Added a test case for BlockData.

Fixed some non-breaking inaccuracies to make the test case work.

src/main/java/com/sk89q/worldedit/data/BlockData.java

@@ -145,13 +145,13 @@ public final class BlockData {
             break;
 
         case BlockID.TRAP_DOOR:
-            int open = data & 0x4;
-            int withoutOpen = data & ~0x4;
-            switch (withoutOpen) {
-            case 0: return 3 | open;
-            case 1: return 2 | open;
-            case 2: return 0 | open;
-            case 3: return 1 | open;
+            int withoutOrientation = data & ~0x3;
+            int orientation = data & 0x3;
+            switch (orientation) {
+            case 0: return 3 | withoutOrientation;
+            case 1: return 2 | withoutOrientation;
+            case 2: return 0 | withoutOrientation;
+            case 3: return 1 | withoutOrientation;
             }
             break;
 
@@ -302,13 +302,13 @@ public final class BlockData {
             break;
 
         case BlockID.TRAP_DOOR:
-            int open = data & 0x4;
-            int withoutOpen = data & ~0x4;
-            switch (withoutOpen) {
-            case 3: return 0 | open;
-            case 2: return 1 | open;
-            case 0: return 2 | open;
-            case 1: return 3 | open;
+            int withoutOrientation = data & ~0x3;
+            int orientation = data & 0x3;
+            switch (orientation) {
+            case 3: return 0 | withoutOrientation;
+            case 2: return 1 | withoutOrientation;
+            case 0: return 2 | withoutOrientation;
+            case 1: return 3 | withoutOrientation;
             }
 
         case BlockID.PISTON_BASE:
@@ -380,6 +380,10 @@ public final class BlockData {
         case BlockID.TORCH:
         case BlockID.REDSTONE_TORCH_OFF:
         case BlockID.REDSTONE_TORCH_ON:
+            if (data > 4)
+                break;
+            /* FALL-THROUGH */
+
         case BlockID.LEVER:
         case BlockID.STONE_BUTTON:
             switch (data & ~0x8) {
@@ -470,6 +474,10 @@ public final class BlockData {
 
         case BlockID.PUMPKIN:
         case BlockID.JACKOLANTERN:
+            if (data > 3)
+                break;
+            /* FALL-THROUGH */
+
         case BlockID.REDSTONE_REPEATER_OFF:
         case BlockID.REDSTONE_REPEATER_ON:
             switch (data & 0x3) {

src/test/java/com/sk89q/worldedit/data/BlockDataTest.java

@@ -0,0 +1,49 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * 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.data;
+
+import org.junit.*;
+
+import com.sk89q.worldedit.CuboidClipboard.FlipDirection;
+
+import static org.junit.Assert.*;
+
+public class BlockDataTest {
+    @Test
+    public void testSlice() {
+        for (int type = 0; type < 256; ++type) {
+            for (int data = 0; data < 16; ++data) {
+                final String message = type+"/"+data;
+
+                assertEquals(message, data, BlockData.rotate90(type, BlockData.rotate90Reverse(type, data)));
+                assertEquals(message, data, BlockData.rotate90Reverse(type, BlockData.rotate90(type, data)));
+
+                int flipped = BlockData.flip(type, BlockData.flip(type, data, FlipDirection.WEST_EAST), FlipDirection.NORTH_SOUTH);
+
+                assertEquals(message, flipped, BlockData.rotate90(type, BlockData.rotate90(type, data)));
+                assertEquals(message, flipped, BlockData.rotate90Reverse(type, BlockData.rotate90Reverse(type, data)));
+
+                assertEquals(message, data, BlockData.flip(type, BlockData.flip(type, data, FlipDirection.NORTH_SOUTH), FlipDirection.NORTH_SOUTH));
+                assertEquals(message, data, BlockData.flip(type, BlockData.flip(type, data, FlipDirection.WEST_EAST), FlipDirection.WEST_EAST));
+                assertEquals(message, data, BlockData.flip(type, BlockData.flip(type, data, FlipDirection.UP_DOWN), FlipDirection.UP_DOWN));
+            }
+        }
+    }
+}