1.1 --- a/openide.util/test/unit/src/org/openide/util/test/TestFileUtils.java	Sun Sep 27 13:25:11 2009 -0400
     1.2 +++ b/openide.util/test/unit/src/org/openide/util/test/TestFileUtils.java	Tue Sep 29 10:20:39 2009 -0400
     1.3 @@ -53,6 +53,7 @@
     1.4  import java.util.zip.CRC32;
     1.5  import java.util.zip.ZipEntry;
     1.6  import java.util.zip.ZipOutputStream;
     1.7 +import junit.framework.Assert;
     1.8  
     1.9  /**
    1.10   * Common utility methods for massaging and inspecting files from tests.
    1.11 @@ -146,4 +147,24 @@
    1.12          os.close();
    1.13      }
    1.14  
    1.15 +    /**
    1.16 +     * Make sure the timestamp on a file changes.
    1.17 +     * @param f a file to touch (make newer)
    1.18 +     * @param ref if not null, make f newer than this file; else make f newer than it was before
    1.19 +     */
    1.20 +    public static void touch(File f, File ref) throws IOException, InterruptedException {
    1.21 +        long older = f.lastModified();
    1.22 +        if (ref != null) {
    1.23 +            older = Math.max(older, ref.lastModified());
    1.24 +        }
    1.25 +        for (long pause = 1; pause < 9999; pause *= 2) {
    1.26 +            Thread.sleep(pause);
    1.27 +            f.setLastModified(System.currentTimeMillis());
    1.28 +            if (f.lastModified() > older) {
    1.29 +                return;
    1.30 +            }
    1.31 +        }
    1.32 +        Assert.fail("Did not manage to touch " + f);
    1.33 +    }
    1.34 +
    1.35  }