Пример #1
0
 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());
     }
   }
 }
Пример #2
0
  private void load_snap_from_xml(Element snap, StructureCollection structs, LinkedList tempList)
      throws VisualizerLoadException {
    Iterator iterator = snap.getChildren().iterator();

    if (!iterator.hasNext()) throw new VisualizerLoadException("Ran out of elements");

    structs.loadTitle((Element) (iterator.next()), tempList, this);
    structs.calcDimsAndStartPts(tempList, this);

    if (!iterator.hasNext()) return;
    Element child = (Element) iterator.next();

    if (child.getName().compareTo("doc_url") == 0) {
      // load the doc_url
      add_a_documentation_URL(child.getText().trim());
      if (!iterator.hasNext()) return;
      child = (Element) iterator.next();
    }

    if (child.getName().compareTo("pseudocode_url") == 0) {
      // load the psuedocode_url
      add_a_pseudocode_URL(child.getText().trim());
      if (!iterator.hasNext()) return;
      child = (Element) iterator.next();
    }

    if (child.getName().compareTo("audio_text") == 0) {
      // load the psuedocode_url
      add_audio_text(child.getText().trim());
      if (!iterator.hasNext()) return;
      child = (Element) iterator.next();
    }

    // create & load the individual structures, hooking them into the StructureCollection.
    // linespernode : calculate it at end of loadStructure call
    while (child.getName().compareTo("question_ref") != 0) {
      StructureType child_struct = assignStructureType(child);
      child_struct.loadStructure(child, tempList, this);
      structs.addChild(child_struct);

      if (!iterator.hasNext()) return;
      child = (Element) iterator.next();
    }

    if (child.getName().compareTo("question_ref") == 0) {
      // set up question ref
      add_a_question_xml(child.getAttributeValue("ref"));
    } else
      // should never happen
      throw new VisualizerLoadException(
          "Expected question_ref element, but found " + child.getName());

    if (iterator.hasNext()) {
      child = (Element) iterator.next();
      throw new VisualizerLoadException(
          "Found " + child.getName() + " when expecting end of snap.");
    }
  } // load_snap_from_xml