Add punishments and container

src/main/java/de/shiewk/smoderation/util/ByteUtil.java

@@ -0,0 +1,45 @@
+package de.shiewk.smoderation.util;
+
+import java.nio.ByteBuffer;
+import java.util.UUID;
+
+
+/**
+ * Utility class for byte-based saving of integers, longs and UUIDs
+ */
+public abstract class ByteUtil {
+    private ByteUtil(){}
+
+    public static byte[] longToBytes(long v){
+        ByteBuffer buffer = ByteBuffer.allocate(8);
+        buffer.putLong(v);
+        return buffer.array();
+    }
+
+    public static long bytesToLong(byte[] i){
+        if (i.length != 8){
+            throw new IllegalArgumentException("length must be 8");
+        }
+        ByteBuffer buffer = ByteBuffer.allocate(8);
+        buffer.put(0, i);
+        return buffer.getLong(0);
+    }
+
+    public static byte[] uuidToBytes(UUID uuid){
+        byte[] l = longToBytes(uuid.getLeastSignificantBits());
+        byte[] m = longToBytes(uuid.getMostSignificantBits());
+        return new byte[]{
+                m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7],
+                l[0], l[1], l[2], l[3], l[4], l[5], l[6], l[7]
+        };
+    }
+
+    public static UUID bytesToUuid(byte[] i){
+        if (i.length != 16){
+            throw new IllegalArgumentException("length must be 16, was " + i.length);
+        }
+        long l = bytesToLong(new byte[]{ i[8], i[9], i[10], i[11], i[12], i[13], i[14], i[15] });
+        long m = bytesToLong(new byte[]{ i[0], i[1], i[2], i[3], i[4], i[5], i[6], i[7] });
+        return new UUID(m, l);
+    }
+}