expressionevaluator.java

ejb3 java session bean

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the JBPM BPEL PUBLIC LICENSE AGREEMENT as
 * published by JBoss Inc.; either version 1.0 of the License, or
 * (at your option) any later version.
 *
 * This software 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.
 */
package org.jbpm.bpel.sublang.exe;

import org.jbpm.graph.exe.Token;

/**
 * @author Alejandro Guizar
 * @version $Revision: 1.3 $ $Date: 2007/09/12 23:20:15 $
 */
public interface ExpressionEvaluator {

  /**
   * Evaluates the underlying expression, using the given token as the context
   * information.
   */
  public Object evaluate(Token contextToken);

  /**
   * Assigns a value to the location identified by the underlying expression,
   * using the given token as the context information.
   */
  public void assign(Token contextToken, Object value);
}