/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*
*/
package org.apache.xml.security.utils;
import org.apache.xpath.CachedXPathAPI;
import org.w3c.dom.Document;
/**
* @author Raul Benito
*/
public class CachedXPathAPIHolder {
static ThreadLocal local=new ThreadLocal();
static ThreadLocal localDoc=new ThreadLocal();
/**
* Sets the doc for the xpath transformation. Resets the cache if needed
* @param doc
*/
public static void setDoc(Document doc) {
if (localDoc.get()!=doc) {
CachedXPathAPI cx=(CachedXPathAPI)local.get();
if (cx==null) {
cx=new CachedXPathAPI();
local.set(cx);
localDoc.set(doc);
return;
}
//Different docs reset.
cx.getXPathContext().reset();
localDoc.set(doc);
}
}
/**
* @return the cachexpathapi for this thread
*/
public static CachedXPathAPI getCachedXPathAPI() {
CachedXPathAPI cx=(CachedXPathAPI)local.get();
if (cx==null) {
cx=new CachedXPathAPI();
local.set(cx);
localDoc.set(null);
}
return cx;
}
}