1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/actions/AbstractActionOwner.java b/src/main/java/com/google/devtools/build/lib/actions/AbstractActionOwner.java
new file mode 100644
index 0000000000..0272160b96
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/actions/AbstractActionOwner.java
@@ -0,0 +1,70 @@
+// 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.actions;
+
+import com.google.devtools.build.lib.events.Location;
+import com.google.devtools.build.lib.syntax.Label;
+
+/**
+ * An action owner base class that provides default implementations for some of
+ * the {@link ActionOwner} methods.
+ */
+public abstract class AbstractActionOwner implements ActionOwner {
+
+  @Override
+  public String getAdditionalProgressInfo() {
+    return null;
+  }
+
+  @Override
+  public Location getLocation() {
+    return null;
+  }
+
+  @Override
+  public Label getLabel() {
+    return null;
+  }
+
+  @Override
+  public String getTargetKind() {
+    return "empty target kind";
+  }
+
+  @Override
+  public String getConfigurationName() {
+    return "empty configuration";
+  }
+
+  /**
+   * An action owner for special cases. Usage is strongly discouraged. 
+   */
+  public static final ActionOwner SYSTEM_ACTION_OWNER = new AbstractActionOwner() {
+    @Override
+    public final String getConfigurationName() {
+      return "system";
+    }
+
+    @Override
+    public String getConfigurationMnemonic() {
+      return "system";
+    }
+
+    @Override
+    public final String getConfigurationShortCacheKey() {
+      return "system";
+    }
+  };
+}