1 files changed, 74 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/restapi/change/ChangeMessages.java b/java/com/google/gerrit/server/restapi/change/ChangeMessages.java
new file mode 100644
index 0000000000..25fc350720
--- /dev/null
+++ b/java/com/google/gerrit/server/restapi/change/ChangeMessages.java
@@ -0,0 +1,74 @@
+// Copyright (C) 2018 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.server.restapi.change;
+
+import com.google.gerrit.extensions.common.ChangeMessageInfo;
+import com.google.gerrit.extensions.registration.DynamicMap;
+import com.google.gerrit.extensions.restapi.ChildCollection;
+import com.google.gerrit.extensions.restapi.IdString;
+import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
+import com.google.gerrit.extensions.restapi.RestView;
+import com.google.gerrit.server.change.ChangeMessageResource;
+import com.google.gerrit.server.change.ChangeResource;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.util.List;
+
+@Singleton
+public class ChangeMessages implements ChildCollection<ChangeResource, ChangeMessageResource> {
+  private final DynamicMap<RestView<ChangeMessageResource>> views;
+  private final ListChangeMessages listChangeMessages;
+
+  @Inject
+  ChangeMessages(
+      DynamicMap<RestView<ChangeMessageResource>> views, ListChangeMessages listChangeMessages) {
+    this.views = views;
+    this.listChangeMessages = listChangeMessages;
+  }
+
+  @Override
+  public DynamicMap<RestView<ChangeMessageResource>> views() {
+    return views;
+  }
+
+  @Override
+  public ListChangeMessages list() {
+    return listChangeMessages;
+  }
+
+  @Override
+  public ChangeMessageResource parse(ChangeResource parent, IdString id)
+      throws OrmException, ResourceNotFoundException, PermissionBackendException {
+    String uuid = id.get();
+
+    List<ChangeMessageInfo> changeMessages = listChangeMessages.apply(parent);
+    int index = -1;
+    for (int i = 0; i < changeMessages.size(); ++i) {
+      ChangeMessageInfo changeMessage = changeMessages.get(i);
+      if (changeMessage.id.equals(uuid)) {
+        index = i;
+        break;
+      }
+    }
+
+    if (index < 0) {
+      throw new ResourceNotFoundException(String.format("change message %s not found", uuid));
+    }
+
+    return new ChangeMessageResource(parent, changeMessages.get(index), index);
+  }
+}