all files / lib/import/ Importer.js

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import BpmnTreeWalker from './BpmnTreeWalker';
 
 
/**
 * Import the definitions into a diagram.
 *
 * Errors and warnings are reported through the specified callback.
 *
 * @param  {Diagram} diagram
 * @param  {ModdleElement} definitions
 * @param  {Function} done the callback, invoked with (err, [ warning ]) once the import is done
 */
export function importBpmnDiagram(diagram, definitions, done) {
 
  var importer,
      eventBus,
      translate;
 
  var error,
      warnings = [];
 
  /**
   * Walk the diagram semantically, importing (=drawing)
   * all elements you encounter.
   *
   * @param {ModdleElement} definitions
   */
  function render(definitions) {
 
    var visitor = {
 
      root: function(element) {
        return importer.add(element);
      },
 
      element: function(element, parentShape) {
        return importer.add(element, parentShape);
      },
 
      error: function(message, context) {
        warnings.push({ message: message, context: context });
      }
    };
 
    var walker = new BpmnTreeWalker(visitor, translate);
 
    // traverse BPMN 2.0 document model,
    // starting at definitions
    walker.handleDefinitions(definitions);
  }
 
  try {
    importer = diagram.get('bpmnImporter');
    eventBus = diagram.get('eventBus');
    translate = diagram.get('translate');
 
    eventBus.fire('import.render.start', { definitions: definitions });
 
    render(definitions);
 
    eventBus.fire('import.render.complete', {
      error: error,
      warnings: warnings
    });
  } catch (e) {
    error = e;
  }
 
  done(error, warnings);
}