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A Java Optimization Framework

There is a newer version: 4.6.0

package soot.javaToJimple;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2004 Jennifer 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.HashMap;

public class BiMap {

  HashMap keyVal;
  HashMap valKey;

  public BiMap() {
  }

  public void put(Object key, Object val) {
    if (keyVal == null) {
      keyVal = new HashMap();
    }
    if (valKey == null) {
      valKey = new HashMap();
    }

    keyVal.put(key, val);
    valKey.put(val, key);

  }

  public Object getKey(Object val) {
    if (valKey == null) {
      return null;
    }
    return valKey.get(val);
  }

  public Object getVal(Object key) {
    if (keyVal == null) {
      return null;
    }
    return keyVal.get(key);
  }

  public boolean containsKey(Object key) {
    if (keyVal == null) {
      return false;
    }
    return keyVal.containsKey(key);
  }

  public boolean containsVal(Object val) {
    if (valKey == null) {
      return false;
    }
    return valKey.containsKey(val);
  }
}