Tiles - proper way for choosing a tile dynamically

[Janne Mattila]

I use Tiles to create pages that have their tiles selected dynamically based 
on some information that is created in an action. One simple example could 
be a menu tile, which is selected based on an attribute that is stored in 
session. I created simple definitions like:

	<definition name=".layout.basic-cd" 
path="/pages/cd/layout/basicTemplate.jsp">
		<put name="topleft" value="/pages/cd/content/common/topleft.jsp" />
		<put name="header" value="/pages/cd/content/common/logged-in-header.jsp" 
/>
		<put name="menu" value="/pages/cd/content/common/menu.jsp" />
		<put name="bottomleft" value="/pages/cd/content/common/bottomleft.jsp" />
		<put name="footer" value="/pages/cd/content/common/footer.jsp" />
	</definition>

   <definition name=".page.main" extends=".layout.basic-cd">
                <put name="content" value="/pages/cd/content/main.jsp"/>
   </definition>
  ...
then, in menu.jsp page I include either "admin" menu or "user" menu based on 
the session parameter:

<unstandard:bind var="AdminRole" type="cd.business.Role" field="ADMIN"/>
<unstandard:bind var="UserRole" type="cd.business.Role" field="USER"/>
<c:choose>
<c:when test="${sessionScope.role == AdminRole}">
 <tiles:insert page="menu-admin.jsp" />
</c:when>
<c:when test="${sessionScope.role == UserRole}">
 <tiles:insert page="menu-user.jsp" />
</c:when>
</c:choose>
Now the question: is this the "proper" way to do this, or is there a more 
elegant method?


PS. if those <unstandard:bind> tags confuse, they use jakarta unstandard 
taglib to enable JSTL to compare the object in session to typesafe 
enumeration values. In scriptlets this would be written simply as

<% if (cd.business.Role.ADMIN.equals(session.getAttribute("role")) { %>
 <tiles:insert page="menu-admin.jsp" />
...
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