RegionStack


1   /*
2    * $Id: RegionStack.java 5462 2005-08-05 18:35:48Z jonesde $
3    *
4    * Copyright (c) 2001-2003 Sun Microsystems Inc., published in "Advanced Java Server Pages" by Prentice Hall PTR
5    * Copyright (c) 2002 The Open For Business Project - www.ofbiz.org
6    *
7    * Permission is hereby granted, free of charge, to any person obtaining a
8    * copy of this software and associated documentation files (the "Software"),
9    * to deal in the Software without restriction, including without limitation
10   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11   * and/or sell copies of the Software, and to permit persons to whom the
12   * Software is furnished to do so, subject to the following conditions:
13   *
14   * The above copyright notice and this permission notice shall be included
15   * in all copies or substantial portions of the Software.
16   *
17   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20   * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
21   * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
22   * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
23   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24   *
25   */
26  package org.ofbiz.webapp.region;
27  
28  import java.util.Stack  ;
29  import javax.servlet.ServletRequest  ;
30  
31  public class RegionStack {
32      private RegionStack() {} // no instantiations
33  
34      public static Stack   getStack(ServletRequest   request) {
35          Stack   s = (Stack  ) request.getAttribute("region-stack");
36  
37          if (s == null) {
38              s = new Stack  ();
39              request.setAttribute("region-stack", s);
40          }
41          return s;
42      }
43  
44      public static Region peek(ServletRequest   request) {
45          return (Region) getStack(request).peek();
46      }
47  
48      public static void push(ServletRequest   request, Region region) {
49          getStack(request).push(region);
50      }
51  
52      public static Region pop(ServletRequest   request) {
53          return (Region) getStack(request).pop();
54      }
55  }
56
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