Add a JNDI ObjectFactory for Datastore instances

gcloud-java-datastore/src/main/java/com/google/gcloud/spi/DatastoreObjectFactory.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2015 Google Inc. All Rights Reserved.
+ *
+ * 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 com.google.gcloud.spi;
+
+import java.util.Hashtable;
+
+import javax.naming.Context;
+import javax.naming.Name;
+import javax.naming.spi.ObjectFactory;
+
+import com.google.gcloud.datastore.DatastoreFactory;
+import com.google.gcloud.datastore.DatastoreOptions;
+
+/**
+ * JNDI ObjectFactory for Datastore instances.
+ */
+public class DatastoreObjectFactory implements ObjectFactory {
+
+    @Override
+    public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable<?, ?> environment) throws Exception {
+        // TODO: initialize options using values from tree.
+        return DatastoreFactory.instance().get(DatastoreOptions.defaultInstance());
+    }
+}