| /* |
| * 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(); |
| |
| 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 |
| { |
| return new XNumber((double) getCountOfContextNodeList(xctxt)); |
| } |
| } |