Fix RegionConfig

Implement FixedRegion
Add RegionHistory.Impl

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

@@ -19,6 +19,7 @@
 
 package de.steamwar.bausystem.region;
 
+import de.steamwar.core.FlatteningWrapper;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -117,7 +118,7 @@ public class RegionConfig {
         private void load(ConfigurationSection section) {
             Active = section.getBoolean("Active", false);
             ObfuscateWith = Material.getMaterial(section.getString("ObfuscateWith", "END_STONE"));
-            HiddenBlocks = section.getStringList("HiddenBlocks").stream().map(Material::getMaterial).collect(Collectors.toUnmodifiableSet());
+            HiddenBlocks = section.getStringList("HiddenBlocks").stream().map(FlatteningWrapper.impl::getMaterial).filter(Objects::nonNull).collect(Collectors.toUnmodifiableSet());
             HiddenBlockEntities = Collections.unmodifiableSet(new HashSet<>(section.getStringList("HiddenBlockEntities")));
         }
     }

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

@@ -20,7 +20,11 @@
 package de.steamwar.bausystem.region;
 
 import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.WorldEdit;
+import com.sk89q.worldedit.bukkit.BukkitWorld;
+import de.steamwar.bausystem.shared.SizedStack;
 import lombok.NonNull;
+import org.bukkit.Bukkit;
 
 public interface RegionHistory {
 
@@ -45,4 +49,44 @@ public interface RegionHistory {
             return false;
         }
     };
+
+    class Impl implements RegionHistory {
+
+        private SizedStack<EditSession> undoSessions;
+        private SizedStack<EditSession> redoSessions;
+
+        public Impl(int size) {
+            this.undoSessions = new SizedStack<>(size);
+            this.redoSessions = new SizedStack<>(size);
+        }
+
+        @Override
+        public void remember(@NonNull EditSession editSession) {
+            undoSessions.push(editSession);
+            if (redoSessions.empty()) return;
+            redoSessions.clear();
+        }
+
+        @Override
+        public boolean undo() {
+            EditSession session = undoSessions.pop();
+            if (session == null) return false;
+            try (EditSession e = WorldEdit.getInstance().getEditSessionFactory().getEditSession(new BukkitWorld(Bukkit.getWorlds().get(0)), -1)) {
+                session.undo(e);
+                redoSessions.push(e);
+            }
+            return true;
+        }
+
+        @Override
+        public boolean redo() {
+            EditSession session = redoSessions.pop();
+            if (session == null) return false;
+            try (EditSession e = WorldEdit.getInstance().getEditSessionFactory().getEditSession(new BukkitWorld(Bukkit.getWorlds().get(0)), -1)) {
+                session.redo(e);
+                undoSessions.push(e);
+            }
+            return true;
+        }
+    }
 }

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/shared/SizedStack.java

@@ -130,6 +130,12 @@ public class SizedStack<T> {
         return size;
     }
 
+    public void clear() {
+        this.data = (T[]) new Object[this.maxSize];
+        this.head = 0;
+        this.size = 0;
+    }
+
     @Override
     public String toString() {
         final StringBuilder result = new StringBuilder("[");