Util.java

/*
 * Copyright (C) 2005-2012 NAUMEN. All rights reserved.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 */
package ru.naumen.servacc.util;

import java.security.SecureRandom;
import java.util.regex.Pattern;

public final class Util
{
    private Util()
    {
        // Utility class should not have public constructor
    }

    public static boolean isEmptyOrNull(String str)
    {
        return str == null || str.trim().length() == 0;
    }

    public static boolean matches(String string, String filter)
    {
        String regexp = "(?iu).*" + Pattern.quote(filter) + ".*";
        return string.matches(regexp);
    }
    
    public static String generateRandomString(String alphabet, int length)
    {
        StringBuilder sb = new StringBuilder(length);
        SecureRandom rnd = new SecureRandom();
        for(int i = 0; i < length; i++)
        {
           sb.append(alphabet.charAt(rnd.nextInt(alphabet.length())));
        }
        return sb.toString();
    }
}