angular2/atscript/src/core/compiler/directive_metadata_reader.js

Angular 2 - a web framework for modern web apps

import {Injectable, Injector} from 'angular2/di';
import {Type, isPresent, BaseException, stringify} from 'angular2/src/facade/lang';
import {Directive, Component} from '../annotations/annotations';
import {DirectiveMetadata} from './directive_metadata';
import {reflector} from 'angular2/src/reflection/reflection';

@Injectable()
export class DirectiveMetadataReader {
  read(type:Type):DirectiveMetadata {
    var annotations = reflector.annotations(type);
    if (isPresent(annotations)) {
      for (var i=0; i<annotations.length; i++) {
        var annotation = annotations[i];

        if (annotation instanceof Directive) {
          var resolvedInjectables = null;
          if (annotation instanceof Component && isPresent(annotation.injectables)) {
            resolvedInjectables = Injector.resolve(annotation.injectables);
          }
          return new DirectiveMetadata(type, annotation, resolvedInjectables);
        }
      }
    }
    throw new BaseException(`No Directive annotation found on ${stringify(type)}`);
  }

}