/// <summary>
/// Decodes the given XML node. The optional "into" argument specifies an
/// existing object to be used. If no object is given, then a new
/// instance is created using the constructor from the codec.
/// The function returns the passed in object or the new instance if no
/// object was given.
/// </summary>
/// <param name="node">XML node to be decoded.</param>
/// <param name="into">Optional object to be decodec into.</param>
/// <returns>Returns an object that represents the given node.</returns>
public Object Decode(XmlNode node, Object into)
{
Object obj = null;
if (node != null && node.NodeType == XmlNodeType.Element)
{
mxObjectCodec codec = mxCodecRegistry.GetCodec(node.Name);
try
{
if (codec != null)
{
obj = codec.Decode(this, node, into);
}
else
{
obj = node.CloneNode(true);
((XmlElement)obj).RemoveAttribute("as");
}
}
catch (Exception e)
{
Console.WriteLine("Cannot decode " + node.Name + ": "
+ e.Message);
}
}
return(obj);
}
/// <summary>
/// Decodes cells that have been encoded using inversion, ie. where the
/// user object is the enclosing node in the XML, and restores the group
/// and graph structure in the cells. Returns a new mxCell instance
/// that represents the given node.
/// </summary>
/// <param name="node">XML node that contains the cell data.</param>
/// <param name="restoreStructures">Boolean indicating whether the graph
/// structure should be restored by calling insert and insertEdge on the
/// parent and terminals, respectively.
/// </param>
/// <returns>Graph cell that represents the given node.</returns>
public mxICell DecodeCell(XmlNode node, bool restoreStructures)
{
mxICell cell = null;
if (node != null &&
node.NodeType == XmlNodeType.Element)
{
// Tries to find a codec for the given node name. If that does
// not return a codec then the node is the user object (an XML node
// that contains the mxCell, aka inversion).
mxObjectCodec decoder = mxCodecRegistry.GetCodec(node.Name);
// Tries to find the codec for the cell inside the user object.
// This assumes all node names inside the user object are either
// not registered or they correspond to a class for cells.
if (decoder == null)
{
XmlNode child = node.FirstChild;
while (child != null &&
!(decoder is mxCellCodec))
{
decoder = mxCodecRegistry.GetCodec(child.Name);
child = child.NextSibling;
}
}
if (!(decoder is mxCellCodec))
{
decoder = mxCodecRegistry.GetCodec("mxCell");
}
cell = (mxICell)decoder.Decode(this, node);
if (restoreStructures)
{
InsertIntoGraph(cell);
}
}
return(cell);
}
/// <summary>
/// Decodes an mxCell and uses the enclosing XML node as
/// the user object for the cell (inversion).
/// </summary>
public override XmlNode BeforeDecode(mxCodec dec, XmlNode node, Object obj)
{
XmlElement inner = (XmlElement)node;
if (obj is mxCell)
{
mxCell cell = (mxCell)obj;
String classname = GetName();
if (!node.Name.Equals(classname))
{
// Passes the inner graphical annotation node to the
// object codec for further processing of the cell.
XmlNode tmp = inner.GetElementsByTagName(classname)[0];
if (tmp != null && tmp.ParentNode == node)
{
inner = (XmlElement)tmp;
// Removes annotation and whitespace from node
XmlNode tmp2 = tmp.PreviousSibling;
while (tmp2 != null && tmp2.NodeType == XmlNodeType.Text)
{
XmlNode tmp3 = tmp2.PreviousSibling;
if (tmp2.Value.Trim().Length == 0)
{
tmp2.ParentNode.RemoveChild(tmp2);
}
tmp2 = tmp3;
}
// Removes more whitespace
tmp2 = tmp.NextSibling;
while (tmp2 != null && tmp2.NodeType == XmlNodeType.Text)
{
XmlNode tmp3 = tmp2.PreviousSibling;
if (tmp2.Value.Trim().Length == 0)
{
tmp2.ParentNode.RemoveChild(tmp2);
}
tmp2 = tmp3;
}
tmp.ParentNode.RemoveChild(tmp);
}
else
{
inner = null;
}
// Creates the user object out of the XML node
XmlElement value = (XmlElement)node.CloneNode(true);
cell.Value = value;
String id = value.GetAttribute("id");
if (id != null)
{
cell.Id = id;
value.RemoveAttribute("id");
}
}
else
{
cell.Id = ((XmlElement)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 && idrefs != null)
{
foreach (string attr in idrefs)
{
string rf = inner.GetAttribute(attr);
if (rf != null && rf.Length > 0)
{
inner.RemoveAttribute(attr);
Object tmp = (dec.Objects.ContainsKey(rf)) ? dec.Objects[rf] : null;
if (tmp == null)
{
tmp = dec.Lookup(rf);
}
if (tmp == null)
{
// Needs to decode forward reference
XmlNode element = dec.GetElementById(rf);
if (element != null)
{
mxObjectCodec decoder = mxCodecRegistry
.GetCodec(element.Name);
if (decoder == null)
{
decoder = this;
}
tmp = decoder.Decode(dec, element);
}
}
SetFieldValue(obj, attr, tmp);
}
}
}
}
return(inner);
}