node-webodf
Version:
WebODF - JavaScript Document Engine http://webodf.org/
62 lines (56 loc) • 1.85 kB
JavaScript
/**
* Copyright (C) 2010-2014 KO GmbH <copyright@kogmbh.com>
*
* @licstart
* This file is part of WebODF.
*
* WebODF is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License (GNU AGPL)
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* WebODF is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with WebODF. If not, see <http://www.gnu.org/licenses/>.
* @licend
*
* @source: http://www.webodf.org/
* @source: https://github.com/kogmbh/WebODF/
*/
/*global core*/
// TODO Apparently newer closure compilers do a better job with generics
/**
* Lazily loaded property. The value is loaded using the valueLoader and cached
* the first time it's requested. Subsequent requests will return the cached value.
* Calling reset will clear the cached value, causing the next value request
* to load a new value via the valueLoader.
*
* @constructor
* @template T
* @param {!function():Object} valueLoader Property value loader
*/
core.LazyProperty = function (valueLoader) {
"use strict";
var cachedValue,
valueLoaded = false;
/**
* @return {T}
*/
this.value = function() {
if (!valueLoaded) {
cachedValue = valueLoader();
valueLoaded = true;
}
return cachedValue;
};
/**
* @return {undefined}
*/
this.reset = function() {
valueLoaded = false;
};
};