Add example implementation of ExternalIncludedIn extension point

Change-Id: Ied5517cf9da58c748ad60bdf96444828a6051df3
Signed-off-by: Edwin Kempin <ekempin@google.com>

src/main/java/com/googlesource/gerrit/plugins/cookbook/DeployedOnIncludedInExtension.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/cookbook/DeployedOnIncludedInExtension.java b/src/main/java/com/googlesource/gerrit/plugins/cookbook/DeployedOnIncludedInExtension.java
new file mode 100644
index 0000000..2b0520f
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/cookbook/DeployedOnIncludedInExtension.java
@@ -0,0 +1,39 @@
+// Copyright (C) 2016 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.googlesource.gerrit.plugins.cookbook;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+import com.google.gerrit.extensions.config.ExternalIncludedIn;
+
+import java.util.Collection;
+
+public class DeployedOnIncludedInExtension implements ExternalIncludedIn {
+  private static final String PROD = "Production";
+  private static final String STAGING = "Staging";
+
+  @Override
+  public Multimap<String, String> getIncludedIn(String project, String commit,
+      Collection<String> tags, Collection<String> branches) {
+    Multimap<String, String> m = ArrayListMultimap.create();
+    m.put(PROD, "A");
+    m.put(PROD, "B");
+    m.put(PROD, "C");
+    m.put(STAGING, "X");
+    m.put(STAGING, "Y");
+    m.put(STAGING, "Z");
+    return m;
+  }
+}

src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java b/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
index f6181ce..297e1e8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
@@ -21,6 +21,7 @@
 import com.google.gerrit.extensions.annotations.Exports;
 import com.google.gerrit.extensions.api.projects.ProjectConfigEntryType;
 import com.google.gerrit.extensions.client.InheritableBoolean;
+import com.google.gerrit.extensions.config.ExternalIncludedIn;
 import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.extensions.events.NewProjectCreatedListener;
 import com.google.gerrit.extensions.events.UsageDataPublishedListener;
@@ -78,6 +79,8 @@
     DynamicSet.bind(binder(), NewProjectCreatedListener.class)
         .to(ProjectCreatedListener.class);
     configurePluginParameters();
+    DynamicSet.bind(binder(), ExternalIncludedIn.class)
+        .to(DeployedOnIncludedInExtension.class);
 
     bind(ChangeOperatorFactory.class)
         .annotatedWith(Exports.named("sample"))