[GROOVY-10028] Add support for type conversion from Stream to array/collection/list/set

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0.0-beta-1
• Component/s: groovy-jdk
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 10/Apr/21 15:25
• Updated: 03/Feb/22 22:34
• Resolved: 15/Apr/21 05:39

Description

Consider the following:

void test(source) {
  Number[] array = source
  println array.class
  println array

  Collection coll = source
  println coll.class
  println coll

  List list = source
  println list.class
  println list

  Set set = source
  println set.class
  println set
}

test(new int[] {1,2,3})
test(Arrays.asList(1,2,3))
test(Arrays.stream(1,2,3))

Groovy supports automatic/implicit conversion from array to array/collection/list/set. And similarly for list to array or set (a list is already a collection/iterable). Can the type conversion logic be extended to support java.util.stream.Stream as a source for array/collection/list/set to eliminate the need for ".toArray()", ".toList()", ".toSet()" and ".collect(...)" in common situations?