jquery registry

gistfile1.js

(function(){

    var Cache = function() {
        var data = [];
    };
    Cache.prototype = {
        set: function(key, value) {
            this.data[key] = value;
        },
        get: function(key) {
            return this.has(key) ? this.data[key] : null;
        },
        has: function(key) {
            return key in this.data;
        },
        remove: function(key) {
            delete this.data[key];
        }
    };

    var cache = null;

    var loadFile = function(filePath, callback){
        var head = document.getElementsByTagName('head')[0];
        var script = document.createElement('script');
        script.type= 'text/javascript';
        script.onreadystatechange = function () {
            if (this.readyState == 'complete') {
                callback();
            }
        }
        script.onload = callback;
        script.src = filePath;
        head.appendChild(script);
    };

    this.get = function(version) {
        var cache = this.getCache();

        if (cache.has(version)) {
            jQuery = cache.get(version);

            // set noConflict and return jquery
            return jQuery.noConflict();
        }
    };

    this.register = function(version, filePath) {
        var cache = this.getCache();

        loadFile(filePath, function() {
            // write it into cache
            cache.set(version, jQuery);
        });
    }

    this.unregister = function(version) {
        return this.getCache().remove(version);
    }

    this.getCache = function() {
        if (cache === null) {
            cache = new Cache();
        }
        return cache;
    };


}).call(diy.core.namespace('jQueryRegistry'));

// IN APP
(function($){
    // ...
    // here are the apps source with $
    // .....
})(jQueryRegistry.get('1.4.2'));