Add support for Inject

pippo-controller-parent/pippo-controller/pom.xml

@@ -39,6 +39,14 @@
             <scope>provided</scope>
         </dependency>
 
+        <!-- Inject (DI) -->
+        <dependency>
+            <groupId>javax.inject</groupId>
+            <artifactId>javax.inject</artifactId>
+            <version>1</version>
+            <scope>provided</scope>
+        </dependency>
+
         <!-- Test -->
         <dependency>
             <groupId>junit</groupId>

pippo-controller-parent/pippo-controller/src/main/java/ro/pippo/controller/ControllerApplication.java

@@ -20,33 +20,38 @@
 import ro.pippo.core.Application;
 import ro.pippo.core.PippoSettings;
 
+import javax.inject.Inject;
+import java.util.Optional;
+
 /**
  * @author Decebal Suiu
  */
 public class ControllerApplication extends Application {
 
     private static final Logger log = LoggerFactory.getLogger(ControllerApplication.class);
 
-    private ControllerRouteFactory controllerRouteFactory;
+    @Inject
+    private Optional<ControllerRouteFactory> controllerRouteFactory = Optional.empty();
 
     public ControllerApplication() {
         super();
     }
 
+    @Inject
     public ControllerApplication(PippoSettings settings) {
         super(settings);
     }
 
     public ControllerRouteFactory getControllerRouteFactory() {
-        if (controllerRouteFactory == null) {
-            controllerRouteFactory = new DefaultControllerRouteFactory().setContentTypeEngines(getContentTypeEngines());
+        if (!controllerRouteFactory.isPresent()) {
+            controllerRouteFactory = Optional.of(new DefaultControllerRouteFactory().setContentTypeEngines(getContentTypeEngines()));
         }
 
-        return controllerRouteFactory;
+        return controllerRouteFactory.get();
     }
 
     public ControllerApplication setControllerRouteFactory(ControllerRouteFactory controllerRouteFactory) {
-        this.controllerRouteFactory = controllerRouteFactory;
+        this.controllerRouteFactory = Optional.of(controllerRouteFactory);
         log.debug("Controller route factory is '{}'", controllerRouteFactory.getClass().getName());
 
         return this;

pippo-core/pom.xml

@@ -29,6 +29,14 @@
             <version>${slf4j.version}</version>
         </dependency>
 
+        <!-- Inject (DI) -->
+        <dependency>
+            <groupId>javax.inject</groupId>
+            <artifactId>javax.inject</artifactId>
+            <version>1</version>
+            <scope>provided</scope>
+        </dependency>
+
         <!-- Test -->
         <dependency>
             <groupId>junit</groupId>

pippo-core/src/main/java/ro/pippo/core/AbstractTemplateEngine.java

@@ -20,6 +20,8 @@
 
 import java.util.Locale;
 
+import javax.inject.Inject;
+
 /**
  * Convenience abstract implementation of {@link TemplateEngine}.
  *
@@ -44,6 +46,7 @@ public abstract class AbstractTemplateEngine implements TemplateEngine {
      *                     and other settings for the initialization
      */
     @Override
+    @Inject
     public final void init(Application application) {
         this.application = application;
     }