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The TwelveMonkeys Core library. Contains common utility classes.
There is a newer version: 2.3
/*
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions 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 "TwelveMonkeys" nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.io;

import java.io.File;
import java.io.BufferedReader;
import java.io.IOException;

/**
 * WindowsFileSystem
 * 
 *
 * @author Harald Kuhr
 * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/io/Win32FileSystem.java#1 $
 */
final class Win32FileSystem extends FileSystem {
    public long getFreeSpace(File pPath) {
        try {
            // Windows version
            // TODO: Test on W2K/95/98/etc...
            BufferedReader reader = exec(new String[] {"CMD.EXE", "/C", "DIR", "/-C", pPath.getAbsolutePath()});

            String last = null;
            String line;
            try {
                while ((line = reader.readLine()) != null) {
                    last = line;
                }
            }
            finally {
                FileUtil.close(reader);
            }

            if (last != null) {
                int end = last.lastIndexOf(" bytes free");
                int start = last.lastIndexOf(' ', end - 1);

                if (start >= 0 && end >= 0) {
                    try {
                        return Long.parseLong(last.substring(start + 1, end));
                    }
                    catch (NumberFormatException ignore) {
                        // Ignore
                    }
                }
            }
        }
        catch (IOException ignore) {
            // Ignore
        }

        return 0l;
    }

    long getTotalSpace(File pPath) {
        // TODO: Implement, probably need some JNI stuff...
        // Distribute df.exe and execute from temp!? ;-)
        return getFreeSpace(pPath);
    }

    String getName() {
        return "Win32";
    }
}