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(function() {
var Y = YAHOO.util,
YL = YAHOO.lang;
/**
* The StorageEngineKeyed class implements the interface necessary for managing keys.
* @namespace YAHOO.util
* @class StorageEngineKeyed
* @constructor
* @extend YAHOO.util.Storage
*/
Y.StorageEngineKeyed = function() {
Y.StorageEngineKeyed.superclass.constructor.apply(this, arguments);
this._keys = [];
this._keyMap = {};
};
YL.extend(Y.StorageEngineKeyed, Y.Storage, {
/**
* A collection of keys applicable to the current location. This should never be edited by the developer.
* @property _keys
* @type {Array}
* @protected
*/
_keys: null,
/**
* A map of keys to their applicable position in keys array. This should never be edited by the developer.
* @property _keyMap
* @type {Object}
* @protected
*/
_keyMap: null,
/**
* Adds the key to the set.
* @method _addKey
* @param key {String} Required. The key to evaluate.
* @protected
*/
_addKey: function(key) {
this._keyMap[key] = this.length;
this._keys.push(key);
this.length = this._keys.length;
},
/**
* Evaluates if a key exists in the keys array; indexOf does not work in all flavors of IE.
* @method _indexOfKey
* @param key {String} Required. The key to evaluate.
* @protected
*/
_indexOfKey: function(key) {
var i = this._keyMap[key];
return undefined === i ? -1 : i;
},
/**
* Removes a key from the keys array.
* @method _removeKey
* @param key {String} Required. The key to remove.
* @protected
*/
_removeKey: function(key) {
var j = this._indexOfKey(key),
rest = this._keys.slice(j + 1);
delete this._keyMap[key];
for (var k in this._keyMap) {
if (j < this._keyMap[k]) {
this._keyMap[k] -= 1;
}
}
this._keys.length = j;
this._keys = this._keys.concat(rest);
this.length = this._keys.length;
}
});
}());