1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 /* 19 * $Id: FuncCurrent.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.functions; 22 23 import org.apache.xml.dtm.DTM; 24 import org.apache.xml.dtm.DTMIterator; 25 import org.apache.xpath.XPathContext; 26 import org.apache.xpath.axes.LocPathIterator; 27 import org.apache.xpath.axes.PredicatedNodeTest; 28 import org.apache.xpath.objects.XNodeSet; 29 import org.apache.xpath.objects.XObject; 30 import org.apache.xpath.axes.SubContextList; 31 import org.apache.xpath.patterns.StepPattern; 32 import org.apache.xalan.res.XSLMessages; 33 import org.apache.xalan.res.XSLTErrorResources; 34 35 36 /** 37 * Execute the current() function. 38 * @xsl.usage advanced 39 */ 40 public class FuncCurrent extends Function 41 { 42 static final long serialVersionUID = 5715316804877715008L; 43 44 /** 45 * Execute the function. The function must return 46 * a valid object. 47 * @param xctxt The current execution context. 48 * @return A valid XObject. 49 * 50 * @throws javax.xml.transform.TransformerException 51 */ execute(XPathContext xctxt)52 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 53 { 54 55 SubContextList subContextList = xctxt.getCurrentNodeList(); 56 int currentNode = DTM.NULL; 57 58 if (null != subContextList) { 59 if (subContextList instanceof PredicatedNodeTest) { 60 LocPathIterator iter = ((PredicatedNodeTest)subContextList) 61 .getLocPathIterator(); 62 currentNode = iter.getCurrentContextNode(); 63 } else if(subContextList instanceof StepPattern) { 64 throw new RuntimeException(XSLMessages.createMessage( 65 XSLTErrorResources.ER_PROCESSOR_ERROR,null)); 66 } 67 } else { 68 // not predicate => ContextNode == CurrentNode 69 currentNode = xctxt.getContextNode(); 70 } 71 return new XNodeSet(currentNode, xctxt.getDTMManager()); 72 } 73 74 /** 75 * No arguments to process, so this does nothing. 76 */ fixupVariables(java.util.Vector vars, int globalsSize)77 public void fixupVariables(java.util.Vector vars, int globalsSize) 78 { 79 // no-op 80 } 81 82 } 83