YUI().add("Core.PlaceholderDataCenter", function (Y) {
    function PlaceholderDataCenter(data){
        initializeMembers.call(this, data);
    }

    var initializeMembers = function(data) {
        var me = this,
            widgets = [],
            listeners = [];
        
        this.setWidget = function (elementId, widget) {
            var widgetData = {
                elementId: elementId,
                widget: widget
            };
            
            widgets.push(widgetData);
            
            for (var i = 0 ; i < listeners.length; ++i) {
                listeners[i].fn.call(listeners[i].scope, widgetData);
            }
        };
        
        this.getWidgetById = function (elementId) {
            for (var i = 0; i < widgets.length; ++i) {
                if (widgets[i].elementId == elementId) {
                    return widgets[i].widget;
                }
            }
            
            return null;
        };
        
        this.getDataById = function (id) {
            for (var i = 0; i < data.length; ++i) {
                if (data[i].id == id) {
                    return data[i].data;
                }
            }
            
            return null;
        };
        
        this.onWidgetAdded = function (fn, scope) {
            listeners.push({ fn: fn, scope: scope });
        };
    };
    
    Y.Core = Y.Core || {};
    Y.Core.PlaceholderDataCenter = PlaceholderDataCenter;
});