#1150: Add Sniffer API and handle EntityItemDropEvent

By: Doc <nachito94@msn.com>

paper-server/nms-patches/net/minecraft/world/entity/animal/sniffer/Sniffer.patch

@@ -24,7 +24,53 @@
      @Override
      protected float getStandingEyeHeight(EntityPose entitypose, EntitySize entitysize) {
          return this.getDimensions(entitypose).height * 0.6F;
-@@ -278,7 +287,7 @@
+@@ -114,7 +123,7 @@
+         return BlockPosition.containing(vec3d.x(), this.getY(), vec3d.z());
+     }
+ 
+-    private Sniffer.a getState() {
++    public Sniffer.a getState() { // PAIL private -> public
+         return (Sniffer.a) this.entityData.get(Sniffer.DATA_STATE);
+     }
+ 
+@@ -207,7 +216,7 @@
+         return this;
+     }
+ 
+-    Optional<BlockPosition> calculateDigPosition() {
++    public Optional<BlockPosition> calculateDigPosition() { // PAIL public
+         return IntStream.range(0, 5).mapToObj((i) -> {
+             return LandRandomPos.getPos(this, 10 + 2 * i, 3);
+         }).filter(Objects::nonNull).map(BlockPosition::containing).map(BlockPosition::below).filter(this::canDig).findFirst();
+@@ -218,7 +227,7 @@
+         return false;
+     }
+ 
+-    boolean canDig() {
++    public boolean canDig() { // PAIL public
+         return !this.isPanicking() && !this.isBaby() && !this.isInWater() && this.canDig(this.getHeadPosition().below());
+     }
+ 
+@@ -245,6 +254,13 @@
+             BlockPosition blockposition = this.getHeadPosition();
+             EntityItem entityitem = new EntityItem(this.level, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), itemstack);
+ 
++            // CraftBukkit start - handle EntityDropItemEvent
++            org.bukkit.event.entity.EntityDropItemEvent event = new org.bukkit.event.entity.EntityDropItemEvent(this.getBukkitEntity(), (org.bukkit.entity.Item) entityitem.getBukkitEntity());
++            org.bukkit.Bukkit.getPluginManager().callEvent(event);
++            if (event.isCancelled()) {
++                return;
++            }
++            // CraftBukkit end
+             entityitem.setDefaultPickUpDelay();
+             this.level.addFreshEntity(entityitem);
+             this.playSound(SoundEffects.SNIFFER_DROP_SEED, 1.0F, 1.0F);
+@@ -274,15 +290,15 @@
+         return this;
+     }
+ 
+-    private Sniffer storeExploredPosition(BlockPosition blockposition) {
++    public Sniffer storeExploredPosition(BlockPosition blockposition) { // PAIL private -> public
          List<BlockPosition> list = (List) this.getExploredPositions().limit(20L).collect(Collectors.toList());
  
          list.add(0, blockposition);
@@ -33,7 +79,12 @@
          return this;
      }
  
-@@ -416,7 +425,7 @@
+-    private Stream<BlockPosition> getExploredPositions() {
++    public Stream<BlockPosition> getExploredPositions() { // PAIL private -> public
+         return this.getBrain().getMemory(MemoryModuleType.SNIFFER_EXPLORED_POSITIONS).stream().flatMap(Collection::stream);
+     }
+ 
+@@ -416,7 +432,7 @@
  
      @Override
      public BehaviorController<Sniffer> getBrain() {

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftSniffer.java

@@ -1,5 +1,11 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.google.common.base.Preconditions;
+import java.util.Collection;
+import java.util.stream.Collectors;
+import net.minecraft.core.BlockPosition;
+import net.minecraft.world.entity.ai.memory.MemoryModuleType;
+import org.bukkit.Location;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Sniffer;
@@ -24,4 +30,75 @@ public class CraftSniffer extends CraftAnimals implements Sniffer {
     public EntityType getType() {
         return EntityType.SNIFFER;
     }
+
+    @Override
+    public Collection<Location> getExploredLocations() {
+        return this.getHandle().getExploredPositions().map(blockPosition -> new Location(this.getLocation().getWorld(), blockPosition.getX(), blockPosition.getY(), blockPosition.getZ())).collect(Collectors.toList());
+    }
+
+    @Override
+    public void removeExploredLocation(Location location) {
+        Preconditions.checkArgument(location != null, "location cannot be null");
+        if (location.getWorld() != getWorld()) {
+            return;
+        }
+
+        BlockPosition blockPosition = new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ());
+        this.getHandle().getBrain().setMemory(MemoryModuleType.SNIFFER_EXPLORED_POSITIONS, this.getHandle().getExploredPositions().filter(blockPositionExplored -> !blockPositionExplored.equals(blockPosition)).collect(Collectors.toList()));
+    }
+
+    @Override
+    public void addExploredLocation(Location location) {
+        Preconditions.checkArgument(location != null, "location cannot be null");
+        if (location.getWorld() != getWorld()) {
+            return;
+        }
+
+        this.getHandle().storeExploredPosition(new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()));
+    }
+
+    @Override
+    public Sniffer.State getState() {
+        return this.stateToBukkit(this.getHandle().getState());
+    }
+
+    @Override
+    public void setState(Sniffer.State state) {
+        Preconditions.checkArgument(state != null, "state cannot be null");
+        this.getHandle().transitionTo(this.stateToNMS(state));
+    }
+
+    @Override
+    public Location findPossibleDigLocation() {
+        return this.getHandle().calculateDigPosition().map(blockPosition -> new Location(this.getLocation().getWorld(), blockPosition.getX(), blockPosition.getY(), blockPosition.getZ())).orElse(null);
+    }
+
+    @Override
+    public boolean canDig() {
+        return this.getHandle().canDig();
+    }
+
+    private net.minecraft.world.entity.animal.sniffer.Sniffer.a stateToNMS(Sniffer.State state) {
+        return switch (state) {
+            case IDLING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.IDLING;
+            case FEELING_HAPPY -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.FEELING_HAPPY;
+            case SCENTING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.SCENTING;
+            case SNIFFING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.SNIFFING;
+            case SEARCHING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.SEARCHING;
+            case DIGGING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.DIGGING;
+            case RISING -> net.minecraft.world.entity.animal.sniffer.Sniffer.a.RISING;
+        };
+    }
+
+    private Sniffer.State stateToBukkit(net.minecraft.world.entity.animal.sniffer.Sniffer.a state) {
+        return switch (state) {
+            case IDLING -> Sniffer.State.IDLING;
+            case FEELING_HAPPY -> Sniffer.State.FEELING_HAPPY;
+            case SCENTING -> Sniffer.State.SCENTING;
+            case SNIFFING -> Sniffer.State.SNIFFING;
+            case SEARCHING -> Sniffer.State.SEARCHING;
+            case DIGGING -> Sniffer.State.DIGGING;
+            case RISING -> Sniffer.State.RISING;
+        };
+    }
 }