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Текущая директория: /opt/BitGoJS/node_modules/@hashgraph/sdk/lib/transaction
Просмотр файла: List.cjs

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
/*-
 * ‌
 * Hedera JavaScript SDK
 * 
 * Copyright (C) 2020 - 2022 Hedera Hashgraph, LLC
 * 
 * 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.
 * ‍
 */

/**
 * A custom list type which round robins, supports locking, and as additional
 * QoL improvements.
 *
 * @template {any} T
 */
class List {
  constructor() {
    /** @type {T[]} */
    this.list = [];
    this.locked = false;
    this.index = 0;
  }

  /**
   * Overwrite the entire list.
   *
   * @throws if the list is locked
   * @param {T[]} list
   * @returns {this}
   */
  setList(list) {
    if (this.locked) {
      throw new Error("list is locked");
    }
    this.list = list;
    this.index = 0;
    return this;
  }

  /**
   * Push items to the end of the list.
   *
   * @throws if the list is locked
   * @param {T[]} items
   * @returns {this}
   */
  push(...items) {
    if (this.locked) {
      throw new Error("list is locked");
    }
    this.list.push(...items);
    return this;
  }

  /**
   * Locks the list.
   *
   * @returns {this}
   */
  setLocked() {
    this.locked = true;
    return this;
  }

  /**
   * Clear the list
   */
  clear() {
    this.list = [];
    this.index = 0;
  }

  /**
   * The get value at a particular index.
   *
   * @param {number} index
   * @returns {T}
   */
  get(index) {
    return this.list[index];
  }

  /**
   * Set value at index
   *
   * @param {number} index
   * @param {T} item
   * @returns {this}
   */
  set(index, item) {
    // QoL: If the index is at the end simply push the element to the end
    if (index === this.length) {
      this.list.push(item);
    } else {
      this.list[index] = item;
    }
    return this;
  }

  /**
   * Set value at index if it's not already set
   *
   * @throws if the list is locked
   * @param {number} index
   * @param {() => T} lambda
   * @returns {this}
   */
  setIfAbsent(index, lambda) {
    if (index == this.length || this.list[index] == null) {
      this.set(index, lambda());
    }
    return this;
  }

  /**
   * Get the current value, and advance the index
   *
   * @returns {T}
   */
  get next() {
    return this.get(this.advance());
  }

  /**
   * Get the current value.
   *
   * @returns {T}
   */
  get current() {
    return this.get(this.index);
  }

  /**
   * Advance the index to the next element in a round robin fashion
   *
   * @returns {number}
   */
  advance() {
    const index = this.index;
    this.index = (this.index + 1) % this.list.length;
    return index;
  }

  /**
   * Is the list empty
   *
   * @returns {boolean}
   */
  get isEmpty() {
    return this.length === 0;
  }

  /**
   * Get the length of the list
   *
   * @returns {number}
   */
  get length() {
    return this.list.length;
  }

  /**
   * Shallow clone this list.
   * Perhaps we should explicitly call this `shallowClone()` since it doesn't
   * clone the list inside?
   *
   * @returns {List<T>}
   */
  clone() {
    /** @type {List<T>} */
    const list = new List();
    list.list = this.list;
    list.locked = this.locked;
    return list;
  }
}
exports.default = List;
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