# 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++ );
        }
    }