/*
* 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: SelfIteratorNoPredicate.java,v 1.2.4.2 2005/09/14 19:45:21 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.axes;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.compiler.Compiler;
/**
* This class implements an optimized iterator for
* "." patterns, that is, the self axes without any predicates.
* @see com.sun.org.apache.xpath.internal.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;
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;
}
}