| /* |
| * 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: ChildTestIterator.java 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xpath.axes; |
| |
| import org.apache.xml.dtm.Axis; |
| import org.apache.xml.dtm.DTM; |
| import org.apache.xml.dtm.DTMAxisTraverser; |
| import org.apache.xml.dtm.DTMIterator; |
| import org.apache.xpath.compiler.Compiler; |
| |
| /** |
| * This class implements an optimized iterator for |
| * children patterns that have a node test, and possibly a predicate. |
| * @see org.apache.xpath.axes.BasicTestIterator |
| * @xsl.usage advanced |
| */ |
| public class ChildTestIterator extends BasicTestIterator |
| { |
| static final long serialVersionUID = -7936835957960705722L; |
| /** The traverser to use to navigate over the descendants. */ |
| transient protected DTMAxisTraverser m_traverser; |
| |
| /** The extended type ID, not set until setRoot. */ |
| // protected int m_extendedTypeID; |
| |
| |
| /** |
| * Create a ChildTestIterator 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. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| ChildTestIterator(Compiler compiler, int opPos, int analysis) |
| throws javax.xml.transform.TransformerException |
| { |
| super(compiler, opPos, analysis); |
| } |
| |
| /** |
| * Create a ChildTestIterator object. |
| * |
| * @param traverser Traverser that tells how the KeyIterator is to be handled. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public ChildTestIterator(DTMAxisTraverser traverser) |
| { |
| |
| super(null); |
| |
| m_traverser = traverser; |
| } |
| |
| /** |
| * Get the next node via getNextXXX. Bottlenecked for derived class override. |
| * @return The next node on the axis, or DTM.NULL. |
| */ |
| protected int getNextNode() |
| { |
| if(true /* 0 == m_extendedTypeID */) |
| { |
| m_lastFetched = (DTM.NULL == m_lastFetched) |
| ? m_traverser.first(m_context) |
| : m_traverser.next(m_context, m_lastFetched); |
| } |
| // else |
| // { |
| // m_lastFetched = (DTM.NULL == m_lastFetched) |
| // ? m_traverser.first(m_context, m_extendedTypeID) |
| // : m_traverser.next(m_context, m_lastFetched, |
| // m_extendedTypeID); |
| // } |
| |
| return m_lastFetched; |
| } |
| |
| |
| /** |
| * Get a cloned Iterator that is reset to the beginning |
| * of the query. |
| * |
| * @return A cloned NodeIterator set of the start of the query. |
| * |
| * @throws CloneNotSupportedException |
| */ |
| public DTMIterator cloneWithReset() throws CloneNotSupportedException |
| { |
| |
| ChildTestIterator clone = (ChildTestIterator) super.cloneWithReset(); |
| clone.m_traverser = m_traverser; |
| |
| return clone; |
| } |
| |
| |
| /** |
| * Initialize the context values for this expression |
| * after it is cloned. |
| * |
| * @param context The XPath runtime context for this |
| * transformation. |
| */ |
| public void setRoot(int context, Object environment) |
| { |
| super.setRoot(context, environment); |
| m_traverser = m_cdtm.getAxisTraverser(Axis.CHILD); |
| |
| // String localName = getLocalName(); |
| // String namespace = getNamespace(); |
| // int what = m_whatToShow; |
| // // System.out.println("what: "); |
| // // NodeTest.debugWhatToShow(what); |
| // if(DTMFilter.SHOW_ALL == what || |
| // ((DTMFilter.SHOW_ELEMENT & what) == 0) |
| // || localName == NodeTest.WILD |
| // || namespace == NodeTest.WILD) |
| // { |
| // m_extendedTypeID = 0; |
| // } |
| // else |
| // { |
| // int type = getNodeTypeTest(what); |
| // m_extendedTypeID = m_cdtm.getExpandedTypeID(namespace, localName, type); |
| // } |
| |
| } |
| |
| /** |
| * 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 org.apache.xml.dtm.Axis.CHILD; |
| } |
| |
| /** |
| * Detaches the iterator from the set which it iterated over, releasing |
| * any computational resources and placing the iterator in the INVALID |
| * state. After<code>detach</code> has been invoked, calls to |
| * <code>nextNode</code> or<code>previousNode</code> will raise the |
| * exception INVALID_STATE_ERR. |
| */ |
| public void detach() |
| { |
| if(m_allowDetach) |
| { |
| m_traverser = null; |
| |
| // Always call the superclass detach last! |
| super.detach(); |
| } |
| } |
| |
| } |