JAL-3141 Slight efficiency gain in detecting backupfiles in the File Chooser

[jalview.git] / src / jalview / io / JalviewFileFilter.java

diff --git a/src/jalview/io/JalviewFileFilter.java b/src/jalview/io/JalviewFileFilter.java
index 8c6b802..bc20342 100755 (executable)
--- a/src/jalview/io/JalviewFileFilter.java
+++ b/src/jalview/io/JalviewFileFilter.java
@@ -103,10 +103,16 @@ public class JalviewFileFilter extends FileFilter
     if (parentJFC != null && parentJFC.includeBackupFiles)
     {
       Iterator<String> it = filters.keySet().iterator();
-      while (it.hasNext())
+      EXTENSION: while (it.hasNext())
       {
         String ext = it.next();
 
+        // quick negative test
+        if (!f.getName().contains(ext))
+        {
+          continue EXTENSION;
+        }
+
         BackupFilenameParts bfp = BackupFilenameParts
                 .currentBackupFilenameParts(f.getName(), ext, true);
         if (bfp.isBackupFile())