/*
* Licensed to DuraSpace under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership.
*
* DuraSpace 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.fcrepo.kernel.api.services.functions;
import static java.util.UUID.randomUUID;
import java.util.stream.IntStream;
import java.util.StringJoiner;
/**
* Unique value minter that creates hierarchical IDs from a UUID
*
* @author awoods
* @author acoburn
*/
public interface HierarchicalIdentifierSupplier extends UniqueValueSupplier {
static final int DEFAULT_LENGTH = 2;
static final int DEFAULT_COUNT = 4;
/**
* Mint a unique identifier as a UUID
*
* @return uuid
*/
@Override
default public String get() {
final String s = randomUUID().toString();
final StringJoiner joiner = new StringJoiner("/", "", "/" + s);
IntStream.rangeClosed(0, DEFAULT_COUNT - 1)
.forEach(x -> joiner.add(s.substring(x * DEFAULT_LENGTH, (x + 1) * DEFAULT_LENGTH)));
return joiner.toString();
}
}