Update from Google.

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MOE_MIGRATED_REVID=85702957

1 files changed, 50 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/vfs/PathFragmentSerializationProxy.java b/src/main/java/com/google/devtools/build/lib/vfs/PathFragmentSerializationProxy.java
new file mode 100644
index 0000000000..6e1b04dbe6
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/vfs/PathFragmentSerializationProxy.java
@@ -0,0 +1,50 @@
+// 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.vfs;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectOutput;
+
+
+/**
+ * A helper proxy for serializing immutable {@link PathFragment} objects.
+ */
+public final class PathFragmentSerializationProxy implements Externalizable {
+  private String pathFragmentString;
+
+  public PathFragmentSerializationProxy(String pathFragmentString) {
+    this.pathFragmentString = pathFragmentString;
+  }
+
+  // For deserialization machinery.
+  public PathFragmentSerializationProxy() {
+  }
+
+  @Override
+  public void writeExternal(ObjectOutput out) throws IOException {
+    // Manual serialization gives us about a 30% reduction in size.
+    out.writeUTF(pathFragmentString);
+  }
+
+  @Override
+  public void readExternal(java.io.ObjectInput in) throws IOException {
+    this.pathFragmentString = in.readUTF();
+  }
+
+  private Object readResolve() {
+    return new PathFragment(pathFragmentString);
+  }
+}
+