[vips7L]

Do you really want to inherit all the functions of Collection? Isn't this the anti-pattern everyone complains about on inheritance vs composition? This just looks like it's confused about whether it is a collection or has a collection.

Personally, I'd just rather take a collection by composition and only expose the small part of the API I actually want.

I guess though this is the standard decorator pattern you'd normally see from GoF.

[dcow]

It also breaks LSP when you “extend but reduce”. Not saying there aren't uses for “have-a”. More that writing a decorator in Java is awful.