Improve fire spread checks

sources/src/main/java/net/minecraft/server/BlockStationary.java

@@ -0,0 +1,118 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+import org.bukkit.craftbukkit.event.CraftEventFactory;  // CraftBukkit
+
+public class BlockStationary extends BlockFluids {
+
+    protected BlockStationary(Material material) {
+        super(material);
+        this.a(false);
+        if (material == Material.LAVA) {
+            this.a(true);
+        }
+
+    }
+
+    public void a(IBlockData iblockdata, World world, BlockPosition blockposition, Block block, BlockPosition blockposition1) {
+        if (!this.e(world, blockposition, iblockdata)) {
+            this.f(world, blockposition, iblockdata);
+        }
+
+    }
+
+    private void f(World world, BlockPosition blockposition, IBlockData iblockdata) {
+        BlockFlowing blockflowing = a(this.material);
+
+        world.setTypeAndData(blockposition, blockflowing.getBlockData().set(BlockStationary.LEVEL, iblockdata.get(BlockStationary.LEVEL)), 2);
+        world.a(blockposition, (Block) blockflowing, this.a(world));
+    }
+
+    public void b(World world, BlockPosition blockposition, IBlockData iblockdata, Random random) {
+        if (this.material == Material.LAVA) {
+            if (world.getGameRules().getBoolean("doFireTick")) {
+                int i = random.nextInt(3);
+
+                if (i > 0) {
+                    BlockPosition blockposition1 = blockposition;
+
+                    for (int j = 0; j < i; ++j) {
+                        blockposition1 = blockposition1.a(random.nextInt(3) - 1, 1, random.nextInt(3) - 1);
+                        if (blockposition1.getY() >= 0 && blockposition1.getY() < 256 && !world.isLoaded(blockposition1)) {
+                            return;
+                        }
+
+                        Block block = world.getType(blockposition1).getBlock();
+
+                        if (block.material == Material.AIR) {
+                            if (this.c(world, blockposition1)) {
+                                 // CraftBukkit start - Prevent lava putting something on fire
+                                if (world.getType(blockposition1) != Blocks.FIRE) {
+                                    if (CraftEventFactory.callBlockIgniteEvent(world, blockposition1.getX(), blockposition1.getY(), blockposition1.getZ(), blockposition.getX(), blockposition.getY(), blockposition.getZ()).isCancelled()) {
+                                        continue;
+                                    }
+                                }
+                                // CraftBukkit end
+                                world.setTypeUpdate(blockposition1, Blocks.FIRE.getBlockData());
+                                return;
+                            }
+                        } else if (block.material.isSolid()) {
+                            return;
+                        }
+                    }
+                } else {
+                    for (int k = 0; k < 3; ++k) {
+                        BlockPosition blockposition2 = blockposition.a(random.nextInt(3) - 1, 0, random.nextInt(3) - 1);
+
+                        if (blockposition2.getY() >= 0 && blockposition2.getY() < 256 && !world.isLoaded(blockposition2)) {
+                            return;
+                        }
+
+                        if (world.isEmpty(blockposition2.up()) && this.d(world, blockposition2)) {
+                            // CraftBukkit start - Prevent lava putting something on fire
+                            BlockPosition up = blockposition2.up();
+                            if (world.getType(up) != Blocks.FIRE) {
+                                if (CraftEventFactory.callBlockIgniteEvent(world, up.getX(), up.getY(), up.getZ(), blockposition.getX(), blockposition.getY(), blockposition.getZ()).isCancelled()) {
+                                    continue;
+                                }
+                            }
+                            // CraftBukkit end
+                            world.setTypeUpdate(blockposition2.up(), Blocks.FIRE.getBlockData());
+                        }
+                    }
+                }
+
+            }
+        }
+    }
+
+    protected boolean c(World world, BlockPosition blockposition) {
+        EnumDirection[] aenumdirection = EnumDirection.values();
+        int i = aenumdirection.length;
+
+        for (int j = 0; j < i; ++j) {
+            EnumDirection enumdirection = aenumdirection[j];
+
+            if (this.d(world, blockposition.shift(enumdirection))) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private boolean d(World world, BlockPosition blockposition) {
+        // Dionysus start - improve fire spread checks
+        if (blockposition.getY() >= 0 && blockposition.getY() < 256) {
+            IBlockData blockData = world.getTypeIfLoaded(blockposition);
+
+            if (blockData != null) {
+                return blockData.getMaterial().isBurnable();
+            }
+        }
+
+        return false;
+        // Dionysus end
+    }
+}