Selection Path of a JTree

Question

I've loaded a JTree with nodes from an XML Schema file using the XSOM API (https://xsom.dev.java.net).

Every time a file is selected I do the folowing:

schemaParser = new XSDParser(selectedFile.getAbsolutePath());

TreeModel model = schemaParser.generateTreeModel();
schemaTree.setModel(model);
schemaTree.setCellRenderer(new SchemaTreeTraverser.SchemaTreeCellRenderer());

schemaTree is the variable name for the JTree.

The code for XSDParser is as follows:

package schemaparser;

import java.io.*;
import com.sun.xml.xsom.XSSchemaSet;
import com.sun.xml.xsom.impl.util.SchemaTreeTraverser;
import com.sun.xml.xsom.impl.util.SchemaWriter;
import com.sun.xml.xsom.parser.XSOMParser;

import javax.swing.tree.TreeModel;

public class XSDParser {

    private XSOMParser reader;
    private XSSchemaSet xss;

    public XSDParser(String parseFile){
        try {
            reader = new XSOMParser();
            reader.parse(new File(parseFile));

            xss = reader.getResult();
            if (xss == null) {
                System.out.println("error");
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

   public TreeModel generateTreeModel() {
        SchemaTreeTraverser stt = new SchemaTreeTraverser();
        stt.visit(xss);
        TreeModel model = stt.getModel();

        System.out.println("Returning the tree model");
        return model;
    }
}

Now whenever a node is selected in the JTree I do the following:

private void schemaTreeValueChanged(javax.swing.event.TreeSelectionEvent evt)      {                                        

        TreePath path = schemaTree.getSelectionPath();

        if(path != null)
            System.out.println(path.toString());

}

However now no matter which node I select in the tree I get something like: [null, null, null, null] (depending on how far the hierarchy I go)

For a simple JTree this would usually print out the path to the node, e.g.: [JTree, colors, red]

Anyone any idea how to fix this?

Thanks, Patrick

Answer 1

First answer is that the color data is provided by JTree when constructed with no arguments. Without further information it would appear that the TreeNodes constructed by schemaParser.generateTreeModel() are returning null for toString().