Add Mycilla code to odlguice

[odlguice.git] / inject / inject-guice-extensions / jsr250 / src / main / java / org / opendaylight / odlguice / inject / guice / extensions / jsr250 / Jsr250KeyProvider.java

diff --git a/inject/inject-guice-extensions/jsr250/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/jsr250/Jsr250KeyProvider.java b/inject/inject-guice-extensions/jsr250/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/jsr250/Jsr250KeyProvider.java
new file mode 100755 (executable)
index 0000000..1cf774e
--- /dev/null
+++ b/inject/inject-guice-extensions/jsr250/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/jsr250/Jsr250KeyProvider.java
@@ -0,0 +1,64 @@
+/*
+ * 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.jsr250;
+
+import com.google.inject.Injector;
+import com.google.inject.Key;
+import com.google.inject.TypeLiteral;
+import com.google.inject.name.Names;
+import java.lang.reflect.Field;
+import javax.annotation.Resource;
+import javax.inject.Inject;
+import org.opendaylight.odlguice.inject.guice.extensions.injection.KeyProviderSkeleton;
+
+/**
+ * This code originated in https://github.com/mycila/guice and was forked into
+ * OpenDaylight.
+ * @author Mathieu Carbou (mathieu.carbou@gmail.com)
+ */
+class Jsr250KeyProvider extends KeyProviderSkeleton<Resource> {
+
+    @Inject Injector injector;
+
+    @Override
+    public Key<?> getKey(TypeLiteral<?> injectedType, Field injectedMember, Resource resourceAnnotation) {
+        String name = resourceAnnotation.name();
+
+        if (name.length() != 0) {
+            // explicit key
+
+            // if a name is provided, it acts as a Named binding and this means we ask for a precise key
+            return Key.get(injectedType.getFieldType(injectedMember), Names.named(name));
+
+        } else {
+            // implicit key
+
+            // if no name given, try a combination with the field name
+            Key<?> implicitKey = Key.get(injectedType.getFieldType(injectedMember),
+                    Names.named(injectedMember.getName()));
+
+            if (injector.getExistingBinding(implicitKey) != null) {
+                return implicitKey;
+
+            } else {
+                // else create the find based on the field type (default behavior) - with
+                // optional existing binding annotations
+                return super.getKey(injectedType, injectedMember, resourceAnnotation);
+            }
+
+        }
+    }
+}