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git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/branches/JOGL_2_SANDBOX@1872 232f8b59-042b-4e1e-8c03-345bb8c30851

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diff --git a/src/jogl/classes/com/sun/opengl/util/FileUtil.java b/src/jogl/classes/com/sun/opengl/util/FileUtil.java
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+/*
+ * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.opengl.util;
+
+import java.io.*;
+
+/** Utilities for dealing with files. */
+
+public class FileUtil {
+    private FileUtil() {}
+
+    /**
+     * Returns the lowercase suffix of the given file name (the text
+     * after the last '.' in the file name). Returns null if the file
+     * name has no suffix. Only operates on the given file name;
+     * performs no I/O operations.
+     *
+     * @param file name of the file
+     * @return lowercase suffix of the file name
+     * @throws NullPointerException if file is null
+     */
+
+    public static String getFileSuffix(File file) {
+        return getFileSuffix(file.getName());
+    }
+
+    /**
+     * Returns the lowercase suffix of the given file name (the text
+     * after the last '.' in the file name). Returns null if the file
+     * name has no suffix. Only operates on the given file name;
+     * performs no I/O operations.
+     *
+     * @param filename name of the file
+     * @return lowercase suffix of the file name
+     * @throws NullPointerException if filename is null
+     */
+    public static String getFileSuffix(String filename) {
+        int lastDot = filename.lastIndexOf('.');
+        if (lastDot < 0) {
+            return null;
+        }
+        return toLowerCase(filename.substring(lastDot + 1));
+    }
+
+    private static String toLowerCase(String arg) {
+        if (arg == null) {
+            return null;
+        }
+
+        return arg.toLowerCase();
+    }
+}