1 files changed, 35 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/events/DelegatingEventHandler.java b/src/main/java/com/google/devtools/build/lib/events/DelegatingEventHandler.java
new file mode 100644
index 0000000000..d26d70c948
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/events/DelegatingEventHandler.java
@@ -0,0 +1,35 @@
+// Copyright 2014 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.devtools.build.lib.events;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * An ErrorEventListener which delegates to another ErrorEventListener.
+ * Primarily useful as a base class for extending behavior.
+ */
+public class DelegatingEventHandler implements EventHandler {
+  protected final EventHandler delegate;
+
+  public DelegatingEventHandler(EventHandler delegate) {
+    super();
+    this.delegate = Preconditions.checkNotNull(delegate);
+  }
+
+  @Override
+  public void handle(Event e) {
+    delegate.handle(e);
+  }
+}