bpmn-js/lib/import/BpmnImporter.js

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'use strict';
var assign = require('lodash/object/assign'),
map = require('lodash/collection/map');
var LabelUtil = require('../util/LabelUtil');
var is = require('../util/ModelUtil').is;
var hasExternalLabel = LabelUtil.hasExternalLabel,
getExternalLabelBounds = LabelUtil.getExternalLabelBounds,
isExpanded = require('../util/DiUtil').isExpanded,
elementToString = require('./Util').elementToString;
function elementData(semantic, attrs) {
return assign({
id: semantic.id,
type: semantic.$type,
businessObject: semantic
}, attrs);
}
function collectWaypoints(waypoints) {
return map(waypoints, function(p) {
return { x: p.x, y: p.y };
});
}
function notYetDrawn(semantic, refSemantic, property) {
return new Error(
'element ' + elementToString(refSemantic) + ' referenced by ' +
elementToString(semantic) + '#' + property + ' not yet drawn');
}
/**
* An importer that adds bpmn elements to the canvas
*
* @param {EventBus} eventBus
* @param {Canvas} canvas
* @param {ElementFactory} elementFactory
* @param {ElementRegistry} elementRegistry
*/
function BpmnImporter(eventBus, canvas, elementFactory, elementRegistry) {
this._eventBus = eventBus;
this._canvas = canvas;
this._elementFactory = elementFactory;
this._elementRegistry = elementRegistry;
}
BpmnImporter.$inject = [ 'eventBus', 'canvas', 'elementFactory', 'elementRegistry' ];
module.exports = BpmnImporter;
/**
* Add bpmn element (semantic) to the canvas onto the
* specified parent shape.
*/
BpmnImporter.prototype.add = function(semantic, parentElement) {
var di = semantic.di,
element;
// ROOT ELEMENT
// handle the special case that we deal with a
// invisible root element (process or collaboration)
if (di.$instanceOf('bpmndi:BPMNPlane')) {
// add a virtual element (not being drawn)
element = this._elementFactory.createRoot(elementData(semantic));
this._canvas.setRootElement(element);
}
// SHAPE
else if (di.$instanceOf('bpmndi:BPMNShape')) {
var collapsed = !isExpanded(semantic);
var hidden = parentElement && (parentElement.hidden || parentElement.collapsed);
var bounds = semantic.di.bounds;
element = this._elementFactory.createShape(elementData(semantic, {
collapsed: collapsed,
hidden: hidden,
x: Math.round(bounds.x),
y: Math.round(bounds.y),
width: Math.round(bounds.width),
height: Math.round(bounds.height)
}));
if (is(semantic, 'bpmn:BoundaryEvent')) {
this._attachBoundary(semantic, element);
}
this._canvas.addShape(element, parentElement);
}
// CONNECTION
else if (di.$instanceOf('bpmndi:BPMNEdge')) {
var source = this._getSource(semantic),
target = this._getTarget(semantic);
element = this._elementFactory.createConnection(elementData(semantic, {
source: source,
target: target,
waypoints: collectWaypoints(semantic.di.waypoint)
}));
this._canvas.addConnection(element, parentElement);
} else {
throw new Error('unknown di ' + elementToString(di) + ' for element ' + elementToString(semantic));
}
// (optional) LABEL
if (hasExternalLabel(semantic)) {
this.addLabel(semantic, element);
}
this._eventBus.fire('bpmnElement.added', { element: element });
return element;
};
/**
* Attach the boundary element to the given host
*
* @param {ModdleElement} boundarySemantic
* @param {djs.model.Base} boundaryElement
*/
BpmnImporter.prototype._attachBoundary = function(boundarySemantic, boundaryElement) {
var hostSemantic = boundarySemantic.attachedToRef;
if (!hostSemantic) {
throw new Error('missing ' + elementToString(boundarySemantic) + '#attachedToRef');
}
var host = this._elementRegistry.get(hostSemantic.id),
attachers = host && host.attachers;
if (!host) {
throw notYetDrawn(boundarySemantic, hostSemantic, 'attachedToRef');
}
// wire element.host <> host.attachers
boundaryElement.host = host;
if (!attachers) {
host.attachers = attachers = [];
}
if (attachers.indexOf(boundaryElement) === -1) {
attachers.push(boundaryElement);
}
};
/**
* add label for an element
*/
BpmnImporter.prototype.addLabel = function(semantic, element) {
var bounds = getExternalLabelBounds(semantic, element);
var label = this._elementFactory.createLabel(elementData(semantic, {
id: semantic.id + '_label',
labelTarget: element,
type: 'label',
hidden: element.hidden || !semantic.name,
x: Math.round(bounds.x),
y: Math.round(bounds.y),
width: Math.round(bounds.width),
height: Math.round(bounds.height)
}));
return this._canvas.addShape(label, element.parent);
};
/**
* Return the drawn connection end based on the given side.
*
* @throws {Error} if the end is not yet drawn
*/
BpmnImporter.prototype._getEnd = function(semantic, side) {
var element,
refSemantic,
type = semantic.$type;
refSemantic = semantic[side + 'Ref'];
// handle mysterious isMany DataAssociation#sourceRef
if (side === 'source' && type === 'bpmn:DataInputAssociation') {
refSemantic = refSemantic && refSemantic[0];
}
// fix source / target for DataInputAssociation / DataOutputAssociation
if (side === 'source' && type === 'bpmn:DataOutputAssociation' ||
side === 'target' && type === 'bpmn:DataInputAssociation') {
refSemantic = semantic.$parent;
}
element = refSemantic && this._getElement(refSemantic);
if (element) {
return element;
}
if (refSemantic) {
throw notYetDrawn(semantic, refSemantic, side + 'Ref');
} else {
throw new Error(elementToString(semantic) + '#' + side + 'Ref not specified');
}
};
BpmnImporter.prototype._getSource = function(semantic) {
return this._getEnd(semantic, 'source');
};
BpmnImporter.prototype._getTarget = function(semantic) {
return this._getEnd(semantic, 'target');
};
BpmnImporter.prototype._getElement = function(semantic) {
return this._elementRegistry.get(semantic.id);
};