/*
* 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: FuncCurrent.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.functions;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xpath.XPathContext;
import org.apache.xpath.axes.LocPathIterator;
import org.apache.xpath.axes.PredicatedNodeTest;
import org.apache.xpath.objects.XNodeSet;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.axes.SubContextList;
import org.apache.xpath.patterns.StepPattern;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
/**
* Execute the current() function.
* @xsl.usage advanced
*/
public class FuncCurrent extends Function
{
static final long serialVersionUID = 5715316804877715008L;
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
SubContextList subContextList = xctxt.getCurrentNodeList();
int currentNode = DTM.NULL;
if (null != subContextList) {
if (subContextList instanceof PredicatedNodeTest) {
LocPathIterator iter = ((PredicatedNodeTest)subContextList)
.getLocPathIterator();
currentNode = iter.getCurrentContextNode();
} else if(subContextList instanceof StepPattern) {
throw new RuntimeException(XSLMessages.createMessage(
XSLTErrorResources.ER_PROCESSOR_ERROR,null));
}
} else {
// not predicate => ContextNode == CurrentNode
currentNode = xctxt.getContextNode();
}
return new XNodeSet(currentNode, xctxt.getDTMManager());
}
/**
* No arguments to process, so this does nothing.
*/
public void fixupVariables(java.util.Vector vars, int globalsSize)
{
// no-op
}
}