var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Directive, ViewContainerRef, TemplateRef } from 'angular2/core';
import { isBlank } from 'angular2/src/facade/lang';
/**
 * Removes or recreates a portion of the DOM tree based on an {expression}.
 *
 * If the expression assigned to `ngIf` evaluates to a false value then the element
 * is removed from the DOM, otherwise a clone of the element is reinserted into the DOM.
 *
 * ### Example ([live demo](http://plnkr.co/edit/fe0kgemFBtmQOY31b4tw?p=preview)):
 *
 * ```
 * <div *ngIf="errorCount > 0" class="error">
 *   <!-- Error message displayed when the errorCount property on the current context is greater
 * than 0. -->
 *   {{errorCount}} errors detected
 * </div>
 * ```
 *
 * ### Syntax
 *
 * - `<div *ngIf="condition">...</div>`
 * - `<div template="ngIf condition">...</div>`
 * - `<template [ngIf]="condition"><div>...</div></template>`
 */
export let NgIf = class {
    constructor(_viewContainer, _templateRef) {
        this._viewContainer = _viewContainer;
        this._templateRef = _templateRef;
        this._prevCondition = null;
    }
    set ngIf(newCondition /* boolean */) {
        if (newCondition && (isBlank(this._prevCondition) || !this._prevCondition)) {
            this._prevCondition = true;
            this._viewContainer.createEmbeddedView(this._templateRef);
        }
        else if (!newCondition && (isBlank(this._prevCondition) || this._prevCondition)) {
            this._prevCondition = false;
            this._viewContainer.clear();
        }
    }
};
NgIf = __decorate([
    Directive({ selector: '[ngIf]', inputs: ['ngIf'] }), 
    __metadata('design:paramtypes', [ViewContainerRef, TemplateRef])
], NgIf);
