pep1.commons.jpa.util.UUIDGenerator Maven / Gradle / Ivy

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/*
 * Copyright (C) 2016 Leonard Osang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package pep1.commons.jpa.util;

import lombok.extern.slf4j.Slf4j;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.IdentifierGenerator;

import java.io.Serializable;
import java.nio.ByteBuffer;
import java.util.Base64;
import java.util.UUID;

/**
 * @since 10/21/15
 */
@Slf4j
public class UUIDGenerator implements IdentifierGenerator {

    @Override
    public Serializable generate(SessionImplementor session, Object object) throws HibernateException {
        if (log.isDebugEnabled()) {
            log.debug("Invoking generate id method for object {}.", object);
        }

        UUID uuid = UUID.randomUUID();

        ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
        bb.putLong(uuid.getMostSignificantBits());
        bb.putLong(uuid.getLeastSignificantBits());

        return new String(Base64.getEncoder().encode(bb.array()));
    }
}