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src/vs/workbench/services/extensions/node/lazyPromise.ts
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/*--------------------------------------------------------------------------------------------- | ||
* Copyright (c) Microsoft Corporation. All rights reserved. | ||
* Licensed under the MIT License. See License.txt in the project root for license information. | ||
*--------------------------------------------------------------------------------------------*/ | ||
'use strict'; | ||
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import { TPromise, ValueCallback, ErrorCallback } from 'vs/base/common/winjs.base'; | ||
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export class LazyPromise { | ||
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private _onCancel: () => void; | ||
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private _actual: TPromise<any>; | ||
private _actualOk: ValueCallback; | ||
private _actualErr: ErrorCallback; | ||
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private _hasValue: boolean; | ||
private _value: any; | ||
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private _hasErr: boolean; | ||
private _err: any; | ||
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private _isCanceled: boolean; | ||
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constructor(onCancel: () => void) { | ||
this._onCancel = onCancel; | ||
this._actual = null; | ||
this._actualOk = null; | ||
this._actualErr = null; | ||
this._hasValue = false; | ||
this._value = null; | ||
this._hasErr = false; | ||
this._err = null; | ||
this._isCanceled = false; | ||
} | ||
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private _ensureActual(): TPromise<any> { | ||
if (!this._actual) { | ||
this._actual = new TPromise<any>((c, e) => { | ||
this._actualOk = c; | ||
this._actualErr = e; | ||
}, this._onCancel); | ||
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if (this._hasValue) { | ||
this._actualOk(this._value); | ||
} | ||
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if (this._hasErr) { | ||
this._actualErr(this._err); | ||
} | ||
} | ||
return this._actual; | ||
} | ||
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public resolveOk(value: any): void { | ||
if (this._isCanceled || this._hasErr) { | ||
return; | ||
} | ||
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this._hasValue = true; | ||
this._value = value; | ||
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if (this._actual) { | ||
this._actualOk(value); | ||
} | ||
} | ||
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public resolveErr(err: any): void { | ||
if (this._isCanceled || this._hasValue) { | ||
return; | ||
} | ||
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this._hasErr = true; | ||
this._err = err; | ||
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if (this._actual) { | ||
this._actualErr(err); | ||
} | ||
} | ||
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public then(success: any, error: any): any { | ||
if (this._isCanceled) { | ||
return; | ||
} | ||
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return this._ensureActual().then(success, error); | ||
} | ||
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public done(success: any, error: any): void { | ||
if (this._isCanceled) { | ||
return; | ||
} | ||
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this._ensureActual().done(success, error); | ||
} | ||
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public cancel(): void { | ||
if (this._hasValue || this._hasErr) { | ||
return; | ||
} | ||
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this._isCanceled = true; | ||
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if (this._actual) { | ||
this._actual.cancel(); | ||
} else { | ||
this._onCancel(); | ||
} | ||
} | ||
} |