public DecisionTask unmarshall(JsonUnmarshallerContext context) throws Exception {
    DecisionTask decisionTask = new DecisionTask();

    int originalDepth = context.getCurrentDepth();
    String currentParentElement = context.getCurrentParentElement();
    int targetDepth = originalDepth + 1;

    JsonToken token = context.currentToken;
    if (token == null) token = context.nextToken();
    if (token == VALUE_NULL) return null;

    while (true) {
      if (token == null) break;

      if (token == FIELD_NAME || token == START_OBJECT) {
        if (context.testExpression("taskToken", targetDepth)) {
          context.nextToken();
          decisionTask.setTaskToken(StringJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("startedEventId", targetDepth)) {
          context.nextToken();
          decisionTask.setStartedEventId(LongJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("workflowExecution", targetDepth)) {
          context.nextToken();
          decisionTask.setWorkflowExecution(
              WorkflowExecutionJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("workflowType", targetDepth)) {
          context.nextToken();
          decisionTask.setWorkflowType(
              WorkflowTypeJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("events", targetDepth)) {
          decisionTask.setEvents(
              new ListUnmarshaller<HistoryEvent>(HistoryEventJsonUnmarshaller.getInstance())
                  .unmarshall(context));
        }
        if (context.testExpression("nextPageToken", targetDepth)) {
          context.nextToken();
          decisionTask.setNextPageToken(StringJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("previousStartedEventId", targetDepth)) {
          context.nextToken();
          decisionTask.setPreviousStartedEventId(
              LongJsonUnmarshaller.getInstance().unmarshall(context));
        }
      } else if (token == END_ARRAY || token == END_OBJECT) {
        if (context.getLastParsedParentElement() == null
            || context.getLastParsedParentElement().equals(currentParentElement)) {
          if (context.getCurrentDepth() <= originalDepth) break;
        }
      }

      token = context.nextToken();
    }

    return decisionTask;
  }
  public ChildWorkflowExecutionFailedEventAttributes unmarshall(JsonUnmarshallerContext context)
      throws Exception {
    ChildWorkflowExecutionFailedEventAttributes childWorkflowExecutionFailedEventAttributes =
        new ChildWorkflowExecutionFailedEventAttributes();

    int originalDepth = context.getCurrentDepth();
    int targetDepth = originalDepth + 1;

    JsonToken token = context.currentToken;
    if (token == null) token = context.nextToken();

    while (true) {
      if (token == null) break;

      if (token == FIELD_NAME || token == START_OBJECT) {
        if (context.testExpression("workflowExecution", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setWorkflowExecution(
              WorkflowExecutionJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("workflowType", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setWorkflowType(
              WorkflowTypeJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("reason", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setReason(
              StringJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("details", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setDetails(
              StringJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("initiatedEventId", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setInitiatedEventId(
              LongJsonUnmarshaller.getInstance().unmarshall(context));
        }
        if (context.testExpression("startedEventId", targetDepth)) {
          context.nextToken();
          childWorkflowExecutionFailedEventAttributes.setStartedEventId(
              LongJsonUnmarshaller.getInstance().unmarshall(context));
        }
      } else if (token == END_ARRAY || token == END_OBJECT) {
        if (context.getCurrentDepth() <= originalDepth) break;
      }
      token = context.nextToken();
    }

    return childWorkflowExecutionFailedEventAttributes;
  }