From 5dc6e700cbcbc01833a02a193f660a286b934898 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Fri, 13 Jan 2023 02:49:57 +0800
Subject: Code cleanup.

---
 .../util/backup/incremental/ObjectCollection.java  |  2 +-
 .../incremental/identifier/Sha256Identifier.java   | 35 ++--------------------
 .../identifier/SingleHashIdentifier.java           | 11 ++++---
 3 files changed, 9 insertions(+), 39 deletions(-)

(limited to 'src/main/java/com/keuin/kbackupfabric/util/backup/incremental')

diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/ObjectCollection.java b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/ObjectCollection.java
index 0cd36a0..38b96ab 100644
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/ObjectCollection.java
+++ b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/ObjectCollection.java
@@ -8,7 +8,7 @@ import java.util.*;
  * or it will not be compatible with old backups.
  * It remains only to keep a backward compatibility, and should be converted to `ObjectCollection2` as soon as possible.
  * Thus, this class is marked as `Depreciated`. However, it should not be removed since it is needed to read legacy
- * backups correctly. But new codes should not use this class any more.
+ * backups correctly. But new codes should not use this class anymore.
  */
 @Deprecated
 public class ObjectCollection implements Serializable {
diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/Sha256Identifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/Sha256Identifier.java
index 31cde29..c640c0b 100644
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/Sha256Identifier.java
+++ b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/Sha256Identifier.java
@@ -3,12 +3,11 @@ package com.keuin.kbackupfabric.util.backup.incremental.identifier;
 import com.keuin.kbackupfabric.util.BytesUtil;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.util.Objects;
 
+import static com.keuin.kbackupfabric.backup.incremental.identifier.Sha256Identifier.sha256Hash;
+
 /**
  * Identifier based on sha256.
  * Immutable.
@@ -50,35 +49,7 @@ public class Sha256Identifier extends SingleHashIdentifier {
 
     @Override
     protected byte[] hash(File file) throws IOException {
-        try {
-            MessageDigest digest = MessageDigest.getInstance("SHA-256");
-
-            try (FileInputStream inputStream = new FileInputStream(file)) {
-                // This does not work. I don't know why
-//            FileChannel channel = inputStream.getChannel();
-//            ByteBuffer buffer = ByteBuffer.allocate(128);
-//            int readLength;
-//            while ((readLength = channel.read(buffer)) > 0)
-//                digest.update(buffer);
-
-                // This also works, without warnings
-                byte[] readBuffer = new byte[1024 * 1024];
-                int readLength;
-                while ((readLength = inputStream.read(readBuffer)) > 0)
-                    digest.update(readBuffer, 0, readLength);
-
-                // The below lines also works, but the IDE will complain about the while loop
-//            DigestInputStream digestInputStream = new DigestInputStream(inputStream, digest);
-//            while(digestInputStream.read() > 0)
-//                ;
-
-                return digest.digest();
-            }
-
-        } catch (NoSuchAlgorithmException ignored) {
-            // this shouldn't happen
-            return new byte[SHA256_LENGTH];
-        }
+        return sha256Hash(file);
     }
 
 }
\ No newline at end of file
diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/SingleHashIdentifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/SingleHashIdentifier.java
index 6c67918..285c6ce 100644
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/SingleHashIdentifier.java
+++ b/src/main/java/com/keuin/kbackupfabric/util/backup/incremental/identifier/SingleHashIdentifier.java
@@ -12,7 +12,6 @@ import java.util.Objects;
  * Immutable.
  */
 public abstract class SingleHashIdentifier implements ObjectIdentifier {
-
     private final byte[] hash;
     private final String type;
 
@@ -37,11 +36,11 @@ public abstract class SingleHashIdentifier implements ObjectIdentifier {
     }
 
     @Override
-    public boolean equals(Object obj) {
-        if (!(obj instanceof com.keuin.kbackupfabric.backup.incremental.identifier.SingleHashIdentifier)) {
-            return false;
-        }
-        return Arrays.equals(hash, ((SingleHashIdentifier) obj).hash);
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SingleHashIdentifier that = (SingleHashIdentifier) o;
+        return Arrays.equals(hash, that.hash) && type.equals(that.type);
     }
 
     @Override
-- 
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