Implement InvertedMask & UnderOverlayMask as decorators

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -614,31 +614,13 @@ public class WorldEdit {
 
         case '>':
         case '<':
-            final LocalWorld world = player.getWorld();
-            final boolean over = firstChar == '>';
-            final String idString = component.substring(1);
-            final Set<Integer> ids = new HashSet<Integer>();
-
-            if (!(idString.equals("*") || idString.equals(""))) {
-                for (String sid : idString.split(",")) {
-                    try {
-                        final int pid = Integer.parseInt(sid);
-                        if (!world.isValidBlockType(pid)) {
-                            throw new UnknownItemException(sid);
-                        }
-                        ids.add(pid);
-                    } catch (NumberFormatException e) {
-                        final BlockType type = BlockType.lookup(sid);
-                        final int id = type.getID();
-                        if (!world.isValidBlockType(id)) {
-                            throw new UnknownItemException(sid);
-                        }
-                        ids.add(id);
-                    }
-                }
+            Mask submask;
+            if (component.length() > 1) {
+                submask = getBlockMaskComponent(player, session, masks, component.substring(1));
+            } else {
+                submask = new ExistingBlockMask();
             }
-
-            return new UnderOverlayMask(ids, over);
+            return new UnderOverlayMask(submask, firstChar == '>'); 
 
         case '$':
             Set<BiomeType> biomes = new HashSet<BiomeType>();
@@ -651,7 +633,7 @@ public class WorldEdit {
 
         case '!':
             if (component.length() > 1) {
-                return new InvertedBlockTypeMask(getBlockIDs(player, component.substring(1), true));
+                return new InvertedMask(getBlockMaskComponent(player, session, masks, component.substring(1)));
             }
 
         default:

src/main/java/com/sk89q/worldedit/masks/InvertedBlockTypeMask.java

@@ -28,6 +28,7 @@ import com.sk89q.worldedit.Vector;
  *
  * @author sk89q
  */
+@Deprecated
 public class InvertedBlockTypeMask extends BlockTypeMask {
     public InvertedBlockTypeMask() {
     }

src/main/java/com/sk89q/worldedit/masks/InvertedMask.java

@@ -0,0 +1,25 @@
+package com.sk89q.worldedit.masks;
+
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.LocalPlayer;
+import com.sk89q.worldedit.LocalSession;
+import com.sk89q.worldedit.Vector;
+
+public class InvertedMask implements Mask {
+
+    private Mask mask;
+
+    public InvertedMask(Mask mask) {
+        this.mask = mask;
+    }
+
+    public void prepare(LocalSession session, LocalPlayer player, Vector target) {
+        mask.prepare(session, player, target);
+    }
+
+    @Override
+    public boolean matches(EditSession editSession, Vector pos) {
+        return !mask.matches(editSession, pos);
+    }
+
+}

src/main/java/com/sk89q/worldedit/masks/UnderOverlayMask.java

@@ -19,14 +19,12 @@
 
 package com.sk89q.worldedit.masks;
 
-import java.util.HashSet;
 import java.util.Set;
 
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.LocalPlayer;
 import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.Vector;
-import com.sk89q.worldedit.blocks.BlockID;
 
 /**
  *
@@ -34,24 +32,37 @@ import com.sk89q.worldedit.blocks.BlockID;
  */
 public class UnderOverlayMask implements Mask {
 
-    boolean overlay;
-    Set<Integer> ids = new HashSet<Integer>();
+    private int yMod;
+    private Mask mask;
 
+    @Deprecated
     public UnderOverlayMask(Set<Integer> ids, boolean overlay) {
-        addAll(ids);
-        this.overlay = overlay;
+        this(new BlockTypeMask(ids), overlay); 
+    }
+    
+    public UnderOverlayMask(Mask mask, boolean overlay) {
+        this.yMod = overlay ? -1 : 1;
+        this.mask = mask;
     }
 
+    @Deprecated
     public void addAll(Set<Integer> ids) {
-        this.ids.addAll(ids);
+        if (mask instanceof BlockTypeMask) {
+            BlockTypeMask blockTypeMask = (BlockTypeMask) mask;
+            for (Integer id : ids) {
+                blockTypeMask.add(id);
+            }
+        } else if (mask instanceof ExistingBlockMask) {
+            mask = new BlockTypeMask(ids);
+        }
     }
 
     public void prepare(LocalSession session, LocalPlayer player, Vector target) {
+        mask.prepare(session, player, target);
     }
 
     public boolean matches(EditSession editSession, Vector pos) {
-        int id = editSession.getBlock(pos.setY(pos.getBlockY() + (overlay ? -1 : 1))).getType();
-        return ids.isEmpty() ? id != BlockID.AIR : ids.contains(id);
+        return mask.matches(editSession, pos.add(0, yMod, 0));
     }
 
 }