Strings.java Source code

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Here is the source code for Strings.java

Source

/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
    
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
    
This library 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
Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    
Contact info: lobochief@users.sourceforge.net
*/

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;

public class Strings {
    private static final MessageDigest MESSAGE_DIGEST;
    public static final String[] EMPTY_ARRAY = new String[0];

    static {
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException err) {
            throw new IllegalStateException();
        }
        MESSAGE_DIGEST = md;
    }
    private static final String HEX_CHARS = "0123456789ABCDEF";

    public static String getMD5(String source) {
        byte[] bytes;
        try {
            bytes = source.getBytes("UTF-8");
        } catch (java.io.UnsupportedEncodingException ue) {
            throw new IllegalStateException(ue);
        }
        byte[] result;
        synchronized (MESSAGE_DIGEST) {
            MESSAGE_DIGEST.update(bytes);
            result = MESSAGE_DIGEST.digest();
        }
        char[] resChars = new char[32];
        int len = result.length;
        for (int i = 0; i < len; i++) {
            byte b = result[i];
            int lo4 = b & 0x0F;
            int hi4 = (b & 0xF0) >> 4;
            resChars[i * 2] = HEX_CHARS.charAt(hi4);
            resChars[i * 2 + 1] = HEX_CHARS.charAt(lo4);
        }
        return new String(resChars);
    }

    public static String getHash32(String source) throws UnsupportedEncodingException {
        String md5 = getMD5(source);
        return md5.substring(0, 8);
    }

    public static String getHash64(String source) throws UnsupportedEncodingException {
        String md5 = getMD5(source);
        return md5.substring(0, 16);
    }

}