From e88c5776c8733daabc1c5b8e5f93845bca329462 Mon Sep 17 00:00:00 2001
From: Luis <lpenap@gmail.com>
Date: Mon, 16 Jun 2025 10:30:01 -0300
Subject: [PATCH] Add Adapter and Decorator pattern examples

---
 README.md                                     |  3 +++
 .../example/constructs/adapter/Adaptee.java   |  7 ++++++
 .../example/constructs/adapter/Adapter.java   | 14 +++++++++++
 .../adapter/AdapterExampleRunner.java         | 23 +++++++++++++++++
 .../example/constructs/adapter/Target.java    |  5 ++++
 .../constructs/decorator/ComponentIF.java     |  5 ++++
 .../decorator/ConcreteComponent.java          |  8 ++++++
 .../decorator/ConcreteDecoratorA.java         | 13 ++++++++++
 .../constructs/decorator/Decorator.java       |  9 +++++++
 .../decorator/DecoratorExampleRunner.java     | 25 +++++++++++++++++++
 .../adapter/AdapterExampleRunnerTests.java    | 10 ++++++++
 .../DecoratorExampleRunnerTests.java          | 10 ++++++++
 12 files changed, 132 insertions(+)
 create mode 100644 src/main/java/com/penapereira/example/constructs/adapter/Adaptee.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/adapter/Adapter.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/adapter/AdapterExampleRunner.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/adapter/Target.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/decorator/ComponentIF.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/decorator/ConcreteComponent.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/decorator/ConcreteDecoratorA.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/decorator/Decorator.java
 create mode 100644 src/main/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunner.java
 create mode 100644 src/test/java/com/penapereira/example/constructs/adapter/AdapterExampleRunnerTests.java
 create mode 100644 src/test/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunnerTests.java

diff --git a/README.md b/README.md
index 2ebd480..d046e0c 100644
--- a/README.md
+++ b/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.
diff --git a/src/main/java/com/penapereira/example/constructs/adapter/Adaptee.java b/src/main/java/com/penapereira/example/constructs/adapter/Adaptee.java
new file mode 100644
index 0000000..93a76be
--- /dev/null
+++ b/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";
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/adapter/Adapter.java b/src/main/java/com/penapereira/example/constructs/adapter/Adapter.java
new file mode 100644
index 0000000..fd50fa2
--- /dev/null
+++ b/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() + ")";
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/adapter/AdapterExampleRunner.java b/src/main/java/com/penapereira/example/constructs/adapter/AdapterExampleRunner.java
new file mode 100644
index 0000000..5ab0436
--- /dev/null
+++ b/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());
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/adapter/Target.java b/src/main/java/com/penapereira/example/constructs/adapter/Target.java
new file mode 100644
index 0000000..8943acd
--- /dev/null
+++ b/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();
+}
diff --git a/src/main/java/com/penapereira/example/constructs/decorator/ComponentIF.java b/src/main/java/com/penapereira/example/constructs/decorator/ComponentIF.java
new file mode 100644
index 0000000..c8822bd
--- /dev/null
+++ b/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();
+}
diff --git a/src/main/java/com/penapereira/example/constructs/decorator/ConcreteComponent.java b/src/main/java/com/penapereira/example/constructs/decorator/ConcreteComponent.java
new file mode 100644
index 0000000..b2f5988
--- /dev/null
+++ b/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";
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/decorator/ConcreteDecoratorA.java b/src/main/java/com/penapereira/example/constructs/decorator/ConcreteDecoratorA.java
new file mode 100644
index 0000000..df27b9c
--- /dev/null
+++ b/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() + ")";
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/decorator/Decorator.java b/src/main/java/com/penapereira/example/constructs/decorator/Decorator.java
new file mode 100644
index 0000000..0236227
--- /dev/null
+++ b/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;
+    }
+}
diff --git a/src/main/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunner.java b/src/main/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunner.java
new file mode 100644
index 0000000..9316a9e
--- /dev/null
+++ b/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());
+    }
+}
diff --git a/src/test/java/com/penapereira/example/constructs/adapter/AdapterExampleRunnerTests.java b/src/test/java/com/penapereira/example/constructs/adapter/AdapterExampleRunnerTests.java
new file mode 100644
index 0000000..58e73d2
--- /dev/null
+++ b/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();
+    }
+}
diff --git a/src/test/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunnerTests.java b/src/test/java/com/penapereira/example/constructs/decorator/DecoratorExampleRunnerTests.java
new file mode 100644
index 0000000..675a8f0
--- /dev/null
+++ b/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();
+    }
+}