DfsGarbageCollector: #setReflogExpire with Instant instead of Date

The Date API is full of major design flaws and pitfalls and should be
avoided at all costs. Prefer the java.time APIs, specifically,
java.time.Instant (for physical time) and java.time.LocalDate[Time]
(for civil time). [1]

Replace the Date with Instant in the
DfsGarbageCollector#setReflogExpire method.

[1] https://errorprone.info/bugpattern/JavaUtilDate

Change-Id: Ie98e426e63621e8bef96c31bca56aec0c8eef5a6

2 files changed, 8 insertions, 6 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
index 3edd1056be..f9fbfe8db0 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
@@ -16,6 +16,7 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.IOException;
+import java.time.Instant;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Date;
@@ -1331,7 +1332,7 @@ public class DfsGarbageCollectorTest {
 		gc = new DfsGarbageCollector(repo);
 		gc.setReftableConfig(new ReftableConfig());
 		// Expire ref log entries older than 30 days
-		gc.setRefLogExpire(new Date(thirty_days_ago));
+		gc.setRefLogExpire(Instant.ofEpochMilli(thirty_days_ago));
 		run(gc);
 
 		// Single GC pack present with all objects.
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollector.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollector.java
index 6861fe8099..e6068a15ec 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollector.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollector.java
@@ -24,11 +24,11 @@ import static org.eclipse.jgit.internal.storage.pack.PackExt.REFTABLE;
 import static org.eclipse.jgit.internal.storage.pack.PackWriter.NONE;
 
 import java.io.IOException;
+import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Collection;
-import java.util.Date;
 import java.util.EnumSet;
 import java.util.GregorianCalendar;
 import java.util.HashSet;
@@ -100,7 +100,7 @@ public class DfsGarbageCollector {
 	private Set<ObjectId> allTags;
 	private Set<ObjectId> nonHeads;
 	private Set<ObjectId> tagTargets;
-	private Date refLogExpire;
+	private Instant refLogExpire;
 
 	/**
 	 * Initialize a garbage collector.
@@ -212,8 +212,8 @@ public class DfsGarbageCollector {
 	 *            instant in time which defines refLog expiration
 	 * @return {@code this}
 	 */
-	public DfsGarbageCollector setRefLogExpire(Date refLogExpire) {
-		this.refLogExpire = refLogExpire ;
+	public DfsGarbageCollector setRefLogExpire(Instant refLogExpire) {
+		this.refLogExpire = refLogExpire;
 		return this;
 	}
 
@@ -752,7 +752,8 @@ public class DfsGarbageCollector {
 			compact.setIncludeDeletes(includeDeletes);
 			compact.setConfig(configureReftable(reftableConfig, out));
 			if(refLogExpire != null ){
-				compact.setReflogExpireOldestReflogTimeMillis(refLogExpire.getTime());
+				compact.setReflogExpireOldestReflogTimeMillis(
+						refLogExpire.toEpochMilli());
 			}
 			compact.compact();
 			pack.addFileExt(REFTABLE);