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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.util;

import java.util.*;

/**
 * A key-values map that can have multiple values associated with each key.
 *
 * There is an efficient lookup method to retrieve all values of all keys.
 *
 * @param  the key type
 * @param  the value type
 * @author Johan Leys
 */
public class MultiValueMap {
  private final Map> keyValueMap = createKeyMap();

  private final Set values = createValueSet();

  protected Set createValueSet() {
    return new LinkedHashSet();
  }

  protected Map> createKeyMap() {
    return new LinkedHashMap>();
  }

  public int size() {
    return keyValueMap.size();
  }

  public Set keySet() {
    return keyValueMap.keySet();
  }

  public Collection> values() {
    return keyValueMap.values();
  }

  public Set>> entrySet() {
    return keyValueMap.entrySet();
  }

  public void put(K key, V value) {
    putAll(key, Collections.singleton(value));
  }

  public void putAll(Set key, V value) {
    putAll(key, Collections.singleton(value));
  }

  public void putAll(Set keys, Set values) {
    for (K key : keys) {
      putAll(key, values);
    }
  }

  public void putAll(K key, Set values) {
    this.values.addAll(values);
    Set existingValues = keyValueMap.get(key);
    if (existingValues == null) {
      existingValues = createValueSet();
      keyValueMap.put(key, existingValues);
    }
    existingValues.addAll(values);
  }

  public boolean remove(K key, V value) {
    Set values = keyValueMap.get(key);
    return values != null && values.remove(value);
  }

  public Set get(K key) {
    return keyValueMap.get(key);
  }

  /**
   * Returns a Set with all values of all keys.
   *
   * @return a Set with all values of all keys.
   */
  public Set getValues() {
    return values;
  }

  public void clear() {
    keyValueMap.clear();
    values.clear();
  }
}