private StructureType assignStructureType(Element structure) throws VisualizerLoadException {
String name = structure.getName().toLowerCase();
if (name.compareTo("graph") == 0) {
if (structure.getAttributeValue("weighted").compareTo("true") == 0)
return new Graph_Network("NETWORK");
else return new Graph_Network("GRAPH");
} else if (name.equals("array")) return new MD_Array();
else if (name.equals("no3darray")) return new No3darray();
else if (name.equals("linkedlist")) return new VisLinkedList();
else if (name.equals("no3dlinkedlist")) return new No3dLinkedList();
else if (name.equals("linkedlistnonull")) return new VisLinkedListNoNull();
else if (name.equals("bargraph")) return new BarScat("BAR");
else if (name.equals("scattergraph"))
return new BarScat(
"SCAT"); // not implemented in xml dtd, and does not have a load-from-xml method defined
else if (name.equals("stack")) return new Stack();
else if (name.equals("queue")) return new Queue();
else if (name.equals("tree")) {
if (structure.getChild("binary_node") != null) return new BinaryTree();
else return new GeneralTree();
} else if (name.equals("text")) return new TextStructure();
// if the XML element name is different from your structure's name, you can do something like
// this:
// else if( name.equalsIgnoreCase("node"))
// return new Node();
else if (name.equals("legend")) return new LegendofColors();
else {
// try dynamic typing
try {
return assignStructureType(name);
} catch (Exception e) {
throw new VisualizerLoadException(
"Unable to instantiate class \"" + name + "\":\n" + e.getMessage());
}
}
}
private /*synchronized*/ void readQuestions(StringTokenizer st) throws VisualizerLoadException {
String tmpStr =
"STARTQUESTIONS\n"; // When CG's QuestionFactory parses from a string, it looks for
// a line with STARTQUESTIONS -- hence we add it artificially here
try { // Build the string for the QuestionFactory
while (st.hasMoreTokens()) {
tmpStr += st.nextToken() + "\n";
}
} catch (Exception e) {
e.printStackTrace();
throw new VisualizerLoadException("Ooof! bad question format");
}
try {
// System.out.println(tmpStr);
// Problem -- must make this be line oriented
GaigsAV.questionCollection = QuestionFactory.parseScript(tmpStr);
} catch (QuestionParseException e) {
e.printStackTrace();
System.out.println("Error parsing questions.");
throw new VisualizerLoadException("Ooof! bad question format");
// throw new IOException();
}
} // readQuestions(st)