Import code from internal repository to git

java/com/google/domain/registry/model/index/EppResourceIndex.java

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+// Copyright 2016 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.domain.registry.model.index;
+
+import static com.google.domain.registry.util.TypeUtils.instantiate;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.domain.registry.model.BackupGroupRoot;
+import com.google.domain.registry.model.EppResource;
+
+import com.googlecode.objectify.Key;
+import com.googlecode.objectify.Ref;
+import com.googlecode.objectify.annotation.Entity;
+import com.googlecode.objectify.annotation.Id;
+import com.googlecode.objectify.annotation.Index;
+import com.googlecode.objectify.annotation.Parent;
+
+/** An index that allows for quick enumeration of all EppResource entities (e.g. via map reduce). */
+@Entity
+public class EppResourceIndex extends BackupGroupRoot {
+
+  @Id
+  String id;
+
+  @Parent
+  Key<EppResourceIndexBucket> bucket;
+
+  Ref<? extends EppResource> reference;
+
+  @Index
+  String kind;
+
+  public Ref<? extends EppResource> getReference() {
+    return reference;
+  }
+
+  @VisibleForTesting
+  public Key<EppResourceIndexBucket> getBucket() {
+    return bucket;
+  }
+
+  @VisibleForTesting
+  public static <T extends EppResource> EppResourceIndex create(
+      Key<EppResourceIndexBucket> bucket, Key<T> resourceKey) {
+    EppResourceIndex instance = instantiate(EppResourceIndex.class);
+    instance.reference = Ref.create(resourceKey);
+    instance.kind = resourceKey.getKind();
+    instance.id = resourceKey.getString();  // creates a web-safe key string
+    instance.bucket = bucket;
+    return instance;
+  }
+
+  public static <T extends EppResource> EppResourceIndex create(Key<T> resourceKey) {
+    return create(EppResourceIndexBucket.getBucketKey(resourceKey), resourceKey);
+  }
+}