core/spi/src/main/java/org/qi4j/spi/uuid/UuidIdentityGeneratorMixin.java

/*  Copyright 2007 Niclas Hedhman.
 *
 * 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.qi4j.spi.uuid;

import java.util.UUID;
import org.qi4j.api.entity.IdentityGenerator;

/**
 * UUID based Identity generator mixin.
 */
public class UuidIdentityGeneratorMixin
    implements IdentityGenerator
{
    protected String uuid;
    private int count;

    public UuidIdentityGeneratorMixin()
    {
        uuid = UUID.randomUUID().toString() + "-";
    }

    @Override
    public String generate( Class<?> compositeType )
    {
        return uuid + Integer.toHexString( count++ );
    }
}