KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > catalina > core > StandardEngineValve


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18
19 package org.apache.catalina.core;
20
21
22 import java.io.IOException JavaDoc;
23
24 import javax.servlet.ServletException JavaDoc;
25 import javax.servlet.http.HttpServletResponse JavaDoc;
26
27 import org.apache.catalina.CometEvent;
28 import org.apache.catalina.Host;
29 import org.apache.catalina.connector.Request;
30 import org.apache.catalina.connector.Response;
31 import org.apache.catalina.util.StringManager;
32 import org.apache.catalina.valves.ValveBase;
33
34
35 /**
36  * Valve that implements the default basic behavior for the
37  * <code>StandardEngine</code> container implementation.
38  * <p>
39  * <b>USAGE CONSTRAINT</b>: This implementation is likely to be useful only
40  * when processing HTTP requests.
41  *
42  * @author Craig R. McClanahan
43  * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
44  */
45
46 final class StandardEngineValve
47     extends ValveBase {
48
49
50     // ----------------------------------------------------- Instance Variables
51
52
53     /**
54      * The descriptive information related to this implementation.
55      */
56     private static final String JavaDoc info =
57         "org.apache.catalina.core.StandardEngineValve/1.0";
58
59
60     /**
61      * The string manager for this package.
62      */
63     private static final StringManager sm =
64         StringManager.getManager(Constants.Package);
65
66
67     // ------------------------------------------------------------- Properties
68
69
70     /**
71      * Return descriptive information about this Valve implementation.
72      */
73     public String JavaDoc getInfo() {
74
75         return (info);
76
77     }
78
79
80     // --------------------------------------------------------- Public Methods
81
82
83     /**
84      * Select the appropriate child Host to process this request,
85      * based on the requested server name. If no matching Host can
86      * be found, return an appropriate HTTP error.
87      *
88      * @param request Request to be processed
89      * @param response Response to be produced
90      * @param valveContext Valve context used to forward to the next Valve
91      *
92      * @exception IOException if an input/output error occurred
93      * @exception ServletException if a servlet error occurred
94      */
95     public final void invoke(Request request, Response JavaDoc response)
96         throws IOException JavaDoc, ServletException JavaDoc {
97
98         // Select the Host to be used for this Request
99 Host host = request.getHost();
100         if (host == null) {
101             response.sendError
102                 (HttpServletResponse.SC_BAD_REQUEST,
103                  sm.getString("standardEngine.noHost",
104                               request.getServerName()));
105             return;
106         }
107
108         // Ask this Host to process this request
109 host.getPipeline().getFirst().invoke(request, response);
110
111     }
112
113
114     /**
115      * Process Comet event.
116      *
117      * @param request Request to be processed
118      * @param response Response to be produced
119      * @param valveContext Valve context used to forward to the next Valve
120      *
121      * @exception IOException if an input/output error occurred
122      * @exception ServletException if a servlet error occurred
123      */
124     public final void event(Request request, Response JavaDoc response, CometEvent event)
125         throws IOException JavaDoc, ServletException JavaDoc {
126
127         // Ask this Host to process this request
128 request.getHost().getPipeline().getFirst().event(request, response, event);
129
130     }
131
132 }
133
Popular Tags