| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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: FuncPosition.java 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xpath.functions; |
| |
| import org.apache.xml.dtm.DTM; |
| import org.apache.xml.dtm.DTMIterator; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.axes.SubContextList; |
| import org.apache.xpath.compiler.Compiler; |
| import org.apache.xpath.objects.XNumber; |
| import org.apache.xpath.objects.XObject; |
| |
| /** |
| * Execute the Position() function. |
| * @xsl.usage advanced |
| */ |
| public class FuncPosition extends Function |
| { |
| static final long serialVersionUID = -9092846348197271582L; |
| 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 |
| } |
| } |