| 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() |
| { |
| 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; |
| } |
| |
| |
| } |