1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * @LastModified: Oct 2017
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.xpath.internal.functions;
  23 
  24 import com.sun.org.apache.xalan.internal.res.XSLMessages;
  25 import com.sun.org.apache.xalan.internal.res.XSLTErrorResources;
  26 import com.sun.org.apache.xml.internal.dtm.DTM;
  27 import com.sun.org.apache.xml.internal.utils.QName;
  28 import com.sun.org.apache.xpath.internal.XPathContext;
  29 import com.sun.org.apache.xpath.internal.axes.LocPathIterator;
  30 import com.sun.org.apache.xpath.internal.axes.PredicatedNodeTest;
  31 import com.sun.org.apache.xpath.internal.axes.SubContextList;
  32 import com.sun.org.apache.xpath.internal.objects.XNodeSet;
  33 import com.sun.org.apache.xpath.internal.objects.XObject;
  34 import com.sun.org.apache.xpath.internal.patterns.StepPattern;
  35 import java.util.List;
  36 
  37 
  38 /**
  39  * Execute the current() function.
  40  * @xsl.usage advanced
  41  */
  42 public class FuncCurrent extends Function
  43 {
  44     static final long serialVersionUID = 5715316804877715008L;
  45 
  46   /**
  47    * Execute the function.  The function must return
  48    * a valid object.
  49    * @param xctxt The current execution context.
  50    * @return A valid XObject.
  51    *
  52    * @throws javax.xml.transform.TransformerException
  53    */
  54   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  55   {
  56 
  57     SubContextList subContextList = xctxt.getCurrentNodeList();
  58     int currentNode = DTM.NULL;
  59 
  60     if (null != subContextList) {
  61         if (subContextList instanceof PredicatedNodeTest) {
  62             LocPathIterator iter = ((PredicatedNodeTest)subContextList)
  63                                                           .getLocPathIterator();
  64             currentNode = iter.getCurrentContextNode();
  65          } else if(subContextList instanceof StepPattern) {
  66            throw new RuntimeException(XSLMessages.createMessage(
  67               XSLTErrorResources.ER_PROCESSOR_ERROR,null));
  68          }
  69     } else {
  70         // not predicate => ContextNode == CurrentNode
  71         currentNode = xctxt.getContextNode();
  72     }
  73     return new XNodeSet(currentNode, xctxt.getDTMManager());
  74   }
  75 
  76   /**
  77    * No arguments to process, so this does nothing.
  78    */
  79   public void fixupVariables(List<QName> vars, int globalsSize)
  80   {
  81     // no-op
  82   }
  83 
  84 }