Node in the set being iterated over, or
* null if there are no more members in that set.
*
* @throws DOMException
* INVALID_STATE_ERR: Raised if this method is called after the
* detach method was invoked.
*/
public int nextNode()
{
if(m_foundLast)
return DTM.NULL;
if(DTM.NULL == m_lastFetched)
{
resetProximityPositions();
}
int next;
com.sun.org.apache.xpath.internal.VariableStack vars;
int savedStart;
if (-1 != m_stackFrame)
{
vars = m_execContext.getVarStack();
// These three statements need to be combined into one operation.
savedStart = vars.getStackFrame();
vars.setStackFrame(m_stackFrame);
}
else
{
// Yuck. Just to shut up the compiler!
vars = null;
savedStart = 0;
}
try
{
do
{
if(0 == m_extendedTypeID)
{
next = m_lastFetched = (DTM.NULL == m_lastFetched)
? m_traverser.first(m_context)
: m_traverser.next(m_context, m_lastFetched);
}
else
{
next = m_lastFetched = (DTM.NULL == m_lastFetched)
? m_traverser.first(m_context, m_extendedTypeID)
: m_traverser.next(m_context, m_lastFetched,
m_extendedTypeID);
}
if (DTM.NULL != next)
{
if(DTMIterator.FILTER_ACCEPT == acceptNode(next))
break;
else
continue;
}
else
break;
}
while (next != DTM.NULL);
if (DTM.NULL != next)
{
m_pos++;
return next;
}
else
{
m_foundLast = true;
return DTM.NULL;
}
}
finally
{
if (-1 != m_stackFrame)
{
// These two statements need to be combined into one operation.
vars.setStackFrame(savedStart);
}
}
}
/**
* Initialize the context values for this expression
* after it is cloned.
*
* @param execContext The XPath runtime context for this
* transformation.
*/
public void setRoot(int context, Object environment)
{
super.setRoot(context, environment);
m_traverser = m_cdtm.getAxisTraverser(m_axis);
String localName = getLocalName();
String namespace = getNamespace();
int what = m_whatToShow;
// System.out.println("what: ");
// NodeTest.debugWhatToShow(what);
if(DTMFilter.SHOW_ALL == what
|| localName == NodeTest.WILD
|| namespace == NodeTest.WILD)
{
m_extendedTypeID = 0;
}
else
{
int type = getNodeTypeTest(what);
m_extendedTypeID = m_cdtm.getExpandedTypeID(namespace, localName, type);
}
}
/**
* Return the first node out of the nodeset, if this expression is
* a nodeset expression. This is the default implementation for
* nodesets.
* WARNING: Do not mutate this class from this function!
* @param xctxt The XPath runtime context. * @return the first node out of the nodeset, or DTM.NULL. */ public int asNode(XPathContext xctxt) throws javax.xml.transform.TransformerException { 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); } } /** * Detaches the iterator from the set which it iterated over, releasing * any computational resources and placing the iterator in the INVALID * state. Afterdetach has been invoked, calls to
* nextNode orpreviousNode will raise the
* exception INVALID_STATE_ERR.
*/
public void detach()
{
if (m_allowDetach) {
m_traverser = null;
m_extendedTypeID = 0;
// Always call the superclass detach last!
super.detach();
}
}
/**
* Returns the axis being iterated, if it is known.
*
* @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple
* types.
*/
public int getAxis()
{
return m_axis;
}
/** The traverser to use to navigate over the descendants. */
transient protected DTMAxisTraverser m_traverser;
/** The axis that we are traversing. */
protected int m_axis;
/** The extended type ID, not set until setRoot. */
protected int m_extendedTypeID;
/**
* @see Expression#deepEquals(Expression)
*/
public boolean deepEquals(Expression expr)
{
if(!super.deepEquals(expr))
return false;
if(m_axis != ((DescendantIterator)expr).m_axis)
return false;
return true;
}
}