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added collection.toSortedSet() for easier conversion to sorted setsand collection.notNull() so its easy to treat a nullable collection/list as a collection

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James Strachan
2012-02-23 18:10:53 +00:00
parent 80e728b6f6
commit cb7d23c420
3 changed files with 15 additions and 1 deletions
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stdlib/ktSrc/JavaIterables.kt
+6
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@@ -141,18 +141,24 @@ inline fun <T> java.lang.Iterable<T>.reverse() : List<T> {
return answer
}
/* Copies the collection into the given collection */
inline fun <T, C: Collection<T>> java.lang.Iterable<T>.to(result: C) : C {
for (elem in this)
result.add(elem)
return result
}
/* Converts the collection into a LinkedList */
inline fun <T> java.lang.Iterable<T>.toLinkedList() : LinkedList<T> = this.to(LinkedList<T>())
/* Converts the collection into a List */
inline fun <T> java.lang.Iterable<T>.toList() : List<T> = this.to(ArrayList<T>())
/* Converts the collection into a Set */
inline fun <T> java.lang.Iterable<T>.toSet() : Set<T> = this.to(HashSet<T>())
/* Converts the collection into a SortedSet */
inline fun <T> java.lang.Iterable<T>.toSortedSet() : SortedSet<T> = this.to(TreeSet<T>())
/**
TODO figure out necessary variance/generics ninja stuff... :)
inline fun <in T> java.lang.Iterable<T>.toSortedList(transform: fun(T) : java.lang.Comparable<*>) : List<T> {