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implicits for java.util.<Collection type here> ?
Mon, 2009-01-12, 22:45
Hi list,
is there a set of implicit conversions from the java.util. types to the equivalents in scala? I was stumbling over uses of
java.util.Enumeration and java.util.List; more problems are probably
lurking around the next corner. Now I can define a conversion of
java.util.Enumeration to Iterator; but I can't convert from
java.util.List to List (the latter is sealed), so what I do now is:
object JavaAdaptor {
implicit def enumToIterator[A](enum: java.util.Enumeration[A]) :
Iterator[A] = new Iterator[A] {
def hasNext = enum.hasMoreElements
def next = enum.nextElement
}
implicit def listToSeq[A](lst: java.util.List[A]) : Seq[A] = new Seq[A] {
override val length = lst.size
override def elements = new Iterator[A] {
private val _iter = lst.iterator()
override def hasNext = _iter.hasNext()
override def next = _iter.next()
}
override def apply(idx : Int) = lst.get(idx)
}
}
But I assume this is going to happen more often than seldomly (and
gmane had some things to say for java.util.X but not about implicit
conversions or I missed it..), so are these (or equivalents) and
friends somewhere in the scala library?
Thanks in advance,
-Martin
Mon, 2009-01-12, 23:07
#2
Re: implicits for java.util.<Collection type here> ?
On Mon, Jan 12, 2009 at 9:44 PM, Martin S. Weber wrote:
> is there a set of implicit conversions from the java.util.
> types to the equivalents in scala?
As Blair said, take a look at scala.collection.jcl for the Java =>
Scala direction.
I'm working on bidirectional (but simplified relative to the existing
ones) conversions for scalax.collection._ for 2.8.0.
Cheers,
Miles
Mon, 2009-01-12, 23:17
#3
Re: implicits for java.util.<Collection type here> ?
I have a selection of conversions for Iterable and Enumeration at:
http://code.google.com/p/scala-scales/source/browse/trunk/scalesUtils/sr...
they manage to do most of the work for me.
On 1/12/09, Miles Sabin wrote:
> On Mon, Jan 12, 2009 at 9:44 PM, Martin S. Weber wrote:
> > is there a set of implicit conversions from the java.util.
> > types to the equivalents in scala?
>
>
> As Blair said, take a look at scala.collection.jcl for the Java =>
> Scala direction.
>
> I'm working on bidirectional (but simplified relative to the existing
> ones) conversions for scalax.collection._ for 2.8.0.
>
> Cheers,
>
>
> Miles
>
>
> --
> Miles Sabin
> tel: +44 (0)1273 720 779
> mobile: +44 (0)7813 944 528
> skype: milessabin
>
Mon, 2009-01-12, 23:37
#4
Re: implicits for java.util.<Collection type here> ?
Quoting "Blair Zajac" :
> Martin S. Weber wrote:
>> Hi list,
>>
>> is there a set of implicit conversions from the
>> java.util. types to the equivalents in scala? (...)
>
> Have you taken a look at
>
> http://www.scala-lang.org/docu/files/api/scala/collection/jcl/Conversions$object.html
> http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk/src/library/scala/col...
I did just now, thanks for the pointer.
collection.jcl.Conversions._ actually do what I need.
thanks!
-Martin
Martin S. Weber wrote:
> Hi list,
>
> is there a set of implicit conversions from the java.util.
> types to the equivalents in scala? I was stumbling over uses of
> java.util.Enumeration and java.util.List; more problems are probably
> lurking around the next corner. Now I can define a conversion of
> java.util.Enumeration to Iterator; but I can't convert from
> java.util.List to List (the latter is sealed), so what I do now is:
Have you taken a look at
http://www.scala-lang.org/docu/files/api/scala/collection/jcl/Conversions$object.html
http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk/src/library/scala/col...
Regards,
Blair