/*	Copyright (c) 2004-2006, The Dojo Foundation	All Rights Reserved.	Licensed under the Academic Free License version 2.1 or above OR the	modified BSD license. For more information on Dojo licensing, see:		http://dojotoolkit.org/community/licensing.shtml*/dojo.provide("dojo.data.Observable");dojo.require("dojo.lang.common");dojo.require("dojo.lang.assert");// -------------------------------------------------------------------// Constructor// -------------------------------------------------------------------dojo.data.Observable = function() {};// -------------------------------------------------------------------// Public instance methods// -------------------------------------------------------------------dojo.data.Observable.prototype.addObserver = function(/* object */ observer) {	/**	 * summary: Registers an object as an observer of this item,	 * so that the object will be notified when the item changes.	 */ 	dojo.lang.assertType(observer, Object);	dojo.lang.assertType(observer.observedObjectHasChanged, Function);	if (!this._arrayOfObservers) {		this._arrayOfObservers = [];	}	if (!dojo.lang.inArray(this._arrayOfObservers, observer)) {		this._arrayOfObservers.push(observer);	}};dojo.data.Observable.prototype.removeObserver = function(/* object */ observer) {	/**	 * summary: Removes the observer registration for a previously	 * registered object.	 */ 	if (!this._arrayOfObservers) {		return;	}	var index = dojo.lang.indexOf(this._arrayOfObservers, observer);	if (index != -1) {		this._arrayOfObservers.splice(index, 1);	}};dojo.data.Observable.prototype.getObservers = function() {	/**	 * summary: Returns an array with all the observers of this item.	 */ 	return this._arrayOfObservers; // Array or undefined};