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!!

    try
    {
      if (null != m_exprs)
      {
        int n = m_exprs.length;
        DTMIterator newIters[] = new DTMIterator[n];
  
        for (int i = 0; i < n; i++)
        {
          DTMIterator iter = m_exprs[i].asIterator(m_execContext, context);
          newIters[i] = iter;
          iter.nextNode();
        }
        m_iterators = newIters;
      }
    }
    catch(Exception e)

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            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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  public Expression locationPath(int opPos) throws TransformerException
  {
    locPathDepth++;
    try
    {
      DTMIterator iter = WalkerFactory.newDTMIterator(this, opPos, (locPathDepth == 0));
      return (Expression)iter; // cast OK, I guess.
    }
    finally
    {
      locPathDepth--;

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   * @return the first node out of the nodeset, or DTM.NULL.
   */
  public int asNode(XPathContext xctxt)
    throws javax.xml.transform.TransformerException
  {
    DTMIterator iter = (DTMIterator)m_clones.getInstance();
    
    int current = xctxt.getCurrentNode();
    
    iter.setRoot(current, xctxt);


    int next = iter.nextNode();
    // m_clones.freeInstance(iter);
    iter.detach();
    return next;
  }

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    try
    {
      if (null != m_exprs)
      {
        int n = m_exprs.length;
        DTMIterator newIters[] = new DTMIterator[n];
  
        for (int i = 0; i < n; i++)
        {
          DTMIterator iter = m_exprs[i].asIterator(m_execContext, context);
          newIters[i] = iter;
          iter.nextNode();
        }
        m_iterators = newIters;
      }
    }
    catch(Exception e)

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  {


    int firstStepPos = compiler.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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      return (DTMIterator)m_orig.clone();
    }
    else
    {
      // Remove object from end of free pool.
      DTMIterator result = (DTMIterator)m_freeStack.lastElement();


      m_freeStack.setSize(m_freeStack.size() - 1);


      return result;
    }

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      }
    }
    else
    {
      // Remove object from end of free pool.
      DTMIterator result = (DTMIterator)m_freeStack.lastElement();


      m_freeStack.setSize(m_freeStack.size() - 1);


      return result;
    }

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          if (lookupKey.equals(exprResult))
            return DTMIterator.FILTER_ACCEPT;
        }
        else
        {
          DTMIterator nl = ((XNodeSet)xuse).iterRaw();
          int useNode;
          
          while (DTM.NULL != (useNode = nl.nextNode()))
          {
            DTM dtm = getDTM(useNode);
            XMLString exprResult = dtm.getStringValue(useNode);
            if ((null != exprResult) && lookupKey.equals(exprResult))
              return DTMIterator.FILTER_ACCEPT;

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   * @throws javax.xml.transform.TransformerException
   */
  public int asNode(XPathContext xctxt)
          throws javax.xml.transform.TransformerException
  {
    DTMIterator iter = execute(xctxt).iter();
    return iter.nextNode();
  }

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