// SpryNotifier.js - version 0.1 - Spry Pre-Release 1.6.1

//

// Copyright (c) 2007. Adobe Systems Incorporated.

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//

//   * Redistributions of source code must retain the above copyright notice,

//     this list of conditions and the following disclaimer.

//   * Redistributions in binary form must reproduce the above copyright notice,

//     this list of conditions and the following disclaimer in the documentation

//     and/or other materials provided with the distribution.

//   * Neither the name of Adobe Systems Incorporated nor the names of its

//     contributors may be used to endorse or promote products derived from this

//     software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

// POSSIBILITY OF SUCH DAMAGE.



var Spry; if (!Spry) Spry = {}; if (!Spry.Utils) Spry.Utils = {};



Spry.Utils.Notifier = function()

{

	this.observers = [];

	this.suppressNotifications = 0;

};



Spry.Utils.Notifier.prototype.addObserver = function(observer)

{

	if (!observer)

		return;



	// Make sure the observer isn't already on the list.



	var len = this.observers.length;

	for (var i = 0; i < len; i++)

	{

		if (this.observers[i] == observer)

			return;

	}

	this.observers[len] = observer;

};



Spry.Utils.Notifier.prototype.removeObserver = function(observer)

{

	if (!observer)

		return;



	for (var i = 0; i < this.observers.length; i++)

	{

		if (this.observers[i] == observer)

		{

			this.observers.splice(i, 1);

			break;

		}

	}

};



Spry.Utils.Notifier.prototype.notifyObservers = function(methodName, data)

{

	if (!methodName)

		return;



	if (!this.suppressNotifications)

	{

		var len = this.observers.length;

		for (var i = 0; i < len; i++)

		{

			var obs = this.observers[i];

			if (obs)

			{

				if (typeof obs == "function")

					obs(methodName, this, data);

				else if (obs[methodName])

					obs[methodName](this, data);

			}

		}

	}

};



Spry.Utils.Notifier.prototype.enableNotifications = function()

{

	if (--this.suppressNotifications < 0)

	{

		this.suppressNotifications = 0;

		Spry.Debug.reportError("Unbalanced enableNotifications() call!\n");

	}

};



Spry.Utils.Notifier.prototype.disableNotifications = function()

{

	++this.suppressNotifications;

};