BAEL-1349: Custom plugin added to Gradle (#3145)

gradle/plugin/build.gradle

@@ -0,0 +1,14 @@
+  repositories{
+      mavenCentral()
+  }
+  apply plugin: 'java'
+  apply plugin: 'maven'
+  apply plugin: com.baeldung.GreetingPlugin
+  dependencies {
+      compile gradleApi()
+  }
+
+  greeting {
+      greeter = "Stranger"
+      message = "Message from the build script!"
+  }

gradle/plugin/buildSrc/src/main/java/com/baeldung/GreetingPlugin.java

@@ -0,0 +1,17 @@
+package com.baeldung;
+
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+
+public class GreetingPlugin implements Plugin<Project> {
+    @Override
+    public void apply(Project project) {
+
+        GreetingPluginExtension extension = project.getExtensions().create("greeting", GreetingPluginExtension.class);
+
+        project.task("hello").doLast(task -> {
+            System.out.println("Hello, " + extension.getGreeter());
+            System.out.println("I have a message for You: " + extension.getMessage()); }
+        );
+    }
+}

gradle/plugin/buildSrc/src/main/java/com/baeldung/GreetingPluginExtension.java

@@ -0,0 +1,22 @@
+package com.baeldung;
+
+public class GreetingPluginExtension {
+    private String greeter = "Baeldung";
+    private String message = "Message from Plugin!";
+
+    public String getGreeter() {
+        return greeter;
+    }
+
+    public void setGreeter(String greeter) {
+        this.greeter = greeter;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}