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A Java Optimization Framework

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package soot.toolkits.scalar;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2002 Florian Loitsch
 * %%
 * 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%
 */

/**
 * provides functional code for most of the methods. Subclasses are invited to provide a more efficient version. Most often
 * this will be done in the following way:

 *
 *  * public void yyy(FlowSet dest) {
 *   if (dest instanceof xxx) {
 *     blahblah;
 *   } else
 *     super.yyy(dest)
 * }
 * 
 */

public abstract class AbstractBoundedFlowSet extends AbstractFlowSet implements BoundedFlowSet {

  @Override
  public void complement() {
    complement(this);
  }

  @Override
  public void complement(FlowSet dest) {
    if (this == dest) {
      complement();
    } else {
      BoundedFlowSet tmp = (BoundedFlowSet) topSet();
      tmp.difference(this, dest);
    }
  }

  @Override
  public FlowSet topSet() {
    BoundedFlowSet tmp = (BoundedFlowSet) emptySet();
    tmp.complement();
    return tmp;
  }
}