content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.ActivitiIllegalArgumentException;
  import org.activiti.engine.delegate.DelegateTask;
  import org.activiti.engine.delegate.Expression;
  import org.activiti.engine.delegate.TaskListener;
  import org.activiti.engine.impl.bpmn.helper.DelegateExpressionUtil;
  import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
  import org.activiti.engine.impl.context.Context;
  import org.activiti.engine.impl.delegate.invocation.TaskListenerInvocation;
  
  /**
  
   */
  public class DelegateExpressionTaskListener implements TaskListener {
  
      protected Expression expression;
      private final List<FieldDeclaration> fieldDeclarations;
  
      public DelegateExpressionTaskListener(Expression expression, List<FieldDeclaration> fieldDeclarations) {
          this.expression = expression;
          this.fieldDeclarations = fieldDeclarations;
      }
  
      public void notify(DelegateTask delegateTask) {
          Object delegate = DelegateExpressionUtil.resolveDelegateExpression(expression, delegateTask, fieldDeclarations);
          if (delegate instanceof TaskListener) {
              try {
                  Context.getProcessEngineConfiguration()
                      .getDelegateInterceptor()
                      .handleInvocation(new TaskListenerInvocation((TaskListener) delegate, delegateTask));
              } catch (Exception e) {
                  throw new ActivitiException("Exception while invoking TaskListener: " + e.getMessage(), e);
              }
          } else {
              throw new ActivitiIllegalArgumentException(
                  "Delegate expression " + expression + " did not resolve to an implementation of " + TaskListener.class
              );
          }
      }
  
      /**
       * returns the expression text for this task listener. Comes in handy if you want to check which listeners you already have.
       */
      public String getExpressionText() {
          return expression.getExpressionText();
      }
  }
  