algairim commented on a change in pull request #1297:
URL: https://github.com/apache/brooklyn-server/pull/1297#discussion_r800511537



##########
File path: 
utils/common/src/main/java/org/apache/brooklyn/util/collections/CollectionFunctionals.java
##########
@@ -119,6 +115,35 @@ public T apply(Iterable<? extends T> input) {
         @Override public String toString() { return "firstElementFunction"; }
     }
 
+    public static class AllEqualsFunction implements Function<Iterable<?>, 
Comparable<?>> {
+        private final Comparable<?> value;
+
+        public AllEqualsFunction(Comparable<?> value) {
+            if (Objects.isNull(value)) {
+                throw new IllegalArgumentException("The value to compare all 
to must be defined");
+            }
+            this.value = value;
+        }
+
+        @Override
+        public Boolean apply(@Nullable Iterable<?> input) {
+            if (Objects.isNull(input) || Iterables.isEmpty(input)) return null;

Review comment:
       This should address your doubt @jcabrerizo 




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