X-Git-Url: https://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=tim%2Fprune%2Fgui%2Fmap%2FOsmMapSource.java;h=2f8d0ba97980c366ebaf824a515c0912e12f2174;hp=09def4597eb72977357930b9ea492c1c9d198a45;hb=4d5796d02a15808311c09448d79e6e7d1de9d636;hpb=f1b92378a792131ac8fb33a869405851d5b2d1f7

diff --git a/tim/prune/gui/map/OsmMapSource.java b/tim/prune/gui/map/OsmMapSource.java
index 09def45..2f8d0ba 100644
--- a/tim/prune/gui/map/OsmMapSource.java
+++ b/tim/prune/gui/map/OsmMapSource.java
@@ -1,5 +1,6 @@
 package tim.prune.gui.map;
 
+import java.util.regex.Matcher;
 import tim.prune.I18nManager;
 
 /**
@@ -145,7 +146,9 @@ public class OsmMapSource extends MapSource
 	 */
 	public String makeURL(int inLayerNum, int inZoom, int inX, int inY)
 	{
-		return _baseUrls[inLayerNum] + inZoom + "/" + inX + "/" + inY + "." + getFileExtension(inLayerNum);
+		// Check if the base url has a [1234], if so replace at random
+		return pickServerUrl(_baseUrls[inLayerNum])
+			+ inZoom + "/" + inX + "/" + inY + "." + getFileExtension(inLayerNum);
 	}
 
 	/**
@@ -156,6 +159,35 @@ public class OsmMapSource extends MapSource
 		return _maxZoom;
 	}
 
+	/**
+	 * If the base url contains something like [1234], then pick a server
+	 * @param inBaseUrl base url
+	 * @return modified base url
+	 */
+	protected static final String pickServerUrl(String inBaseUrl)
+	{
+		if (inBaseUrl == null || inBaseUrl.indexOf('[') < 0) {
+			return inBaseUrl;
+		}
+		// Check for [.*] (once only)
+		// Only need to support one, make things a bit easier
+		final Matcher matcher = WILD_PATTERN.matcher(inBaseUrl);
+		// if not, return base url unchanged
+		if (!matcher.matches()) {
+			return inBaseUrl;
+		}
+		// if so, pick one at random and replace in the String
+		final String match = matcher.group(2);
+		final int numMatches = match.length();
+		String server = null;
+		if (numMatches > 0)
+		{
+			int matchNum = (int) Math.floor(Math.random() * numMatches);
+			server = "" + match.charAt(matchNum);
+		}
+		final String result = matcher.group(1) + (server==null?"":server) + matcher.group(3);
+		return result;
+	}
 
 	/**
 	 * @return semicolon-separated list of all fields