Rephrase Fingerprint in terms of guava HashFunction.

This minimizes API divergence and allows us to make use of performance enhancements in guava, such as https://github.com/google/guava/issues/1197.

--
MOS_MIGRATED_REVID=127108107

1 files changed, 2 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/actions/cache/Digest.java b/src/main/java/com/google/devtools/build/lib/actions/cache/Digest.java
index c5653ac8fa..06989198d2 100644
--- a/src/main/java/com/google/devtools/build/lib/actions/cache/Digest.java
+++ b/src/main/java/com/google/devtools/build/lib/actions/cache/Digest.java
@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.actions.cache;
 
+import com.google.common.hash.HashCode;
 import com.google.devtools.build.lib.util.Fingerprint;
 import com.google.devtools.build.lib.util.VarInt;
 
@@ -107,7 +108,7 @@ public class Digest {
 
   @Override
   public String toString() {
-    return Fingerprint.hexDigest(digest);
+    return HashCode.fromBytes(digest).toString();
   }
 
   private static byte[] getDigest(Fingerprint fp, String execPath, Metadata md) {