1 files changed, 33 insertions, 0 deletions
diff --git a/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/CopyEntryFilter.java b/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/CopyEntryFilter.java
new file mode 100644
index 0000000000..586c378d64
--- /dev/null
+++ b/src/java_tools/singlejar/java/com/google/devtools/build/singlejar/CopyEntryFilter.java
@@ -0,0 +1,33 @@
+// 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.singlejar;
+
+import java.io.IOException;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * A filter which invokes {@link StrategyCallback#copy} for every entry. As a
+ * result, the first entry for every given name is copied and further entries
+ * with the same name are skipped.
+ */
+@Immutable
+public final class CopyEntryFilter implements ZipEntryFilter {
+
+  @Override
+  public void accept(String filename, StrategyCallback callback) throws IOException {
+    callback.copy(null);
+  }
+}