Add EntityPortalReadyEvent

paper-api/src/main/java/io/papermc/paper/event/entity/EntityPortalReadyEvent.java

@@ -0,0 +1,95 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.PortalType;
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.event.entity.EntityPortalEvent;
+import org.bukkit.event.player.PlayerPortalEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Called when an entity is ready to be teleported by a plugin.
+ * Currently, this is only called after the required
+ * ticks have passed for a Nether Portal.
+ * <p>
+ * Cancelling this event resets the entity's readiness
+ * regarding the current portal.
+ */
+@NullMarked
+public class EntityPortalReadyEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final PortalType portalType;
+    private @Nullable World targetWorld;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public EntityPortalReadyEvent(final Entity entity, final @Nullable World targetWorld, final PortalType portalType) {
+        super(entity);
+        this.targetWorld = targetWorld;
+        this.portalType = portalType;
+    }
+
+    /**
+     * Gets the world this portal will teleport to.
+     * Can be {@code null} if "allow-nether" is false in server.properties
+     * or if there is another situation where there is no world to teleport to.
+     * <p>
+     * This world may be modified by later events such as {@link PlayerPortalEvent}
+     * or {@link EntityPortalEvent}.
+     *
+     * @return the world the portal will teleport the entity to.
+     */
+    public @Nullable World getTargetWorld() {
+        return this.targetWorld;
+    }
+
+    /**
+     * Sets the world this portal will teleport to. A {@code null} value
+     * will essentially cancel the teleport and prevent further events
+     * such as {@link PlayerPortalEvent} from firing.
+     * <p>
+     * This world may be modified by later events such as {@link PlayerPortalEvent}
+     * or {@link EntityPortalEvent}.
+     *
+     * @param targetWorld the world
+     */
+    public void setTargetWorld(final @Nullable World targetWorld) {
+        this.targetWorld = targetWorld;
+    }
+
+    /**
+     * Gets the portal type for this event.
+     *
+     * @return the portal type
+     */
+    public PortalType getPortalType() {
+        return this.portalType;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}