/*
* 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: ContextMatchStepPattern.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.patterns;
import org.apache.xml.dtm.Axis;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMAxisTraverser;
import org.apache.xml.dtm.DTMFilter;
import org.apache.xpath.XPathContext;
import org.apache.xpath.axes.WalkerFactory;
import org.apache.xpath.objects.XObject;
/**
* Special context node pattern matcher.
*/
public class ContextMatchStepPattern extends StepPattern
{
static final long serialVersionUID = -1888092779313211942L;
/**
* Construct a ContextMatchStepPattern.
*
*/
public ContextMatchStepPattern(int axis, int paxis)
{
super(DTMFilter.SHOW_ALL, axis, paxis);
}
/**
* Execute this pattern step, including predicates.
*
*
* @param xctxt XPath runtime context.
*
* @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_NONE},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_NSWILD},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or
* {@link org.apache.xpath.patterns.NodeTest#SCORE_OTHER}.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt)
throws javax.xml.transform.TransformerException
{
if (xctxt.getIteratorRoot() == xctxt.getCurrentNode())
return getStaticScore();
else
return this.SCORE_NONE;
}
/**
* Execute the match pattern step relative to another step.
*
*
* @param xctxt The XPath runtime context.
* NEEDSDOC @param prevStep
*
* @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_NONE},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_NSWILD},
* {@link org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or
* {@link org.apache.xpath.patterns.NodeTest#SCORE_OTHER}.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject executeRelativePathPattern(
XPathContext xctxt, StepPattern prevStep)
throws javax.xml.transform.TransformerException
{
XObject score = NodeTest.SCORE_NONE;
int context = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(context);
if (null != dtm)
{
int predContext = xctxt.getCurrentNode();
DTMAxisTraverser traverser;
int axis = m_axis;
boolean needToTraverseAttrs = WalkerFactory.isDownwardAxisOfMany(axis);
boolean iterRootIsAttr = (dtm.getNodeType(xctxt.getIteratorRoot())
== DTM.ATTRIBUTE_NODE);
if((Axis.PRECEDING == axis) && iterRootIsAttr)
{
axis = Axis.PRECEDINGANDANCESTOR;
}
traverser = dtm.getAxisTraverser(axis);
for (int relative = traverser.first(context); DTM.NULL != relative;
relative = traverser.next(context, relative))
{
try
{
xctxt.pushCurrentNode(relative);
score = execute(xctxt);
if (score != NodeTest.SCORE_NONE)
{
//score = executePredicates( xctxt, prevStep, SCORE_OTHER,
// predContext, relative);
if (executePredicates(xctxt, dtm, context))
return score;
score = NodeTest.SCORE_NONE;
}
if(needToTraverseAttrs && iterRootIsAttr
&& (DTM.ELEMENT_NODE == dtm.getNodeType(relative)))
{
int xaxis = Axis.ATTRIBUTE;
for (int i = 0; i < 2; i++)
{
DTMAxisTraverser atraverser = dtm.getAxisTraverser(xaxis);
for (int arelative = atraverser.first(relative);
DTM.NULL != arelative;
arelative = atraverser.next(relative, arelative))
{
try
{
xctxt.pushCurrentNode(arelative);
score = execute(xctxt);
if (score != NodeTest.SCORE_NONE)
{
//score = executePredicates( xctxt, prevStep, SCORE_OTHER,
// predContext, arelative);
if (score != NodeTest.SCORE_NONE)
return score;
}
}
finally
{
xctxt.popCurrentNode();
}
}
xaxis = Axis.NAMESPACE;
}
}
}
finally
{
xctxt.popCurrentNode();
}
}
}
return score;
}
}