> @@ -46,6 +46,21 @@ public String toString() {
>           }
>        };
>     }
> +   
> +   public static <K, V> Supplier<V> getValueInMapOrNull(final 
> Supplier<Map<K, Supplier<V>>> input, final K keyValue) {
> +      return new Supplier<V>() {
> +         @Override
> +         public V get() {
> +            Map<K, Supplier<V>> map = input.get();
> +            return map.containsKey(keyValue) ? map.get(keyValue).get() : 
> null;
> +         }
> +
> +         @Override
> +         public String toString() {
> +            return String.format("getValueInMapOrNull('%1$s')", keyValue);
> +         }

If that's a convention we're using elsewhere (i.e. to have a `toString`), fine 
with me and a lesson learned on my side ;-) Thanks!

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