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Java > Open Source Codes > org > mortbay > jetty > servlet > FilterHolder


1 // ========================================================================
2 // $Id: FilterHolder.java,v 1.31 2005/04/07 09:15:33 gregwilkins Exp $
3 // Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 // ========================================================================
15
16 package org.mortbay.jetty.servlet;
17
18 import java.util.Enumeration JavaDoc;
19
20 import javax.servlet.Filter JavaDoc;
21 import javax.servlet.FilterConfig JavaDoc;
22 import javax.servlet.ServletContext JavaDoc;
23
24 import org.mortbay.http.HttpHandler;
25
26 /* --------------------------------------------------------------------- */
27 /**
28  * @version $Id: FilterHolder.java,v 1.31 2005/04/07 09:15:33 gregwilkins Exp $
29  * @author Greg Wilkins
30  */
31 public class FilterHolder
32     extends Holder
33 {
34     /* ------------------------------------------------------------ */
35
36     private transient Filter JavaDoc _filter;
37     private transient Config JavaDoc _config;
38         
39     /* ---------------------------------------------------------------- */
40     /** Constructor for Serialization.
41      */
42     public FilterHolder()
43     {}
44     
45     /* ---------------------------------------------------------------- */
46     public FilterHolder(HttpHandler httpHandler,
47                         String JavaDoc name,
48                         String JavaDoc className)
49     {
50         super(httpHandler,name,className);
51     }
52
53
54     
55
56     /* ------------------------------------------------------------ */
57     public void start()
58         throws Exception JavaDoc
59     {
60         super.start();
61         
62         if (!javax.servlet.Filter JavaDoc.class
63             .isAssignableFrom(_class))
64         {
65             super.stop();
66             throw new IllegalStateException JavaDoc(_class+" is not a javax.servlet.Filter");
67         }
68
69         _filter=(Filter JavaDoc)newInstance();
70         _config=new Config JavaDoc();
71         _filter.init(_config);
72     }
73
74     /* ------------------------------------------------------------ */
75     public void stop()
76     {
77         if (_filter!=null)
78             _filter.destroy();
79         _filter=null;
80         _config=null;
81         super.stop();
82     }
83     
84     /* ------------------------------------------------------------ */
85     public Filter JavaDoc getFilter()
86     {
87         return _filter;
88     }
89
90     /* ------------------------------------------------------------ */
91     public String JavaDoc toString()
92     {
93         return getName();
94     }
95     
96     /* ------------------------------------------------------------ */
97     /* ------------------------------------------------------------ */
98     /* ------------------------------------------------------------ */
99     class Config implements FilterConfig JavaDoc
100     {
101         /* ------------------------------------------------------------ */
102         public String JavaDoc getFilterName()
103         {
104             return FilterHolder.this.getName();
105         }
106
107         /* ------------------------------------------------------------ */
108         public ServletContext JavaDoc getServletContext()
109         {
110             return ((WebApplicationHandler)_httpHandler).getServletContext();
111         }
112         
113         /* -------------------------------------------------------- */
114         public String JavaDoc getInitParameter(String JavaDoc param)
115         {
116             return FilterHolder.this.getInitParameter(param);
117         }
118     
119         /* -------------------------------------------------------- */
120         public Enumeration JavaDoc getInitParameterNames()
121         {
122             return FilterHolder.this.getInitParameterNames();
123         }
124     }
125     
126 }
127
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