/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common;
import java.util.Random;
public class UUIDs {
private static final RandomBasedUUIDGenerator RANDOM_UUID_GENERATOR = new RandomBasedUUIDGenerator();
private static final UUIDGenerator TIME_UUID_GENERATOR = new TimeBasedUUIDGenerator();
/** Generates a time-based UUID (similar to Flake IDs), which is preferred when generating an ID to be indexed into a Lucene index as
* primary key. The id is opaque and the implementation is free to change at any time! */
public static String base64UUID() {
return TIME_UUID_GENERATOR.getBase64UUID();
}
/** Returns a Base64 encoded version of a Version 4.0 compatible UUID as defined here: http://www.ietf.org/rfc/rfc4122.txt, using the
* provided {@code Random} instance */
public static String randomBase64UUID(Random random) {
return RANDOM_UUID_GENERATOR.getBase64UUID(random);
}
/** Returns a Base64 encoded version of a Version 4.0 compatible UUID as defined here: http://www.ietf.org/rfc/rfc4122.txt, using a
* private {@code SecureRandom} instance */
public static String randomBase64UUID() {
return RANDOM_UUID_GENERATOR.getBase64UUID();
}
}