| 1 | // Copyright (c) Jupyter Development Team.
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| 2 | // Distributed under the terms of the Modified BSD License.
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| 3 | /*-----------------------------------------------------------------------------
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| 4 | | Copyright (c) 2014-2017, PhosphorJS Contributors
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| 5 | |
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| 6 | | Distributed under the terms of the BSD 3-Clause License.
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| 7 | |
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| 8 | | The full license is in the file LICENSE, distributed with this software.
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| 9 | |----------------------------------------------------------------------------*/
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| 10 |
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| 11 | /**
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| 12 | * A class which wraps a promise into a delegate object.
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| 13 | *
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| 14 | * #### Notes
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| 15 | * This class is useful when the logic to resolve or reject a promise
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| 16 | * cannot be defined at the point where the promise is created.
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| 17 | */
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| 18 | export class PromiseDelegate<T> {
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| 19 | /**
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| 20 | * Construct a new promise delegate.
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| 21 | */
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| 22 | constructor() {
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| 23 | this.promise = new Promise<T>((resolve, reject) => {
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| 24 | this._resolve = resolve;
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| 25 | this._reject = reject;
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| 26 | });
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| 27 | }
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| 28 |
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| 29 | /**
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| 30 | * The promise wrapped by the delegate.
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| 31 | */
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| 32 | readonly promise: Promise<T>;
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| 33 |
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| 34 | /**
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| 35 | * Resolve the wrapped promise with the given value.
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| 36 | *
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| 37 | * @param value - The value to use for resolving the promise.
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| 38 | */
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| 39 | resolve(value: T | PromiseLike<T>): void {
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| 40 | let resolve = this._resolve;
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| 41 | resolve(value);
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| 42 | }
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| 43 |
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| 44 | /**
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| 45 | * Reject the wrapped promise with the given value.
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| 46 | *
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| 47 | * @reason - The reason for rejecting the promise.
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| 48 | */
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| 49 | reject(reason: any): void {
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| 50 | let reject = this._reject;
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| 51 | reject(reason);
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| 52 | }
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| 53 |
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| 54 | private _resolve: (value: T | PromiseLike<T>) => void;
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| 55 | private _reject: (reason: any) => void;
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| 56 | }
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