2 * ================================================================================
3 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 * ============LICENSE_END=========================================================
20 package org.onap.dcae.analytics.model.util.supplier;
22 import java.util.Locale;
23 import java.util.Random;
24 import java.util.function.Supplier;
27 * Supplies unsecured random ID with upper case with desired maximum length.
29 * @author Rajiv Singla
31 public class RandomIdSupplier implements Supplier<String> {
33 private static final char[] LETTERS =
34 "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
35 private static final Random RANDOM = new Random();
37 private final int maxLength;
39 public RandomIdSupplier(int maxLength) {
40 this.maxLength = maxLength;
47 final StringBuilder sb = new StringBuilder(maxLength);
48 for (int i = 0; i < maxLength; i++) {
49 sb.append(LETTERS[RANDOM.nextInt(LETTERS.length)]);
52 return sb.toString().toUpperCase(Locale.getDefault());