code: /***************************************************************************
   *   Copyright (C) by Fabrizio Montesi                                     *
   *                                                                         *
   *   This program is free software; you can redistribute it and/or modify  *
   *   it under the terms of the GNU Library General Public License as       *
   *   published by the Free Software Foundation; either version 2 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 Public License for more details.                          *
   *                                                                         *
   *   You should have received a copy of the GNU Library General Public     *
   *   License along with this program; if not, write to the                 *
   *   Free Software Foundation, Inc.,                                       *
   *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
   *                                                                         *
   *   For details about the authors of this software, see the AUTHORS file. *
   ***************************************************************************/
  
  package jolie.process;
  
  import jolie.ExecutionThread;
  import jolie.runtime.expression.Expression;
  import jolie.runtime.VariablePath;
  import jolie.runtime.InvalidIdException;
  import jolie.runtime.Value;
  
  /** Assigns an expression value to a VariablePath.
   * @see Expression
   * @see VariablePath
   * @author Fabrizio Montesi
   */
  public class AssignmentProcess implements Process, Expression
  {
  	final private VariablePath varPath;
  	final private Expression expression;
  
  	/** Constructor.
  	 * 
  	 * @param varPath the variable which will receive the value
  	 * @param expression the expression of which the evaluation will be stored in the variable
  	 */
  	public AssignmentProcess( VariablePath varPath, Expression expression )
  	{
  		this.varPath = varPath;
  		this.expression = expression;
  	}
  	
  	public Process clone( TransformationReason reason )
  	{
  		return new AssignmentProcess(
  					(VariablePath)varPath.cloneExpression( reason ),
  					expression.cloneExpression( reason )
  				);
  	}
  	
  	public Expression cloneExpression( TransformationReason reason )
  	{
  		return new AssignmentProcess(
  					(VariablePath)varPath.cloneExpression( reason ),
  					expression.cloneExpression( reason )
  				);
  	}
  	
  	/** Evaluates the expression and stores its value in the variable. */
  	public void run()
  	{
  		if ( ExecutionThread.currentThread().isKilled() )
  			return;
  		varPath.getValue().assignValue( expression.evaluate() );
  	}
  	
  	public Value evaluate()
  	{
  		Value val = varPath.getValue();
  		val.assignValue( expression.evaluate() );
  		return val;
  	}
  	
  	public boolean isKillable()
  	{
  		return true;
  	}
  }
  