From afd26cdd12fef4bd2aafa2ac8d708e18d277a2fe Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Tue, 12 Jan 2021 12:51:23 +0800
Subject: Implement object collection(not tested) and sha256(tested)

---
 .../util/backup/inc/ObjectCollectionManager.java   | 11 --------
 .../backup/inc/identifier/ObjectIdentifier.java    |  9 ------
 .../inc/identifier/SingleHashIdentifier.java       | 32 ----------------------
 3 files changed, 52 deletions(-)
 delete mode 100644 src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java
 delete mode 100644 src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java
 delete mode 100644 src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java

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

diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java
deleted file mode 100644
index 9560261..0000000
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.keuin.kbackupfabric.util.backup.inc;
-
-/**
- * Incremental backup is implemented as git-like file collection.
- * Files are called `objects`, the collection contains all files distinguished by their
- * identifiers. Usually, identifier is the combination of hash and other short information (such as size and another hash).
- * The identifier should use hashes that are strong enough, to prevent possible collisions.
- */
-public class ObjectCollectionManager {
-
-}
diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java
deleted file mode 100644
index 079f49d..0000000
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.keuin.kbackupfabric.util.backup.inc.identifier;
-
-/**
- * The identifier distinguishing files in the object collection.
- * It should be based on cryptographic hash function in order to prevent possible attacks to the backup system.
- * All identifiers should be immutable and implement their own equals method.
- */
-public interface ObjectIdentifier {
-}
diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java
deleted file mode 100644
index 50b23bb..0000000
--- a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.keuin.kbackupfabric.util.backup.inc.identifier;
-
-import java.io.File;
-import java.util.Arrays;
-
-/**
- * A simple identifier based on a single hash function.
- */
-public abstract class SingleHashIdentifier implements ObjectIdentifier {
-
-    private final byte[] hash;
-
-    protected SingleHashIdentifier(byte[] hash) {
-        this.hash = Arrays.copyOf(hash, hash.length);
-    }
-
-    /**
-     * The hash function.
-     *
-     * @param file the file to be hashed.
-     * @return the hash bytes.
-     */
-    protected abstract byte[] hash(File file);
-
-    @Override
-    public boolean equals(Object obj) {
-        if (!(obj instanceof SingleHashIdentifier)) {
-            return false;
-        }
-        return Arrays.equals(hash, ((SingleHashIdentifier) obj).hash);
-    }
-}
-- 
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