--- a/src/org/tmatesoft/hg/repo/HgInternals.java	Tue Feb 22 15:49:26 2011 +0100
+++ b/src/org/tmatesoft/hg/repo/HgInternals.java	Wed Feb 23 22:36:28 2011 +0100
@@ -16,6 +16,8 @@
  */
 package org.tmatesoft.hg.repo;
 
+import static org.tmatesoft.hg.repo.HgRepository.*;
+
 import java.io.File;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
@@ -84,4 +86,9 @@
 			return username;
 		}
 	}
+
+	// Convenient check of local revision number for validity (not all negative values are wrong as long as we use negative constants)
+	public static boolean wrongLocalRevision(int rev) {
+		return rev < 0 && rev != TIP && rev != WORKING_COPY && rev != BAD_REVISION; 
+	}
 }