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/**
 * Copyright (c) 2006
 * Martin Czuchra, Nicolas Peters, Daniel Polak, Willi Tscheschner
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **/

/**
 * The super class for all classes in ORYX. Adds some OOP feeling to javascript.
 * See article "Object Oriented Super Class Method Calling with JavaScript" on
 * http://truecode.blogspot.com/2006/08/object-oriented-super-class-method.html
 * for a documentation on this. Fairly good article that points out errors in
 * Douglas Crockford's inheritance and super method calling approach.
 * Worth reading.
 * @class Clazz
 */
var Clazz = function() {};

/**
 * Empty constructor.
 * @methodOf Clazz.prototype
 */
Clazz.prototype.construct = function() {};

/**
 * Can be used to build up inheritances of classes.
 * @example
 * var MyClass = Clazz.extend({
 *   construct: function(myParam){
 *     // Do sth.
 *   }
 * });
 * var MySubClass = MyClass.extend({
 *   construct: function(myParam){
 *     // Use this to call constructor of super class
 *     arguments.callee.$.construct.apply(this, arguments);
 *     // Do sth.
 *   }
 * });
 * @param {Object} def The definition of the new class.
 */
Clazz.extend = function(def) {
    var classDef = function() {
        if (arguments[0] !== Clazz) { this.construct.apply(this, arguments); }
    };
    
    var proto = new this(Clazz);
    var superClass = this.prototype;
    
    for (var n in def) {
        var item = def[n];                        
        if (item instanceof Function) item.$ = superClass;
        proto[n] = item;
    }

    classDef.prototype = proto;
    
    //Give this new class the same static extend method    
    classDef.extend = this.extend;        
    return classDef;
};