Examples of org.apache.xml.dtm.DTMIterator

org.apache.xml.dtm.DTMIterator
3.org/TR/xpath#NT-LocationPath>LocationPath or a UnionExpr.

A DTMIterator is meant to be created once as a master static object, and then cloned many times for runtime use. Or the master object itself may be used for simpler use cases.

At this time, we do not expect DTMIterator to emulate NodeIterator's "maintain relative position" semantics under document mutation. It's likely to respond more like the TreeWalker's "current node" semantics. However, since the base DTM is immutable, this issue currently makes no practical difference.

State: In progress!!

      return (DTMIterator)m_orig.clone();
    }
    else
    {
      // Remove object from end of free pool.
      DTMIterator result = (DTMIterator)m_freeStack.remove(m_freeStack.size() - 1);
      return result;
    }
  }

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      }
    }
    else
    {
      // Remove object from end of free pool.
      DTMIterator result = (DTMIterator)m_freeStack.remove(m_freeStack.size() - 1);
      return result;
    }
  }

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            if (xuse.getType() != xuse.CLASS_NODESET) {
              XMLString exprResult = xuse.xstr();
              addValueInRefsTable(xctxt, exprResult, currentNode);
            } else {
              DTMIterator i = ((XNodeSet)xuse).iterRaw();
              int currentNodeInUseClause;


              while (DTM.NULL != (currentNodeInUseClause = i.nextNode())) {
                DTM dtm = xctxt.getDTM(currentNodeInUseClause);
                XMLString exprResult =
                    dtm.getStringValue(currentNodeInUseClause);
                addValueInRefsTable(xctxt, exprResult, currentNode);
              }

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        }


        if (r.getType() == XObject.CLASS_NODESET)
        {
          // %REVIEW%
          DTMIterator ni = ((XNodeSet)r).iterRaw();
          int current = ni.getCurrentNode();
          if(DTM.NULL == current)
            current = ni.nextNode();


          // if (ni instanceof ContextNodeList) // %REVIEW%
          // tryNextKey = (DTM.NULL != current);


          // else abdicate... should never happen, but... -sb

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    }


    if (argIsNodeSetDTM)
    {
      Hashtable usedrefs = null;
      DTMIterator ni = arg.iter();
      int pos;
      UnionPathIterator upi = new UnionPathIterator();
      upi.exprSetParent(this);


      while (DTM.NULL != (pos = ni.nextNode()))
      {
        dtm = xctxt.getDTM(pos);
        XMLString ref = dtm.getStringValue(pos);


        if (null == ref)

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


    DTMIterator nodes = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
    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();


    return new XNumber(sum);
  }

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          return (SQLDocument) root.getDTM();
        }
        catch (Exception e)
        {
          XNodeSet xNS = (XNodeSet)dtmIter.getDTMIterator();
          DTMIterator iter = (DTMIterator)xNS.getContainedIter();
          DTM dtm = iter.getDTM(xNS.nextNode());
          return (SQLDocument)dtm;
        }
      }


/*

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  {


    int firstStepPos = OpMap.getFirstChildPos(opPos);
    int analysis = analyze(compiler, firstStepPos, 0);
    boolean isOneStep = isOneStep(analysis);
    DTMIterator iter;


    // Is the iteration a one-step attribute pattern (i.e. select="@foo")?
    if (isOneStep && walksSelfOnly(analysis) && 
        isWild(analysis) && !hasPredicate(analysis))
    {

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    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);
      }
      // ni.detach();
    }

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      base = xctxt.getNamespaceContext().getBaseIdentifier();
    }


    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM mnl = nodes.mutableNodeset();
    DTMIterator iterator = (XObject.CLASS_NODESET == arg.getType())
                            ? arg.iter() : null;
    int pos = DTM.NULL;


    while ((null == iterator) || (DTM.NULL != (pos = iterator.nextNode())))
    {
      XMLString ref = (null != iterator)
                   ? xctxt.getDTM(pos).getStringValue(pos) : arg.xstr();
      
      // The first and only argument was a nodeset, the base in that

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