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 /* Soot - a J*va Optimization Framework
  * Copyright (C) 1997-1999 Raja Vallee-Rai
  * 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
 * 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
package soot;

A box which can contain units.

See also:
public interface UnitBox extends Serializable
Sets this box to contain the given unit. Subject to canContainValue() checks.
    public void setUnit(Unit u);

Returns the unit contained within this box.
    public Unit getUnit();

Returns true if this box can contain the given Unit.
    public boolean canContainUnit(Unit u);   
Returns true if the UnitBox is holding a Unit that is the target of a branch (ie a Unit at the beginning of a CFG block). This is the default case.

Returns false if the UnitBox is holding a Unit that indicates the end of a CFG block and may require specialised processing for SSA.

    public boolean isBranchTarget();
    public void toString(UnitPrinter up); 
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