1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.servlet;
16  
17  import javax.servlet.jsp.JspFactory;
18  
19  /**
20   * <a href="JspFactorySwapper.java.html"><b><i>View Source</i></b></a>
21   *
22   * @author Shuyang Zhou
23   */
24  public class JspFactorySwapper {
25  
26      public static void swap() {
27          JspFactory jspFactory = JspFactory.getDefaultFactory();
28  
29          if (jspFactory instanceof JspFactoryWrapper) {
30              return;
31          }
32  
33          synchronized (JspFactorySwapper.class) {
34              if (_jspFactoryWrapper == null) {
35                  _jspFactoryWrapper = new JspFactoryWrapper(jspFactory);
36              }
37  
38              JspFactory.setDefaultFactory(_jspFactoryWrapper);
39          }
40      }
41  
42      private static JspFactoryWrapper _jspFactoryWrapper;
43  
44  }