/*
* 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: ChildIterator.java,v 1.2.4.2 2005/09/14 19:45:20 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.axes;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMFilter;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.compiler.Compiler;
/**
* This class implements an optimized iterator for
* "node()" patterns, that is, any children of the
* context node.
* @see com.sun.org.apache.xpath.internal.axes.LocPathIterator
* @xsl.usage advanced
*/
public class ChildIterator extends LocPathIterator
{
static final long serialVersionUID = -6935428015142993583L;
/**
* Create a ChildIterator 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 of the entire pattern.
*
* @throws javax.xml.transform.TransformerException
*/
ChildIterator(Compiler compiler, int opPos, int analysis)
throws javax.xml.transform.TransformerException
{
super(compiler, opPos, analysis, false);
// This iterator matches all kinds of nodes
initNodeTest(DTMFilter.SHOW_ALL);
}
/**
* Return the first node out of the nodeset, if this expression is
* a nodeset expression. This is the default implementation for
* nodesets.
* <p>WARNING: Do not mutate this class from this function!</p>
* @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
{
int current = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(current);
return dtm.getFirstChild(current);
}
/**
* 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_cdtm.getFirstChild(m_context)
: m_cdtm.getNextSibling(m_lastFetched);
// m_lastFetched = next;
if (DTM.NULL != next)
{
m_pos++;
return next;
}
else
{
m_foundLast = true;
return DTM.NULL;
}
}
/**
* 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;
}
}