This methods replaces invalid or reserved characters in a directory name. - Java java.lang

Java examples for java.lang:String Replace

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Description

This methods replaces invalid or reserved characters in a directory name.

Demo Code

/**//from   w  ww  . j a va 2 s .c  om
 * 
 * Copyright (C) 2004-2008 FhG Fokus
 *
 * This file is part of the FhG Fokus UPnP stack - an open source UPnP implementation
 * with some additional features
 *
 * You can redistribute the FhG Fokus UPnP stack and/or modify it
 * under the terms of the GNU General Public License Version 3 as published by
 * the Free Software Foundation.
 *
 * For a license to use the FhG Fokus UPnP stack software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact Fraunhofer FOKUS by e-mail at the following
 * addresses:
 *   upnpstack@fokus.fraunhofer.de
 *
 * The FhG Fokus UPnP stack 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>
 * or write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
 
import java.text.DecimalFormat;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Vector;

public class Main{
    public static void main(String[] argv){
        String directoryName = "java2s.com";
        System.out.println(escapeDirectoryName(directoryName));
    }
    final static String VALID_DIRECTORY_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXZY0123456789-_.()";
    /**
     * This methods replaces invalid or reserved characters in a directory name. This should be called when creating
     * directory names from arbitrary strings.
     * 
     * @param directoryName
     *          File name to convert
     * 
     * @return A file name suitable for all operating systems that support % in filenames
     */
    public static String escapeDirectoryName(String directoryName) {
        if (directoryName.length() == 0) {
            return "";
        }

        StringBuffer nameBuffer = new StringBuffer(
                directoryName.length() * 2);

        try {
            byte[] nameData = StringHelper.stringToByteArray(directoryName);

            for (int i = 0; i < nameData.length; i++) {
                int ch = nameData[i] & 0xFF;
                // check for valid characters
                if (VALID_DIRECTORY_CHARS.indexOf(ch) >= 0) {
                    nameBuffer.append((char) ch);
                } else {
                    // invalid character, escape
                    nameBuffer.append('%');
                    // force two digits
                    if (ch < 0x10) {
                        nameBuffer.append('0');
                    }

                    nameBuffer.append(Integer.toHexString(ch));
                }
            }
            return nameBuffer.toString();
        } catch (Exception ex) {
        }
        return null;
    }
    /** Converts a string to a byte array */
    public static byte[] stringToByteArray(String dataString) {
        if (dataString == null) {
            return null;
        }

        byte[] result = new byte[dataString.length()];
        for (int i = 0; i < dataString.length(); i++) {
            result[i] = (byte) dataString.charAt(i);
        }

        return result;
    }
}

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