111 lines
2.9 KiB
JavaScript
111 lines
2.9 KiB
JavaScript
/**
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* @licstart The following is the entire license notice for the
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* JavaScript code in this page
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*
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* Copyright 2022 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @licend The above is the entire license notice for the
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* JavaScript code in this page
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*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.ViewHistory = void 0;
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const DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20;
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class ViewHistory {
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constructor(fingerprint, cacheSize = DEFAULT_VIEW_HISTORY_CACHE_SIZE) {
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this.fingerprint = fingerprint;
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this.cacheSize = cacheSize;
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this._initializedPromise = this._readFromStorage().then(databaseStr => {
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const database = JSON.parse(databaseStr || "{}");
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let index = -1;
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if (!Array.isArray(database.files)) {
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database.files = [];
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} else {
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while (database.files.length >= this.cacheSize) {
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database.files.shift();
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}
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for (let i = 0, ii = database.files.length; i < ii; i++) {
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const branch = database.files[i];
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if (branch.fingerprint === this.fingerprint) {
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index = i;
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break;
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}
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}
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}
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if (index === -1) {
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index = database.files.push({
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fingerprint: this.fingerprint
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}) - 1;
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}
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this.file = database.files[index];
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this.database = database;
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});
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}
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async _writeToStorage() {
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const databaseStr = JSON.stringify(this.database);
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localStorage.setItem("pdfjs.history", databaseStr);
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}
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async _readFromStorage() {
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return localStorage.getItem("pdfjs.history");
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}
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async set(name, val) {
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await this._initializedPromise;
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this.file[name] = val;
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return this._writeToStorage();
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}
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async setMultiple(properties) {
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await this._initializedPromise;
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for (const name in properties) {
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this.file[name] = properties[name];
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}
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return this._writeToStorage();
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}
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async get(name, defaultValue) {
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await this._initializedPromise;
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const val = this.file[name];
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return val !== undefined ? val : defaultValue;
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}
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async getMultiple(properties) {
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await this._initializedPromise;
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const values = Object.create(null);
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for (const name in properties) {
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const val = this.file[name];
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values[name] = val !== undefined ? val : properties[name];
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}
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return values;
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}
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}
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exports.ViewHistory = ViewHistory; |