API: Claim expiration event.

Cancellable, with GPFlags in mind.

src/me/ryanhamshire/GriefPrevention/CleanupUnusedClaimTask.java

@@ -21,6 +21,10 @@
 import java.util.Calendar;
 import java.util.Vector;
 
+import org.bukkit.Bukkit;
+
+import me.ryanhamshire.GriefPrevention.events.ClaimExpirationEvent;
+
 class CleanupUnusedClaimTask implements Runnable 
 {	
     Claim claim;
@@ -35,6 +39,11 @@ class CleanupUnusedClaimTask implements Runnable
 	@Override
 	public void run()
 	{
+		//see if any other plugins don't want this claim deleted
+	    ClaimExpirationEvent event = new ClaimExpirationEvent(this.claim);
+	    Bukkit.getPluginManager().callEvent(event);
+	    if(event.isCancelled()) return;
+	    
 	    //determine area of the default chest claim
 		int areaOfDefaultClaim = 0;
 		if(GriefPrevention.instance.config_claims_automaticClaimsForNewPlayersRadius >= 0)

src/me/ryanhamshire/GriefPrevention/events/ClaimExpirationEvent.java

@@ -0,0 +1,49 @@
+package me.ryanhamshire.GriefPrevention.events;
+
+import me.ryanhamshire.GriefPrevention.Claim;
+
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+//if cancelled, the claim will not be deleted
+public class ClaimExpirationEvent extends Event implements Cancellable
+{
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled = false;
+    
+    public static HandlerList getHandlerList()
+    {
+        return handlers;
+    }
+
+    Claim claim;
+
+    public ClaimExpirationEvent(Claim claim)
+    {
+        this.claim = claim;
+    }
+
+    public Claim getClaim()
+    {
+        return this.claim;
+    }
+
+    @Override
+    public HandlerList getHandlers()
+    {
+        return handlers;
+    }
+    
+    @Override
+    public boolean isCancelled()
+    {
+        return this.cancelled;
+    }
+    
+    @Override
+    public void setCancelled(boolean cancelled)
+    {
+        this.cancelled = cancelled;
+    }
+}