sax2dtm.java

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          {
            int dataIndex = _dataOrQName(identity);

            if (-1 == offset)
            {
              offset = m_data.elementAt(dataIndex);
            }

            length += m_data.elementAt(dataIndex + 1);
          }

          identity = getNextNodeIdentity(identity);
        } while (DTM.NULL != identity && (_parent(identity) >= startNode));

        if (length > 0)
        {
          return m_xstrf.newstr(m_chars, offset, length);
        }
      }
      else if(type != DTM.ELEMENT_NODE)
      {
        int dataIndex = _dataOrQName(identity);

        if (dataIndex < 0)
        {
          dataIndex = -dataIndex;
          dataIndex = m_data.elementAt(dataIndex + 1);
        }
        return m_xstrf.newstr(m_valuesOrPrefixes.indexToString(dataIndex));
      }
    }

    return m_xstrf.emptystr();
  }
  
  /**
   * Determine if the string-value of a node is whitespace
   *
   * @param nodeHandle The node Handle.
   *
   * @return Return true if the given node is whitespace.
   */
  public boolean isWhitespace(int nodeHandle)
  {
    int identity = makeNodeIdentity(nodeHandle);
    int type;
    if(identity==DTM.NULL) // Separate lines because I wanted to breakpoint it
      type = DTM.NULL;
    else
      type= _type(identity);

    if (isTextType(type))
    {
      int dataIndex = _dataOrQName(identity);
      int offset = m_data.elementAt(dataIndex);
      int length = m_data.elementAt(dataIndex + 1);

      return m_chars.isWhitespace(offset, length);
    }
    return false;
  }

  /**
   * Returns the <code>Element</code> whose <code>ID</code> is given by
   * <code>elementId</code>. If no such element exists, returns
   * <code>DTM.NULL</code>. Behavior is not defined if more than one element
   * has this <code>ID</code>. Attributes (including those
   * with the name "ID") are not of type ID unless so defined by DTD/Schema
   * information available to the DTM implementation.
   * Implementations that do not know whether attributes are of type ID or
   * not are expected to return <code>DTM.NULL</code>.
   *
   * <p>%REVIEW% Presumably IDs are still scoped to a single document,
   * and this operation searches only within a single document, right?
   * Wouldn't want collisions between DTMs in the same process.</p>
   *
   * @param elementId The unique <code>id</code> value for an element.
   * @return The handle of the matching element.
   */
  public int getElementById(String elementId)
  {

    Integer intObj;
    boolean isMore = true;

    do
    {
      intObj = (Integer) m_idAttributes.get(elementId);

      if (null != intObj)
        return makeNodeHandle(intObj.intValue());

      if (!isMore || m_endDocumentOccured)
        break;

      isMore = nextNode();
    }
    while (null == intObj);

    return DTM.NULL;
  }

  /**
   * Get a prefix either from the qname or from the uri mapping, or just make
   * one up!
   *
   * @param qname The qualified name, which may be null.
   * @param uri The namespace URI, which may be null.
   *
   * @return The prefix if there is one, or null.
   */
  public String getPrefix(String qname, String uri)
  {

    String prefix;
    int uriIndex = -1;

    if (null != uri && uri.length() > 0)
    {

      do
      {
        uriIndex = m_prefixMappings.indexOf(uri, ++uriIndex);
      } while ( (uriIndex & 0x01) == 0);

      if (uriIndex >= 0)
      {
        prefix = (String) m_prefixMappings.elementAt(uriIndex - 1);
      }
      else if (null != qname)
      {
        int indexOfNSSep = qname.indexOf(':');

        if (qname.equals("xmlns"))
          prefix = "";
        else if (qname.startsWith("xmlns:"))
          prefix = qname.substring(indexOfNSSep + 1);
        else
          prefix = (indexOfNSSep > 0)
                   ? qname.substring(0, indexOfNSSep) : null;
      }
      else
      {
        prefix = null;
      }
    }
    else if (null != qname)
    {
      int indexOfNSSep = qname.indexOf(':');

      if (indexOfNSSep > 0)
      {
        if (qname.startsWith("xmlns:"))
          prefix = qname.substring(indexOfNSSep + 1);
        else
          prefix = qname.substring(0, indexOfNSSep);	
      }
      else
      {
      	if (qname.equals("xmlns"))
      	  prefix = "";
      	else
      	  prefix = null;
      }
    }
    else
    {
      prefix = null;
    }

    return prefix;
  }
  
  /**
   * Get a prefix either from the uri mapping, or just make
   * one up!
   *
   * @param uri The namespace URI, which may be null.
   *
   * @return The prefix if there is one, or null.
   */
  public int getIdForNamespace(String uri)
  {

     return m_valuesOrPrefixes.stringToIndex(uri);
    
  }

    /**
   * Get a prefix either from the qname or from the uri mapping, or just make
   * one up!
   *
   * @return The prefix if there is one, or null.
   */
  public String getNamespaceURI(String prefix)
  {

    String uri = "";
    int prefixIndex = m_contextIndexes.peek() - 1 ;

    if(null == prefix)
      prefix = "";

      do
      {
        prefixIndex = m_prefixMappings.indexOf(prefix, ++prefixIndex);
      } while ( (prefixIndex >= 0) && (prefixIndex & 0x01) == 0x01);

      if (prefixIndex > -1)
      {
        uri = (String) m_prefixMappings.elementAt(prefixIndex + 1);
      }


    return uri;
  }

  /**
   * Set an ID string to node association in the ID table.
   *
   * @param id The ID string.
   * @param elem The associated element handle.
   */
  public void setIDAttribute(String id, int elem)
  {
    m_idAttributes.put(id, new Integer(elem));
  }

  /**
   * Check whether accumulated text should be stripped; if not,
   * append the appropriate flavor of text/cdata node.
   */
  protected void charactersFlush()
  {

    if (m_textPendingStart >= 0)  // -1 indicates no-text-in-progress
    {
      int length = m_chars.size() - m_textPendingStart;
      boolean doStrip = false;

      if (getShouldStripWhitespace())
      {
        doStrip = m_chars.isWhitespace(m_textPendingStart, length);
      }

      if (doStrip) {
        m_chars.setLength(m_textPendingStart);  // Discard accumulated text
      } else {
        // Guard against characters/ignorableWhitespace events that
        // contained no characters.  They should not result in a node.
        if (length > 0) {
          int exName = m_expandedNameTable.getExpandedTypeID(DTM.TEXT_NODE);
          int dataIndex = m_data.size();

          m_previous = addNode(m_coalescedTextType, exName,
                               m_parents.peek(), m_previous, dataIndex, false);

          m_data.addElement(m_textPendingStart);
          m_data.addElement(length);
        }
      }

      // Reset for next text block
      m_textPendingStart = -1;
      m_textType = m_coalescedTextType = DTM.TEXT_NODE;
    }
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of the EntityResolver interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * Resolve an external entity.
   *
   * <p>Always return null, so that the parser will use the system
   * identifier provided in the XML document.  This method implements
   * the SAX default behaviour: application writers can override it
   * in a subclass to do special translations such as catalog lookups
   * or URI redirection.</p>
   *
   * @param publicId The public identifer, or null if none is
   *                 available.
   * @param systemId The system identifier provided in the XML
   *                 document.
   * @return The new input source, or null to require the
   *         default behaviour.
   * @throws SAXException Any SAX exception, possibly
   *            wrapping another exception.
   * @see org.xml.sax.EntityResolver#resolveEntity
   *
   * @throws SAXException
   */
  public InputSource resolveEntity(String publicId, String systemId)
          throws SAXException
  {
    return null;
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of DTDHandler interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * Receive notification of a notation declaration.
   *
   * <p>By default, do nothing.  Application writers may override this
   * method in a subclass if they wish to keep track of the notations
   * declared in a document.</p>
   *
   * @param name The notation name.
   * @param publicId The notation public identifier, or null if not
   *                 available.
   * @param systemId The notation system identifier.
   * @throws SAXException Any SAX exception, possibly
   *            wrapping another exception.
   * @see org.xml.sax.DTDHandler#notationDecl
   *
   * @throws SAXException
   */
  public void notationDecl(String name, String publicId, String systemId)
          throws SAXException
  {

    // no op
  }

  /**
   * Receive notification of an unparsed entity declaration.
   *
   * <p>By default, do nothing.  Application writers may override this
   * method in a subclass to keep track of the unparsed entities
   * declared in a document.</p>
   *
   * @param name The entity name.
   * @param publicId The entity public identifier, or null if not
   *                 available.
   * @param systemId The entity system identifier.
   * @param notationName The name of the associated notation.
   * @throws SAXException Any SAX exception, possibly
   *            wrapping another exception.
   * @see org.xml.sax.DTDHandler#unparsedEntityDecl
   *
   * @throws SAXException
   */
  public void unparsedEntityDecl(
          String name, String publicId, String systemId, String notationName)
            throws SAXException
  {

    if (null == m_entities)
    {
      m_entities = new Vector();
    }

    try
    {
      systemId = SystemIDResolver.getAbsoluteURI(systemId,
                                                 getDocumentBaseURI());
    }
    catch (Exception e)
    {
      throw new org.xml.sax.SAXException(e);
    }

    //  private static final int ENTITY_FIELD_PUBLICID = 0;
    m_entities.addElement(publicId);

    //  private static final int ENTITY_FIELD_SYSTEMID = 1;
    m_entities.addElement(systemId);

    //  private static final int ENTITY_FIELD_NOTATIONNAME = 2;
    m_entities.addElement(notationName);

    //  private static final int ENTITY_FIELD_NAME = 3;
    m_entities.addElement(name);
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of ContentHandler interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * Receive a Locator object for document events.
   *
   * <p>By default, do nothing.  Application writers may override this
   * method in a subclass if they wish to store the locator for use
   * with other document events.</p>
   *
   * @param locator A locator for all SAX document events.
   * @see org.xml.sax.ContentHandler#setDocumentLocator
   * @see org.xml.sax.Locator
   */
  public void setDocumentLocator(Locator locator)
  {
    m_locator = locator;
    m_systemId = locator.getSystemId();
  }

  /**
   * Receive notification of the beginning of the document.
   *
   * @throws SAXException Any SAX exception, possibly
   *            wrapping another exception.
   * @see org.xml.sax.ContentHandler#startDocument
   */
  public void startDocument() throws SAXException
  {
    if (DEBUG)
      System.out.println("startDocument");

		
    int doc = addNode(DTM.DOCUMENT_NODE,
                      m_expandedNameTable.getExpandedTypeID(DTM.DOCUMENT_NODE),
                      DTM.NULL, DTM.NULL, 0, true);

    m_parents.push(doc);
    m_previous = DTM.NULL;

    m_contextIndexes.push(m_prefixMappings.size());  // for the next element.
  }

  /**
   * Receive notification of the end of the document.
   *
   * @throws SAXException Any SAX exception, possibly