1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Copyright  1999-2004 The Apache Software Foundation.
   7  *
   8  *  Licensed under the Apache License, Version 2.0 (the "License");
   9  *  you may not use this file except in compliance with the License.
  10  *  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  *  Unless required by applicable law or agreed to in writing, software
  15  *  distributed under the License is distributed on an "AS IS" BASIS,
  16  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  *  See the License for the specific language governing permissions and
  18  *  limitations under the License.
  19  *
  20  */
  21 package com.sun.org.apache.xml.internal.security.utils;
  22 
  23 import com.sun.org.apache.xpath.internal.CachedXPathAPI;
  24 import org.w3c.dom.Document;
  25 
  26 /**
  27  * @author Raul Benito
  28  */
  29 public class CachedXPathAPIHolder {
  30 
  31     static ThreadLocal<CachedXPathAPI>  local=new ThreadLocal<CachedXPathAPI>();
  32     static ThreadLocal<Document> localDoc=new ThreadLocal<Document>();
  33 
  34     /**
  35      * Sets the doc for the xpath transformation. Resets the cache if needed
  36      * @param doc
  37      */
  38     public static void setDoc(Document doc) {
  39         if (localDoc.get()!=doc) {
  40             CachedXPathAPI cx=local.get();
  41             if (cx==null) {
  42                 cx=new CachedXPathAPI();
  43                 local.set(cx);
  44                 localDoc.set(doc);
  45                 return;
  46             }
  47             //Different docs reset.
  48             cx.getXPathContext().reset();
  49             localDoc.set(doc);
  50         }
  51     }
  52 
  53     /**
  54      * @return the cachexpathapi for this thread
  55      */
  56     public static CachedXPathAPI getCachedXPathAPI() {
  57         CachedXPathAPI cx=local.get();
  58         if (cx==null) {
  59             cx=new CachedXPathAPI();
  60             local.set(cx);
  61             localDoc.set(null);
  62         }
  63         return cx;
  64     }
  65 }