[WICKET-4719] Allow a list of a subclass of IColumn in DataTable constructor

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.0.0-beta3
• Fix Version/s: 6.0.0
• Component/s: wicket-extensions
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Jesse Long
• Created: 19/Aug/12 23:03
• Updated: 22/Aug/12 07:48
• Resolved: 22/Aug/12 07:48

Description

DataTable constructor requires List<IColumn<T, S>>. My T and S types are parameterized, with multiple parameters. This leads to a lot of typing.

List<IColumn<MyObject<T>, Descriptor<MyObject<T>, SomethingElse>>> columns = ....

I want to be able to subclass IColumn<T, S> calling MyColumn<T> with hiding all those type parameters, and take only one type parameter. Like:

class MyColumn<T> implements IColumn<MyObject<T>, Descriptor<MyObject<T>, SomethingElse>>{}

but I cannot pass a List<MyColumn<T>> to DataTable constructor. DataTable should take List<? extends IColumn<T, S>> instead of List<IColumn<T, S>>