# all files / bpmn-js/lib/features/copy-paste/ BpmnCopyPaste.js

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91.3% Branches 21/23
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     import {
      getBusinessObject,
      is
    } from '../../util/ModelUtil';

    import {
      forEach,
      isArray,
      isUndefined,
      omit,
      reduce
    } from 'min-dash';

    function copyProperties(source, target, properties) {
      if (!isArray(properties)) {
        properties = [ properties ];
      }

      forEach(properties, function(property) {
        if (!isUndefined(source[property])) {
          target[property] = source[property];
        }
      });
    }

    function removeProperties(element, properties) {
      Eif (!isArray(properties)) {
        properties = [ properties ];
      }

      forEach(properties, function(property) {
        Eif (element[property]) {
          delete element[property];
        }
      });
    }

    var LOW_PRIORITY = 750;

    export default function BpmnCopyPaste(bpmnFactory, eventBus, moddleCopy) {

      eventBus.on('copyPaste.copyElement', LOW_PRIORITY, function(context) {
        var descriptor = context.descriptor,
            element = context.element;

        var businessObject = descriptor.oldBusinessObject = getBusinessObject(element);

        descriptor.type = element.type;

        copyProperties(businessObject, descriptor, 'name');

        descriptor.di = {};

        // fill and stroke will be set to DI
        copyProperties(businessObject.di, descriptor.di, [
          'fill',
          'stroke'
        ]);

        copyProperties(businessObject.di, descriptor, 'isExpanded');

        if (isLabel(descriptor)) {
          return descriptor;
        }

        // default sequence flow
        if (businessObject.default) {
          descriptor.default = businessObject.default.id;
        }
      });

      eventBus.on('moddleCopy.canCopyProperty', function(context) {
        var parent = context.parent,
            property = context.property,
            propertyName = context.propertyName;

        if (is(parent, 'bpmn:Participant') &&
          is(property, 'bpmn:Process') &&
          propertyName === 'processRef') {
          return bpmnFactory.create('bpmn:Process');
        }
      });

      var references;

      function resolveReferences(descriptor) {
        var businessObject = getBusinessObject(descriptor);

        // default sequence flows
        if (descriptor.default) {
          references[ descriptor.default ] = {
            element: businessObject,
            property: 'default'
          };
        }

        references = omit(references, reduce(references, function(array, reference, key) {
          var element = reference.element,
              property = reference.property;

          if (key === descriptor.id) {
            element[ property ] = businessObject;

            array.push(descriptor.id);
          }

          return array;
        }, []));
      }

      eventBus.on('copyPaste.pasteElements', function() {
        references = {};
      });

      eventBus.on('copyPaste.pasteElement', function(context) {
        var cache = context.cache,
            descriptor = context.descriptor,
            oldBusinessObject = descriptor.oldBusinessObject,
            newBusinessObject;

        // do NOT copy business object if external label
        if (isLabel(descriptor)) {
          descriptor.businessObject = getBusinessObject(cache[ descriptor.labelTarget ]);

          return;
        }

        newBusinessObject = bpmnFactory.create(oldBusinessObject.$type);

        descriptor.businessObject = moddleCopy.copyElement(
          oldBusinessObject,
          newBusinessObject
        );

        // resolve references e.g. default sequence flow
        resolveReferences(descriptor);

        copyProperties(descriptor, newBusinessObject, [
          'isExpanded',
          'name'
        ]);

        removeProperties(descriptor, 'oldBusinessObject');
      });

    }

    BpmnCopyPaste.$inject = [
      'bpmnFactory',
      'eventBus',
      'moddleCopy'
    ];

    // helpers //////////

    function isLabel(element) {
      return !!element.labelTarget;
    }