/*
* 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: FuncLast.java,v 1.2.4.1 2005/09/14 20:18:43 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.functions;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.axes.SubContextList;
import com.sun.org.apache.xpath.internal.compiler.Compiler;
import com.sun.org.apache.xpath.internal.objects.XNumber;
import com.sun.org.apache.xpath.internal.objects.XObject;
/**
* Execute the Last() function.
* @xsl.usage advanced
*/
public class FuncLast extends Function
{
static final long serialVersionUID = 9205812403085432943L;
private boolean m_isTopLevel;
/**
* Figure out if we're executing a toplevel expression.
* If so, we can't be inside of a predicate.
*/
public void postCompileStep(Compiler compiler)
{
m_isTopLevel = compiler.getLocationPathDepth() == -1;
}
/**
* Get the position in the current context node list.
*
* @param xctxt non-null reference to XPath runtime context.
*
* @return The number of nodes in the list.
*
* @throws javax.xml.transform.TransformerException
*/
public int getCountOfContextNodeList(XPathContext xctxt)
throws javax.xml.transform.TransformerException
{
// assert(null != m_contextNodeList, "m_contextNodeList must be non-null");
// If we're in a predicate, then this will return non-null.
SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList();
// System.out.println("iter: "+iter);
if (null != iter)
return iter.getLastPos(xctxt);
DTMIterator cnl = xctxt.getContextNodeList();
int count;
if(null != cnl)
{
count = cnl.getLength();
// System.out.println("count: "+count);
}
else
count = 0;
return count;
}
/**
* 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
{
XNumber xnum = new XNumber((double) getCountOfContextNodeList(xctxt));
// System.out.println("last: "+xnum.num());
return xnum;
}
/**
* No arguments to process, so this does nothing.
*/
public void fixupVariables(java.util.Vector vars, int globalsSize)
{
// no-op
}
}