Merge from vscode 2cd495805cf99b31b6926f08ff4348124b2cf73d

extensions/github-browser/src/contextStore.ts

@@ -0,0 +1,36 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+import { Event, EventEmitter, Memento, Uri } from 'vscode';
+
+export const contextKeyPrefix = 'github.context|';
+
+export class ContextStore<T> {
+	private _onDidChange = new EventEmitter<Uri>();
+	get onDidChange(): Event<Uri> {
+		return this._onDidChange.event;
+	}
+
+	constructor(private readonly memento: Memento, private readonly scheme: string) { }
+
+	delete(uri: Uri) {
+		return this.set(uri, undefined);
+	}
+
+	get(uri: Uri): T | undefined {
+		return this.memento.get<T>(`${contextKeyPrefix}${uri.toString()}`);
+	}
+
+
+	async set(uri: Uri, context: T | undefined) {
+		if (uri.scheme !== this.scheme) {
+			throw new Error(`Invalid context scheme: ${uri.scheme}`);
+		}
+
+		await this.memento.update(`${contextKeyPrefix}${uri.toString()}`, context);
+		this._onDidChange.fire(uri);
+	}
+}