// Sets up the color table for different road classes
static void setUpRoadClassColorTable(LineVisualizer lineVisualizer)
{
    // Create a keyed color attribute variable.
    // Set the default value to gray. 
    // This means all roads which are missing the RoadClass attribute
    // or not RoadClass 1, 2, 3 are visualized gray.
    KeyedColorAttributeVariable keyedColorAttributeVariable = 
        new KeyedColorAttributeVariable(
            new Atom("RoadClass"), new java.awt.Color(190, 190, 190));

    // Get the table from the keyed color attribute variable
    KeyedColorTable colorTable = keyedColorAttributeVariable.getTable();

    // Set the color red for RoadCalss 1 ( 1 = Highway)
    colorTable.put(1, new java.awt.Color(255, 0, 0));

    // Set the color yellow for RoadClass 2 (2 = Primaryroads)
    colorTable.put(2, new java.awt.Color(255, 255, 0));

    // Set the color white for RoadClass 3 (3 = Secondaryroads)
    colorTable.put(3, new java.awt.Color(255, 255, 255));

    // This property is a member of a type that might be referred to by a View 
    // or a GlobeView, either directly or indirectly through other objects, which means 
    // that you must use the Guard class to take the global configuration lock when it 
    // is modified to synchronize access with any running Carmenta Engine threads.
    Guard guard = new Guard();
    try
    {
        // Set the color table in the line visualizer
        lineVisualizer.setColor(keyedColorAttributeVariable);
    }
    finally
    {
        guard.dispose();
    }
}