Using variable in decorators

[Mauriff]

Hi all,
I want to use to a dynamic variable, such as ${template}, in my decorators.xml. Can I do it?
example:

<decorators defaultdir="/decorators">
<decorator name="default" page="${template}/default.jsp">
<pattern>/*</pattern>
</decorator>
</decorators>


Regards!

Mauri.

[Joe Walnes]

Hi Maurif

The decorators.xml configuration loader does not support variables. However you can extends SiteMesh by adding your own DecoratorMapper to the stack that will do the variable substitution.

Here is a really crude implementation - but enough to get the point over.

  public class MyVariableSubstitutingDecoratorMapper extends AbstractDecoratorMapper {
    public Decorator getNamedDecorator(HttpServletRequest request, String name) {
      Decorator decorator = super.getNamedDecorator(request, name));
      if (decorator.getPage().contains("${template}")) {
        // replace decorator with a new page location.
        String newPage = decorator.getPage().replace("${template}", "something");
        decorator new DefaultDecorator(original.getName(), newPage, new HashMap());
      }
      return decorator;
    }
  }

To get SiteMesh to use this, you need to add it to WEB-INF/sitemesh.xml. (If you do not have this file, you can extract it from sitemesh.jar, named sitemesh-default.xml, or grab it here: http://fisheye5.cenqua.com/browse/~raw,r=1.5/sitemesh/src/java/com/opensymphony/module/sitemesh/factory/sitemesh-default.xml).

It should be inserted just before the ConfigDecoratorMapper.

  <sitemesh>
    ...
    <decorator-mappers>
      ... the other mappers ...
      <mapper class="com.yourpackage.MyVariableSubstitutingDecoratorMapper"/>
      <mapper class="com.opensymphony.module.sitemesh.mapper.ConfigDecoratorMapper">
        ...
      </mapper>
    </decorator-mappers>
  </sitemesh>

Hope that helps.
-Joe

On Tue, May 12, 2009 at 3:16 PM, Mauriff <mauriff@...> wrote:

Hi all,
I want to use to a dynamic variable, such as ${template}, in my
decorators.xml. Can I do it?
example:

<decorators defaultdir="/decorators">
<decorator name="default" page="${template}/default.jsp">
<pattern>/*</pattern>
</decorator>
</decorators>


Regards!

Mauri.
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