import {ElementRef, ElementRef_} from './element_ref';

/**
 * Represents an Embedded Template that can be used to instantiate Embedded Views.
 *
 * You can access a `TemplateRef`, in two ways. Via a directive placed on a `<template>` element (or
 * directive prefixed with `*`) and have the `TemplateRef` for this Embedded View injected into the
 * constructor of the directive using the `TemplateRef` Token. Alternatively you can query for the
 * `TemplateRef` from a Component or a Directive via {@link Query}.
 *
 * To instantiate Embedded Views based on a Template, use
 * {@link ViewContainerRef#createEmbeddedView}, which will create the View and attach it to the
 * View Container.
 */
export abstract class TemplateRef {
  /**
   * The location in the View where the Embedded View logically belongs to.
   *
   * The data-binding and injection contexts of Embedded Views created from this `TemplateRef`
   * inherit from the contexts of this location.
   *
   * Typically new Embedded Views are attached to the View Container of this location, but in
   * advanced use-cases, the View can be attached to a different container while keeping the
   * data-binding and injection context from the original location.
   *
   */
  // TODO(i): rename to anchor or location
  get elementRef(): ElementRef { return null; }
}

export class TemplateRef_ extends TemplateRef {
  constructor(private _elementRef: ElementRef_) { super(); }

  get elementRef(): ElementRef_ { return this._elementRef; }
}