RequestDecoratorMapper


1   /*
2    * This file is nearly identical to the SessionDecoratorMapper available in the
3    * SiteMesh CVS and written by Ricardo Lecheta. It has been kept out of the
4    * SiteMesh package to point out that this file is not part of the current
5    * SiteMesh official release.
6    */
7   package org.meshcms.core;
8   
9   import java.util.*;
10  import javax.servlet.http.*;
11  import com.opensymphony.module.sitemesh.*;
12  import com.opensymphony.module.sitemesh.mapper.*;
13  
14  /**
15   * <p>Will look at a request attribute to find the name of an appropriate decorator to use. If the
16   * request attribute is not present, the mapper will not do anything and allow the next mapper in the chain
17   * to select a decorator.</p>
18   * 
19   * <p>By default, it will look at the 'decorator' session attribute, however this can be overriden by
20   * configuring the mapper with a 'decorator.parameter' property.</p>
21   *
22   * @author Ricardo Lecheta
23   */
24  public class RequestDecoratorMapper extends AbstractDecoratorMapper {
25    private String   decoratorParameter = null;
26  
27    public void init(Config config, Properties properties, DecoratorMapper parent) throws InstantiationException   {
28      super.init(config, properties, parent);
29      decoratorParameter = properties.getProperty("decorator.parameter", "decorator");
30    }
31  
32    public Decorator getDecorator(HttpServletRequest request, Page page) {
33      Decorator result = null;
34      String   decorator = (String  ) request.getAttribute(decoratorParameter);
35  
36      if (decorator != null) {
37        result = getNamedDecorator(request, decorator);
38      }
39          
40      return result == null ? super.getDecorator(request, page) : result;
41    }
42  }
43

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