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 { CONST, stringify, isString } from 'angular2/src/facade/lang';
import { resolveForwardRef } from 'angular2/src/core/di';
import { DependencyMetadata } from 'angular2/src/core/di/metadata';
/**
 * Specifies that a constant attribute value should be injected.
 *
 * The directive can inject constant string literals of host element attributes.
 *
 * ### Example
 *
 * Suppose we have an `<input>` element and want to know its `type`.
 *
 * ```html
 * <input type="text">
 * ```
 *
 * A decorator can inject string literal `text` like so:
 *
 * {@example core/ts/metadata/metadata.ts region='attributeMetadata'}
 */
export let AttributeMetadata = class extends DependencyMetadata {
    constructor(attributeName) {
        super();
        this.attributeName = attributeName;
    }
    get token() {
        // Normally one would default a token to a type of an injected value but here
        // the type of a variable is "string" and we can't use primitive type as a return value
        // so we use instance of Attribute instead. This doesn't matter much in practice as arguments
        // with @Attribute annotation are injected by ElementInjector that doesn't take tokens into
        // account.
        return this;
    }
    toString() { return `@Attribute(${stringify(this.attributeName)})`; }
};
AttributeMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [String])
], AttributeMetadata);
/**
 * Declares an injectable parameter to be a live list of directives or variable
 * bindings from the content children of a directive.
 *
 * ### Example ([live demo](http://plnkr.co/edit/lY9m8HLy7z06vDoUaSN2?p=preview))
 *
 * Assume that `<tabs>` component would like to get a list its children `<pane>`
 * components as shown in this example:
 *
 * ```html
 * <tabs>
 *   <pane title="Overview">...</pane>
 *   <pane *ngFor="#o of objects" [title]="o.title">{{o.text}}</pane>
 * </tabs>
 * ```
 *
 * The preferred solution is to query for `Pane` directives using this decorator.
 *
 * ```javascript
 * @Component({
 *   selector: 'pane',
 *   inputs: ['title']
 * })
 * class Pane {
 *   title:string;
 * }
 *
 * @Component({
 *  selector: 'tabs',
 *  template: `
 *    <ul>
 *      <li *ngFor="#pane of panes">{{pane.title}}</li>
 *    </ul>
 *    <content></content>
 *  `
 * })
 * class Tabs {
 *   panes: QueryList<Pane>;
 *   constructor(@Query(Pane) panes:QueryList<Pane>) {
  *    this.panes = panes;
  *  }
 * }
 * ```
 *
 * A query can look for variable bindings by passing in a string with desired binding symbol.
 *
 * ### Example ([live demo](http://plnkr.co/edit/sT2j25cH1dURAyBRCKx1?p=preview))
 * ```html
 * <seeker>
 *   <div #findme>...</div>
 * </seeker>
 *
 * @Component({ selector: 'seeker' })
 * class Seeker {
 *   constructor(@Query('findme') elList: QueryList<ElementRef>) {...}
 * }
 * ```
 *
 * In this case the object that is injected depend on the type of the variable
 * binding. It can be an ElementRef, a directive or a component.
 *
 * Passing in a comma separated list of variable bindings will query for all of them.
 *
 * ```html
 * <seeker>
 *   <div #find-me>...</div>
 *   <div #find-me-too>...</div>
 * </seeker>
 *
 *  @Component({
 *   selector: 'seeker'
 * })
 * class Seeker {
 *   constructor(@Query('findMe, findMeToo') elList: QueryList<ElementRef>) {...}
 * }
 * ```
 *
 * Configure whether query looks for direct children or all descendants
 * of the querying element, by using the `descendants` parameter.
 * It is set to `false` by default.
 *
 * ### Example ([live demo](http://plnkr.co/edit/wtGeB977bv7qvA5FTYl9?p=preview))
 * ```html
 * <container #first>
 *   <item>a</item>
 *   <item>b</item>
 *   <container #second>
 *     <item>c</item>
 *   </container>
 * </container>
 * ```
 *
 * When querying for items, the first container will see only `a` and `b` by default,
 * but with `Query(TextDirective, {descendants: true})` it will see `c` too.
 *
 * The queried directives are kept in a depth-first pre-order with respect to their
 * positions in the DOM.
 *
 * Query does not look deep into any subcomponent views.
 *
 * Query is updated as part of the change-detection cycle. Since change detection
 * happens after construction of a directive, QueryList will always be empty when observed in the
 * constructor.
 *
 * The injected object is an unmodifiable live list.
 * See {@link QueryList} for more details.
 */
export let QueryMetadata = class extends DependencyMetadata {
    constructor(_selector, { descendants = false, first = false } = {}) {
        super();
        this._selector = _selector;
        this.descendants = descendants;
        this.first = first;
    }
    /**
     * always `false` to differentiate it with {@link ViewQueryMetadata}.
     */
    get isViewQuery() { return false; }
    /**
     * what this is querying for.
     */
    get selector() { return resolveForwardRef(this._selector); }
    /**
     * whether this is querying for a variable binding or a directive.
     */
    get isVarBindingQuery() { return isString(this.selector); }
    /**
     * returns a list of variable bindings this is querying for.
     * Only applicable if this is a variable bindings query.
     */
    get varBindings() { return this.selector.split(','); }
    toString() { return `@Query(${stringify(this.selector)})`; }
};
QueryMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object, Object])
], QueryMetadata);
// TODO: add an example after ContentChildren and ViewChildren are in master
/**
 * Configures a content query.
 *
 * Content queries are set before the `ngAfterContentInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Directive({
 *   selector: 'someDir'
 * })
 * class SomeDir {
 *   @ContentChildren(ChildDirective) contentChildren: QueryList<ChildDirective>;
 *
 *   ngAfterContentInit() {
 *     // contentChildren is set
 *   }
 * }
 * ```
 */
export let ContentChildrenMetadata = class extends QueryMetadata {
    constructor(_selector, { descendants = false } = {}) {
        super(_selector, { descendants: descendants });
    }
};
ContentChildrenMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object, Object])
], ContentChildrenMetadata);
// TODO: add an example after ContentChild and ViewChild are in master
/**
 * Configures a content query.
 *
 * Content queries are set before the `ngAfterContentInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Directive({
 *   selector: 'someDir'
 * })
 * class SomeDir {
 *   @ContentChild(ChildDirective) contentChild;
 *
 *   ngAfterContentInit() {
 *     // contentChild is set
 *   }
 * }
 * ```
 */
export let ContentChildMetadata = class extends QueryMetadata {
    constructor(_selector) {
        super(_selector, { descendants: true, first: true });
    }
};
ContentChildMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object])
], ContentChildMetadata);
/**
 * Similar to {@link QueryMetadata}, but querying the component view, instead of
 * the content children.
 *
 * ### Example ([live demo](http://plnkr.co/edit/eNsFHDf7YjyM6IzKxM1j?p=preview))
 *
 * ```javascript
 * @Component({...})
 * @View({
 *   template: `
 *     <item> a </item>
 *     <item> b </item>
 *     <item> c </item>
 *   `
 * })
 * class MyComponent {
 *   shown: boolean;
 *
 *   constructor(private @Query(Item) items:QueryList<Item>) {
 *     items.onChange(() => console.log(items.length));
 *   }
 * }
 * ```
 *
 * Supports the same querying parameters as {@link QueryMetadata}, except
 * `descendants`. This always queries the whole view.
 *
 * As `shown` is flipped between true and false, items will contain zero of one
 * items.
 *
 * Specifies that a {@link QueryList} should be injected.
 *
 * The injected object is an iterable and observable live list.
 * See {@link QueryList} for more details.
 */
export let ViewQueryMetadata = class extends QueryMetadata {
    constructor(_selector, { descendants = false, first = false } = {}) {
        super(_selector, { descendants: descendants, first: first });
    }
    /**
     * always `true` to differentiate it with {@link QueryMetadata}.
     */
    get isViewQuery() { return true; }
    toString() { return `@ViewQuery(${stringify(this.selector)})`; }
};
ViewQueryMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object, Object])
], ViewQueryMetadata);
/**
 * Configures a view query.
 *
 * View queries are set before the `ngAfterViewInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Component({
 *   selector: 'someDir',
 *   templateUrl: 'someTemplate',
 *   directives: [ItemDirective]
 * })
 * class SomeDir {
 *   @ViewChildren(ItemDirective) viewChildren: QueryList<ItemDirective>;
 *
 *   ngAfterViewInit() {
 *     // viewChildren is set
 *   }
 * }
 * ```
 */
export let ViewChildrenMetadata = class extends ViewQueryMetadata {
    constructor(_selector) {
        super(_selector, { descendants: true });
    }
};
ViewChildrenMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object])
], ViewChildrenMetadata);
/**
 * Configures a view query.
 *
 * View queries are set before the `ngAfterViewInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Component({
 *   selector: 'someDir',
 *   templateUrl: 'someTemplate',
 *   directives: [ItemDirective]
 * })
 * class SomeDir {
 *   @ViewChild(ItemDirective) viewChild:ItemDirective;
 *
 *   ngAfterViewInit() {
 *     // viewChild is set
 *   }
 * }
 * ```
 */
export let ViewChildMetadata = class extends ViewQueryMetadata {
    constructor(_selector) {
        super(_selector, { descendants: true, first: true });
    }
};
ViewChildMetadata = __decorate([
    CONST(), 
    __metadata('design:paramtypes', [Object])
], ViewChildMetadata);
