import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import com.sun.xml.tree.*;

public class TocBean {

  DocumentBuilderFactory factory;
  Document document;
  StringBuffer output = new StringBuffer(2048);
  int objectId = 1;

  public String getString() {
    return output.toString();
  }

  public void getToc(String tocFilename) {
    factory = DocumentBuilderFactory.newInstance();
    try {
      DocumentBuilder builder = factory.newDocumentBuilder();
      document = builder.parse( new File(tocFilename) );
      Node rootNode = document.getFirstChild();
      NamedNodeMap nnm = rootNode.getAttributes();
      if (nnm!= null) {
        Node title = nnm.getNamedItem("title" );
        Node url = nnm.getNamedItem("url");
        // output the first element of the following form
        // var e1 = createObject(1, "book title", "book url.html");
        output.append("var e1 = createObject(1, \"" +
          title.getNodeValue() + "\",  \"" +
          url.getNodeValue() + "\");\n");
      }
      getChildNode(rootNode, output);
    }
    catch (Exception e) {
      e.toString();
    }
  }

  void getChildNode(Node parentNode, StringBuffer s) {
    try {
      int currentObjectId = objectId;
      Node childNode = parentNode.getFirstChild();
      // get chapters' & headings' titles and URLs
      while (childNode != null) {
        String nodeName = childNode.getNodeName();
        if (nodeName!= null && (nodeName.equals("chapter") ||
          nodeName.startsWith("heading")) ) {

          objectId++;
          NamedNodeMap nnm = childNode.getAttributes();
          if (nnm!= null) {
            Node title = nnm.getNamedItem("title" );
            Node url = nnm.getNamedItem("url");
            s.append("var e" + objectId + " = 
              createObject(" + objectId + ", " +
              (title==null? "null" : "\"" + title.getNodeValue() + 
              "\"") + ", " +
              (url==null? "null" : "\"" + url.getNodeValue() + 
              "\"") + ");\n");
            s.append("append(e" + currentObjectId + " , " + 
              "e" + objectId + ");\n");
          }
          if (childNode.hasChildNodes())
            getChildNode(childNode, s);
        }
        childNode = childNode.getNextSibling();
      } // end while
    }
    catch (Exception e) {
      System.out.println("Error:" + e.toString() );
    }
  }


} // end class