- package org.apache.xpath.axes;
-
- import javax.xml.transform.TransformerException;
-
- import org.apache.xpath.compiler.Compiler;
- import org.apache.xpath.patterns.NodeTest;
- import org.apache.xpath.XPathContext;
- import org.apache.xml.utils.PrefixResolver;
-
- //import org.w3c.dom.Node;
- //import org.w3c.dom.DOMException;
- import org.apache.xml.dtm.DTM;
-
- /**
- * <meta name="usage" content="advanced"/>
- * This class implements an optimized iterator for
- * "." patterns, that is, the self axes without any predicates.
- * @see org.apache.xpath.axes.WalkerFactory#newLocPathIterator
- */
- public class SelfIteratorNoPredicate extends LocPathIterator
- {
-
- /**
- * Create a SelfIteratorNoPredicate object.
- *
- * @param compiler A reference to the Compiler that contains the op map.
- * @param opPos The position within the op map, which contains the
- * location path expression for this itterator.
- * @param analysis Analysis bits.
- *
- * @throws javax.xml.transform.TransformerException
- */
- SelfIteratorNoPredicate(Compiler compiler, int opPos, int analysis)
- throws javax.xml.transform.TransformerException
- {
- super(compiler, opPos, analysis, false);
- }
-
- /**
- * Create a SelfIteratorNoPredicate object.
- *
- * @param compiler A reference to the Compiler that contains the op map.
- * @param opPos The position within the op map, which contains the
- * location path expression for this itterator.
- * @param analysis Analysis bits.
- *
- * @throws javax.xml.transform.TransformerException
- */
- public SelfIteratorNoPredicate()
- throws javax.xml.transform.TransformerException
- {
- super(null);
- }
-
-
- /**
- * Returns the next node in the set and advances the position of the
- * iterator in the set. After a NodeIterator is created, the first call
- * to nextNode() returns the first node in the set.
- *
- * @return The next <code>Node</code> in the set being iterated over, or
- * <code>null</code> if there are no more members in that set.
- */
- public int nextNode()
- {
- if (m_foundLast)
- return DTM.NULL;
-
- int next;
- DTM dtm = m_cdtm;
-
- m_lastFetched = next = (DTM.NULL == m_lastFetched)
- ? m_context
- : DTM.NULL;
-
- // m_lastFetched = next;
- if (DTM.NULL != next)
- {
- m_pos++;
-
- return next;
- }
- else
- {
- m_foundLast = true;
-
- return DTM.NULL;
- }
- }
-
- /**
- * Return the first node out of the nodeset, if this expression is
- * a nodeset expression. This is the default implementation for
- * nodesets. Derived classes should try and override this and return a
- * value without having to do a clone operation.
- * @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
- {
- return xctxt.getCurrentNode();
- }
-
- /**
- * Get the index of the last node that can be itterated to.
- * This probably will need to be overridded by derived classes.
- *
- * @param xctxt XPath runtime context.
- *
- * @return the index of the last node that can be itterated to.
- */
- public int getLastPos(XPathContext xctxt)
- {
- return 1;
- }
-
-
- }