src/main/java/com/google/devtools/build/lib/vfs/Canonicalizer.java

// Copyright 2014 The Bazel Authors. 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 com.google.common.collect.Interner;
import com.google.devtools.build.lib.concurrent.BlazeInterners;

/**
 * Static singleton holder for certain interning pools.
 */
public final class Canonicalizer<E> {

  private static final Interner<PathFragment> FRAGMENT_INTERNER =
      BlazeInterners.newWeakInterner();

  /**
   * Creates an instance of Canonicalizer tracking path fragments.
   */
  public static Interner<PathFragment> fragments() {
    return FRAGMENT_INTERNER;
  }

  private Canonicalizer() {
  }
}