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Java > Open Source Codes > org > apache > turbine > pipeline > DetermineActionValve


1 package org.apache.turbine.pipeline;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation" and
29  * "Apache Turbine" must not be used to endorse or promote products
30  * derived from this software without prior written permission. For
31  * written permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache",
34  * "Apache Turbine", nor may "Apache" appear in their name, without
35  * prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
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50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  */
56
57 import java.io.IOException JavaDoc;
58 import org.apache.turbine.TurbineConstants;
59 import org.apache.turbine.RunData;
60 import org.apache.turbine.TurbineException;
61 import org.apache.turbine.ValveContext;
62 import org.apache.commons.logging.Log;
63 import org.apache.commons.logging.LogFactory;
64
65 /**
66  * This valve is responsible for setting the 'action' property of RunData based
67  * on request parameter. There is no default action, since a null action is
68  * perfectly valid.
69  *
70  * @author <a HREF="mailto:james@jamestaylor.org">James Taylor</a>
71  */
72 public class DetermineActionValve
73     extends AbstractValve
74 {
75     private static final Log log
76         = LogFactory.getLog( DetermineActionValve.class );
77         
78     /**
79      * @see org.apache.turbine.Valve#invoke(RunData, ValveContext)
80      */
81     public void invoke( RunData data, ValveContext context )
82         throws IOException JavaDoc, TurbineException
83     {
84         if ( ! data.hasAction() )
85         {
86             String JavaDoc action =
87                 data.getParameters().getString( TurbineConstants.ACTION );
88
89             if ( action != null )
90             {
91                 data.setAction( action );
92                 
93                 log.debug( "Set action from request parameter" );
94             }
95             else
96             {
97                 log.debug( "No action" );
98             }
99         }
100         
101         if ( log.isDebugEnabled() )
102         {
103             log.debug( "Action is now: " + data.getAction() );
104         }
105
106         // Pass control to the next Valve in the Pipeline
107 context.invokeNext( data );
108     }
109 }
110
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