sch_test/mxclient/js/util/mxObjectIdentity.js

73 lines
1.5 KiB
JavaScript

/**
* Copyright (c) 2006-2015, JGraph Ltd
* Copyright (c) 2006-2015, Gaudenz Alder
*/
var mxObjectIdentity =
{
/**
* Class: mxObjectIdentity
*
* Identity for JavaScript objects and functions. This is implemented using
* a simple incrementing counter which is stored in each object under
* <FIELD_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
* <code>mxObjectId</code>.
*/
FIELD_NAME: 'mxObjectId',
/**
* Variable: counter
*
* Current counter.
*/
counter: 0,
/**
* Function: get
*
* Returns the ID for the given object or function or null if no object
* is specified.
*/
get: function(obj)
{
if (obj != null)
{
if (obj[mxObjectIdentity.FIELD_NAME] == null)
{
if (typeof obj === 'object')
{
var ctor = mxUtils.getFunctionName(obj.constructor);
obj[mxObjectIdentity.FIELD_NAME] = ctor + '#' + mxObjectIdentity.counter++;
}
else if (typeof obj === 'function')
{
obj[mxObjectIdentity.FIELD_NAME] = 'Function#' + mxObjectIdentity.counter++;
}
}
return obj[mxObjectIdentity.FIELD_NAME];
}
return null;
},
/**
* Function: clear
*
* Deletes the ID from the given object or function.
*/
clear: function(obj)
{
if (typeof(obj) === 'object' || typeof obj === 'function')
{
delete obj[mxObjectIdentity.FIELD_NAME];
}
}
};