On Sun, Jun 9, 2024 at 10:29 PM Gary Gregory <garydgreg...@gmail.com> wrote:
>
> Please do ;-)
Groovy provides Tuple0 through Tuple16 all of which extend Tuple which
implements List.
Tuple2 acts like Pair (more accurately ImmutablePair). Tuple2
implements Serializable and Comparable (like Pair) but not (currently)
Map.Entry. The following are more or less equivalent:
Pair<String, String> pair1 = Pair.of("foo", "bar");
// commons-lang
Tuple2<String, String> pair2 = Tuple.tuple("foo", "bar"); // groovy-core
Tuple<String> pair3 = new Tuple<>("foo", "bar"); //
groovy-core
Tuple3 acts like Triple (actually ImmutableTriple). Both implementing
Serializable and Comparable. Examples:
Triple<String, String, String> triple1 = Triple.of("foo", "bar",
"baz"); // commons-lang
Tuple3<String, String, String> triple2 = Tuple.tuple("foo", "bar",
"baz"); // groovy-core
The static factory method is "tuple" instead of "of". The accessors
are getV1(), getV2() etc. instead of getLeft(), getRight().
The classes are all written in Java and make no calls back into the
Groovy runtime - folks could extract the classes if they really
wanted.
The class hierarchy might seem a little strange for Java folks, e.g.
For Tuple<String, Integer>, calling parent methods from Tuple is
actually typed as (Tuple<Object>), e.g. get, subList, subTuple will
return results of type Object, List<Object>, Tuple<Object>
respectively. This would typically be transparent when used from
Groovy in dynamic mode but you might have to be aware of that when
using static Groovy or Java.
The fact that the classes extend List, means that 100+ Groovy List
extension methods work on Tuples, e.g:
System.out.println(DefaultGroovyMethods.intersect((Iterable<String>)pair2,
triple2)); // Java
assert pair2.intersect(triple2) == pair2 // Groovy
In Groovy, Tuples pop up in various places, e.g. there is special
support in Groovy for records (and emulated records) to return typed
tuples, e.g. for JDK8+:
@RecordOptions(components=true)
record Person(String name, Integer age) { }
var mary = new Person("Mary", 25)
Tuple2<String, Integer> nameAndAge = mary.components()
HTH,
Paul.
> Gary
>
> On Sun, Jun 9, 2024, 7:38 AM Paul King <paul.king.as...@gmail.com> wrote:
>
> > May or may not interest you but the Apache Groovy project has Tuple0
> > through to Tuple16. They are especially useful from the Groovy
> > programming language but are also useful from Java. I can elaborate if
> > it's of interest.
> >
> > Cheers, Paul.
> >
> > On Fri, Jun 7, 2024 at 11:41 PM Gary Gregory <garydgreg...@gmail.com>
> > wrote:
> > >
> > > Hello Michał.
> > >
> > > Nope ;-)
> > >
> > > Though, PRs are welcome! However, it might be best to detail your
> > > proposal here before spending time on something that might not attract
> > > interest.
> > >
> > > Gary
> > >
> > > On Fri, Jun 7, 2024 at 9:28 AM Michal Brach
> > > <mbr...@softsystem.pl.invalid> wrote:
> > > >
> > > > Hi,
> > > >
> > > > do you have any plans to provide new items in
> > org.apache.commons.lang3.tuple e.g. Quartet
> > > >
> > > > Thanks in advance.
> > > >
> > > >
> > > >
> > > >
> > > > Michał Brach
> > > > SoftSystem | Gene Dev 2
> > > > Ext 7317
> > > > ________________________________
> > > >
> > > > Ta wiadomość pocztowa i wszelkie załączone do niej pliki są poufne i
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> > niezwłocznie powiadomienie nadawcy i usunięcie otrzymanych informacji.
> > > >
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