Portal trap check changes (unfinished)

- Cancel existing rescue tasks on successful teleport
- Send the player a message when they are rescued (unfinished)

Someday, I will make this OOP-compliant

src/me/ryanhamshire/GriefPrevention/CheckForPortalTrapTask.java

@@ -23,11 +23,12 @@ import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitRunnable;
 
 //players can be "trapped" in a portal frame if they don't have permission to break
 //solid blocks blocking them from exiting the frame
 //if that happens, we detect the problem and send them back through the portal.
-class CheckForPortalTrapTask implements Runnable 
+class CheckForPortalTrapTask extends BukkitRunnable
 {
 	//player who recently teleported via nether portal 
 	private Player player;
@@ -51,13 +52,14 @@ class CheckForPortalTrapTask implements Runnable
 		//if still standing in a portal frame, teleport him back through
 		if(GriefPrevention.instance.isPlayerTrappedInPortal(playerBlock))
 		{
-			this.player.teleport(this.returnLocation);
+			GriefPrevention.instance.rescuePlayerTrappedInPortal(player, returnLocation);
 		}
 	    
 	    //otherwise, note that he 'escaped' the portal frame
 	    else
 	    {
 	        PlayerEventHandler.portalReturnMap.remove(player.getUniqueId());
+			PlayerEventHandler.portalReturnTaskMap.remove(player.getUniqueId());
 	    }
 	}
 }

src/me/ryanhamshire/GriefPrevention/DataStore.java

@@ -1616,6 +1616,7 @@ public abstract class DataStore
 		this.addDefault(defaults, Messages.ConsoleOnlyCommand, "That command may only be executed from the server console.", null);
 		this.addDefault(defaults, Messages.WorldNotFound, "World not found.", null);
 		this.addDefault(defaults, Messages.TooMuchIpOverlap, "Sorry, there are too many players logged in with your IP address.", null);
+		this.addDefault(defaults, Messages.RescuedFromPortalTrap, "Automatically rescued you from a nether portal. If this was a mistake, use /UndoRescue to return to your prior location.", null);
 		
 		//load the config file
 		FileConfiguration config = YamlConfiguration.loadConfiguration(new File(messagesFilePath));

src/me/ryanhamshire/GriefPrevention/GriefPrevention.java

@@ -3617,7 +3617,7 @@ public class GriefPrevention extends JavaPlugin
 	{
 		Location oldLocation = player.getLocation();
 		player.teleport(returnLocation);
-		sendMessage(player, TextMode.Info, Messages.);
+		sendMessage(player, TextMode.Info, Messages.RescuedFromPortalTrap);
 		return oldLocation;
 	}
 }

src/me/ryanhamshire/GriefPrevention/Messages.java

@@ -247,5 +247,6 @@ public enum Messages
     ConsoleOnlyCommand,
     WorldNotFound,
     AdjustBlocksAllSuccess,
-    TooMuchIpOverlap	
+    TooMuchIpOverlap,
+    RescuedFromPortalTrap
 }

src/me/ryanhamshire/GriefPrevention/PlayerEventHandler.java

@@ -70,6 +70,8 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.metadata.MetadataValue;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.scheduler.BukkitRunnable;
+import org.bukkit.scheduler.BukkitTask;
 import org.bukkit.util.BlockIterator;
 
 class PlayerEventHandler implements Listener 
@@ -766,7 +768,7 @@ class PlayerEventHandler implements Listener
 			Block playerBlock = player.getLocation().getBlock();
 			if(GriefPrevention.instance.isPlayerTrappedInPortal(playerBlock))
             {
-                player.teleport(returnLocation);
+                GriefPrevention.instance.rescuePlayerTrappedInPortal(player, returnLocation);
             }
         }
         
@@ -974,6 +976,7 @@ class PlayerEventHandler implements Listener
 	
 	//remember where players teleport from (via portals) in case they're trapped at the destination
 	static ConcurrentHashMap<UUID, Location> portalReturnMap = new ConcurrentHashMap<UUID, Location>();
+	static ConcurrentHashMap<UUID, BukkitTask> portalReturnTaskMap = new ConcurrentHashMap<UUID, BukkitTask>();
 	
 	//when a player teleports via a portal
 	@EventHandler(ignoreCancelled = true, priority = EventPriority.HIGH)
@@ -990,9 +993,13 @@ class PlayerEventHandler implements Listener
         if(event.getCause() == TeleportCause.NETHER_PORTAL)
         {
             //FEATURE: when players get trapped in a nether portal, send them back through to the other side
-            CheckForPortalTrapTask task = new CheckForPortalTrapTask(player, event.getFrom());
-            GriefPrevention.instance.getServer().getScheduler().scheduleSyncDelayedTask(GriefPrevention.instance, task, 600L);  //after 30 seconds
+			BukkitTask task = new CheckForPortalTrapTask(player, event.getFrom()).runTaskLater(GriefPrevention.instance, 600L);
             portalReturnMap.put(player.getUniqueId(), event.getFrom());
+
+			//Cancel existing rescue task
+			if (portalReturnTaskMap.containsKey(player.getUniqueId()))
+				portalReturnTaskMap.get(player.getUniqueId()).cancel();
+			portalReturnTaskMap.put(player.getUniqueId(), task);
         
             //FEATURE: if the player teleporting doesn't have permission to build a nether portal and none already exists at the destination, cancel the teleportation
             if(GriefPrevention.instance.config_claims_portalsRequirePermission)