Could we also have TypedMap and TypedSet?
The way I did this was:
TypedStructure interface. AbstractTypedStructure class.
IllegalTypeException exception.
Then TypedSet/List/Map implement Set/List/Map and extend
AbstractTypedStructure.
I can supply my source if you want, but as it's something I've not found
useful that often I'm guessing yours is quite a lot better.
What is the point of the wrap method?
Can I do:
List list = TypedList(new LinkedList()); ????
Hen
On Tue, 23 Apr 2002, James Strachan wrote:
> +1
>
> this seems a good idea.
>
> James
> ----- Original Message -----
> From: "Jack, Paul" <[EMAIL PROTECTED]>
> To: "'Jakarta Commons Developers List'" <[EMAIL PROTECTED]>
> Sent: Tuesday, April 23, 2002 4:14 PM
> Subject: RE: [Collections][SUBMIT] TypedList
>
>
> > Hi Steve,
> >
> > Your TypedList got me thinking...At first I thought, wouldn't
> > it be nice to specify a parameter that would allow the null
> > element (sometimes I need a list that allows nulls)...then I
> > got to thinking, actually wouldn't it be nice if the validate()
> > method could be overridden by a subclass to allow more than one
> > class type...then I thought, actually, wouldn't it be nice if
> > the validation were completely generic, so that you supplied the
> > validation routine in the constructor of the list...then I
> > realized, the collections package already defines an interface
> > for validations (Predicate)...
> >
> > So...do you think it's a good idea to alter TypedList so that it
> > takes a Predicate in its constructor? You could then supply a
> > concrete Predicate that does the Class.isInstance check...
> >
> > -Paul
> >
> > -----Original Message-----
> > From: Stephen Colebourne [mailto:[EMAIL PROTECTED]]
> > Sent: Sunday, April 21, 2002 2:13 PM
> > To: Jakarta Commons Developers List
> > Subject: [Collections][SUBMIT] TypedList
> >
> >
> > Hi,
> > After a quick check, I could find no implementation of a type checking
> list
> > in collections. As I needed it, I have created one. Here is the class
> > javadoc:
> > * TypedList is a list wrapper that supports type checking. Only elements
> > * of the specified type (or a subclass) can be added to the list. An
> > * attempt to add a different kind of object, or null, will cause an
> > * <tt>IllegalArgumentException</tt>.
> > * <p>
> > * Constructing a new instance of this class will use an ArrayList behind
> > * the scenes. Alternatively, the static <tt>wrap</tt> method can be
> > * used to wrap any object implementing List.
> >
> > The code is attached as a zip. Feedback welcome on whether this is
> suitable
> > for inclusion in the collections area.
> >
> > Stephen
> >
> > --
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>
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