102 lines
3.2 KiB
JavaScript
102 lines
3.2 KiB
JavaScript
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'use strict';
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var elementHelper = require('../helper/ElementHelper');
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/**
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* A handler capable of creating a new element under a provided parent
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* and updating / creating a reference to it in one atomic action.
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*
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* @class
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* @constructor
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*/
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function CreateAndReferenceElementHandler(elementRegistry, bpmnFactory) {
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this._elementRegistry = elementRegistry;
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this._bpmnFactory = bpmnFactory;
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}
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CreateAndReferenceElementHandler.$inject = [ 'elementRegistry', 'bpmnFactory' ];
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module.exports = CreateAndReferenceElementHandler;
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// api ////////////////////
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/**
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* Creates a new element under a provided parent and updates / creates a reference to it in
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* one atomic action.
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*
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* @method CreateAndReferenceElementHandler#execute
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*
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* @param {Object} context
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* @param {djs.model.Base} context.element which is the context for the reference
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* @param {moddle.referencingObject} context.referencingObject the object which creates the reference
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* @param {String} context.referenceProperty the property of the referencingObject which makes the reference
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* @param {moddle.newObject} context.newObject the new object to add
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* @param {moddle.newObjectContainer} context.newObjectContainer the container for the new object
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*
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* @returns {Array<djs.mode.Base>} the updated element
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*/
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CreateAndReferenceElementHandler.prototype.execute = function(context) {
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var referencingObject = ensureNotNull(context.referencingObject, 'referencingObject'),
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referenceProperty = ensureNotNull(context.referenceProperty, 'referenceProperty'),
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newObject = ensureNotNull(context.newObject, 'newObject'),
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newObjectContainer = ensureNotNull(context.newObjectContainer, 'newObjectContainer'),
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newObjectParent = ensureNotNull(context.newObjectParent, 'newObjectParent'),
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changed = [ context.element ]; // this will not change any diagram-js elements
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// create new object
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var referencedObject = elementHelper
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.createElement(newObject.type, newObject.properties, newObjectParent, this._bpmnFactory);
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context.referencedObject = referencedObject;
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// add to containing list
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newObjectContainer.push(referencedObject);
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// adjust reference attribute
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context.previousReference = referencingObject[referenceProperty];
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referencingObject[referenceProperty] = referencedObject;
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context.changed = changed;
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// indicate changed on objects affected by the update
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return changed;
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};
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/**
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* Reverts the update
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*
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* @method CreateAndReferenceElementHandler#revert
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*
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* @param {Object} context
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*
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* @returns {djs.mode.Base} the updated element
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*/
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CreateAndReferenceElementHandler.prototype.revert = function(context) {
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var referencingObject = context.referencingObject,
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referenceProperty = context.referenceProperty,
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previousReference = context.previousReference,
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referencedObject = context.referencedObject,
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newObjectContainer = context.newObjectContainer;
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// reset reference
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referencingObject.set(referenceProperty, previousReference);
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// remove new element
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newObjectContainer.splice(newObjectContainer.indexOf(referencedObject), 1);
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return context.changed;
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};
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// helpers //////////////
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function ensureNotNull(prop, name) {
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if (!prop) {
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throw new Error(name + ' required');
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}
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return prop;
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}
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