| commit | 0737860a6cbc22fc8064b758f5f21938ec67e313 | [log] [tgz] |
|---|---|---|
| author | Stephan Wahlbrink <sw@wahlbrink.eu> | Mon Aug 16 21:41:37 2021 +0200 |
| committer | Stephan Wahlbrink <sw@wahlbrink.eu> | Mon Aug 16 21:41:57 2021 +0200 |
| tree | d181390d79ef7086f5fe3b7f18368a832dce52a6 | |
| parent | 73242f3a5f69beb9230f71f841764382206191a6 [diff] |
[Collections] Add ImCollections.addElementIfAbsent(IdentityList) Change-Id: I4c8f2f07b87011394805f136aaea04424a8cf2aa
diff --git a/jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/jcommons/collections/ImCollections.java b/jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/jcommons/collections/ImCollections.java index 5249621..f7b387f 100644 --- a/jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/jcommons/collections/ImCollections.java +++ b/jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/jcommons/collections/ImCollections.java
@@ -815,6 +815,18 @@ } } + public static <E> ImIdentityList<E> addElementIfAbsent(final IdentityList<? extends E> l, final E e) { + if (l.isEmpty()) { + return new ImSingletonIdentityList<>(e); + } + else if (!l.contains(e)) { + return addElement(l, e); + } + else { + return toIdentityList(l); + } + } + @SuppressWarnings("unchecked") public static <E> ImIdentityList<E> removeElement(final IdentityList<? extends E> l, final @Nullable Object e) {