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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2004-2007 1&1 Internet AG, Germany, http://www.1and1.org
License:
LGPL: http://www.gnu.org/licenses/lgpl.html
EPL: http://www.eclipse.org/org/documents/epl-v10.php
See the LICENSE file in the project's top-level directory for details.
Authors:
* Sebastian Werner (wpbasti)
* Andreas Ecker (ecker)
************************************************************************ */
/* ************************************************************************
#module(core)
************************************************************************ */
/**
* Collection of helper methods operatinf on functions.
*/
qx.OO.defineClass("qx.lang.Function");
/*
---------------------------------------------------------------------------
SIMPLE RETURN METHODS
---------------------------------------------------------------------------
*/
/**
* Simply return true.
*
* @return {Boolean} Always returns true.
*/
qx.lang.Function.returnTrue = function() {
return true;
};
/**
* Simply return false.
*
* @return {Boolean} Always returns false.
*/
qx.lang.Function.returnFalse = function() {
return false;
};
/**
* Simply return null.
*
* @return {var} Always returns null.
*/
qx.lang.Function.returnNull = function() {
return null;
};
/**
* Return "this".
*
* @return {Object} Always returns "this".
*/
qx.lang.Function.returnThis = function() {
return this;
};
/**
* Used to return a refernce to an singleton. Classes which should act as singletons can use this
* function to implement the "getInstance" methods.
*
* @returns {Object} Singleton instance of the class this method is bound to.
*/
qx.lang.Function.returnInstance = function()
{
if (!this._instance)
{
this._instance = new this;
/*
if (this._instance.debug) {
this._instance.debug("Created...");
}*/
}
return this._instance;
};
/**
* Simply return 0.
*
* @return {Number} Always returns 0.
*/
qx.lang.Function.returnZero = function() {
return 0;
};
/**
* Simply return a negative index (-1).
*
* @return {Number} Always returns -1.
*/
qx.lang.Function.returnNegativeIndex = function() {
return -1;
};
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