From 7e47ab746ef588648b8edbbc7cfb48c4d90c5e34 Mon Sep 17 00:00:00 2001
From: Marck
Date: Fri, 6 Aug 2010 07:46:19 +0200
Subject: Allow creation of link regions if there is an existing region within
 a 4096 range.

Also add GetHyperlinks() to the grid service.
---
 OpenSim/Services/GridService/GridService.cs     | 16 ++++++++++++
 OpenSim/Services/GridService/HypergridLinker.cs | 34 ++++++++++++++++++++++---
 2 files changed, 46 insertions(+), 4 deletions(-)

(limited to 'OpenSim/Services/GridService')

diff --git a/OpenSim/Services/GridService/GridService.cs b/OpenSim/Services/GridService/GridService.cs
index ebaed42..79a45fe 100644
--- a/OpenSim/Services/GridService/GridService.cs
+++ b/OpenSim/Services/GridService/GridService.cs
@@ -426,6 +426,22 @@ namespace OpenSim.Services.GridService
             return ret;
         }
 
+        public List<GridRegion> GetHyperlinks(UUID scopeID)
+        {
+            List<GridRegion> ret = new List<GridRegion>();
+
+            List<RegionData> regions = m_Database.GetHyperlinks(scopeID);
+
+            foreach (RegionData r in regions)
+            {
+                if ((Convert.ToInt32(r.Data["flags"]) & (int)OpenSim.Data.RegionFlags.RegionOnline) != 0)
+                    ret.Add(RegionData2RegionInfo(r));
+            }
+
+            m_log.DebugFormat("[GRID SERVICE]: Hyperlinks returned {0} regions", ret.Count);
+            return ret;
+        }
+        
         public int GetRegionFlags(UUID scopeID, UUID regionID)
         {
             RegionData region = m_Database.Get(regionID, scopeID);
diff --git a/OpenSim/Services/GridService/HypergridLinker.cs b/OpenSim/Services/GridService/HypergridLinker.cs
index 1f53007..017df41 100644
--- a/OpenSim/Services/GridService/HypergridLinker.cs
+++ b/OpenSim/Services/GridService/HypergridLinker.cs
@@ -27,6 +27,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net;
 using System.Reflection;
 using System.Xml;
@@ -332,18 +333,43 @@ namespace OpenSim.Services.GridService
         /// <returns></returns>
         public bool Check4096(ulong realHandle, out uint x, out uint y)
         {
-            GridRegion defRegion = DefaultRegion;
-
             uint ux = 0, uy = 0;
             Utils.LongToUInts(realHandle, out ux, out uy);
             x = ux / Constants.RegionSize;
             y = uy / Constants.RegionSize;
 
-            if ((Math.Abs((int)defRegion.RegionLocX - ux) >= 4096 * Constants.RegionSize) ||
-                (Math.Abs((int)defRegion.RegionLocY - uy) >= 4096 * Constants.RegionSize))
+            const uint limit = (4096 - 1) * Constants.RegionSize;
+            uint xmin = ux - limit;
+            uint xmax = ux + limit;
+            uint ymin = uy - limit;
+            uint ymax = uy + limit;
+            // World map boundary checks
+            if (xmin < 0 || xmin > ux)
+                xmin = 0;
+            if (xmax > int.MaxValue || xmax < ux)
+                xmax = int.MaxValue;
+            if (ymin < 0 || ymin > uy)
+                ymin = 0;
+            if (ymax > int.MaxValue || ymax < uy)
+                ymax = int.MaxValue;
+
+            // Check for any regions that are within the possible teleport range to the linked region
+            List<GridRegion> regions = m_GridService.GetRegionRange(m_ScopeID, (int)xmin, (int)xmax, (int)ymin, (int)ymax);
+            if (regions.Count == 0)
+            {
+                return false;
+            }
+            else
+            {
+                // Check for regions which are not linked regions
+                List<GridRegion> hyperlinks = m_GridService.GetHyperlinks(m_ScopeID);
+                IEnumerable<GridRegion> availableRegions = regions.Except(hyperlinks);
+                if (availableRegions.Count() == 0)
             {
                 return false;
             }
+            }
+
             return true;
         }
 
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