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Java > Open Source Codes > org > snipsnap > interceptor > custom > MissingSnipInterceptor


1 /*
2  * This file is part of "SnipSnap Wiki/Weblog".
3  *
4  * Copyright (c) 2002 Stephan J. Schmidt, Matthias L. Jugel
5  * All Rights Reserved.
6  *
7  * Please visit http://snipsnap.org/ for updates and contact.
8  *
9  * --LICENSE NOTICE--
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version 2
13  * of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23  * --LICENSE NOTICE--
24  */
25
26 package org.snipsnap.interceptor.custom;
27
28 import org.snipsnap.interceptor.InterceptorSupport;
29 import org.snipsnap.interceptor.Invocation;
30
31 import java.util.HashMap JavaDoc;
32 import java.util.Map JavaDoc;
33
34 /**
35  * MissingLSnip interceptor caches method call result
36  * from SnipSpace (exists, create).
37  * When a missing snip is detected the
38  * snip name is stored. When the snip is created
39  * the snip is removed from the missing list.
40  *
41  * @author stephan
42  * @version $Id: MissingSnipInterceptor.java 820 2003-03-26 08:03:09Z stephan $
43  */
44
45 public class MissingSnipInterceptor extends InterceptorSupport {
46   private Map JavaDoc missing;
47
48   public MissingSnipInterceptor() {
49     super();
50     missing = new HashMap JavaDoc();
51   }
52
53   public Object JavaDoc invoke(Invocation invocation) throws Throwable JavaDoc {
54     String JavaDoc methodName = invocation.getMethod().getName();
55
56     if ("exists".equals(methodName)) {
57       String JavaDoc name = ((String JavaDoc) invocation.getArgs()[0]).toUpperCase();
58       // Snip is in the missing list
59 if (missing.containsKey(name)) {
60         return new Boolean JavaDoc(false);
61       }
62       Boolean JavaDoc result = (Boolean JavaDoc) invocation.next();
63       // The snip does not exist so put it in the missing list
64 if (result.equals(Boolean.FALSE)) {
65         missing.put(name, new Integer JavaDoc(0));
66       }
67       return result;
68
69     } else if ("create".equals(methodName)) {
70       String JavaDoc name = ((String JavaDoc) invocation.getArgs()[0]).toUpperCase();
71
72       Object JavaDoc result = invocation.next();
73
74       if (missing.containsKey(name)) {
75         missing.remove(name);
76       }
77       return result;
78     } else {
79       // Other method
80 return invocation.next();
81     }
82   }
83 }
84
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