interface_sdk-js/api/@ohos.util.Queue.d.ts

/*
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * 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.
 */

/**
 * @file
 * @kit ArkTS
 */

/**
 * Queue follows the principle of First In First Out (FIFO). 
 * It supports insertion of elements at the end and removal from the front of the queue. 
 * Queue is implemented based on the queue data structure. 
 *
 * @syscap SystemCapability.Utils.Lang
 * @since 8
 */
/**
 * Queue follows the principle of First In First Out (FIFO). 
 * It supports insertion of elements at the end and removal from the front of the queue. 
 * Queue is implemented based on the queue data structure. 
 *
 * @syscap SystemCapability.Utils.Lang
 * @crossplatform
 * @since 10
 */
declare class Queue<T> {
  /**
   * A constructor used to create a Queue object.
   *
   * @throws { BusinessError } 10200012 - The Queue's constructor cannot be directly invoked.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * A constructor used to create a Queue object.
   *
   * @throws { BusinessError } 10200012 - The Queue's constructor cannot be directly invoked.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  constructor();
  /**
   * Gets the element number of the Queue.This is a number one higher than the highest index in the queue.
   *
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * Gets the element number of the Queue.This is a number one higher than the highest index in the queue.
   *
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  length: number;
  /**
   * Inserting specified element at the end of a queue if it is possible to do
   * so immediately without violating capacity restrictions.
   *
   * @param { T } element - element element to be appended to this queue
   * @returns { boolean } the boolean type
   * @throws { BusinessError } 10200011 - The add method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * Inserting specified element at the end of a queue if it is possible to do
   * so immediately without violating capacity restrictions.
   *
   * @param { T } element - element element to be appended to this queue
   * @returns { boolean } the boolean type
   * @throws { BusinessError } 10200011 - The add method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  add(element: T): boolean;
  /**
   * Obtains the header element of a queue.
   *
   * @returns { T } the T type
   * @throws { BusinessError } 10200011 - The getFirst method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * Obtains the header element of a queue.
   *
   * @returns { T } the T type
   * @throws { BusinessError } 10200011 - The getFirst method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  getFirst(): T;
  /**
   * Retrieves and removes the head of this queue
   *
   * @returns { T } the T type
   * @throws { BusinessError } 10200011 - The pop method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * Retrieves and removes the head of this queue
   *
   * @returns { T } the T type
   * @throws { BusinessError } 10200011 - The pop method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  pop(): T;
  /**
   * Executes a provided function once for each value in the queue object.
   *
   * @param { function } callbackFn - callbackFn
   * callbackFn (required) A function that accepts up to three arguments.
   * The function to be called for each element.
   * @param { Object } [thisArg] - thisArg
   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
   * If thisArg is omitted, undefined is used as the this value.
   * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
   * @throws { BusinessError } 401 - Parameter error. Possible causes:
   * 1.Mandatory parameters are left unspecified;
   * 2.Incorrect parameter types.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * Executes a provided function once for each value in the queue object.
   *
   * @param { function } callbackFn - callbackFn
   * callbackFn (required) A function that accepts up to three arguments.
   * The function to be called for each element.
   * @param { Object } [thisArg] - thisArg
   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
   * If thisArg is omitted, undefined is used as the this value.
   * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
   * @throws { BusinessError } 401 - Parameter error. Possible causes:
   * 1.Mandatory parameters are left unspecified;
   * 2.Incorrect parameter types.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  forEach(callbackFn: (value: T, index?: number, Queue?: Queue<T>) => void, thisArg?: Object): void;
  /**
   * returns an iterator.Each item of the iterator is a Javascript Object
   *
   * @returns { IterableIterator<T> }
   * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @since 8
   */
  /**
   * returns an iterator.Each item of the iterator is a Javascript Object
   *
   * @returns { IterableIterator<T> }
   * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @since 10
   */
  [Symbol.iterator](): IterableIterator<T>;
}

export default Queue;