Added BoundedYMask that requires that Y is in a range.

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

@@ -0,0 +1,47 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.masks;
+
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.Vector;
+
+/**
+ * Fails all tests against locations outside a range of Y values.
+ */
+public class BoundedYMask extends AbstractMask {
+
+    private final int minY;
+    private final int maxY;
+
+    public BoundedYMask(int minY, int maxY) {
+        if (minY > maxY) {
+            throw new IllegalArgumentException("minY must be less than or equal to maxY");
+        }
+        this.minY = minY;
+        this.maxY = maxY;
+    }
+
+    @Override
+    public boolean matches(EditSession editSession, Vector pos) {
+        int y = pos.getBlockY();
+        return y >= minY && y <= maxY;
+    }
+
+}