| /* |
| * 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 org.apache.xml.dtm.DTM; |
| import org.apache.xml.dtm.DTMIterator; |
| |
| 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.axes.SubContextList; |
| import org.apache.xpath.axes.ContextNodeList; |
| import org.apache.xpath.NodeSetDTM; |
| |
| /** |
| * <meta name="usage" content="advanced"/> |
| * Execute the Position() function. |
| */ |
| public class FuncPosition extends Function |
| { |
| |
| /** |
| * Get the position in the current context node list. |
| * |
| * @param xctxt Runtime XPath context. |
| * |
| * @return The current position of the itteration in the context node list, |
| * or -1 if there is no active context node list. |
| */ |
| public int getPositionInContextNodeList(XPathContext xctxt) |
| { |
| |
| // System.out.println("FuncPosition- entry"); |
| // If we're in a predicate, then this will return non-null. |
| SubContextList iter = xctxt.getSubContextList(); |
| |
| if (null != iter) |
| { |
| int prox = iter.getProximityPosition(xctxt); |
| |
| // System.out.println("FuncPosition- prox: "+prox); |
| return prox; |
| } |
| |
| DTMIterator cnl = xctxt.getContextNodeList(); |
| |
| if (null != cnl) |
| { |
| int n = cnl.getCurrentNode(); |
| if(n == DTM.NULL) |
| { |
| if(cnl.getCurrentPos() == 0) |
| return 0; |
| |
| // Then I think we're in a sort. See sort21.xsl. So the iterator has |
| // already been spent, and is not on the node we're processing. |
| // It's highly possible that this is an issue for other context-list |
| // functions. Shouldn't be a problem for last(), and it shouldn't be |
| // a problem for current(). |
| try |
| { |
| cnl = cnl.cloneWithReset(); |
| } |
| catch(CloneNotSupportedException cnse) |
| { |
| throw new org.apache.xml.utils.WrappedRuntimeException(cnse); |
| } |
| int currentNode = xctxt.getContextNode(); |
| // System.out.println("currentNode: "+currentNode); |
| while(DTM.NULL != (n = cnl.nextNode())) |
| { |
| if(n == currentNode) |
| break; |
| } |
| } |
| // System.out.println("n: "+n); |
| // System.out.println("FuncPosition- cnl.getCurrentPos(): "+cnl.getCurrentPos()); |
| return cnl.getCurrentPos(); |
| } |
| |
| // System.out.println("FuncPosition - out of guesses: -1"); |
| return -1; |
| } |
| |
| /** |
| * 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 |
| { |
| double pos = (double) getPositionInContextNodeList(xctxt); |
| |
| return new XNumber(pos); |
| } |
| |
| /** |
| * No arguments to process, so this does nothing. |
| */ |
| public void fixupVariables(java.util.Vector vars, int globalsSize) |
| { |
| // no-op |
| } |
| } |