| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id: SelfIteratorNoPredicate.java 469263 2006-10-30 20:45:40Z minchau $ |
| */ |
| package org.apache.xpath.axes; |
| |
| import org.apache.xml.dtm.DTM; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.compiler.Compiler; |
| |
| /** |
| * This class implements an optimized iterator for |
| * "." patterns, that is, the self axes without any predicates. |
| * @see org.apache.xpath.axes.LocPathIterator |
| * @xsl.usage advanced |
| */ |
| public class SelfIteratorNoPredicate extends LocPathIterator |
| { |
| static final long serialVersionUID = -4226887905279814201L; |
| |
| /** |
| * 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. |
| * |
| * @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; |
| |
| 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; |
| } |
| |
| |
| } |