Examples of org.camunda.bpm.engine.impl.el.ExpressionManager

org.camunda.bpm.engine.impl.el.ExpressionManager

Central manager for all expressions.

Process parsers will use this to build expression objects that are stored in the process definitions.

Then also this class is used as an entry point for runtime evaluation of the expressions.
@author Tom Baeyens @author Dave Syer @author Frederik Heremans

    // get the caseDefinition...
    CaseDefinitionEntity caseDefinition = (CaseDefinitionEntity) context.getCaseDefinition();
    // ... and taskDefinition to caseDefinition
    caseDefinition.getTaskDefinitions().put(taskDefinition.getKey(), taskDefinition);


    ExpressionManager expressionManager = context.getExpressionManager();
    // create decorator
    TaskDecorator taskDecorator = new TaskDecorator(taskDefinition, expressionManager);


    // set taskDecorator on behavior
    HumanTaskActivityBehavior behavior = (HumanTaskActivityBehavior) activity.getActivityBehavior();

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      HumanTask definition = getDefinition(element);
      name = definition.getName();
    }


    if (name != null) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression nameExpression = expressionManager.createExpression(name);
      taskDefinition.setNameExpression(nameExpression);
    }


  }

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  protected void initializeTaskDefinitionFormKey(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    HumanTask definition = getDefinition(element);


    String formKey = definition.getCamundaFormKey();
    if (formKey != null) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression formKeyExpression = expressionManager.createExpression(formKey);
      taskDefinition.setFormKey(formKeyExpression);
    }
  }

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    } else {
      assignee = definition.getCamundaAssignee();
    }


    if (assignee != null) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression assigneeExpression = expressionManager.createExpression(assignee);
      taskDefinition.setAssigneeExpression(assigneeExpression);
    }
  }

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    }
  }


  protected void initializeTaskDefinitionCandidateUsers(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    HumanTask definition = getDefinition(element);
    ExpressionManager expressionManager = context.getExpressionManager();


    List<String> candidateUsers = definition.getCamundaCandidateUsersList();
    for (String candidateUser : candidateUsers) {
      Expression candidateUserExpression = expressionManager.createExpression(candidateUser);
      taskDefinition.addCandidateUserIdExpression(candidateUserExpression);
    }
  }

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    }
  }


  protected void initializeTaskDefinitionCandidateGroups(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    HumanTask definition = getDefinition(element);
    ExpressionManager expressionManager = context.getExpressionManager();


    List<String> candidateGroups = definition.getCamundaCandidateGroupsList();
    for (String candidateGroup : candidateGroups) {
      Expression candidateGroupExpression = expressionManager.createExpression(candidateGroup);
      taskDefinition.addCandidateGroupIdExpression(candidateGroupExpression);
    }
  }

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  protected void initializeTaskDefinitionDueDate(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    HumanTask definition = getDefinition(element);


    String dueDate = definition.getCamundaDueDate();
    if (dueDate != null) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression dueDateExpression = expressionManager.createExpression(dueDate);
      taskDefinition.setDueDateExpression(dueDateExpression);
    }
  }

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  protected void initializeTaskDefinitionPriority(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    HumanTask definition = getDefinition(element);


    String priority = definition.getCamundaPriority();
    if (priority != null) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression priorityExpression = expressionManager.createExpression(priority);
      taskDefinition.setPriorityExpression(priorityExpression);
    }
  }

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  }


  protected void initializeTaskDescription(CmmnElement element, TaskDefinition taskDefinition, CmmnHandlerContext context) {
    String description = getDesciption(element);
    if (description != null && ! description.isEmpty()) {
      ExpressionManager expressionManager = context.getExpressionManager();
      Expression descriptionExpression = expressionManager.createExpression(description);
      taskDefinition.setDescriptionExpression(descriptionExpression);
    }
  }

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  protected TaskListener initializeTaskListener(CmmnElement element, CmmnActivity activity, CmmnHandlerContext context, CamundaTaskListener listener) {
    Collection<CamundaField> fields = listener.getCamundaFields();
    List<FieldDeclaration> fieldDeclarations = initializeFieldDeclarations(element, activity, context, fields);


    ExpressionManager expressionManager = context.getExpressionManager();


    TaskListener taskListener = null;


    String className = listener.getCamundaClass();
    String expression = listener.getCamundaExpression();
    String delegateExpression = listener.getCamundaDelegateExpression();
    CamundaScript scriptElement = listener.getCamundaScript();


    if (className != null) {
      taskListener = new ClassDelegateTaskListener(className, fieldDeclarations);


    } else if (expression != null) {
      Expression expressionExp = expressionManager.createExpression(expression);
      taskListener = new ExpressionTaskListener(expressionExp);


    } else if (delegateExpression != null) {
      Expression delegateExp = expressionManager.createExpression(delegateExpression);
      taskListener = new DelegateExpressionTaskListener(delegateExp, fieldDeclarations);


    } else if (scriptElement != null) {
      ExecutableScript executableScript = initializeScript(element, activity, context, scriptElement);
      if (executableScript != null) {

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