Add API for managing mob spawn limits per-world. Fixes BUKKIT-1565

src/main/java/org/bukkit/Bukkit.java

@@ -353,4 +353,16 @@ public final class Bukkit {
     public static HelpMap getHelpMap() {
         return server.getHelpMap();
     }
+
+    public static int getMonsterSpawnLimit() {
+        return server.getMonsterSpawnLimit();
+    }
+
+    public static int getAnimalSpawnLimit() {
+        return server.getAnimalSpawnLimit();
+    }
+
+    public static int getWaterAnimalSpawnLimit() {
+        return server.getWaterAnimalSpawnLimit();
+    }
 }

src/main/java/org/bukkit/Server.java

@@ -621,4 +621,22 @@ public interface Server extends PluginMessageRecipient {
      * @throws IllegalArgumentException If the size is not a multiple of 9.
      */
     Inventory createInventory(InventoryHolder owner, int size, String title);
+
+    /**
+     * Gets user-specified limit for number of monsters that can spawn in a chunk
+     * @returns The monster spawn limit
+     */
+    int getMonsterSpawnLimit();
+
+    /**
+     * Gets user-specified limit for number of animals that can spawn in a chunk
+     * @returns The animal spawn limit
+     */
+    int getAnimalSpawnLimit();
+
+    /**
+     * Gets user-specified limit for number of water animals that can spawn in a chunk
+     * @returns The water animal spawn limit
+     */
+    int getWaterAnimalSpawnLimit();
 }

src/main/java/org/bukkit/World.java

@@ -895,6 +895,48 @@ public interface World extends PluginMessageRecipient, Metadatable {
      */
     public void setTicksPerMonsterSpawns(int ticksPerMonsterSpawns);
 
+    /**
+     * Gets limit for number of monsters that can spawn in a chunk in this world
+     * @returns The monster spawn limit
+     */
+    int getMonsterSpawnLimit();
+
+    /**
+     * Sets the limit for number of monsters that can spawn in a chunk in this world
+     * <p />
+     * <b>Note:</b>
+     * If set to a negative number the world will use the server-wide spawn limit instead.
+     */
+    void setMonsterSpawnLimit(int limit);
+
+    /**
+     * Gets the limit for number of animals that can spawn in a chunk in this world
+     * @returns The animal spawn limit
+     */
+    int getAnimalSpawnLimit();
+
+    /**
+     * Sets the limit for number of animals that can spawn in a chunk in this world
+     * <p />
+     * <b>Note:</b>
+     * If set to a negative number the world will use the server-wide spawn limit instead.
+     */
+    void setAnimalSpawnLimit(int limit);
+
+    /**
+     * Gets the limit for number of water animals that can spawn in a chunk in this world
+     * @returns The water animal spawn limit
+     */
+    int getWaterAnimalSpawnLimit();
+
+    /**
+     * Sets the limit for number of water animals that can spawn in a chunk in this world
+     * <p />
+     * <b>Note:</b>
+     * If set to a negative number the world will use the server-wide spawn limit instead.
+     */
+    void setWaterAnimalSpawnLimit(int limit);
+
     /**
      * Represents various map environment types that a world may be
      */