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/**
* $Id: mxObjectIdentity.js,v 1.8 2010-01-02 09:45:14 gaudenz Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
var mxObjectIdentity =
{
/**
* Class: mxObjectIdentity
*
* Identity for JavaScript objects. This is implemented using a simple
* incremeting counter which is stored in each object under <ID_NAME>.
*
* The identity for an object does not change during its lifecycle.
*
* Variable: FIELD_NAME
*
* Name of the field to be used to store the object ID. Default is
* '_mxObjectId'.
*/
FIELD_NAME: 'mxObjectId',
/**
* Variable: counter
*
* Current counter for objects.
*/
counter: 0,
/**
* Function: get
*
* Returns the object id for the given object.
*/
get: function(obj)
{
if (typeof(obj) == 'object' &&
obj[mxObjectIdentity.FIELD_NAME] == null)
{
var ctor = mxUtils.getFunctionName(obj.constructor);
obj[mxObjectIdentity.FIELD_NAME] = ctor+'#'+mxObjectIdentity.counter++;
}
return obj[mxObjectIdentity.FIELD_NAME];
},
/**
* Function: clear
*
* Removes the object id from the given object.
*/
clear: function(obj)
{
if (typeof(obj) == 'object')
{
delete obj[mxObjectIdentity.FIELD_NAME];
}
}
};
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