19f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 29f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one 39f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or more contributor license agreements. See the NOTICE file 49f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed with this work for additional information 59f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * regarding copyright ownership. The ASF licenses this file 69f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to you under the Apache License, Version 2.0 (the "License"); 79f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * you may not use this file except in compliance with the License. 89f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * You may obtain a copy of the License at 99f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Unless required by applicable law or agreed to in writing, software 139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * See the License for the specific language governing permissions and 169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * limitations under the License. 179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * $Id: FuncPosition.java 468655 2006-10-28 07:12:06Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xpath.functions; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xml.dtm.DTM; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xml.dtm.DTMIterator; 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathContext; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.axes.SubContextList; 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.compiler.Compiler; 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XNumber; 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XObject; 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Execute the Position() function. 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @xsl.usage advanced 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class FuncPosition extends Function 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson static final long serialVersionUID = -9092846348197271582L; 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson private boolean m_isTopLevel; 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Figure out if we're executing a toplevel expression. 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * If so, we can't be inside of a predicate. 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void postCompileStep(Compiler compiler) 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_isTopLevel = compiler.getLocationPathDepth() == -1; 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Get the position in the current context node list. 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param xctxt Runtime XPath context. 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return The current position of the itteration in the context node list, 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or -1 if there is no active context node list. 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public int getPositionInContextNodeList(XPathContext xctxt) 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("FuncPosition- entry"); 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // If we're in a predicate, then this will return non-null. 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson SubContextList iter = m_isTopLevel ? null : xctxt.getSubContextList(); 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if (null != iter) 659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson int prox = iter.getProximityPosition(xctxt); 679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("FuncPosition- prox: "+prox); 699f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return prox; 709f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 719f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 729f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson DTMIterator cnl = xctxt.getContextNodeList(); 739f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 749f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if (null != cnl) 759f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 769f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson int n = cnl.getCurrentNode(); 779f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(n == DTM.NULL) 789f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 799f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(cnl.getCurrentPos() == 0) 809f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return 0; 819f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 829f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // Then I think we're in a sort. See sort21.xsl. So the iterator has 839f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // already been spent, and is not on the node we're processing. 849f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // It's highly possible that this is an issue for other context-list 859f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // functions. Shouldn't be a problem for last(), and it shouldn't be 869f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // a problem for current(). 879f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson try 889f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 899f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson cnl = cnl.cloneWithReset(); 909f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 919f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson catch(CloneNotSupportedException cnse) 929f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 939f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson throw new org.apache.xml.utils.WrappedRuntimeException(cnse); 949f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 959f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson int currentNode = xctxt.getContextNode(); 969f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("currentNode: "+currentNode); 979f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson while(DTM.NULL != (n = cnl.nextNode())) 989f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 999f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(n == currentNode) 1009f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson break; 1019f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1029f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1039f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("n: "+n); 1049f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("FuncPosition- cnl.getCurrentPos(): "+cnl.getCurrentPos()); 1059f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return cnl.getCurrentPos(); 1069f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1079f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1089f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // System.out.println("FuncPosition - out of guesses: -1"); 1099f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return -1; 1109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Execute the function. The function must return 1149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * a valid object. 1159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param xctxt The current execution context. 1169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return A valid XObject. 1179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 1199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 1219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson double pos = (double) getPositionInContextNodeList(xctxt); 1239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return new XNumber(pos); 1259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * No arguments to process, so this does nothing. 1299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void fixupVariables(java.util.Vector vars, int globalsSize) 1319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson // no-op 1339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 135