add enderpearl, equipment and potion effect events

src/main/java/lol/vera/spigot/event/EquipmentSetEvent.java

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+package lol.vera.spigot.event;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.bukkit.inventory.ItemStack;
+
+@Getter
+@RequiredArgsConstructor
+public class EquipmentSetEvent extends Event {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    private final HumanEntity humanEntity;
+    private final int slot;
+    private final ItemStack previousItem;
+    private final ItemStack newItem;
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}

src/main/java/lol/vera/spigot/event/PlayerPearlRefundEvent.java

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+package lol.vera.spigot.event;
+
+import lombok.*;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+@Data
+@RequiredArgsConstructor
+@EqualsAndHashCode(callSuper = true)
+public class PlayerPearlRefundEvent extends Event implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    private final Player player;
+    private boolean cancelled;
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}

src/main/java/lol/vera/spigot/event/potion/PotionEffectAddEvent.java

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+package lol.vera.spigot.event.potion;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.potion.PotionEffect;
+
+/**
+ * Called when a potion effect is applied to an entity, or an existing effect is extended or upgraded
+ */
+
+@Getter
+@Setter
+public class PotionEffectAddEvent extends PotionEffectEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    private boolean cancelled;
+    private final EffectAddReason reason;
+
+    public PotionEffectAddEvent(LivingEntity what, PotionEffect effect, EffectAddReason reason) {
+        super(what, effect);
+        this.reason = reason;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+    public enum EffectAddReason {
+        /**
+         * Added using the /effect command
+         */
+        COMMAND,
+        /**
+         * Added by eating a golden apple
+         */
+        GOLDEN_APPLE,
+        /**
+         * Added by being near a beacon
+         */
+        BEACON,
+        /**
+         * Added by being hit with a wither skull
+         */
+        WITHER_SKULL,
+        /**
+         * Added by being hit by a wither skeleton
+         */
+        WITHER_SKELETON,
+        /**
+         * Added to villagers when they are cured
+         */
+        VILLAGER_CURE,
+        /**
+         * Added to villagers when they unlock a new set of trades
+         */
+        VILLAGER_LEVELUP,
+        /**
+         * Added to spiders on higher difficulty
+         */
+        SPIDER_POWERUP,
+        /**
+         * Added when a potion is splashed
+         */
+        POTION_SPLASH,
+        /**
+         * Added when a potion is consumed
+         */
+        POTION_DRINK,
+        /**
+         * Added by a plugin
+         */
+        CUSTOM,
+        /**
+         * Added by a part of the vanilla code not covered in the above cases
+         */
+        UNKNOWN
+    }
+
+}

src/main/java/lol/vera/spigot/event/potion/PotionEffectEvent.java

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+package lol.vera.spigot.event.potion;
+
+import lombok.Getter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.potion.PotionEffect;
+
+@Getter
+public abstract class PotionEffectEvent extends EntityEvent {
+
+    private final PotionEffect effect;
+
+    public PotionEffectEvent(LivingEntity what, PotionEffect effect) {
+        super(what);
+        this.effect = effect;
+    }
+
+    @Override
+    public LivingEntity getEntity() {
+        return (LivingEntity) super.getEntity();
+    }
+
+}

src/main/java/lol/vera/spigot/event/potion/PotionEffectExpireEvent.java

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+package lol.vera.spigot.event.potion;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.potion.PotionEffect;
+
+/**
+ * Called when a potion effect on an entity runs out. Cancelling the event extends
+ * the effect with a practically infinite duration. The new duration can also be set
+ * explicitly by calling {@link #setDuration}.
+ *
+ * Handlers of {@link PotionEffectRemoveEvent} will also receive this event.
+ */
+
+@Getter @Setter
+public class PotionEffectExpireEvent extends PotionEffectRemoveEvent {
+
+    private int duration = 0;
+
+    public PotionEffectExpireEvent(LivingEntity entity, PotionEffect effect) {
+        super(entity, effect);
+    }
+
+    /**
+     * Set a new duration for the potion effect. Passing 0 to this method un-cancels
+     * the event, and passing anything above 0 cancels it.
+     */
+    public void setDuration(int duration) {
+        this.duration = Math.max(0, duration);
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return duration > 0;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.duration = cancel ? Integer.MAX_VALUE : 0;
+    }
+
+}

src/main/java/lol/vera/spigot/event/potion/PotionEffectExtendEvent.java

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+package lol.vera.spigot.event.potion;
+
+import lombok.Getter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.potion.PotionEffect;
+
+/**
+ * Called when an entity's active potion effect is extended or upgraded.
+ *
+ * Handlers of {@link PotionEffectAddEvent} will also receive this event.
+ */
+
+@Getter
+public class PotionEffectExtendEvent extends PotionEffectAddEvent {
+
+    private final PotionEffect oldEffect;
+
+    public PotionEffectExtendEvent(LivingEntity what, PotionEffect effect, EffectAddReason reason, PotionEffect oldEffect) {
+        super(what, effect, reason);
+        this.oldEffect = oldEffect;
+    }
+
+}

src/main/java/lol/vera/spigot/event/potion/PotionEffectRemoveEvent.java

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+package lol.vera.spigot.event.potion;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.potion.PotionEffect;
+
+/**
+ * Called when a potion effect is removed from an entity for whatever reason
+ */
+
+@Getter @Setter
+public class PotionEffectRemoveEvent extends PotionEffectEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+
+    public PotionEffectRemoveEvent(LivingEntity entity, PotionEffect effect) {
+        super(entity, effect);
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}