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Java > Open Source Codes > com > opensymphony > module > sitemesh > mapper > ConfigDecoratorMapper


1 /*
2  * Title: ConfigDecoratorMapper
3  * Description:
4  *
5  * This software is published under the terms of the OpenSymphony Software
6  * License version 1.1, of which a copy has been included with this
7  * distribution in the LICENSE.txt file.
8  */
9
10 package com.opensymphony.module.sitemesh.mapper;
11
12 import com.opensymphony.module.sitemesh.Config;
13 import com.opensymphony.module.sitemesh.Decorator;
14 import com.opensymphony.module.sitemesh.DecoratorMapper;
15 import com.opensymphony.module.sitemesh.Page;
16
17 import javax.servlet.ServletException JavaDoc;
18 import javax.servlet.http.HttpServletRequest JavaDoc;
19 import java.util.Properties JavaDoc;
20
21 /**
22  * Default implementation of DecoratorMapper. Reads decorators and
23  * mappings from the <code>config</code> property (default '/WEB-INF/decorators.xml').
24  *
25  * @author <a HREF="joe@truemesh.com">Joe Walnes</a>
26  * @author <a HREF="mcannon@internet.com">Mike Cannon-Brookes</a>
27  * @version $Revision: 1.1 $
28  *
29  * @see com.opensymphony.module.sitemesh.DecoratorMapper
30  * @see com.opensymphony.module.sitemesh.mapper.DefaultDecorator
31  * @see com.opensymphony.module.sitemesh.mapper.ConfigLoader
32  */
33 public class ConfigDecoratorMapper extends AbstractDecoratorMapper {
34     private ConfigLoader configLoader = null;
35
36     /** Create new ConfigLoader using '/WEB-INF/decorators.xml' file. */
37     public void init(Config config, Properties JavaDoc properties, DecoratorMapper parent) throws InstantiationException JavaDoc {
38         super.init(config, properties, parent);
39         try {
40             String JavaDoc fileName = properties.getProperty("config", "/WEB-INF/decorators.xml");
41             configLoader = new ConfigLoader(fileName, config);
42         }
43         catch (Exception JavaDoc e) {
44             throw new InstantiationException JavaDoc(e.toString());
45         }
46     }
47
48     /** Retrieve {@link com.opensymphony.module.sitemesh.Decorator} based on 'pattern' tag. */
49     public Decorator getDecorator(HttpServletRequest JavaDoc request, Page page) {
50         String JavaDoc thisPath = request.getServletPath();
51
52         // getServletPath() returns null unless the mapping corresponds to a servlet
53 if (thisPath == null) {
54             String JavaDoc requestURI = request.getRequestURI();
55             if (request.getPathInfo() != null) {
56                 // strip the pathInfo from the requestURI
57 thisPath = requestURI.substring(0, requestURI.indexOf(request.getPathInfo()));
58             }
59             else {
60                 thisPath = requestURI;
61             }
62         }
63
64         String JavaDoc name = null;
65         try {
66             name = configLoader.getMappedName(thisPath);
67         }
68         catch (ServletException JavaDoc e) {
69             e.printStackTrace();
70         }
71
72         Decorator result = getNamedDecorator(request, name);
73         return result == null ? super.getDecorator(request, page) : result;
74     }
75
76     /** Retrieve Decorator named in 'name' attribute. Checks the role if specified. */
77     public Decorator getNamedDecorator(HttpServletRequest JavaDoc request, String JavaDoc name) {
78         Decorator result = null;
79         try {
80             result = configLoader.getDecoratorByName(name);
81         }
82         catch (ServletException JavaDoc e) {
83             e.printStackTrace();
84         }
85
86         if (result == null || (result.getRole() != null && !request.isUserInRole(result.getRole()))) {
87             // if the result is null or the user is not in the role
88 return super.getNamedDecorator(request, name);
89         }
90         else {
91             return result;
92         }
93     }
94 }
95
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