From b4b6b413ad6ec16b1e9c236d8c78bca81a299e91 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Sat, 7 Mar 2015 22:17:03 -0600
Subject: [PATCH] Configurable speed for water flowing over lava


diff --git a/src/main/java/net/minecraft/server/BlockFlowing.java b/src/main/java/net/minecraft/server/BlockFlowing.java
index 842a27a..449b12f 100644
--- a/src/main/java/net/minecraft/server/BlockFlowing.java
+++ b/src/main/java/net/minecraft/server/BlockFlowing.java
@@ -35,7 +35,7 @@ public class BlockFlowing extends BlockFluids {
             b0 = 2;
         }
 
-        int j = this.a(world);
+        int j = this.getFlowSpeed(world, blockposition); // PaperSpigot
         int k;
 
         if (i > 0) {
@@ -259,8 +259,22 @@ public class BlockFlowing extends BlockFluids {
 
     public void onPlace(World world, BlockPosition blockposition, IBlockData iblockdata) {
         if (!this.e(world, blockposition, iblockdata)) {
-            world.a(blockposition, (Block) this, this.a(world));
+            world.a(blockposition, (Block) this, this.getFlowSpeed(world, blockposition)); // PaperSpigot
         }
 
     }
+
+    /**
+     * PaperSpigot - Get flow speed. Throttle if its water and flowing adjacent to lava
+     */
+    public int getFlowSpeed(World world, BlockPosition blockposition) {
+        if (this.getMaterial() == Material.WATER && (
+                world.getType(blockposition.north(1)).getBlock().getMaterial() == Material.LAVA ||
+                        world.getType(blockposition.south(1)).getBlock().getMaterial() == Material.LAVA ||
+                        world.getType(blockposition.west(1)).getBlock().getMaterial() == Material.LAVA ||
+                        world.getType(blockposition.east(1)).getBlock().getMaterial() == Material.LAVA)) {
+            return world.paperSpigotConfig.waterOverLavaFlowSpeed;
+        }
+        return super.a(world);
+    }
 }
diff --git a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
index ebe0a4f..41a80da 100644
--- a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
+++ b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
@@ -156,4 +156,11 @@ public class PaperSpigotWorldConfig
             log( "Falling Block Height Limit set to Y: " + fallingBlockHeightNerf );
         }
     }
+
+    public int waterOverLavaFlowSpeed;
+    private void waterOverLavaFlowSpeed()
+    {
+        waterOverLavaFlowSpeed = getInt( "water-over-lava-flow-speed", 5 );
+        log( "Water over lava flow speed: " + waterOverLavaFlowSpeed );
+    }
 }
-- 
1.9.1