NullPointerException on exporting dynamic GEXF file with Toolkit

[Sébastien Heymann]

I tried to export a GEXF file to check things but it crashed, trying to write:

<attributes class="node" mode="dynamic">
   <attribute id="time_interval" title="Time Interval"

With the following exception:

java.lang.NullPointerException
at org.gephi.io.exporter.plugin.ExporterGEXF.writeAttributes(ExporterGEXF.java:324)
at org.gephi.io.exporter.plugin.ExporterGEXF.writeAttributes(ExporterGEXF.java:296)
at org.gephi.io.exporter.plugin.ExporterGEXF.writeGraph(ExporterGEXF.java:251)
at org.gephi.io.exporter.plugin.ExporterGEXF.execute(ExporterGEXF.java:213)
at org.gephi.io.exporter.impl.ExportControllerImpl.exportFile(ExportControllerImpl.java:110)
at org.gephi.io.exporter.impl.ExportControllerImpl.exportFile(ExportControllerImpl.java:67)

The problem is raised at at the line:
AttributeType staticType = TypeConvertor.getStaticType(col.getType());

When col.getType() return TimeInterval, which is not a type known by TypeConvertor.getStaticType().

But it seems the problem is inside ExporterGEXF.writeAttributes() with the predicate to add a dynamic column:

if (exportDynamic && col.getType().isDynamicType() && col.getOrigin().equals(AttributeOrigin.PROPERTY) && col.getIndex() == PropertiesColumn.EDGE_WEIGHT.getIndex()) {
    dynamicCols.add(col);
}

"col.getIndex() == PropertiesColumn.EDGE_WEIGHT.getIndex()" is suspicious, as it is true for the node attribute encoding the TimeInterval.

How to reproduce using the Toolkit:

//Init a project - and therefore a workspace
ProjectController pc = Lookup.getDefault().lookup(ProjectController.class);
pc.newProject();
Workspace workspace = pc.getCurrentWorkspace();

//Get controllers and models
ImportController importController = Lookup.getDefault().lookup(ImportController.class);

//Import file
Container container;
try {
    File file = new File("1.csv");
    container = importController.importFile(file);
    container.getLoader().setEdgeDefault(EdgeDefault.DIRECTED); //Force DIRECTED
    container.setAllowAutoNode(false); //Don't create missing nodes
} catch (Exception ex) {
    ex.printStackTrace();
    return;
}

//Initialize the DynamicProcessor - which will append the container to the workspace
DynamicProcessor dynamicProcessor = new DynamicProcessor();
dynamicProcessor.setDateMode(false); //Set 'true' if you set real dates (ex: yyyy-mm-dd), it's double otherwise
dynamicProcessor.setLabelmatching(false); //Set 'true' if node matching is done on labels instead of ids

//Set date for this file
dynamicProcessor.setDate("1");

//Process the container using the DynamicProcessor
importController.process(container, dynamicProcessor, workspace);

//Export full graph
ExportController ec = Lookup.getDefault().lookup(ExportController.class);
try {
    ec.exportFile(new File("io_gexf.gexf"));
} catch (IOException ex) {
    ex.printStackTrace();
    return;
}