print detailed information if incremental backup fail due to an IO exception.

1 files changed, 19 insertions, 1 deletions

diff --git a/src/main/java/com/keuin/kbackupfabric/operation/backup/feedback/IncrementalBackupFeedback.java b/src/main/java/com/keuin/kbackupfabric/operation/backup/feedback/IncrementalBackupFeedback.java
index bdd6d88..696ee02 100644
--- a/src/main/java/com/keuin/kbackupfabric/operation/backup/feedback/IncrementalBackupFeedback.java
+++ b/src/main/java/com/keuin/kbackupfabric/operation/backup/feedback/IncrementalBackupFeedback.java
@@ -3,13 +3,31 @@ package com.keuin.kbackupfabric.operation.backup.feedback;
 import com.keuin.kbackupfabric.backup.incremental.manager.IncCopyResult;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.Objects;
+
 public class IncrementalBackupFeedback implements BackupFeedback {
     private final boolean success;
     private final IncCopyResult copyResult;
+    // if the backup failed because of an exception, set this.
+    // Otherwise, this should be null.
+    private final Throwable throwable;
 
     public IncrementalBackupFeedback(boolean success, @Nullable IncCopyResult copyResult) {
         this.success = success;
         this.copyResult = copyResult;
+        this.throwable = null;
+    }
+
+    /**
+     * Create a failed backup feedback caused by an exception.
+     *
+     * @param t the exception.
+     */
+    public IncrementalBackupFeedback(Throwable t) {
+        Objects.requireNonNull(t);
+        this.success = false;
+        this.copyResult = null;
+        this.throwable = t;
     }
 
     @Override
@@ -26,6 +44,6 @@ public class IncrementalBackupFeedback implements BackupFeedback {
         if (success && copyResult != null)
             return copyResult.toString();
         else
-            return "Backup failed.";
+            return (throwable == null) ? "No further information." : (throwable.getLocalizedMessage());
     }
 }