dekelpilli commented on a change in pull request #357: Proposal for LANG-1421
URL: https://github.com/apache/commons-lang/pull/357#discussion_r259612512
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File path: src/main/java/org/apache/commons/lang3/ObjectUtils.java
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@@ -275,6 +315,45 @@ public static boolean allNotNull(final Object... values) {
return true;
}
+ /**
+ * Checks if all values in the array are {@code nulls}.
+ *
+ * <p>
+ * If any value is not {@code null}, the array is {@code null} or the
array is empty (contains no elements) then
+ * {@code false} is returned. If all elements in array are {@code null}
{@code true} is returned.
+ * </p>
+ *
+ * <pre>
+ * ObjectUtils.allNull(*) = false
+ * ObjectUtils.allNull(*, *) = false
+ * ObjectUtils.allNull(null) = true
+ * ObjectUtils.allNull(null, null) = true
+ * ObjectUtils.allNull(null, *) = false
+ * ObjectUtils.allNull(*, null) = false
+ * ObjectUtils.allNull(*, *, null, *) = false
+ * ObjectUtils.allNull() = false
+ * ObjectUtils.allNull((Object[]) null) = false
+ * </pre>
+ *
+ * @param values the values to test, may be {@code null} or empty
+ * @return {@code false} if there is at least one non {@code null} value
in the array, the array is {@code null}
+ * or array contains no elements, {@code true} if all values in the array
are {@code null}s .
+ * @since 3.9
+ */
+ public static boolean allNull(final Object... values) {
+ if (values == null || values.length == 0) {
+ return false;
+ }
+
+ for (final Object val : values) {
Review comment:
This can be replaced by `return firstNonNull(values) == null`, although then
you're doubling up on the null check.
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