/*

Copyright 2008-2013 Clipperz Srl

This file is part of Clipperz, the online password manager.
For further information about its features and functionalities please
refer to http://www.clipperz.com.

* Clipperz is free software: you can redistribute it and/or modify it
  under the terms of the GNU Affero General Public License as published
  by the Free Software Foundation, either version 3 of the License, or 
  (at your option) any later version.

* Clipperz is distributed in the hope that it will be useful, but 
  WITHOUT ANY WARRANTY; without even the implied warranty of 
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Affero General Public License for more details.

* You should have received a copy of the GNU Affero General Public
  License along with Clipperz. If not, see http://www.gnu.org/licenses/.

*/

if (typeof YAHOO == 'undefined') { YAHOO = {}; };
if (typeof YAHOO.util == 'undefined') { YAHOO.util = {}; };
if (typeof YAHOO.util.Dom == 'undefined') { YAHOO.util.Dom = {}; };

YAHOO.extend = function(subc, superc, overrides) {
	var F = function() {};
	F.prototype=superc.prototype;
	subc.prototype=new F();
	subc.prototype.constructor=subc;
	subc.superclass=superc.prototype;
	if (superc.prototype.constructor == Object.prototype.constructor) {
		superc.prototype.constructor=superc;
	}

	if (overrides) {
		for (var i in overrides) {
			subc.prototype[i]=overrides[i];
		}
	}
};

YAHOO.override = function(origclass, overrides){
	if(overrides){
		var p = origclass.prototype;
		for(var method in overrides){
			p[method] = overrides[method];
		}
	}
};

YAHOO.extendX = function(subclass, superclass, overrides){
	YAHOO.extend(subclass, superclass);
	subclass.override = function(o){
		YAHOO.override(subclass, o);
	};
	if(!subclass.prototype.override){
		subclass.prototype.override = function(o){
			for(var method in o){
				this[method] = o[method];
			}  
		};
	}
	if(overrides){
		subclass.override(overrides);
	};
	
};

YAHOO.util.Dom.get = function(el) {
	if (!el) { return null; } // nothing to work with
	
	if (typeof el != 'string' && !(el instanceof Array) ) { // assuming HTMLElement or HTMLCollection, so pass back as is
		return el;
	}
	
	if (typeof el == 'string') { // ID
		return document.getElementById(el);
	}
	else { // array of ID's and/or elements
		var collection = [];
	for (var i = 0, len = el.length; i < len; ++i) {
		collection[collection.length] = YAHOO.util.Dom.get(el[i]);
	}
	
		return collection;
	}
	
	return null; // safety, should never happen
};