ru.ilb.common.jpa.converters.UUIDConverterBytes Maven / Gradle / Ivy

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/*
 * Copyright 2016 Bystrobank
 *
 * 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 ru.ilb.common.jpa.converters;

import java.nio.ByteBuffer;
import java.util.UUID;
import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

/**
 *
 * @author slavb
 */
@Converter
public class UUIDConverterBytes implements AttributeConverter {

    @Override
    public byte[] convertToDatabaseColumn(UUID uuid) {
        if(uuid==null){
            return null;
        }
        ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
        bb.putLong(uuid.getMostSignificantBits());
        bb.putLong(uuid.getLeastSignificantBits());
        return bb.array();
    }

    @Override
    public UUID convertToEntityAttribute(byte[] bytes) {
        if(bytes==null || bytes.length==0){
            return null;
        }
        if (bytes.length != 16) {
            throw new IllegalArgumentException();
        }
        int i = 0;
        long msl = 0;
        for (; i < 8; i++) {
            msl = (msl << 8) | (bytes[i] & 0xFF);
        }
        long lsl = 0;
        for (; i < 16; i++) {
            lsl = (lsl << 8) | (bytes[i] & 0xFF);
        }
        return new UUID(msl, lsl);
    }
}