SamplePlugin.js

YUI.add('sample-plugin', function(Y) {

    //strings to help compression
    var NODE = "node",
        SINGLE = "single",
        MULTIPLE = "multiple";

    Y.SamplePlugin = Y.Base.create("SamplePlugin", Y.Base, [], { // PROTOTYPE PROPERTIES
        //private values
        _type : null,
        
        //override base initializer method
        initializer : function(config) {
            if(!(config.node || config.nodes)) {
                return;
            }
            
            this.setAttrs(config);
            
            this._type = (config.node) ? SINGLE : MULTIPLE;
            
            return this;
        },
        
        //override base destructor method in case we need it
        destructor : function() {
            //no-op
        }
    }, { //STATIC PROPERTIES
        NS : VALUE,
        NAME : "SamplePlugin",
        ATTRS : {
            node : {
                value : null,
                setter : function(val, name) {
                    return (val instanceof Y.Node) ? val : Y.one(val);
                }
            },
            
            nodes : {
                value : null,
                setter : function(val, name) {
                    if(val) {
                        return (val instanceof Y.NodeList) ? val : Y.all(val);
                    }
                    
                    return false;
                }
            }
        }
    });
}, '@VERSION@' , { requires : [ 'base', 'value-change' ] });