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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2010 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;

/**
 * Value generator for a UUID utilising the JDK UUID class (128-bit, 36 character).
 * Results in Strings of length 36 characters, like "2cdb8cee-9134-453f-9d7a-14c0ae8184c6".
 */
public class UUIDGenerator extends AbstractUIDGenerator
{
    /**
     * Constructor.
     * @param name Symbolic name for this generator
     * @param props Properties controlling its behaviour
     */
    public UUIDGenerator(String name, Properties props)
    {
        super(name, props);
    }

    /**
     * Create an identifier with the form "2cdb8cee-9134-453f-9d7a-14c0ae8184c6".
     * @return The identifier
     */
    protected String getIdentifier()
    {
        return UUID.randomUUID().toString();
    }
}