Make serialization util class

src/main/java/wtf/beatrice/hidekobot/util/SerializationUtil.java

@@ -0,0 +1,38 @@
+package wtf.beatrice.hidekobot.util;
+
+import org.apache.commons.lang3.SerializationException;
+
+import java.io.*;
+import java.util.Base64;
+import java.util.LinkedList;
+import java.util.List;
+
+public class SerializationUtil
+{
+
+    public static String serializeBase64(List dataList) {
+
+        try (ByteArrayOutputStream bo = new ByteArrayOutputStream();
+             ObjectOutputStream so = new ObjectOutputStream(bo)) {
+            so.writeObject(dataList);
+            so.flush();
+            return Base64.getEncoder().encodeToString(bo.toByteArray());
+        }
+        catch (IOException ignored) {}
+        return null;
+    }
+
+    public static LinkedList deserializeBase64(String dataStr) {
+
+        byte[] b = Base64.getDecoder().decode(dataStr);
+        ByteArrayInputStream bi = new ByteArrayInputStream(b);
+        ObjectInputStream si;
+        try {
+            si = new ObjectInputStream(bi);
+            return LinkedList.class.cast(si.readObject());
+        }
+        catch (IOException | ClassNotFoundException e) {
+            throw new SerializationException("Error during deserialization", e);
+        }
+    }
+}