From e0dea0c27ebd21ba2d0dd321182304c5543410ab Mon Sep 17 00:00:00 2001
From: Amnon Heiman <amnon@scylladb.com>
Date: Thu, 19 Nov 2015 11:52:17 +0200
Subject: [PATCH] EstimatedHistogram: Support empty histogram

When creating an estimated histogram from buckets it is a valid option
to get a zero size array as the buckets array.

In that case the newOffsets method would get a negative value for its
size, which should result in a zero length array of offsets.

Signed-off-by: Amnon Heiman <amnon@scylladb.com>
---
 .../java/com/cloudius/urchin/utils/EstimatedHistogram.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/com/cloudius/urchin/utils/EstimatedHistogram.java b/src/main/java/com/cloudius/urchin/utils/EstimatedHistogram.java
index 29bf21b..644e67b 100644
--- a/src/main/java/com/cloudius/urchin/utils/EstimatedHistogram.java
+++ b/src/main/java/com/cloudius/urchin/utils/EstimatedHistogram.java
@@ -74,6 +74,9 @@ public class EstimatedHistogram {
     }
 
     private static long[] newOffsets(int size) {
+        if (size <= 0) {
+            return new long[0];
+        }
         long[] result = new long[size];
         long last = 1;
         result[0] = last;