SPIGOT-4372: LightningStrikeEvent cause API

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/event/weather/LightningStrikeEvent.java

@@ -12,10 +12,17 @@ public class LightningStrikeEvent extends WeatherEvent implements Cancellable {
     private static final HandlerList handlers = new HandlerList();
     private boolean canceled;
     private final LightningStrike bolt;
+    private final Cause cause;
 
+    @Deprecated
     public LightningStrikeEvent(final World world, final LightningStrike bolt) {
+        this(world, bolt, Cause.UNKNOWN);
+    }
+
+    public LightningStrikeEvent(final World world, final LightningStrike bolt, final Cause cause) {
         super(world);
         this.bolt = bolt;
+        this.cause = cause;
     }
 
     public boolean isCancelled() {
@@ -35,6 +42,15 @@ public class LightningStrikeEvent extends WeatherEvent implements Cancellable {
         return bolt;
     }
 
+    /**
+     * Gets the cause of this lightning strike.
+     *
+     * @return strike cause
+     */
+    public Cause getCause() {
+        return cause;
+    }
+
     @Override
     public HandlerList getHandlers() {
         return handlers;
@@ -43,4 +59,27 @@ public class LightningStrikeEvent extends WeatherEvent implements Cancellable {
     public static HandlerList getHandlerList() {
         return handlers;
     }
+
+    public enum Cause {
+        /**
+         * Triggered by the /summon command.
+         */
+        COMMAND,
+        /**
+         * Triggered by an enchanted trident.
+         */
+        TRIDENT,
+        /**
+         * Triggered by a skeleton horse trap.
+         */
+        TRAP,
+        /**
+         * Triggered by weather.
+         */
+        WEATHER,
+        /**
+         * Unknown trigger.
+         */
+        UNKNOWN;
+    }
 }