Hi guys, here is my big problem today.
I have a list the items of two kinds (with and without icons) which gets
turned into a list of lists.
[x , x, y, x,y, y, y, y,x, x,y] becomes [[x,x],[y],[x],[y,y,y,y],[x],[y]]
When I render the list of lists in my JSP, I need to understand which
kind of list it is I am dealing with.
That's when I had a brilliant idea. I defined to subclasses of ArrayList:
public class LinkWithIconList extends ArrayList {
public boolean isLinkWithIconList() {
return true;
}
public boolean isLinkWithoutIconList() {
return false;
}
}
(you can probably guess what the other class looks like :). And each
sublist is an object of the respective subclasses.
The rationale was to be able to do something like:
<c:forEach var="sub_list" items="${list_of_lists}">
<c:choose>
<c:when test="${sub_list.linkWithIconList}">
render list with icons
</c:when>
<c:when test="${sub_list.linkWithoutIconList}">
render list without icons
</c:when>
</c:choose>
</c:forEach>
Unfortunately this doesn't work. ${sub_list.linkWithIconList} is
interpreted as an attempt to access to an item of the collection (and
not one of its properties):
javax.servlet.ServletException: The "." operator was supplied with
an index value of type "java.lang.String" to be
applied to a List or array, but that value cannot be converted to an integer.
So, the question for this respactable forum is:
- is there an easy way to achieve what I am trying to achieve?
- are there other ways to achieve my goals?
Thanks
Luca
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