/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
export class SetMap {
    constructor() {
        this.map = new Map();
    }
    add(key, value) {
        let values = this.map.get(key);
        if (!values) {
            values = new Set();
            this.map.set(key, values);
        }
        values.add(value);
    }
    delete(key, value) {
        const values = this.map.get(key);
        if (!values) {
            return;
        }
        values.delete(value);
        if (values.size === 0) {
            this.map.delete(key);
        }
    }
    forEach(key, fn) {
        const values = this.map.get(key);
        if (!values) {
            return;
        }
        values.forEach(fn);
    }
    get(key) {
        const values = this.map.get(key);
        if (!values) {
            return new Set();
        }
        return values;
    }
}