Add BlockMask which is able to filter by data

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

@@ -0,0 +1,46 @@
+package com.sk89q.worldedit.masks;
+
+import java.util.Collection;
+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.BaseBlock;
+
+public class BlockMask implements Mask {
+
+    protected Set<BaseBlock> blocks;
+
+    public BlockMask() {
+        blocks = new HashSet<BaseBlock>();
+    }
+
+    public BlockMask(Set<BaseBlock> types) {
+        this.blocks = types;
+    }
+
+    public BlockMask(BaseBlock block) {
+        this();
+        add(block);
+    }
+
+    public void add(BaseBlock block) {
+        blocks.add(block);
+    }
+
+    public void addAll(Collection<BaseBlock> blocks) {
+        blocks.addAll(blocks);
+    }
+
+    public void prepare(LocalSession session, LocalPlayer player, Vector target) {
+    }
+
+    public boolean matches(EditSession editSession, Vector pos) {
+        BaseBlock block = editSession.getBlock(pos);
+        return  blocks.contains(block)
+                || blocks.contains(new BaseBlock(block.getType(), -1));
+   }
+}