fileutils.java

非常好用的代码源代码统计分析工具的源代码

/*
 * FileUtils.java - a class for usefull functions on files.
 * Copyright (C) 2003-2004 Rob Spoor
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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 nl.icemanx.io;

import java.io.*;
import java.util.*;

/**
 * FileUtils contains several usefull functions on strings.
 *
 * @author  Rob Spoor
 * @version 0.3, 2003-12-29
 */
public class FileUtils
{
    /**
     * Private constructor to prevent creation of instances.
     */
    private FileUtils()
    {
    }

    /**
     * Returns a list with the full filenames of all files in the directory.
     *
     * @param start The directory to start in.
     * @param filter The filefilter to use.
     * @param recurse Whether or not to recurse.
     * @return A list with all full filenames.
     * @throws IOException If <tt>start</tt> is not a directory.
     */
    public static List getFiles(File start, FileFilter filter,
                                boolean recurse) throws IOException
    {
        if (!start.isDirectory())
        {
            throw new IOException("No directory: " + start.getAbsolutePath());
        }
        List files = new ArrayList();
        File[] list = start.listFiles(filter);
        for (int i = 0; i < list.length; i++)
        {
            if (list[i].isFile())
            {
                files.add(list[i].getAbsolutePath());
            }
            else if (recurse && list[i].isDirectory())
            {
                files.addAll(getFiles(list[i], filter, recurse));
            }
        }
        return files;
    }

    /**
     * @param file The file to get the extension of.
     * @return The extension of the given file.
     * @since 0.3
     */
    public static String getExtension(File file)
    {
        String name = file.getName();
        int index = name.lastIndexOf(".");
        if (index != -1)
        {
            return name.substring(index+1);
        }
        return "";
    }
}