From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 30 Apr 2018 17:55:28 -0400
Subject: [PATCH] Additional world.getNearbyEntities API's

Provides more methods to get nearby entities, and filter by types and predicates

diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index c4f2f03ec31998d486dad1d45ef83df3f77b5e28..9cf4823ddf1b8291e8c11c39c02c1fed58c18936 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -1,6 +1,9 @@
 package org.bukkit;
 
 import java.io.File;
+import org.bukkit.generator.ChunkGenerator;
+
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -663,6 +666,238 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
     @NotNull
     public Collection<Entity> getEntitiesByClasses(@NotNull Class<?>... classes);
 
+    // Paper start - additional getNearbyEntities API
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param radius Radius
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double radius) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, radius, radius, radius);
+    }
+
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xzRadius X/Z Radius
+     * @param yRadius Y Radius
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double xzRadius, final double yRadius) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, xzRadius, yRadius, xzRadius);
+    }
+
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xRadius X Radius
+     * @param yRadius Y Radius
+     * @param zRadius Z radius
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, xRadius, yRadius, zRadius);
+    }
+
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param radius X Radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of living entities near location. This will always be a non-null collection
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double radius, final @Nullable Predicate<? super LivingEntity> predicate) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, radius, radius, radius, predicate);
+    }
+
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xzRadius X/Z Radius
+     * @param yRadius Y Radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of living entities near location. This will always be a non-null collection
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double xzRadius, final double yRadius, final @Nullable Predicate<? super LivingEntity> predicate) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, xzRadius, yRadius, xzRadius, predicate);
+    }
+
+    /**
+     * Gets nearby LivingEntities within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xRadius X Radius
+     * @param yRadius Y Radius
+     * @param zRadius Z radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of living entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<LivingEntity> getNearbyLivingEntities(final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius, final @Nullable Predicate<? super LivingEntity> predicate) {
+        return this.getNearbyEntitiesByType(LivingEntity.class, loc, xRadius, yRadius, zRadius, predicate);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param radius X/Y/Z Radius
+     * @return the collection of living entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double radius) {
+        return this.getNearbyEntitiesByType(Player.class, loc, radius, radius, radius);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xzRadius X/Z Radius
+     * @param yRadius Y Radius
+     * @return the collection of living entities near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double xzRadius, final double yRadius) {
+        return this.getNearbyEntitiesByType(Player.class, loc, xzRadius, yRadius, xzRadius);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xRadius X Radius
+     * @param yRadius Y Radius
+     * @param zRadius Z Radius
+     * @return the collection of players near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius) {
+        return this.getNearbyEntitiesByType(Player.class, loc, xRadius, yRadius, zRadius);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param radius X/Y/Z Radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of players near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double radius, final @Nullable Predicate<? super Player> predicate) {
+        return this.getNearbyEntitiesByType(Player.class, loc, radius, radius, radius, predicate);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xzRadius X/Z Radius
+     * @param yRadius Y Radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of players near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double xzRadius, final double yRadius, final @Nullable Predicate<? super Player> predicate) {
+        return this.getNearbyEntitiesByType(Player.class, loc, xzRadius, yRadius, xzRadius, predicate);
+    }
+
+    /**
+     * Gets nearby players within the specified radius (bounding box)
+     * @param loc Center location
+     * @param xRadius X Radius
+     * @param yRadius Y Radius
+     * @param zRadius Z Radius
+     * @param predicate a predicate used to filter results
+     * @return the collection of players near location. This will always be a non-null collection.
+     */
+    default @NotNull Collection<Player> getNearbyPlayers(final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius, final @Nullable Predicate<? super Player> predicate) {
+        return this.getNearbyEntitiesByType(Player.class, loc, xRadius, yRadius, zRadius, predicate);
+    }
+
+    /**
+     * Gets all nearby entities of the specified type, within the specified radius (bounding box)
+     * @param clazz Type to filter by
+     * @param loc Center location
+     * @param radius X/Y/Z radius to search within
+     * @param <T> the entity type
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull <T extends Entity> Collection<T> getNearbyEntitiesByType(final @Nullable Class<? extends T> clazz, final @NotNull Location loc, final double radius) {
+        return this.getNearbyEntitiesByType(clazz, loc, radius, radius, radius, null);
+    }
+
+    /**
+     * Gets all nearby entities of the specified type, within the specified radius, with x and x radius matching (bounding box)
+     * @param clazz Type to filter by
+     * @param loc Center location
+     * @param xzRadius X/Z radius to search within
+     * @param yRadius Y radius to search within
+     * @param <T> the entity type
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull <T extends Entity> Collection<T> getNearbyEntitiesByType(final @Nullable Class<? extends T> clazz, final @NotNull Location loc, final double xzRadius, final double yRadius) {
+        return this.getNearbyEntitiesByType(clazz, loc, xzRadius, yRadius, xzRadius, null);
+    }
+
+    /**
+     * Gets all nearby entities of the specified type, within the specified radius (bounding box)
+     * @param clazz Type to filter by
+     * @param loc Center location
+     * @param xRadius X Radius
+     * @param yRadius Y Radius
+     * @param zRadius Z Radius
+     * @param <T> the entity type
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull <T extends Entity> Collection<T> getNearbyEntitiesByType(final @Nullable Class<? extends T> clazz, final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius) {
+        return this.getNearbyEntitiesByType(clazz, loc, xRadius, yRadius, zRadius, null);
+    }
+
+    /**
+     * Gets all nearby entities of the specified type, within the specified radius (bounding box)
+     * @param clazz Type to filter by
+     * @param loc Center location
+     * @param radius X/Y/Z radius to search within
+     * @param predicate a predicate used to filter results
+     * @param <T> the entity type
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull <T extends Entity> Collection<T> getNearbyEntitiesByType(final @Nullable Class<? extends T> clazz, final @NotNull Location loc, final double radius, final @Nullable Predicate<? super T> predicate) {
+        return this.getNearbyEntitiesByType(clazz, loc, radius, radius, radius, predicate);
+    }
+
+    /**
+     * Gets all nearby entities of the specified type, within the specified radius, with x and x radius matching (bounding box)
+     * @param clazz Type to filter by
+     * @param loc Center location
+     * @param xzRadius X/Z radius to search within
+     * @param yRadius Y radius to search within
+     * @param predicate a predicate used to filter results
+     * @param <T> the entity type
+     * @return the collection of entities near location. This will always be a non-null collection.
+     */
+    default @NotNull <T extends Entity> Collection<T> getNearbyEntitiesByType(final @Nullable Class<? extends T> clazz, final @NotNull Location loc, final double xzRadius, final double yRadius, final @Nullable Predicate<? super T> predicate) {
+        return this.getNearbyEntitiesByType(clazz, loc, xzRadius, yRadius, xzRadius, predicate);
+    }
+
+     /**
+      * Gets all nearby entities of the specified type, within the specified radius (bounding box)
+      * @param clazz Type to filter by
+      * @param loc Center location
+      * @param xRadius X Radius
+      * @param yRadius Y Radius
+      * @param zRadius Z Radius
+      * @param predicate a predicate used to filter results
+      * @param <T> the entity type
+      * @return the collection of entities near location. This will always be a non-null collection.
+      */
+     default <T extends Entity> @NotNull Collection<T> getNearbyEntitiesByType(@Nullable Class<? extends Entity> clazz, final @NotNull Location loc, final double xRadius, final double yRadius, final double zRadius, final @Nullable Predicate<? super T> predicate) {
+         if (clazz == null) {
+            clazz = Entity.class;
+        }
+        final List<T> nearby = new ArrayList<>();
+        for (final Entity bukkitEntity : this.getNearbyEntities(loc, xRadius, yRadius, zRadius)) {
+            //noinspection unchecked
+            if (clazz.isAssignableFrom(bukkitEntity.getClass()) && (predicate == null || predicate.test((T) bukkitEntity))) {
+                //noinspection unchecked
+                nearby.add((T) bukkitEntity);
+            }
+        }
+        return nearby;
+    }
+    // Paper end - additional getNearbyEntities API
+
     /**
      * Get a list of all players in this World
      *