Dissolve gerrit-extension-api top-level directory

Change-Id: I47a130d3203cf45ce09f2a44e81449c55eaa693b

java/com/google/gerrit/extensions/api/projects/TagApi.java

@@ -0,0 +1,47 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.gerrit.extensions.api.projects;
+
+import com.google.gerrit.extensions.restapi.NotImplementedException;
+import com.google.gerrit.extensions.restapi.RestApiException;
+
+public interface TagApi {
+  TagApi create(TagInput input) throws RestApiException;
+
+  TagInfo get() throws RestApiException;
+
+  void delete() throws RestApiException;
+
+  /**
+   * A default implementation which allows source compatibility when adding new methods to the
+   * interface.
+   */
+  class NotImplemented implements TagApi {
+    @Override
+    public TagApi create(TagInput input) throws RestApiException {
+      throw new NotImplementedException();
+    }
+
+    @Override
+    public TagInfo get() throws RestApiException {
+      throw new NotImplementedException();
+    }
+
+    @Override
+    public void delete() throws RestApiException {
+      throw new NotImplementedException();
+    }
+  }
+}