- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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,v 1.20 2004/02/17 04:32:08 minchau Exp $
- */
- package com.sun.org.apache.xpath.internal.axes;
-
- import com.sun.org.apache.xml.internal.dtm.Axis;
- import com.sun.org.apache.xml.internal.dtm.DTM;
- import com.sun.org.apache.xml.internal.dtm.DTMAxisTraverser;
- import com.sun.org.apache.xml.internal.dtm.DTMIterator;
- import com.sun.org.apache.xpath.internal.compiler.Compiler;
-
- /**
- * This class implements an optimized iterator for
- * children patterns that have a node test, and possibly a predicate.
- * @see com.sun.org.apache.xpath.internal.axes.BasicTestIterator
- * @xsl.usage advanced
- */
- public class ChildTestIterator extends BasicTestIterator
- {
- /** 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 execContext 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 com.sun.org.apache.xml.internal.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();
- }
- }
-
- }