@aeternity/aepp-sdk/es/utils/MiddlewarePage.js

SDK for the æternity blockchain

function _classPrivateFieldInitSpec(e, t, a) { _checkPrivateRedeclaration(e, t), t.set(e, a); }
function _checkPrivateRedeclaration(e, t) { if (t.has(e)) throw new TypeError("Cannot initialize the same private elements twice on an object"); }
function _classPrivateFieldGet(s, a) { return s.get(_assertClassBrand(s, a)); }
function _classPrivateFieldSet(s, a, r) { return s.set(_assertClassBrand(s, a), r), r; }
function _assertClassBrand(e, t, n) { if ("function" == typeof e ? e === t : e.has(t)) return arguments.length < 3 ? t : n; throw new TypeError("Private element is not present on this object"); }
/* eslint-disable max-classes-per-file */

import { BaseError } from './errors.js';
export function isMiddlewareRawPage(maybePage) {
  const testPage = maybePage;
  return testPage?.data != null && Array.isArray(testPage.data) && 'next' in testPage && 'prev' in testPage;
}

/**
 * @category exception
 */
export class MiddlewarePageMissed extends BaseError {
  constructor(isNext) {
    super(`There is no ${isNext ? 'next' : 'previous'} page`);
    this.name = 'MiddlewarePageMissed';
  }
}

/**
 * A wrapper around the middleware's page allowing to get the next/previous pages.
 */
var _middleware = /*#__PURE__*/new WeakMap();
export class MiddlewarePage {
  constructor(rawPage, middleware) {
    _classPrivateFieldInitSpec(this, _middleware, void 0);
    this.data = rawPage.data;
    this.nextPath = rawPage.next;
    this.prevPath = rawPage.prev;
    _classPrivateFieldSet(_middleware, this, middleware);
  }

  /**
   * Get the next page.
   * Check the presence of `nextPath` to not fall outside existing pages.
   * @throws MiddlewarePageMissed
   */
  async next() {
    if (this.nextPath == null) throw new MiddlewarePageMissed(true);
    return _classPrivateFieldGet(_middleware, this).requestByPath(this.nextPath);
  }

  /**
   * Get the previous page.
   * Check the presence of `prevPath` to not fall outside existing pages.
   * @throws MiddlewarePageMissed
   */
  async prev() {
    if (this.prevPath == null) throw new MiddlewarePageMissed(false);
    return _classPrivateFieldGet(_middleware, this).requestByPath(this.prevPath);
  }
}
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