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attribute  3.3.0pr1

Yahoo! UI Library > attribute > State.js (source view)
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    /**
     * The State class maintains state for a collection of named items, with 
     * a varying number of properties defined.
     *
     * It avoids the need to create a separate class for the item, and separate instances 
     * of these classes for each item, by storing the state in a 2 level hash table, 
     * improving performance when the number of items is likely to be large.
     *
     * @constructor
     * @class State
     */
    Y.State = function() { 
        /**
         * Hash of attributes
         * @property data
         */
        this.data = {};
    };

    Y.State.prototype = {

        /**
         * Adds a property to an item.
         *
         * @method add
         * @param name {String} The name of the item.
         * @param key {String} The name of the property.
         * @param val {Any} The value of the property.
         */
        add : function(name, key, val) {
            var d = this.data;
            d[key] = d[key] || {};
            d[key][name] = val;
        },

        /**
         * Adds multiple properties to an item.
         *
         * @method addAll
         * @param name {String} The name of the item.
         * @param o {Object} A hash of property/value pairs.
         */
        addAll: function(name, o) {
            var key;
            for (key in o) {
                if (o.hasOwnProperty(key)) {
                    this.add(name, key, o[key]);
                }
            }
        },

        /**
         * Removes a property from an item.
         *
         * @method remove
         * @param name {String} The name of the item.
         * @param key {String} The property to remove.
         */
        remove: function(name, key) {
            var d = this.data;
            if (d[key] && (name in d[key])) {
                delete d[key][name];
            }
        },

        /**
         * Removes multiple properties from an item, or remove the item completely.
         *
         * @method removeAll
         * @param name {String} The name of the item.
         * @param o {Object|Array} Collection of properties to delete. If not provided, the entire item is removed.
         */
        removeAll: function(name, o) {
            var d = this.data;

            Y.each(o || d, function(v, k) {
                if(Y.Lang.isString(k)) {
                    this.remove(name, k);
                } else {
                    this.remove(name, v);
                }
            }, this);
        },

        /**
         * For a given item, returns the value of the property requested, or undefined if not found.
         *
         * @method get
         * @param name {String} The name of the item
         * @param key {String} Optional. The property value to retrieve.
         * @return {Any} The value of the supplied property.
         */
        get: function(name, key) {
            var d = this.data;
            return (d[key] && name in d[key]) ?  d[key][name] : undefined;
        },

        /**
         * For the given item, returns a disposable object with all of the
         * item's property/value pairs.
         *
         * @method getAll
         * @param name {String} The name of the item
         * @return {Object} An object with property/value pairs for the item.
         */
        getAll : function(name) {
            var d = this.data, o;

            Y.each(d, function(v, k) {
                if (name in d[k]) {
                    o = o || {};
                    o[k] = v[name];
                }
            }, this);

            return o;
        }
    };

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