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