angular/modules/@angular/compiler/src/view_resolver.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Injectable, ViewMetadata, ComponentMetadata,} from '@angular/core';
import {ReflectorReader, reflector} from '../core_private';
import {Type, stringify, isBlank, isPresent} from '../src/facade/lang';
import {BaseException} from '../src/facade/exceptions';

function _isComponentMetadata(obj: any): obj is ComponentMetadata {
  return obj instanceof ComponentMetadata;
}

/**
 * Resolves types to {@link ViewMetadata}.
 */
@Injectable()
export class ViewResolver {
  constructor(private _reflector: ReflectorReader = reflector) {}

  resolve(component: Type): ViewMetadata {
    const compMeta: ComponentMetadata =
        this._reflector.annotations(component).find(_isComponentMetadata);

    if (isPresent(compMeta)) {
      if (isBlank(compMeta.template) && isBlank(compMeta.templateUrl)) {
        throw new BaseException(
            `Component '${stringify(component)}' must have either 'template' or 'templateUrl' set.`);

      } else {
        return new ViewMetadata({
          templateUrl: compMeta.templateUrl,
          template: compMeta.template,
          directives: compMeta.directives,
          pipes: compMeta.pipes,
          encapsulation: compMeta.encapsulation,
          styles: compMeta.styles,
          styleUrls: compMeta.styleUrls,
          animations: compMeta.animations,
          interpolation: compMeta.interpolation
        });
      }
    } else {
      throw new BaseException(
          `Could not compile '${stringify(component)}' because it is not a component.`);
    }
  }
}