From 61ade9adad4668494dfc32da7751e1b86251dc97 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Mon, 30 Nov 2020 13:15:15 +0800
Subject: Implementing incremental backup

---
 .../operation/backup/IncrementalBackupMethod.java  | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/main/java/com/keuin/kbackupfabric/operation/backup/IncrementalBackupMethod.java

(limited to 'src/main/java/com/keuin/kbackupfabric/operation/backup/IncrementalBackupMethod.java')

diff --git a/src/main/java/com/keuin/kbackupfabric/operation/backup/IncrementalBackupMethod.java b/src/main/java/com/keuin/kbackupfabric/operation/backup/IncrementalBackupMethod.java
new file mode 100644
index 0000000..4a87bb3
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/operation/backup/IncrementalBackupMethod.java
@@ -0,0 +1,62 @@
+package com.keuin.kbackupfabric.operation.backup;
+
+import com.google.gson.JsonObject;
+import com.keuin.kbackupfabric.util.PrintUtil;
+import com.keuin.kbackupfabric.util.backup.builder.BackupFileNameBuilder;
+import com.keuin.kbackupfabric.util.backup.builder.ObjectTreeBackupFileNameBuilder;
+import com.keuin.kbackupfabric.util.backup.formatter.BackupFileNameFormatter;
+import com.keuin.kbackupfabric.util.backup.formatter.ObjectTreeBackupFileNameFormatter;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Paths;
+import java.time.LocalDateTime;
+
+public class IncrementalBackupMethod implements BackupMethod {
+
+    private static final IncrementalBackupMethod INSTANCE = new IncrementalBackupMethod();
+
+    public static IncrementalBackupMethod getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public BackupResult backup(String backupName, String levelPath, String backupSaveDirectory) throws IOException {
+        /*
+        1. Analyze the save directory, to get a json containing md5 values of all files.
+        2. Copy new files which we do not have in our backup repository.
+        3. Save the above json as a backup file. When restoring from this,
+           what we have to do is just copy all files back from the repository,
+           based on their md5 digests.
+         */
+
+        boolean success = true;
+        // Generate JSON
+        JsonObject hashJson = IncrementalBackupUtil.generateDirectoryJsonObject(levelPath);
+        // Copy files
+        long newFilesSizeBytes = IncrementalBackupUtil.saveNewFiles(backupSaveDirectory, levelPath, hashJson);
+        if(newFilesSizeBytes < 0) {
+            success = false;
+            PrintUtil.error("Failed to copy new files to object tree.");
+        }
+        // Save JSON tree
+        File jsonFile = new File(String.valueOf(Paths.get(backupSaveDirectory, BackupFileNameBuilder.objectTreeBackup().build(LocalDateTime.now(), backupName))));
+        // TODO
+        return new BackupResult(success, newFilesSizeBytes);
+    }
+
+    @Override
+    public boolean restore(String backupName, String levelPath, String backupSaveDirectory) throws IOException {
+        return false;
+    }
+
+    @Override
+    public BackupFileNameBuilder getBackupFileNameBuilder() {
+        return null;
+    }
+
+    @Override
+    public BackupFileNameFormatter getBackupFileNameFormatter() {
+        return null;
+    }
+}
-- 
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