From 7a29febd721b74c58cb480c601f3c3660841b200 Mon Sep 17 00:00:00 2001
From: Jason Tedor <jason@tedor.me>
Date: Tue, 15 Sep 2015 10:07:15 -0400
Subject: [PATCH] Remove and forbid use of com.google.common.math.LongMath

This commit removes and now forbids all uses of
com.google.common.math.LongMath across the codebase. This is one step
of many in the eventual removal of Guava as a dependency.
---
 .../org/elasticsearch/common/util/BloomFilter.java     | 10 +++++++---
 .../src/main/resources/forbidden/all-signatures.txt    |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/core/src/main/java/org/elasticsearch/common/util/BloomFilter.java b/core/src/main/java/org/elasticsearch/common/util/BloomFilter.java
index 8a2acba8d28..0f72d6d62b1 100644
--- a/core/src/main/java/org/elasticsearch/common/util/BloomFilter.java
+++ b/core/src/main/java/org/elasticsearch/common/util/BloomFilter.java
@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.common.util;
 
-import com.google.common.math.LongMath;
 import com.google.common.primitives.Ints;
 import org.apache.lucene.store.DataInput;
 import org.apache.lucene.store.DataOutput;
@@ -33,7 +32,6 @@ import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.unit.SizeValue;
 
 import java.io.IOException;
-import java.math.RoundingMode;
 import java.util.Arrays;
 import java.util.Comparator;
 
@@ -321,7 +319,13 @@ public class BloomFilter {
         long bitCount;
 
         BitArray(long bits) {
-            this(new long[Ints.checkedCast(LongMath.divide(bits, 64, RoundingMode.CEILING))]);
+            this(new long[size(bits)]);
+        }
+
+        private static int size(long bits) {
+            long quotient = bits / 64;
+            long remainder = bits - quotient * 64;
+            return Ints.checkedCast(remainder == 0 ? quotient : 1 + quotient);
         }
 
         // Used by serialization
diff --git a/dev-tools/src/main/resources/forbidden/all-signatures.txt b/dev-tools/src/main/resources/forbidden/all-signatures.txt
index c79dc5c7d26..c133fd51004 100644
--- a/dev-tools/src/main/resources/forbidden/all-signatures.txt
+++ b/dev-tools/src/main/resources/forbidden/all-signatures.txt
@@ -119,6 +119,7 @@ com.google.common.collect.UnmodifiableIterator
 com.google.common.collect.ObjectArrays
 com.google.common.collect.Multimap
 com.google.common.collect.MultimapBuilder
+com.google.common.math.LongMath
 
 @defaultMessage Do not violate java's access system
 java.lang.reflect.AccessibleObject#setAccessible(boolean)