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DOMStorageAdaptor.js
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DOMStorageAdaptor.js
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/**
* DOMStorageAdaptor
* ===================
* DOM Storage implementation for Lawnchair.
*
* - originally authored by Joseph Pecoraro
* - window.name code courtesy Remy Sharp: http://24ways.org/2009/breaking-out-the-edges-of-the-browser
*
*/
var DOMStorageAdaptor = function(options) {
for (var i in LawnchairAdaptorHelpers) {
this[i] = LawnchairAdaptorHelpers[i];
}
this.init(options);
};
DOMStorageAdaptor.prototype = {
init:function(options) {
var self = this;
this.storage = this.merge(window.localStorage, options.storage);
this.table = this.merge('field', options.table);
if (!(this.storage instanceof window.Storage)) {
this.storage = (function () {
// window.top.name ensures top level, and supports around 2Mb
var data = window.top.name ? self.deserialize(window.top.name) : {};
return {
setItem: function (key, value) {
data[key] = value+""; // force to string
window.top.name = self.serialize(data);
},
removeItem: function (key) {
delete data[key];
window.top.name = self.serialize(data);
},
getItem: function (key) {
return data[key] || null;
},
clear: function () {
data = {};
window.top.name = '';
}
};
})();
};
},
save:function(obj, callback) {
var id = this.table + '::' + (obj.key || this.uuid());
delete obj.key;
this.storage.setItem(id, this.serialize(obj));
if (callback)
callback(obj);
},
get:function(key, callback) {
var obj = this.deserialize(this.storage.getItem(this.table + '::' + key));
if (obj) {
obj.key = key;
if (callback) callback(obj);
} else {
if (callback) callback(null);
}
},
all:function(callback) {
var cb = this.terseToVerboseCallback(callback);
var results = [];
for (var i = 0, l = this.storage.length; i < l; ++i) {
var id = this.storage.key(i);
var tbl = id.split('::')[0]
var key = id.split('::').slice(1).join("::");
if (tbl == this.table) {
var obj = this.deserialize(this.storage.getItem(id));
obj.key = key;
results.push(obj);
}
}
if (cb)
cb(results);
},
remove:function(keyOrObj, callback) {
var key = this.table + '::' + (typeof keyOrObj === 'string' ? keyOrObj : keyOrObj.key);
this.storage.removeItem(key);
if(callback)
callback();
},
nuke:function(callback) {
var self = this;
this.all(function(r) {
for (var i = 0, l = r.length; i < l; i++) {
self.remove(r[i]);
}
if(callback)
callback();
});
}
};