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/**
* $Id: mxCellCodec.js,v 1.22 2010-10-21 07:12:31 gaudenz Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
mxCodecRegistry.register(function()
{
/**
* Class: mxCellCodec
*
* Codec for <mxCell>s. This class is created and registered
* dynamically at load time and used implicitely via <mxCodec>
* and the <mxCodecRegistry>.
*
* Transient Fields:
*
* - children
* - edges
* - overlays
* - mxTransient
*
* Reference Fields:
*
* - parent
* - source
* - target
*
* Transient fields can be added using the following code:
*
* mxCodecRegistry.getCodec(mxCell).exclude.push('name_of_field');
*/
var codec = new mxObjectCodec(new mxCell(),
['children', 'edges', 'overlays', 'mxTransient'],
['parent', 'source', 'target']);
/**
* Function: isCellCodec
*
* Returns true since this is a cell codec.
*/
codec.isCellCodec = function()
{
return true;
};
/**
* Function: isExcluded
*
* Excludes user objects that are XML nodes.
*/
codec.isExcluded = function(obj, attr, value, isWrite)
{
return mxObjectCodec.prototype.isExcluded.apply(this, arguments) ||
(isWrite && attr == 'value' &&
value.nodeType == mxConstants.NODETYPE_ELEMENT);
};
/**
* Function: afterEncode
*
* Encodes an <mxCell> and wraps the XML up inside the
* XML of the user object (inversion).
*/
codec.afterEncode = function(enc, obj, node)
{
if (obj.value != null &&
obj.value.nodeType == mxConstants.NODETYPE_ELEMENT)
{
// Wraps the graphical annotation up in the user object (inversion)
// by putting the result of the default encoding into a clone of the
// user object (node type 1) and returning this cloned user object.
var tmp = node;
node = (mxClient.IS_IE) ?
obj.value.cloneNode(true) :
enc.document.importNode(obj.value, true);
node.appendChild(tmp);
// Moves the id attribute to the outermost XML node, namely the
// node which denotes the object boundaries in the file.
var id = tmp.getAttribute('id');
node.setAttribute('id', id);
tmp.removeAttribute('id');
}
return node;
};
/**
* Function: beforeDecode
*
* Decodes an <mxCell> and uses the enclosing XML node as
* the user object for the cell (inversion).
*/
codec.beforeDecode = function(dec, node, obj)
{
var inner = node;
var classname = this.getName();
if (node.nodeName != classname)
{
// Passes the inner graphical annotation node to the
// object codec for further processing of the cell.
var tmp = node.getElementsByTagName(classname)[0];
if (tmp != null &&
tmp.parentNode == node)
{
mxUtils.removeWhitespace(tmp, true);
mxUtils.removeWhitespace(tmp, false);
tmp.parentNode.removeChild(tmp);
inner = tmp;
}
else
{
inner = null;
}
// Creates the user object out of the XML node
obj.value = node.cloneNode(true);
var id = obj.value.getAttribute('id');
if (id != null)
{
obj.setId(id);
obj.value.removeAttribute('id');
}
}
else
{
// Uses ID from XML file as ID for cell in model
obj.setId(node.getAttribute('id'));
}
// Preprocesses and removes all Id-references in order to use the
// correct encoder (this) for the known references to cells (all).
if (inner != null)
{
for (var i = 0; i < this.idrefs.length; i++)
{
var attr = this.idrefs[i];
var ref = inner.getAttribute(attr);
if (ref != null)
{
inner.removeAttribute(attr);
var object = dec.objects[ref] || dec.lookup(ref);
if (object == null)
{
// Needs to decode forward reference
var element = dec.getElementById(ref);
if (element != null)
{
var decoder = mxCodecRegistry.codecs[element.nodeName] || this;
object = decoder.decode(dec, element);
}
}
obj[attr] = object;
}
}
}
return inner;
};
// Returns the codec into the registry
return codec;
}());
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