UUIDConverter.java

/**
 * Copyright © 2016-2017 The Thingsboard Authors
 *
 * 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 org.thingsboard.server.common.data;

import java.util.List;
import java.util.UUID;
import java.util.stream.Collectors;

/**
 * Created by ashvayka on 13.07.17.
 */
public class UUIDConverter {

    public static UUID fromString(String src) {
        return UUID.fromString(src.substring(7, 15) + "-" + src.substring(3, 7) + "-1"
                + src.substring(0, 3) + "-" + src.substring(15, 19) + "-" + src.substring(19));
    }

    public static String fromTimeUUID(UUID src) {
        if (src.version() != 1) {
            throw new IllegalArgumentException("Only Time-Based UUID (Version 1) is supported!");
        }
        String str = src.toString();
        // 58e0a7d7-eebc-11d8-9669-0800200c9a66 => 1d8eebc58e0a7d796690800200c9a66. Note that [11d8] -> [1d8]
        return str.substring(15, 18) + str.substring(9, 13) + str.substring(0, 8) + str.substring(19, 23) + str.substring(24);
    }

    public static List<String> fromTimeUUIDs(List<UUID> uuids) {
        if (uuids == null) {
            return null;
        }
        return uuids.stream().map(UUIDConverter::fromTimeUUID).collect(Collectors.toList());
    }

}