Add RegionSkins

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/region/Region.java

@@ -21,8 +21,10 @@ package de.steamwar.bausystem.region;
 
 import com.sk89q.worldedit.EditSession;
 import de.steamwar.bausystem.utils.PasteBuilder;
+import lombok.NonNull;
 import org.bukkit.Location;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.util.UUID;
 import java.util.function.BiConsumer;
@@ -42,24 +44,36 @@ public interface Region {
         return RegionSystem.INSTANCE.getGlobalRegion();
     }
 
+    @NonNull
     UUID getID();
 
+    @NonNull
     RegionType getType();
 
+    @NonNull
     FlagStorage getFlags();
 
+    @NonNull
     Area getArea();
 
+    @NonNull
     Area getBuildArea();
 
+    @NonNull
     Area getTestblockArea();
 
+    @NonNull
     RegionConfig getGameModeConfig();
 
+    @NonNull
     RegionHistory getHistory();
 
+    @NonNull
     RegionBackups getBackups();
 
+    @NonNull
+    RegionSkins getSkins();
+
     interface Area {
 
         Area EMPTY = new Area() {
@@ -116,16 +130,21 @@ public interface Region {
             return false;
         }
 
+        @NonNull
         Point getMinPoint(boolean extension);
 
+        @NonNull
         Point getMaxPoint(boolean extension);
 
+        @NonNull
         Point getCopyPoint();
 
         boolean inRegion(Location location, boolean extension);
 
+        @Nullable
         EditSession copy(boolean extension);
 
+        @Nullable
         File getResetFile();
 
         void reset(PasteBuilder pasteBuilder, boolean extension);