127 lines
2.8 KiB
JavaScript
127 lines
2.8 KiB
JavaScript
/*
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*
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* Copyright (c) 2008-2009, Felix Bruns <felixbruns@web.de>
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*
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*/
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/* Set an object on a Storage object. */
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Storage.prototype.setObject = function(key, value){
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this.setItem(key, JSON.stringify(value));
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}
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/* Get an object from a Storage object. */
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Storage.prototype.getObject = function(key){
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var item = this.getItem(key);
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return JSON.parse(item);
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}
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/* Creates a new cache object. */
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function LastFMCache(){
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/* Expiration times. */
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var MINUTE = 60;
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var HOUR = MINUTE * 60;
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var DAY = HOUR * 24;
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var WEEK = DAY * 7;
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var MONTH = WEEK * 4.34812141;
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var YEAR = MONTH * 12;
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/* Methods with weekly expiration. */
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var weeklyMethods = [
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'artist.getSimilar',
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'tag.getSimilar',
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'track.getSimilar',
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'artist.getTopAlbums',
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'artist.getTopTracks',
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'geo.getTopArtists',
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'geo.getTopTracks',
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'tag.getTopAlbums',
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'tag.getTopArtists',
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'tag.getTopTags',
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'tag.getTopTracks',
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'user.getTopAlbums',
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'user.getTopArtists',
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'user.getTopTags',
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'user.getTopTracks'
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];
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/* Name for this cache. */
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var name = 'lastfm';
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/* Create cache if it doesn't exist yet. */
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if(localStorage.getObject(name) == null){
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localStorage.setObject(name, {});
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}
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/* Get expiration time for given parameters. */
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this.getExpirationTime = function(params){
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var method = params.method;
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if((/Weekly/).test(method) && !(/List/).test(method)){
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if(typeof(params.to) != 'undefined' && typeof(params.from) != 'undefined'){
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return YEAR;
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}
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else{
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return WEEK;
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}
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}
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for(var key in this.weeklyMethods){
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if(method == this.weeklyMethods[key]){
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return WEEK;
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}
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}
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return -1;
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};
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/* Check if this cache contains specific data. */
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this.contains = function(hash){
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return typeof(localStorage.getObject(name)[hash]) != 'undefined' &&
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typeof(localStorage.getObject(name)[hash].data) != 'undefined';
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};
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/* Load data from this cache. */
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this.load = function(hash){
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return localStorage.getObject(name)[hash].data;
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};
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/* Remove data from this cache. */
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this.remove = function(hash){
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var object = localStorage.getObject(name);
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object[hash] = undefined;
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localStorage.setObject(name, object);
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};
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/* Store data in this cache with a given expiration time. */
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this.store = function(hash, data, expiration){
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var object = localStorage.getObject(name);
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var time = Math.round(new Date().getTime() / 1000);
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object[hash] = {
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data : data,
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expiration : time + expiration
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};
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localStorage.setObject(name, object);
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};
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/* Check if some specific data expired. */
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this.isExpired = function(hash){
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var object = localStorage.getObject(name);
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var time = Math.round(new Date().getTime() / 1000);
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if(time > object[hash].expiration){
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return true;
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}
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return false;
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};
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/* Clear this cache. */
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this.clear = function(){
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localStorage.setObject(name, {});
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};
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}; |