/* 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.listener;
import java.util.List;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.ExecutionListener;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.JavaDelegate;
import org.activiti.engine.impl.bpmn.helper.ClassDelegate;
import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.delegate.ExecutionListenerInvocation;
import org.activiti.engine.impl.delegate.JavaDelegateInvocation;
/**
* @author Joram Barrez
*/
public class DelegateExpressionExecutionListener implements ExecutionListener {
protected Expression expression;
private final List<FieldDeclaration> fieldDeclarations;
public DelegateExpressionExecutionListener(Expression expression, List<FieldDeclaration> fieldDeclarations) {
this.expression = expression;
this.fieldDeclarations = fieldDeclarations;
}
public void notify(DelegateExecution execution) throws Exception {
// Note: we can't cache the result of the expression, because the
// execution can change: eg. delegateExpression='${mySpringBeanFactory.randomSpringBean()}'
Object delegate = expression.getValue(execution);
ClassDelegate.applyFieldDeclaration(fieldDeclarations, delegate);
if (delegate instanceof ExecutionListener) {
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(new ExecutionListenerInvocation((ExecutionListener) delegate, execution));
} else if (delegate instanceof JavaDelegate) {
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(new JavaDelegateInvocation((JavaDelegate) delegate, execution));
} else {
throw new ActivitiException("Delegate expression " + expression
+ " did not resolve to an implementation of " + ExecutionListener.class
+ " nor " + JavaDelegate.class);
}
}
/**
* returns the expression text for this execution listener. Comes in handy if you want to
* check which listeners you already have.
*/
public String getExpressionText() {
return expression.getExpressionText();
}
}