WeakStringInterner.java example

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/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * 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.intellij.util.containers;

import org.jetbrains.annotations.NotNull;

import java.util.Set;

/**
 * Allow to reuse equal strings to avoid memory being wasted on them. Strings are cached on weak references
 * and garbage-collected when not needed anymore.
 *
 * @see WeakInterner
 * @author peter
 */
public class WeakStringInterner extends StringInterner {
  private final WeakInterner<String> myDelegate = new WeakInterner<String>();
  
  @NotNull
  @Override
  public String intern(@NotNull String name) {
    return myDelegate.intern(name);
  }

  @Override
  public void clear() {
    myDelegate.clear();
  }

  @NotNull
  @Override
  public Set<String> getValues() {
    return myDelegate.getValues();
  }
}