Limits roof glass search to a radius of 3 instead of 100

Search was taking too long if there was no glass and timing out the
server.
https://github.com/BentoBoxWorld/Greenhouses/issues/31

src/main/java/world/bentobox/greenhouses/greenhouse/Roof.java

@@ -17,7 +17,7 @@ import org.bukkit.util.Vector;
  */
 public class Roof extends MinMaxXZ {
     private final Location location;
-    private final int height;
+    private int height;
     private boolean roofFound;
 
     /**
@@ -40,6 +40,11 @@ public class Roof extends MinMaxXZ {
      */
     public Roof(Location loc) {
         this.location = loc;
+        roofFound = findRoof(loc);
+    }
+
+
+    private boolean findRoof(Location loc) {
         World world = loc.getWorld();
         // This section tries to find a roof block
         // Try just going up - this covers every case except if the player is standing under a hole
@@ -49,7 +54,7 @@ public class Roof extends MinMaxXZ {
         int roofY = loc.getBlockY();
         // If the roof was not found start going around in circles until something is found
         // Expand in ever increasing squares around location until a wall block is found
-        for (int radius = 0; radius < 100; radius++) {
+        for (int radius = 0; radius < 3; radius++) {
             for (int x = loc.getBlockX() - radius; x <= loc.getBlockX() + radius; x++) {
                 for (int z = loc.getBlockZ() - radius; z <= loc.getBlockZ() + radius; z++) {
                     if (!((x > loc.getBlockX() - radius && x < loc.getBlockX() + radius)
@@ -78,7 +83,7 @@ public class Roof extends MinMaxXZ {
                 break;
             }
         }
-
+        if (!roofFound) return false;
         // Record the height
         this.height = loc.getBlockY();
         // Now we have a roof block, find how far we can go NSWE
@@ -106,9 +111,9 @@ public class Roof extends MinMaxXZ {
             // Repeat until nothing changes
         } while (minx != minX || maxx != maxX || minz != minZ || maxz != maxZ);
         // That's as much as we can do!
+        return true;
     }
 
-
     /**
      * This takes any location and tries to go as far as possible in NWSE directions finding contiguous roof blocks
      * up to 100 in any direction

src/test/java/world/bentobox/greenhouses/greenhouse/RoofTest.java

@@ -76,6 +76,13 @@ public class RoofTest {
         // Test
         roof = new Roof(location);
     }
+    
+    @Test
+    public void testNoGlass() {
+        when(block.getType()).thenReturn(Material.AIR);
+        roof = new Roof(location);
+        
+    }
 
     /**
      * Test method for {@link world.bentobox.greenhouses.greenhouse.Roof#getMinX()}.