/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xpath.functions;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeIterator;
import java.util.Vector;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPath;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.NodeSet;
import org.apache.xpath.axes.LocPathIterator;
import org.apache.xpath.axes.ContextNodeList;
import org.apache.xpath.axes.SubContextList;
/**
* <meta name="usage" content="advanced"/>
* Execute the Last() function.
*/
public class FuncLast extends Function
{
/**
* 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 = xctxt.getSubContextList();
// System.out.println("iter: "+iter);
if (null != iter)
return iter.getLastPos(xctxt);
ContextNodeList cnl = xctxt.getContextNodeList();
if (cnl.size() == 0)
{
try
{
NodeIterator ni = (NodeIterator)cnl.clone();
int count = cnl.getCurrentPos();
while(null != ni.nextNode())
count++;
cnl.setLast(count);
return count;
}
catch(CloneNotSupportedException cnse){}
}
return cnl.size();
/*
// The code below has massive problem if inside of a predicate. -sb
if (cnl.size() == 0)
{
int currentPos = cnl.getCurrentPos();
// This has problems if inside a predicate. For now, just clone.
if (!cnl.isFresh())
cnl.reset();
cnl.setShouldCacheNodes(true);
cnl.runTo(-1);
cnl.setCurrentPos(currentPos);
System.out.println("cnl.getCurrentPos() after: "+cnl.getCurrentPos());
}
// System.out.println("cnl.size(): "+cnl.size());
return cnl.size();
*/
}
/**
* 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;
}
}