source: Dev/trunk/src/client/dojox/lang/oo/rearrange.js

dojo.provide("dojox.lang.oo.rearrange");

(function(){
        var extraNames = dojo._extraNames, extraLen = extraNames.length,
                opts = Object.prototype.toString, empty = {};

        dojox.lang.oo.rearrange = function(bag, map){
                // summary:
                //              Process properties in place by removing and renaming them.
                // description:
                //              Properties of an object are to be renamed or removed specified
                //              by "map" argument. Only own properties of "map" are processed.
                // example:
                //      |       oo.rearrange(bag, {
                //      |               abc: "def",     // rename "abc" attribute to "def"
                //      |               ghi: null       // remove/hide "ghi" attribute
                //      |       });
                // bag: Object
                //              the object to be processed
                // map: Object
                //              the dictionary for renaming (false value indicates removal of the named property)
                // returns: Object
                //              the original object

        var name, newName, prop, i, t;

                for(name in map){
                        newName = map[name];
                        if(!newName || opts.call(newName) == "[object String]"){
                                prop = bag[name];
                                if(!(name in empty) || empty[name] !== prop){
                                        if(!(delete bag[name])){
                                                // can't delete => hide it
                                                bag[name] = undefined;
                                        }
                                        if(newName){
                                                bag[newName] = prop;
                                        }
                                }
                        }
                }
                if(extraLen){
                        for(i = 0; i < extraLen; ++i){
                                name = extraNames[i];
                                // repeating the body above
                                newName = map[name];
                                if(!newName || opts.call(newName) == "[object String]"){
                                        prop = bag[name];
                                        if(!(name in empty) || empty[name] !== prop){
                                                if(!(delete bag[name])){
                                                        // can't delete => hide it
                                                        bag[name] = undefined;
                                                }
                                                if(newName){
                                                        bag[newName] = prop;
                                                }
                                        }
                                }
                        }
                }

                return bag;     // Object
        };
})();