/// <summary>
/// Imports the first graph not being of type "gxl-1.0" from the given text reader input stream.
/// Any errors will be reported by exception.
/// </summary>
/// <param name="inStream">The text reader input stream import source.</param>
/// <param name="backend">The backend to use to create the graph.</param>
/// <param name="graphModel">The graph model to be used,
/// it must be conformant to the model used in the file to be imported.</param>
/// <param name="actions">Receives the actions object in case a .grg model is given.</param>
public static IGraph Import(TextReader inStream, IBackend backend, IGraphModel graphModel, out IActions actions)
{
XmlDocument doc = new XmlDocument();
doc.Load(inStream);
XmlElement gxlelem = doc["gxl"];
if (gxlelem == null)
{
throw new Exception("The document has no gxl element.");
}
XmlElement graphelem = null;
String graphtype = null;
foreach (XmlElement curgraphnode in gxlelem.GetElementsByTagName("graph"))
{
graphtype = GetTypeName(curgraphnode);
if (!graphtype.EndsWith("gxl-1.0.gxl#gxl-1.0"))
{
if (graphelem != null)
{
throw new Exception("More than one instance graph included (not yet supported)!");
}
graphelem = curgraphnode;
}
}
if (graphelem == null)
{
throw new Exception("No non-meta graph found!");
}
String graphname = graphelem.GetAttribute("id");
IGraph graph = backend.CreateGraph(graphModel, graphname);
ImportGraph(graph, doc, graphelem);
actions = null;
return(graph);
}
/// <summary>
/// Imports the first graph not being of type "gxl-1.0" from the given text reader input stream.
/// Any errors will be reported by exception.
/// </summary>
/// <param name="inStream">The text reader input stream import source.</param>
/// <param name="modelOverride">If not null, overrides the filename of the graph model to be used.</param>
/// <param name="backend">The backend to use to create the graph.</param>
/// <param name="actions">Receives the actions object in case a .grg model is given.</param>
public static IGraph Import(TextReader inStream, String modelOverride, IBackend backend, out IActions actions)
{
XmlDocument doc = new XmlDocument();
doc.XmlResolver = null;
doc.Load(inStream);
XmlElement gxlelem = doc["gxl"];
if (gxlelem == null)
{
throw new Exception("The document has no gxl element.");
}
XmlElement graphelem = null;
String graphtype = null;
foreach (XmlElement curgraphnode in gxlelem.GetElementsByTagName("graph"))
{
graphtype = GetTypeName(curgraphnode);
if (!graphtype.EndsWith("gxl-1.0.gxl#gxl-1.0"))
{
if (graphelem != null)
{
throw new Exception("More than one instance graph included (not yet supported)!");
}
graphelem = curgraphnode;
}
}
if (graphelem == null)
{
throw new Exception("No non-meta graph found!");
}
String modelfilename;
if (modelOverride == null)
{
XmlDocument modeldoc;
int hashindex = graphtype.IndexOf('#');
if (hashindex <= 0)
{
modeldoc = doc;
}
else
{
XmlReaderSettings settings = new XmlReaderSettings();
settings.ProhibitDtd = false;
XmlReader reader = XmlReader.Create(graphtype.Substring(0, hashindex), settings);
modeldoc = new XmlDocument();
modeldoc.Load(reader);
}
String localname = graphtype.Substring(hashindex + 1);
XmlElement modelnode = (XmlElement)modeldoc.SelectSingleNode(
"descendant::graph/node[@id='" + localname + "']");
if (modelnode == null)
{
throw new Exception("Graph schema \"" + graphtype + "\" not found.");
}
if (!GetTypeName(modelnode).EndsWith("gxl-1.0.gxl#GraphClass"))
{
throw new Exception("Graph type \"" + graphtype + "\" must refer to a GraphClass node.");
}
String modelname = GetGXLAttr(modelnode, "name", "string");
if (modelname.EndsWith("__gxl"))
{
modelname = modelname.Substring(0, modelname.Length - 5);
}
XmlElement modelgraph = (XmlElement)modelnode.ParentNode;
modelfilename = ImportModel(modelgraph, modelname);
}
else
{
modelfilename = modelOverride;
}
IGraph graph;
String graphname = graphelem.GetAttribute("id");
if (modelfilename.EndsWith(".grg"))
{
backend.CreateFromSpec(modelfilename, graphname, null,
ProcessSpecFlags.UseNoExistingFiles, new List <String>(),
out graph, out actions);
}
else
{
graph = backend.CreateGraph(modelfilename, graphname);
actions = null;
}
ImportGraph(graph, doc, graphelem);
return(graph);
}
