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  /* Soot - a J*va Optimization Framework
   * Copyright (C) 1997-1999 Raja Vallee-Rai
   *      modified 2002 Florian Loitsch
   *
   * This library 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 library 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  */
 
 /*
  * Modified by the Sable Research Group and others 1997-1999.  
  * See the 'credits' file distributed with Soot for the complete list of
  * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
  */
 
 
 package soot.toolkits.scalar;
 
 import java.util.*;

Represents information for flow analysis. A FlowSet is an element of a lattice; this lattice might be described by a FlowUniverse. If add, remove, size, isEmpty, toList and contains are implemented, the lattice must be the powerset of some set.

See also:
FlowUniverse
 
 public interface FlowSet {
  
Clones the current FlowSet.
 
   public FlowSet clone();

  
returns an empty set, most often more efficient than: ((FlowSet)clone()).clear()
 
   public Object emptySet();

  
Copies the current FlowSet into dest.
 
   public void copy(FlowSet dest);

  
Sets this FlowSet to the empty set (more generally, the bottom element of the lattice.)
 
   public void clear();

  
Returns the union (join) of this FlowSet and other, putting result into this.
 
   public void union(FlowSet other);

  
Returns the union (join) of this FlowSet and other, putting result into dest. dest, other and this could be the same object.
 
   public void union(FlowSet otherFlowSet dest);

  
Returns the intersection (meet) of this FlowSet and other, putting result into this.
 
   public void intersection(FlowSet other);

  
Returns the intersection (meet) of this FlowSet and other, putting result into dest. dest, other and this could be the same object.
 
   public void intersection(FlowSet otherFlowSet dest);

  
Returns the set difference (this intersect ~other) of this FlowSet and other, putting result into this.
 
   public void difference(FlowSet other);

  
Returns the set difference (this intersect ~other) of this FlowSet and other, putting result into dest. dest, other and this could be the same object.
 
  public void difference(FlowSet otherFlowSet dest);

  
Returns true if this FlowSet is the empty set.
  public boolean isEmpty();
  /* The following methods force the FlowSet to be a powerset. */

  
Returns the size of the current FlowSet.
  public int size();

  
Adds obj to this.
  public void add(Object obj);

  
puts this union obj into dest.
  public void add(Object objFlowSet dest);

  
Removes obj from this.
  public void remove(Object obj);

  
Puts this minus obj into dest.
  public void remove(Object objFlowSet dest);

  
Returns true if this FlowSet contains obj.
  public boolean contains(Object obj);

  
returns an iterator over the elements of the flowSet. Note that the iterator might be backed, and hence be faster in the creation, than doing toList().iterator().
  public Iterator iterator();

  
Returns an unbacked list of contained objects for this FlowSet.
  public List toList();
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