# all files / Github/bpmn-js/lib/features/modeling/behavior/ CreateBoundaryEventBehavior.js

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     import inherits from 'inherits';

    import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';

    import { is } from '../../../util/ModelUtil';

    /**
     * BPMN specific create boundary event behavior
     */
    export default function CreateBoundaryEventBehavior(
        eventBus, modeling, elementFactory,
        bpmnFactory) {

      CommandInterceptor.call(this, eventBus);

      /**
       * replace intermediate event with boundary event when
       * attaching it to a shape
       */

      this.preExecute('shape.create', function(context) {
        var shape = context.shape,
            host = context.host,
            businessObject,
            boundaryEvent;

        var attrs = {
          cancelActivity: true
        };

        if (host && is(shape, 'bpmn:IntermediateThrowEvent')) {
          attrs.attachedToRef = host.businessObject;

          businessObject = bpmnFactory.create('bpmn:BoundaryEvent', attrs);

          boundaryEvent = {
            type: 'bpmn:BoundaryEvent',
            businessObject: businessObject
          };

          context.shape = elementFactory.createShape(boundaryEvent);
        }
      }, true);
    }

    CreateBoundaryEventBehavior.$inject = [
      'eventBus',
      'modeling',
      'elementFactory',
      'bpmnFactory'
    ];

    inherits(CreateBoundaryEventBehavior, CommandInterceptor);