platform/util/src/com/intellij/util/containers/MultiMapBasedOnSet.java

/*
 * Copyright 2000-2014 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.Collection;
import java.util.Collections;

@Deprecated
/**
 * @author Sergey Evdokimov
 * @deprecated Please use {@link MultiMap#createSet()}
 * to remove in IDEA 15
 */
public class MultiMapBasedOnSet<K, V> extends MultiMap<K, V> {

  @NotNull
  @Override
  protected Collection<V> createCollection() {
    return new HashSet<V>();
  }

  @NotNull
  @Override
  protected Collection<V> createEmptyCollection() {
    return Collections.emptySet();
  }

  @NotNull
  public static <K, V> MultiMap<K, V> createBasedOnSet() {
    return MultiMap.createSet();
  }

}