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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.util;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2002 Ondrej Lhotak
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/**
 * A map with sets as values, HashMap implementation.
 *
 * @author Ondrej Lhotak
 */

public class HashMultiMap extends AbstractMultiMap {

  private static final long serialVersionUID = -1928446853508616896L;

  private static final float DEFAULT_LOAD_FACTOR = 0.7f;

  protected final Map> m;
  protected final float loadFactor;

  protected Map> createMap() {
    return createMap(0);
  }

  protected Map> createMap(int initialSize) {
    return new HashMap>(initialSize, loadFactor);
  }

  public HashMultiMap() {
    this.loadFactor = DEFAULT_LOAD_FACTOR;
    this.m = createMap();
  }

  public HashMultiMap(int initialSize) {
    this.loadFactor = DEFAULT_LOAD_FACTOR;
    this.m = createMap(initialSize);
  }

  public HashMultiMap(int initialSize, float loadFactor) {
    this.loadFactor = loadFactor;
    this.m = createMap(initialSize);
  }

  public HashMultiMap(MultiMap m) {
    this.loadFactor = DEFAULT_LOAD_FACTOR;
    this.m = createMap();
    putAll(m);
  }

  public HashMultiMap(Map> m) {
    this.loadFactor = DEFAULT_LOAD_FACTOR;
    this.m = createMap();
    putAll(m);
  }

  @Override
  public int numKeys() {
    return m.size();
  }

  @Override
  public boolean containsKey(Object key) {
    return m.containsKey(key);
  }

  @Override
  public boolean containsValue(V value) {
    for (Set s : m.values()) {
      if (s.contains(value)) {
        return true;
      }
    }
    return false;
  }

  protected Set newSet() {
    return new HashSet(4);
  }

  private Set findSet(K key) {
    Set s = m.get(key);
    if (s == null) {
      s = newSet();
      m.put(key, s);
    }
    return s;
  }

  @Override
  public boolean put(K key, V value) {
    return findSet(key).add(value);
  }

  @Override
  public boolean putAll(K key, Set values) {
    if (values.isEmpty()) {
      return false;
    }
    return findSet(key).addAll(values);
  }

  @Override
  public boolean remove(K key, V value) {
    Set s = m.get(key);
    if (s == null) {
      return false;
    }
    boolean ret = s.remove(value);
    if (s.isEmpty()) {
      m.remove(key);
    }
    return ret;
  }

  @Override
  public boolean remove(K key) {
    return null != m.remove(key);
  }

  @Override
  public boolean removeAll(K key, Set values) {
    Set s = m.get(key);
    if (s == null) {
      return false;
    }
    boolean ret = s.removeAll(values);
    if (s.isEmpty()) {
      m.remove(key);
    }
    return ret;
  }

  @Override
  public Set get(K o) {
    Set ret = m.get(o);
    if (ret == null) {
      return Collections.emptySet();
    } else {
      return ret;
    }
  }

  @Override
  public Set keySet() {
    return m.keySet();
  }

  @Override
  public Set values() {
    Set ret = new HashSet(m.size());
    for (Set s : m.values()) {
      ret.addAll(s);
    }
    return ret;
  }

  @Override
  public boolean equals(Object o) {
    if (!(o instanceof MultiMap)) {
      return false;
    }
    @SuppressWarnings("unchecked")
    MultiMap mm = (MultiMap) o;
    if (!keySet().equals(mm.keySet())) {
      return false;
    }
    Iterator>> it = m.entrySet().iterator();
    while (it.hasNext()) {
      Map.Entry> e = it.next();
      Set s = e.getValue();
      if (!s.equals(mm.get(e.getKey()))) {
        return false;
      }
    }
    return true;
  }

  @Override
  public int hashCode() {
    return m.hashCode();
  }

  @Override
  public int size() {
    return m.size();
  }

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

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    for (Entry> entry : m.entrySet()) {
      builder.append(entry.getKey()).append(":\n").append(entry.getValue().toString()).append("\n\n");
    }
    if (builder.length() > 2) {
      builder.delete(builder.length() - 2, builder.length());
    }
    return builder.toString();
  }

}