From 08ac6aaea58b7309ea95a12ca6227a6ca3ce4db5 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Mon, 25 Jan 2021 15:25:34 +0800
Subject: Improve user interaction. Code refactor.

---
 .../com/keuin/kbackupfabric/ui/BackupManager.java  | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/main/java/com/keuin/kbackupfabric/ui/BackupManager.java

(limited to 'src/main/java/com/keuin/kbackupfabric/ui/BackupManager.java')

diff --git a/src/main/java/com/keuin/kbackupfabric/ui/BackupManager.java b/src/main/java/com/keuin/kbackupfabric/ui/BackupManager.java
new file mode 100644
index 0000000..abd7d5b
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/ui/BackupManager.java
@@ -0,0 +1,64 @@
+package com.keuin.kbackupfabric.ui;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Iterator;
+
+/**
+ * Holding all types of backups for the user interaction logic.
+ */
+public class BackupManager {
+
+    private final File backupStorageDirectory;
+
+    public BackupManager(File backupStorageDirectory) {
+        this.backupStorageDirectory = backupStorageDirectory;
+    }
+
+    public BackupManager(String backupStorageDirectory) {
+        this.backupStorageDirectory = new File(backupStorageDirectory);
+    }
+
+    /**
+     * Get available backups in the disk.
+     *
+     * @return all backups.
+     */
+    public Iterable<BackupInfo> getAllBackups() {
+        return new Iterable<BackupInfo>() {
+            @NotNull
+            @Override
+            public Iterator<BackupInfo> iterator() {
+                return new Iterator<BackupInfo>() {
+                    private final Iterator<File> fileIterator = Arrays.stream(backupStorageDirectory.listFiles()).filter(file -> {
+                        String name = file.getName().toLowerCase();
+                        return name.endsWith(".zip") || name.endsWith(".kbi");
+                    }).iterator();
+
+                    @Override
+                    public boolean hasNext() {
+                        return fileIterator.hasNext();
+                    }
+
+                    @Override
+                    public BackupInfo next() {
+                        try {
+                            File backupFile = fileIterator.next();
+                            String fileName = backupFile.getName().toLowerCase();
+                            if (fileName.endsWith(".zip"))
+                                return PrimitiveBackupInfo.fromFile(backupFile);
+                            if (fileName.endsWith(".kbi"))
+                                return IncrementalBackupInfo.fromFile(backupFile);
+                            throw new RuntimeException("Invalid backup file extname");
+                        } catch (IOException e) {
+                            throw new RuntimeException(e);
+                        }
+                    }
+                };
+            }
+        };
+    }
+}
-- 
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