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var LocalStorageCache = function(key, lifetime, loader) {
this.key = key;
this.lifetime = lifetime*1000;
this.loader = loader;
this.storage = window.localStorage;
this.ready = !!this.storage;
};
LocalStorageCache.prototype.get = function(callback) {
var now = new Date().getTime(),
that = this;
if (this.ready && this.storage[this.key] != undefined) {
var cache = JSON.parse(this.storage[this.key]);
if (now - cache.timestamp <= this.lifetime) {
callback(cache.data);
return;
}
}
this.loader(function(data) {
if (that.ready) {
that.storage[that.key] = JSON.stringify({
timestamp: now,
data: data
});
}
callback(data);
});
};
LocalStorageCache.prototype.set = function(data) {
if (this.ready) {
that.storage[that.key] = JSON.stringify({
timestamp: new Date().getTime(),
data: data
});
}
};
LocalStorageCache.prototype.clear = function() {
if (this.ready) {
this.storage.removeItem(this.key);
}
};
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