round-robin-array-index.js•1.56 kB
"use strict";
/**
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://neo4j.com]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
var RoundRobinArrayIndex = /** @class */ (function () {
/**
* @constructor
* @param {number} [initialOffset=0] the initial offset for round robin.
*/
function RoundRobinArrayIndex(initialOffset) {
this._offset = initialOffset || 0;
}
/**
* Get next index for an array with given length.
* @param {number} arrayLength the array length.
* @return {number} index in the array.
*/
RoundRobinArrayIndex.prototype.next = function (arrayLength) {
if (arrayLength === 0) {
return -1;
}
var nextOffset = this._offset;
this._offset += 1;
if (this._offset === Number.MAX_SAFE_INTEGER) {
this._offset = 0;
}
return nextOffset % arrayLength;
};
return RoundRobinArrayIndex;
}());
exports.default = RoundRobinArrayIndex;