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


1 /*
2  * Title: InlineDecoratorMapper
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.Decorator;
13 import com.opensymphony.module.sitemesh.Page;
14 import com.opensymphony.module.sitemesh.RequestConstants;
15 import com.opensymphony.module.sitemesh.factory.FactoryException;
16
17 import javax.servlet.http.HttpServletRequest JavaDoc;
18
19 /**
20  * The InlineDecoratorMapper is used to determine the correct Decorator when
21  * using inline decorators.
22  *
23  * <p>It will check the request attribute value defined by the key
24  * {@link com.opensymphony.module.sitemesh.RequestConstants#DECORATOR} and use the appropriate named
25  * Decorator. This is passed across from the page:applyDecorator tag.</p>
26  *
27  * @author <a HREF="mailto:joe@truemesh.com">Joe Walnes</a>
28  * @version $Revision: 1.2 $
29  *
30  * @see com.opensymphony.module.sitemesh.DecoratorMapper
31  */
32 public class InlineDecoratorMapper extends AbstractDecoratorMapper implements RequestConstants {
33     public Decorator getDecorator(HttpServletRequest JavaDoc request, Page page) {
34         Decorator result = null;
35         if (request.getAttribute(DECORATOR) != null) {
36             // Retrieve name of decorator to use from request
37 String JavaDoc decoratorName = (String JavaDoc)request.getAttribute(DECORATOR);
38             result = getNamedDecorator(request, decoratorName);
39             if (result == null) throw new FactoryException("Cannot locate inline Decorator: " + decoratorName);
40         }
41         return result == null ? super.getDecorator(request, page) : result;
42     }
43 }
44
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