1 files changed, 36 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/StringCanonicalizer.java b/src/main/java/com/google/devtools/build/lib/util/StringCanonicalizer.java
new file mode 100644
index 0000000000..7bdbe7eb63
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/util/StringCanonicalizer.java
@@ -0,0 +1,36 @@
+// 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.util;
+
+import com.google.common.collect.Interner;
+import com.google.common.collect.Interners;
+
+/**
+ * Static singleton holder for the string interning pool.  Doesn't use {@link String#intern}
+ * because that consumes permgen space.
+ */
+public final class StringCanonicalizer {
+
+  private static final Interner<String> interner = Interners.newWeakInterner();
+
+  private StringCanonicalizer() {
+  }
+
+  /**
+   * Interns a String.
+   */
+  public final static String intern(String arg) {
+    return interner.intern(arg);
+  }
+}