Rather than forcing a rebuild of our tileset and component bundles every time when we're deploying to a directory bundle, decide based on the oldest modification time stamp of any file within the directory. Otherwise, these builds get crazy long.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@347 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/util/FileUtil.java

@@ -0,0 +1,43 @@
+//
+// $Id$
+//
+// Nenya library - tools for developing networked games
+// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/nenya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.util;
+
+import java.io.File;
+
+public class FileUtil
+{
+    /**
+     * Returns the timestamp of the oldest modification date of any file within the directory.
+     */
+    public static long getOldestLastModified (File dir)
+    {
+        long oldest = dir.lastModified();
+        for (File file : dir.listFiles()) {
+            if (file.isDirectory()) {
+                oldest = Math.min(oldest, getOldestLastModified(file));
+            } else {
+                oldest = Math.min(oldest, file.lastModified());
+            }
+        }
+        return oldest;
+    }
+}