[Bleeding] Added PotionSplashEvent for splash potions. Closes BUKKIT-307

By: Zeerix <zeerix@draig.de>

paper-api/src/main/java/org/bukkit/event/Event.java

@@ -795,6 +795,12 @@ public abstract class Event implements Serializable {
          * @see org.bukkit.event.entity.ProjectileHitEvent
          */
         PROJECTILE_HIT(Category.ENTITY, ProjectileHitEvent.class),
+        /**
+         * Called when a splash potion hits an area
+         *
+         * @see org.bukkit.event.entity.PotionSplashEvent
+         */
+        POTION_SPLASH(Category.ENTITY, PotionSplashEvent.class),
         /**
          * Called when a Slime splits into smaller Slimes upon death
          *

paper-api/src/main/java/org/bukkit/event/entity/PotionSplashEvent.java

@@ -0,0 +1,89 @@
+package org.bukkit.event.entity;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.ThrownPotion;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+/**
+ * Called when a splash potion hits an area
+ */
+@SuppressWarnings("serial")
+public class PotionSplashEvent extends ProjectileHitEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    private Map<LivingEntity, Double> affectedEntities;
+
+    public PotionSplashEvent(ThrownPotion potion, Map<LivingEntity, Double> affectedEntities) {
+        super(Type.POTION_SPLASH, potion);
+
+        this.affectedEntities = affectedEntities;
+    }
+
+    /**
+     * Gets the potion which caused this event
+     *
+     * @return The thrown potion entity
+     */
+    public ThrownPotion getPotion() {
+        return (ThrownPotion) getEntity();
+    }
+
+    /**
+     * Retrieves a list of all effected entities
+     *
+     * @return A fresh copy of the affected entity list
+     */
+    public Collection<LivingEntity> getAffectedEntities() {
+        return new ArrayList<LivingEntity>(affectedEntities.keySet());
+    }
+
+    /**
+     * Gets the intensity of the potion's effects for given entity;
+     * This depends on the distance to the impact center
+     *
+     * @param entity Which entity to get intensity for
+     * @return intensity relative to maximum effect; 0.0: not affected; 1.0: fully hit by potion effects
+     */
+    public double getIntensity(LivingEntity entity) {
+        Double intensity = affectedEntities.get(entity);
+        return intensity != null ? intensity : 0.0;
+    }
+
+    /**
+     * Overwrites the intensity for a given entity
+     *
+     * @param entity For which entity to define a new intensity
+     * @param intensity relative to maximum effect
+     */
+    public void setIntensity(LivingEntity entity, double intensity) {
+        Validate.notNull(entity, "You must specify a valid entity.");
+        if (intensity <= 0.0) {
+            affectedEntities.remove(entity);
+        } else {
+            affectedEntities.put(entity, Math.min(intensity, 1.0));
+        }
+    }
+
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    public void setCancelled(boolean cancel) {
+        cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}

paper-api/src/main/java/org/bukkit/event/entity/ProjectileHitEvent.java

@@ -14,6 +14,10 @@ public class ProjectileHitEvent extends EntityEvent {
         super(Type.PROJECTILE_HIT, projectile);
     }
 
+    public ProjectileHitEvent(Type type, Projectile projectile) {
+        super(type, projectile);
+    }
+
     @Override
     public HandlerList getHandlers() {
         return handlers;