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

     */
    public String toString(org.w3c.dom.Node n)
    {
      // %REVIEW% You can't get much uglier than this...
      int nodeHandle = getDTMHandleFromNode(n);
      DTM dtm = getDTM(nodeHandle);
      XMLString strVal = dtm.getStringValue(nodeHandle);
      return strVal.toString();
    }

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

      }


      int xpathOwnerNodeDTM = xctxt.getDTMHandleFromNode(xpathOwnerNode);


      int currentNode = xctxt.getCurrentNode();
      DTM dtm = xctxt.getDTM(currentNode);
      int docContext = dtm.getDocument();


      if (DTM.NULL == docContext) {
         error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
      }


      {


         // check whether currentNode and the node containing the XPath expression
         // are in the same document
         Document currentDoc =
            XMLUtils.getOwnerDocument(dtm.getNode(currentNode));
         Document xpathOwnerDoc = XMLUtils.getOwnerDocument(xpathOwnerNode);


         if (currentDoc != xpathOwnerDoc) {
            throw new TransformerException(I18n
               .translate("xpath.funcHere.documentsDiffer"));
         }
      }


      XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
      NodeSetDTM nodeSet = nodes.mutableNodeset();


      {
         int hereNode = DTM.NULL;


         switch (dtm.getNodeType(xpathOwnerNodeDTM)) {


         case Node.ATTRIBUTE_NODE : {
            // returns a node-set containing the attribute
            hereNode = xpathOwnerNodeDTM;


            nodeSet.addNode(hereNode);


            break;
         }
         case Node.PROCESSING_INSTRUCTION_NODE : {
            // returns a node-set containing the processing instruction node
            hereNode = xpathOwnerNodeDTM;


            nodeSet.addNode(hereNode);


            break;
         }
         case Node.TEXT_NODE : {
            // returns a node-set containing the parent element of the
            // text node that directly bears the XPath expression
            hereNode = dtm.getParent(xpathOwnerNodeDTM);


            nodeSet.addNode(hereNode);


            break;
         }

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

          i = -2;  // Duplicate, suppress insert


          break;
        }


        DTM dtm = support.getDTM(node);
        if (!dtm.isNodeAfter(node, child))
        {
          break;
        }
      }

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

            throws javax.xml.transform.TransformerException
  {


    XObject score = NodeTest.SCORE_NONE;
    int context = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(context);


    if (null != dtm)
    {
      int predContext = xctxt.getCurrentNode();
      DTMAxisTraverser traverser;
      
      int axis = m_axis;
      
      boolean needToTraverseAttrs = WalkerFactory.isDownwardAxisOfMany(axis);
      boolean iterRootIsAttr = (dtm.getNodeType(xctxt.getIteratorRoot()) 
                                 == DTM.ATTRIBUTE_NODE);


      if((Axis.PRECEDING == axis) && iterRootIsAttr)
      {
        axis = Axis.PRECEDINGANDANCESTOR;
      }
      
      traverser = dtm.getAxisTraverser(axis);


      for (int relative = traverser.first(context); DTM.NULL != relative;
              relative = traverser.next(context, relative))
      {
        try
        {
          xctxt.pushCurrentNode(relative);


          score = execute(xctxt);


          if (score != NodeTest.SCORE_NONE)
          {
        //score = executePredicates( xctxt, prevStep, SCORE_OTHER, 
        //       predContext, relative);
        if (executePredicates(xctxt, dtm, context))
      return score;
        
        score = NodeTest.SCORE_NONE;
          }
          
          if(needToTraverseAttrs && iterRootIsAttr
             && (DTM.ELEMENT_NODE == dtm.getNodeType(relative)))
          {
            int xaxis = Axis.ATTRIBUTE;
            for (int i = 0; i < 2; i++) 
            {            
              DTMAxisTraverser atraverser = dtm.getAxisTraverser(xaxis);
        
              for (int arelative = atraverser.first(relative); 
                      DTM.NULL != arelative;
                      arelative = atraverser.next(relative, arelative))
              {

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

    int context = getArg0AsNode(xctxt);
    XObject val;


    if (DTM.NULL != context)
    {
      DTM dtm = xctxt.getDTM(context);
      String qname = dtm.getNodeNameX(context);
      val = (null == qname) ? XString.EMPTYSTRING : new XString(qname);
    }
    else
    {
      val = XString.EMPTYSTRING;

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

   */
  protected String nodeToString(int n)
  {
    if(DTM.NULL != n)
    {
      DTM dtm = m_lpi.getXPathContext().getDTM(n);
      return dtm.getNodeName(n) + "{" + (n+1) + "}";
    }
    else
    {
      return "null";
    }

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

    {
      String ref = null;
//      DOMHelper dh = xctxt.getDOMHelper();
      StringTokenizer tokenizer = new StringTokenizer(refval);
      boolean hasMore = tokenizer.hasMoreTokens();
      DTM dtm = xctxt.getDTM(docContext);


      while (hasMore)
      {
        ref = tokenizer.nextToken();
        hasMore = tokenizer.hasMoreTokens();


        if ((null != usedrefs) && usedrefs.contains(ref))
        {
          ref = null;


          continue;
        }


        int node = dtm.getElementById(ref);


        if (DTM.NULL != node)
          nodeSet.addNodeInDocOrder(node, xctxt);


        if ((null != ref) && (hasMore || mayBeMore))

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

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


    int context = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(context);
    int docContext = dtm.getDocument();


    if (DTM.NULL == docContext)
      error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);


    XObject arg = m_arg0.execute(xctxt);
    int argType = arg.getType();
    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM nodeSet = nodes.mutableNodeset();


    if (XObject.CLASS_NODESET == argType)
    {
      DTMIterator ni = arg.iter();
      StringVector usedrefs = null;
      int pos = ni.nextNode();


      while (DTM.NULL != pos)
      {
        DTM ndtm = ni.getDTM(pos);
        String refval = ndtm.getStringValue(pos).toString();


        pos = ni.nextNode();
        usedrefs = getNodesByID(xctxt, docContext, refval, usedrefs, nodeSet,
                                DTM.NULL != pos);
      }

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

  {


    int context = getArg0AsNode(xctxt);
    if(DTM.NULL == context)
      return XString.EMPTYSTRING;
    DTM dtm = xctxt.getDTM(context);
    String s = (context != DTM.NULL) ? dtm.getLocalName(context) : "";
    if(s.startsWith("#") || s.equals("xmlns"))
      return XString.EMPTYSTRING;


    return new XString(s);
  }

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

    {
      result = new XNumber(((Number) val));
    }
    else if (val instanceof DTM)
    {
      DTM dtm = (DTM)val;
      try
      {
        int dtmRoot = dtm.getDocument();
        DTMAxisIterator iter = dtm.getAxisIterator(Axis.SELF);
        iter.setStartNode(dtmRoot);
        DTMIterator iterator = new OneStepIterator(iter, Axis.SELF);
        iterator.setRoot(dtmRoot, xctxt);
        result = new XNodeSet(iterator);
      }

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