org.apache.xpath.axes.SelfIteratorNoPredicate Maven / Gradle / Ivy
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Serializer to write out XML, HTML etc. as a stream of characters from an input DOM or from input
SAX events.
/*
* 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 Node
in the set being iterated over, or
* null
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;
}
}