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https://github.com/classilla/tenfourfox.git
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106 lines
2.4 KiB
JavaScript
106 lines
2.4 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["FolderCache"];
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// Cache for bookmarks folder heirarchy.
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var FolderCache = function () {
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this.cache = new Map();
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}
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FolderCache.prototype = {
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has: function (id) {
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return this.cache.has(id);
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},
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insert: function (id, parentId) {
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if (this.cache.has(id)) {
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return;
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}
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if (parentId && !(this.cache.has(parentId))) {
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throw new Error("insert :: parentId not found in cache: " + parentId);
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}
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this.cache.set(id, {
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parent: parentId || null,
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children: new Set(),
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});
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if (parentId) {
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this.cache.get(parentId).children.add(id);
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}
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},
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remove: function (id) {
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if (!(this.cache.has(id))) {
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throw new Error("remote :: id not found in cache: " + id);
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}
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let parentId = this.cache.get(id).parent;
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if (parentId) {
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this.cache.get(parentId).children.delete(id);
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}
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for (let child of this.cache.get(id).children) {
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this.cache.get(child).parent = null;
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}
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this.cache.delete(id);
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},
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setParent: function (id, parentId) {
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if (!(this.cache.has(id))) {
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throw new Error("setParent :: id not found in cache: " + id);
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}
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if (parentId && !(this.cache.has(parentId))) {
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throw new Error("setParent :: parentId not found in cache: " + parentId);
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}
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let oldParent = this.cache.get(id).parent;
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if (oldParent) {
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this.cache.get(oldParent).children.delete(id);
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}
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this.cache.get(id).parent = parentId;
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this.cache.get(parentId).children.add(id);
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return true;
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},
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getParent: function (id) {
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if (this.cache.has(id)) {
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return this.cache.get(id).parent;
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}
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throw new Error("getParent :: id not found in cache: " + id);
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},
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getChildren: function (id) {
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if (this.cache.has(id)) {
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return this.cache.get(id).children;
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}
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throw new Error("getChildren :: id not found in cache: " + id);
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},
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setChildren: function (id, children) {
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for (let child of children) {
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if (!this.cache.has(child)) {
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this.insert(child, id);
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} else {
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this.setParent(child, id);
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}
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}
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},
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dump: function () {
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dump("FolderCache: " + JSON.stringify(this.cache) + "\n");
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},
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};
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this.FolderCache = FolderCache;
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