org.apache.iotdb.session.subscription.util.RandomStringGenerator Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.iotdb.session.subscription.util;
import java.security.SecureRandom;
public class RandomStringGenerator {
private static final String CHARACTERS =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
private static final SecureRandom RANDOM = new SecureRandom();
public static String generate(final int length) {
final StringBuilder sb = new StringBuilder(length);
for (int i = 0; i < length; i++) {
sb.append(CHARACTERS.charAt(RANDOM.nextInt(CHARACTERS.length())));
}
return sb.toString();
}
}