Examples of DTM

com.sun.org.apache.xml.internal.dtm.DTM
DTM is an XML document model expressed as a table rather than an object tree. It attempts to provide an interface to a parse tree that has very little object creation. (DTM implementations may also support incremental construction of the model, but that's hidden from the DTM API.)
Nodes in the DTM are identified by integer "handles". A handle must be unique within a process, and carries both node identification and document identification. It must be possible to compare two handles (and thus their nodes) for identity with "==".

Namespace URLs, local-names, and expanded-names can all be represented by and tested as integer ID values. An expanded name represents (and may or may not directly contain) a combination of the URL ID, and the local-name ID. Note that the namespace URL id can be 0, which should have the meaning that the namespace is null. For consistancy, zero should not be used for a local-name index.

Text content of a node is represented by an index and length, permitting efficient storage such as a shared FastStringBuffer.

The model of the tree, as well as the general navigation model, is that of XPath 1.0, for the moment. The model will eventually be adapted to match the XPath 2.0 data model, XML Schema, and InfoSet.

DTM does _not_ directly support the W3C's Document Object Model. However, it attempts to come close enough that an implementation of DTM can be created that wraps a DOM and vice versa.

Please Note: The DTM API is still Subject To Change. This wouldn't affect most users, but might require updating some extensions.

The largest change being contemplated is a reconsideration of the Node Handle representation. We are still not entirely sure that an integer packed with two numeric subfields is really the best solution. It has been suggested that we move up to a Long, to permit more nodes per document without having to reduce the number of slots in the DTMManager. There's even been a proposal that we replace these integers with "cursor" objects containing the internal node id and a pointer to the actual DTM object; this might reduce the need to continuously consult the DTMManager to retrieve the latter, and might provide a useful "hook" back into normal Java heap management. But changing this datatype would have huge impact on Xalan's internals -- especially given Java's lack of C-style typedefs -- so we won't cut over unless we're convinced the new solution really would be an improvement!
org.apache.xml.dtm.DTM
DTM is an XML document model expressed as a table rather than an object tree. It attempts to provide an interface to a parse tree that has very little object creation. (DTM implementations may also support incremental construction of the model, but that's hidden from the DTM API.)
Nodes in the DTM are identified by integer "handles". A handle must be unique within a process, and carries both node identification and document identification. It must be possible to compare two handles (and thus their nodes) for identity with "==".

Namespace URLs, local-names, and expanded-names can all be represented by and tested as integer ID values. An expanded name represents (and may or may not directly contain) a combination of the URL ID, and the local-name ID. Note that the namespace URL id can be 0, which should have the meaning that the namespace is null. For consistancy, zero should not be used for a local-name index.

Text content of a node is represented by an index and length, permitting efficient storage such as a shared FastStringBuffer.

The model of the tree, as well as the general navigation model, is that of XPath 1.0, for the moment. The model will eventually be adapted to match the XPath 2.0 data model, XML Schema, and InfoSet.

DTM does _not_ directly support the W3C's Document Object Model. However, it attempts to come close enough that an implementation of DTM can be created that wraps a DOM and vice versa.

Please Note: The DTM API is still Subject To Change. This wouldn't affect most users, but might require updating some extensions.

The largest change being contemplated is a reconsideration of the Node Handle representation. We are still not entirely sure that an integer packed with two numeric subfields is really the best solution. It has been suggested that we move up to a Long, to permit more nodes per document without having to reduce the number of slots in the DTMManager. There's even been a proposal that we replace these integers with "cursor" objects containing the internal node id and a pointer to the actual DTM object; this might reduce the need to continuously consult the DTMManager to retrieve the latter, and might provide a useful "hook" back into normal Java heap management. But changing this datatype would have huge impact on Xalan's internals -- especially given Java's lack of C-style typedefs -- so we won't cut over unless we're convinced the new solution really would be an improvement!

Examples of com.sun.org.apache.xml.internal.dtm.DTM

  {


    String lang = m_arg0.execute(xctxt).str();
    int parent = xctxt.getCurrentNode();
    boolean isLang = false;
    DTM dtm = xctxt.getDTM(parent);


    while (DTM.NULL != parent)
    {
      if (DTM.ELEMENT_NODE == dtm.getNodeType(parent))
      {
        int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang");


        if (DTM.NULL != langAttr)
        {
          String langVal = dtm.getNodeValue(langAttr);
          // %OPT%
          if (langVal.toLowerCase().startsWith(lang.toLowerCase()))
          {
            int valLen = lang.length();


            if ((langVal.length() == valLen)
                    || (langVal.charAt(valLen) == '-'))
            {
              isLang = true;
            }
          }


          break;
        }
      }


      parent = dtm.getParent(parent);
    }


    return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
  }

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

    if(getPredicateCount() > 0)
      return super.asNode(xctxt);


    int current = xctxt.getCurrentNode();
    
    DTM dtm = xctxt.getDTM(current);
    DTMAxisTraverser traverser = dtm.getAxisTraverser(m_axis);
    
    String localName = getLocalName();
    String namespace = getNamespace();
    int what = m_whatToShow;
    
    // System.out.print(" (DescendantIterator) ");
    
    // System.out.println("what: ");
    // NodeTest.debugWhatToShow(what);
    if(DTMFilter.SHOW_ALL == what
       || localName == NodeTest.WILD
       || namespace == NodeTest.WILD)
    {
      return traverser.first(current);
    }
    else
    {
      int type = getNodeTypeTest(what);
      int extendedType = dtm.getExpandedTypeID(namespace, localName, type);
      return traverser.first(current, extendedType);
    }
  }

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Examples of com.sun.org.apache.xml.internal.dtm.DTM


    int current = xctxt.getCurrentNode();
    clone.setRoot(current, xctxt);
    
    int node = clone.nextNode();
    DTM dtm = clone.getDTM(node);
    clone.detach();
  
    if(node != DTM.NULL)
    {
      dtm.dispatchCharactersEvents(node, handler, false);
    }
  }

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

   */
  public XObject execute(XPathContext xctxt, int context)
          throws javax.xml.transform.TransformerException
  {


    DTM dtm = xctxt.getDTM(context);
    short nodeType = dtm.getNodeType(context);


    if (m_whatToShow == DTMFilter.SHOW_ALL)
      return m_score;


    int nodeBit = (m_whatToShow & (0x00000001 << (nodeType - 1)));


    switch (nodeBit)
    {
    case DTMFilter.SHOW_DOCUMENT_FRAGMENT :
    case DTMFilter.SHOW_DOCUMENT :
      return SCORE_OTHER;
    case DTMFilter.SHOW_COMMENT :
      return m_score;
    case DTMFilter.SHOW_CDATA_SECTION :
    case DTMFilter.SHOW_TEXT :


      // was: 
      // return (!xctxt.getDOMHelper().shouldStripSourceNode(context))
      //       ? m_score : SCORE_NONE;
      return m_score;
    case DTMFilter.SHOW_PROCESSING_INSTRUCTION :
      return subPartMatch(dtm.getNodeName(context), m_name)
             ? m_score : SCORE_NONE;


    // From the draft: "Two expanded names are equal if they 
    // have the same local part, and either both have no URI or 
    // both have the same URI."
    // "A node test * is true for any node of the principal node type. 
    // For example, child::* will select all element children of the 
    // context node, and attribute::* will select all attributes of 
    // the context node."
    // "A node test can have the form NCName:*. In this case, the prefix 
    // is expanded in the same way as with a QName using the context 
    // namespace declarations. The node test will be true for any node 
    // of the principal type whose expanded name has the URI to which 
    // the prefix expands, regardless of the local part of the name."
    case DTMFilter.SHOW_NAMESPACE :
    {
      String ns = dtm.getLocalName(context);


      return (subPartMatch(ns, m_name)) ? m_score : SCORE_NONE;
    }
    case DTMFilter.SHOW_ATTRIBUTE :
    case DTMFilter.SHOW_ELEMENT :
    {
      return (m_isTotallyWild || (subPartMatchNS(dtm.getNamespaceURI(context), m_namespace) && subPartMatch(dtm.getLocalName(context), m_name)))
             ? m_score : SCORE_NONE;
    }
    default :
      return SCORE_NONE;
    }  // end switch(testType)

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

   initDTM(root, xctxt); 
  }
  
  private final void initDTM(int root, XPathContext xctxt){
    m_dtmRoot = root;
    final DTM dtm = xctxt.getDTM(root);
    if(dtm != null){
      m_DTMXRTreeFrag = xctxt.getDTMXRTreeFrag(xctxt.getDTMIdentity(dtm));
    }
  }

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

      break;
    case DTM.DOCUMENT_NODE :
      this.m_contentHandler.startDocument();
      break;
    case DTM.ELEMENT_NODE :
      DTM dtm = m_dtm;           


      for (int nsn = dtm.getFirstNamespaceNode(node, true); DTM.NULL != nsn;
           nsn = dtm.getNextNamespaceNode(node, nsn, true))
      {
        // String prefix = dtm.getPrefix(nsn);
        String prefix = dtm.getNodeNameX(nsn);


        this.m_contentHandler.startPrefixMapping(prefix, dtm.getNodeValue(nsn));
        
      }


      // System.out.println("m_dh.getNamespaceOfNode(node): "+m_dh.getNamespaceOfNode(node));
      // System.out.println("m_dh.getLocalNameOfNode(node): "+m_dh.getLocalNameOfNode(node));
      String ns = dtm.getNamespaceURI(node);
      if(null == ns)
        ns = "";
        
      // %OPT% !!
      org.xml.sax.helpers.AttributesImpl attrs = 
                            new org.xml.sax.helpers.AttributesImpl();
              
      for (int i = dtm.getFirstAttribute(node); 
           i != DTM.NULL; 
           i = dtm.getNextAttribute(i)) 
      {
        attrs.addAttribute(dtm.getNamespaceURI(i), 
                           dtm.getLocalName(i), 
                           dtm.getNodeName(i), 
                           "CDATA", 
                           dtm.getNodeValue(i));
      }
      
        
      this.m_contentHandler.startElement(ns,
                                         m_dtm.getLocalName(node),

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

   */
  public XObject execute(XPathContext xctxt, int currentNode)
          throws javax.xml.transform.TransformerException
  {


    DTM dtm = xctxt.getDTM(currentNode);


    if (dtm != null)
    {
      int expType = dtm.getExpandedTypeID(currentNode);


      return execute(xctxt, currentNode, dtm, expType);
    }


    return NodeTest.SCORE_NONE;

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

                    boolean findLast)
  {


    int pos = 0;
    int context = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(context);
    int parent = dtm.getParent(context);


    try
    {
      DTMAxisTraverser traverser = dtm.getAxisTraverser(Axis.CHILD);


      for (int child = traverser.first(parent); DTM.NULL != child;
              child = traverser.next(parent, child))
      {
        try

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

    double sum = 0.0;
    int pos;


    while (DTM.NULL != (pos = nodes.nextNode()))
    {
      DTM dtm = nodes.getDTM(pos);
      XMLString s = dtm.getStringValue(pos);


      if (null != s)
        sum += s.toDouble();
    }
    nodes.detach();

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Examples of com.sun.org.apache.xml.internal.dtm.DTM

     */
    public double toNumber(org.w3c.dom.Node n)
    {
      // %REVIEW% You can't get much uglier than this...
      int nodeHandle = getDTMHandleFromNode(n);
      DTM dtm = getDTM(nodeHandle);
      XString xobj = (XString)dtm.getStringValue(nodeHandle);
      return xobj.num();
    }

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