UUIDObjectGenerator.java

/**********************************************************************
Copyright (c) 2015 Andy Jefferson and others. All rights reserved.
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.

Contributors:
     ...
 **********************************************************************/
package org.datanucleus.store.valuegenerator;

import java.util.Properties;
import java.util.UUID;

import org.datanucleus.util.Localiser;
import org.datanucleus.util.NucleusLogger;

/**
 * Value generator for a UUID utilising the JDK UUID class (128-bit, 36 character).
 * Results in UUIDs of length 36 characters, like "2cdb8cee-9134-453f-9d7a-14c0ae8184c6".
 */
public class UUIDObjectGenerator extends AbstractGenerator<UUID>
{
    public UUIDObjectGenerator(String name, Properties props)
    {
        super(name, props);
    }

    /* (non-Javadoc)
     * @see org.datanucleus.store.valuegenerator.AbstractGenerator#reserveBlock(long)
     */
    @Override
    protected ValueGenerationBlock reserveBlock(long size)
    {
        Object[] ids = new Object[(int) size];
        for (int i = 0; i < size; i++)
        {
            ids[i] = UUID.randomUUID();
        }
        if (NucleusLogger.VALUEGENERATION.isDebugEnabled())
        {
            NucleusLogger.VALUEGENERATION.debug(Localiser.msg("040004", "" + size));
        }
        return new ValueGenerationBlock(ids);
    }
}