From ba90aa40f14bb0be998b3a6708cd2294ddb62b0e Mon Sep 17 00:00:00 2001
From: Dou Mok <douming.mok@gmail.com>
Date: Wed, 13 Nov 2024 13:55:46 -0800
Subject: [PATCH] Add null check for hexDigests in 'storeHardLink' method for
 'FileHashStoreLinks' to be safe

---
 .../dataone/hashstore/hashstoreconverter/FileHashStoreLinks.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/java/org/dataone/hashstore/hashstoreconverter/FileHashStoreLinks.java b/src/main/java/org/dataone/hashstore/hashstoreconverter/FileHashStoreLinks.java
index ff89c815..977245f0 100644
--- a/src/main/java/org/dataone/hashstore/hashstoreconverter/FileHashStoreLinks.java
+++ b/src/main/java/org/dataone/hashstore/hashstoreconverter/FileHashStoreLinks.java
@@ -94,6 +94,7 @@ public ObjectMetadata storeHardLink(
 
         try (InputStream fileStream = Files.newInputStream(filePath)) {
             Map<String, String> hexDigests = generateChecksums(fileStream, checksumAlgorithm);
+            FileHashStoreUtility.ensureNotNull(hexDigests, "hexDigests");
             String checksumToMatch = hexDigests.get(checksumAlgorithm);
             if (!checksum.equalsIgnoreCase(checksumToMatch)) {
                 String errMsg = "Checksum supplied: " + checksum + " does not match what has been"