/* 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.behavior;
import org.activiti.engine.delegate.BpmnError;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.impl.bpmn.helper.ErrorPropagation;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;
/**
* ActivityBehavior that evaluates an expression when executed. Optionally, it sets the result
* of the expression as a variable on the execution.
*
* @author Tom Baeyens
* @author Christian Stettler
* @author Frederik Heremans
* @author Slawomir Wojtasiak (Patch for ACT-1159)
* @author Falko Menge
*/
public class ServiceTaskExpressionActivityBehavior extends TaskActivityBehavior {
protected Expression expression;
protected String resultVariable;
public ServiceTaskExpressionActivityBehavior(Expression expression, String resultVariable) {
this.expression = expression;
this.resultVariable = resultVariable;
}
public void execute(ActivityExecution execution) throws Exception {
Object value = null;
try {
value = expression.getValue(execution);
if (resultVariable != null) {
execution.setVariable(resultVariable, value);
}
leave(execution);
} catch (Exception exc) {
Throwable cause = exc;
BpmnError error = null;
while (cause != null) {
if (cause instanceof BpmnError) {
error = (BpmnError) cause;
break;
}
cause = cause.getCause();
}
if (error != null) {
ErrorPropagation.propagateError(error, execution);
} else {
throw exc;
}
}
}
}