73 lines
1.5 KiB
JavaScript
73 lines
1.5 KiB
JavaScript
/**
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* Copyright (c) 2006-2015, JGraph Ltd
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* Copyright (c) 2006-2015, Gaudenz Alder
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*/
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var mxObjectIdentity =
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{
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/**
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* Class: mxObjectIdentity
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*
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* Identity for JavaScript objects and functions. This is implemented using
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* a simple incrementing counter which is stored in each object under
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* <FIELD_NAME>.
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*
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* The identity for an object does not change during its lifecycle.
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*
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* Variable: FIELD_NAME
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*
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* Name of the field to be used to store the object ID. Default is
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* <code>mxObjectId</code>.
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*/
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FIELD_NAME: 'mxObjectId',
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/**
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* Variable: counter
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*
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* Current counter.
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*/
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counter: 0,
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/**
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* Function: get
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*
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* Returns the ID for the given object or function or null if no object
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* is specified.
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*/
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get: function(obj)
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{
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if (obj != null)
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{
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if (obj[mxObjectIdentity.FIELD_NAME] == null)
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{
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if (typeof obj === 'object')
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{
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var ctor = mxUtils.getFunctionName(obj.constructor);
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obj[mxObjectIdentity.FIELD_NAME] = ctor + '#' + mxObjectIdentity.counter++;
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}
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else if (typeof obj === 'function')
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{
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obj[mxObjectIdentity.FIELD_NAME] = 'Function#' + mxObjectIdentity.counter++;
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}
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}
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return obj[mxObjectIdentity.FIELD_NAME];
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}
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return null;
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},
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/**
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* Function: clear
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*
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* Deletes the ID from the given object or function.
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*/
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clear: function(obj)
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{
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if (typeof(obj) === 'object' || typeof obj === 'function')
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{
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delete obj[mxObjectIdentity.FIELD_NAME];
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}
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}
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};
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