }
+
+    @Override
+    public String operation() {
+        return "ConcreteDecoratorA(" + component.operation() + ")";
+    }
+}

src/main/java/com/penapereira/example/constructs/decorator/Decorator.java

@@ -0,0 +1,9 @@
+package com.penapereira.example.constructs.decorator;
+
+public abstract class Decorator implements ComponentIF {
+    protected final ComponentIF component;
+
+    protected Decorator(ComponentIF component) {
+        this.component = component;
+    }
+}

src/main/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunner.java

@@ -0,0 +1,25 @@
+package com.penapereira.example.constructs.decorator;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import com.penapereira.example.constructs.app.ExampleRunnerInterface;
+
+import com.penapereira.example.constructs.decorator.ComponentIF;
+
+@Component
+public class DecoratorExampleRunner implements ExampleRunnerInterface {
+
+    private static final Logger log = LoggerFactory.getLogger(DecoratorExampleRunner.class);
+
+    @Override
+    public void runExample() throws Exception {
+        log.trace("Executing Decorator Pattern Implementation");
+
+        ComponentIF component = new ConcreteComponent();
+        ComponentIF decorated = new ConcreteDecoratorA(component);
+
+        log.trace("  " + decorated.operation());
+    }
+}

src/test/java/com/penapereira/example/constructs/adapter/AdapterExampleRunnerTests.java

@@ -0,0 +1,10 @@
+package com.penapereira.example.constructs.adapter;
+
+import org.junit.jupiter.api.Test;
+
+class AdapterExampleRunnerTests {
+    @Test
+    void runExampleRuns() throws Exception {
+        new AdapterExampleRunner().runExample();
+    }
+}

src/test/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunnerTests.java

@@ -0,0 +1,10 @@
+package com.penapereira.example.constructs.decorator;
+
+import org.junit.jupiter.api.Test;
+
+class DecoratorExampleRunnerTests {
+    @Test
+    void runExampleRuns() throws Exception {
+        new DecoratorExampleRunner().runExample();
+    }
+}