Allow fishing success rate to be adjustable. Adds BUKKIT-3837

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

@@ -234,13 +234,7 @@ public class EntityFishingHook extends Entity {
                     if (this.au > 0) {
                         --this.au;
                     } else {
-                        short short1 = 500;
+                        if (random.nextDouble() < ((org.bukkit.entity.Fish) this.getBukkitEntity()).getBiteChance()) { // CraftBukkit - moved logic to CraftFish
-
-                        if (this.world.F(MathHelper.floor(this.locX), MathHelper.floor(this.locY) + 1, MathHelper.floor(this.locZ))) {
-                            short1 = 300;
-                        }
-
-                        if (this.random.nextInt(short1) == 0) {
                             this.au = this.random.nextInt(30) + 10;
                             this.motY -= 0.20000000298023224D;
                             this.makeSound("random.splash", 0.25F, 1.0F + (this.random.nextFloat() - this.random.nextFloat()) * 0.4F);

src/main/java/org/bukkit/craftbukkit/entity/CraftFish.java

@@ -2,13 +2,17 @@ package org.bukkit.craftbukkit.entity;
 
 import net.minecraft.server.EntityFishingHook;
 import net.minecraft.server.EntityHuman;
+import net.minecraft.server.MathHelper;
 
+import org.apache.commons.lang.Validate;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Fish;
 import org.bukkit.entity.LivingEntity;
 
 public class CraftFish extends AbstractProjectile implements Fish {
+    private double biteChance = -1;
+
     public CraftFish(CraftServer server, EntityFishingHook entity) {
         super(server, entity);
     }
@@ -40,4 +44,21 @@ public class CraftFish extends AbstractProjectile implements Fish {
     public EntityType getType() {
         return EntityType.FISHING_HOOK;
     }
+
+    public double getBiteChance() {
+        EntityFishingHook hook = getHandle();
+
+        if (this.biteChance == -1) {
+            if (hook.world.F(MathHelper.floor(hook.locX), MathHelper.floor(hook.locY) + 1, MathHelper.floor(hook.locZ))) {
+                return 1/300.0;
+            }
+            return 1/500.0;
+        }
+        return this.biteChance;
+    }
+
+    public void setBiteChance(double chance) {
+        Validate.isTrue(chance >= 0 && chance <= 1, "The bite chance must be between 0 and 1.");
+        this.biteChance = chance;
+    }
 }