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/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.bpmn.data;

import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.VariableScope;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;

/**
 * Implementation of the BPMN 2.0 'assignment'
 * 
 * @author Esteban Robles Luna
 */
public class Assignment {

  protected Expression fromExpression;
  
  protected Expression toExpression;
  
  public Assignment(Expression fromExpression, Expression toExpression) {
    this.fromExpression = fromExpression;
    this.toExpression = toExpression;
  }
  
  public void evaluate(ActivityExecution execution) {
    VariableScope variableScope = (VariableScope) execution;
    Object value = this.fromExpression.getValue(variableScope);
    this.toExpression.setValue(value, variableScope);
  }
}