data improvements

src/main/java/net/minecraft/server/BlockSand.java

@@ -0,0 +1,64 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+public class BlockSand extends Block {
+
+    public static boolean instaFall = false;
+
+    public BlockSand(int i, int j) {
+        super(i, j, Material.SAND);
+    }
+
+    public void a(World world, int i, int j, int k) {
+        world.c(i, j, k, this.id, this.c());
+    }
+
+    public void doPhysics(World world, int i, int j, int k, int l) {
+        world.c(i, j, k, this.id, this.c());
+    }
+
+    public void a(World world, int i, int j, int k, Random random) {
+        this.g(world, i, j, k);
+    }
+
+    private void g(World world, int i, int j, int k) {
+        if (d_(world, i, j - 1, k) && j >= 0) {
+            byte b0 = 32;
+
+            if (!instaFall && world.a(i - b0, j - b0, k - b0, i + b0, j + b0, k + b0)) {
+                EntityFallingSand entityfallingsand = new EntityFallingSand(world, (double) ((float) i + 0.5F), (double) ((float) j + 0.5F), (double) ((float) k + 0.5F), this.id, world.getData(i, j, k));
+
+                world.addEntity(entityfallingsand);
+            } else {
+                world.setTypeId(i, j, k, 0);
+
+                while (d_(world, i, j - 1, k) && j > 0) {
+                    --j;
+                }
+
+                if (j > 0) {
+                    world.setTypeId(i, j, k, this.id);
+                }
+            }
+        }
+    }
+
+    public int c() {
+        return 3;
+    }
+
+    public static boolean d_(World world, int i, int j, int k) {
+        int l = world.getTypeId(i, j, k);
+
+        if (l == 0) {
+            return true;
+        } else if (l == Block.FIRE.id) {
+            return true;
+        } else {
+            Material material = Block.byId[l].material;
+
+            return material == Material.WATER ? true : material == Material.LAVA;
+        }
+    }
+}