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commented
9 years ago Hey koppernickus,
This was already discussed in the google-collections issues / group, but your
question is legitimate since there is no mention of it in the guava project's
issues / group ;)
Guava does not provide such a method, because the filtered List view would have
very poor performance.
They could have Lists.filter() return a filtered *copy* instead, but:
- it would be counter-intuitive, since the similarly named
Collections2.filter() and Iterables.filter() both returns *views* instead of
copies
- there is the problem of the choice of the List implementation to return:
should we return an ArrayList? an ImmutableList? a LinkedList?
For these reasons, it is preferable to let the developer do the copy himself:
ImmutableList.copyOf(Iterables.filter(*))
Lists.newArrayList(Iterables.filter(*))
...
If you really want the syntactical sugar, and you know which implementation
type you want to use in your project, you could create a static utility method
that hides this boilerplate.
More info:
http://code.google.com/p/google-collections/issues/detail?id=7#c2
http://code.google.com/p/google-collections/issues/detail?id=98#c1
http://groups.google.com/group/google-collections-users/browse_thread/thread/2f0
120513488977e
http://groups.google.com/group/google-collections-users/browse_thread/thread/5ad
e208a52ee3973
http://groups.google.com/group/google-collections-users/msg/fac903c3a542d77fOriginal comment by nev...@gmail.com on 30 Dec 2010 at 11:45
Original issue reported on code.google.com by
kopperni...@gmail.comon 27 Dec 2010 at 7:51