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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.flowable.engine.impl.bpmn.data;

import org.flowable.common.engine.api.delegate.Expression;
import org.flowable.engine.delegate.DelegateExecution;
import org.flowable.variable.api.delegate.VariableScope;

/**
 * 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(DelegateExecution execution) {
        VariableScope variableScope = (VariableScope) execution;
        Object value = this.fromExpression.getValue(variableScope);
        this.toExpression.setValue(value, variableScope);
    }
}