- /*
- * 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;
- import org.apache.xpath.compiler.Compiler;
-
- /**
- * <meta name="usage" content="advanced"/>
- * Execute the Position() function.
- */
- public class FuncPosition extends Function
- {
- 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 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 = m_isTopLevel ? null : 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
- }
- }