Merge "Add Mycilla code to odlguice"

[odlguice.git] / inject / inject-guice-extensions / injection / src / main / java / org / opendaylight / odlguice / inject / guice / extensions / injection / FieldHandlerTypeListener.java

diff --git a/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/FieldHandlerTypeListener.java b/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/FieldHandlerTypeListener.java
new file mode 100755 (executable)
index 0000000..5b2f57a
--- /dev/null
+++ b/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/FieldHandlerTypeListener.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2010 Mycila (mathieu.carbou@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.opendaylight.odlguice.inject.guice.extensions.injection;
+
+import com.google.common.collect.Lists;
+import com.google.inject.Provider;
+import com.google.inject.TypeLiteral;
+import com.google.inject.spi.InjectionListener;
+import com.google.inject.spi.TypeEncounter;
+import com.google.inject.spi.TypeListener;
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.util.List;
+
+/**
+ * This code originated in https://github.com/mycila/guice and was forked into
+ * OpenDaylight.
+ * @author Mathieu Carbou (mathieu.carbou@gmail.com)
+ */
+public class FieldHandlerTypeListener<A extends Annotation> implements TypeListener {
+    private final Class<A> annotationType;
+    private final Class<? extends FieldHandler<A>> handlerClass;
+
+    public FieldHandlerTypeListener(Class<A> annotationType, Class<? extends FieldHandler<A>> handlerClass) {
+        this.annotationType = annotationType;
+        this.handlerClass = handlerClass;
+    }
+
+    @Override
+    public <I> void hear(final TypeLiteral<I> type, TypeEncounter<I> encounter) {
+        final Provider<? extends FieldHandler<A>> provider = encounter.getProvider(handlerClass);
+        final List<Field> fields = Lists
+                .newLinkedList(Reflect.findAllAnnotatedFields(type.getRawType(), annotationType));
+        if (!fields.isEmpty()) {
+            encounter.register(new InjectionListener<I>() {
+                @Override
+                public void afterInjection(I injectee) {
+                    FieldHandler<A> handler = provider.get();
+                    for (Field field : fields) {
+                        handler.handle(type, injectee, field, field.getAnnotation(annotationType));
+                    }
+                }
+            });
+        }
+    }
+}