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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.io;
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();
}
}
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