From 488ab8ac3623b1f5b60cb9b436d0b86d3ac39d44 Mon Sep 17 00:00:00 2001
From: Googler <noreply@google.com>
Date: Thu, 9 Mar 2023 08:04:52 -0800
Subject: [PATCH] Delete unused utility `BigIntegerFingerprintUtils`.

PiperOrigin-RevId: 515337486
Change-Id: Ia5621b1f8302486ac059876118f38f8f6fcebdab
---
 .../com/google/devtools/build/lib/util/BUILD  |  1 -
 .../lib/util/BigIntegerFingerprintUtils.java  | 58 -------------------
 2 files changed, 59 deletions(-)
 delete mode 100644 src/main/java/com/google/devtools/build/lib/util/BigIntegerFingerprintUtils.java

diff --git a/src/main/java/com/google/devtools/build/lib/util/BUILD b/src/main/java/com/google/devtools/build/lib/util/BUILD
index dd376b5fc01804..807bba303ef869 100644
--- a/src/main/java/com/google/devtools/build/lib/util/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/util/BUILD
@@ -158,7 +158,6 @@ java_library(
     srcs = [
         "AbstractIndexer.java",
         "AnsiStrippingOutputStream.java",
-        "BigIntegerFingerprintUtils.java",
         "CPU.java",
         "CanonicalStringIndexer.java",
         "ClassName.java",
diff --git a/src/main/java/com/google/devtools/build/lib/util/BigIntegerFingerprintUtils.java b/src/main/java/com/google/devtools/build/lib/util/BigIntegerFingerprintUtils.java
deleted file mode 100644
index 3fffe02ab33af6..00000000000000
--- a/src/main/java/com/google/devtools/build/lib/util/BigIntegerFingerprintUtils.java
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2018 The Bazel Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//    http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.devtools.build.lib.util;
-
-import com.google.common.annotations.VisibleForTesting;
-import java.math.BigInteger;
-import javax.annotation.Nullable;
-
-/** Utility class for fingerprint composition. */
-public final class BigIntegerFingerprintUtils {
-  private static final int BITS = 128;
-  public static final int BYTES = BITS / 8;
-
-  private static final BigInteger UINT128_LIMIT = BigInteger.ONE.shiftLeft(BITS);
-  @VisibleForTesting public static final int RELATIVE_PRIME_INT = 31;
-  private static final BigInteger RELATIVE_PRIME = BigInteger.valueOf(RELATIVE_PRIME_INT);
-
-  private BigIntegerFingerprintUtils() {}
-
-  public static BigInteger compose(BigInteger v1, BigInteger v2) {
-    return v1.add(v2).mod(UINT128_LIMIT);
-  }
-
-  /**
-   * Unordered, nullable composition.
-   *
-   * <p>null is absorbing and is used to convey errors and unavailability
-   */
-  @Nullable
-  public static BigInteger composeNullable(@Nullable BigInteger v1, @Nullable BigInteger v2) {
-    if (v1 == null || v2 == null) {
-      return null;
-    }
-    return compose(v1, v2);
-  }
-
-  @Nullable
-  public static BigInteger composeOrderedNullable(
-      @Nullable BigInteger accumulator, @Nullable BigInteger v) {
-    if (accumulator == null || v == null) {
-      return null;
-    }
-    return compose(accumulator.multiply(RELATIVE_PRIME).mod(UINT128_LIMIT), v);
-  }
-
-}