com.agapsys.web.toolkit.utils.StringUtils Maven / Gradle / Ivy

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/*
 * Copyright 2015-2016 Agapsys Tecnologia Ltda-ME.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.agapsys.web.toolkit.utils;

import java.util.Random;

public class StringUtils {

    protected StringUtils() {}

    public static String getRandom(int length) {
        char[] chars = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
        return getRandom(length, chars);
    }

    public static String getRandom(int length, char[] chars)  {
        if (length < 1) throw new IllegalArgumentException("Invalid length: " + length);

        if (chars == null || chars.length == 0) throw new IllegalArgumentException("Null/Empty chars");

        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            char c = chars[random.nextInt(chars.length)];
            sb.append(c);
        }

        return sb.toString();
    }
    
}