+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 > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
