# EntityCompositeAlreadyExistsException.java

    /*
     * Copyright 2008 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.api.unitofwork;

    import org.qi4j.api.entity.EntityReference;

    /**
     * If you try to create an EntityComposite whose identity already exists,
     * then this exception will be thrown.
     */
    public class EntityCompositeAlreadyExistsException
        extends UnitOfWorkException
    {
        private static final long serialVersionUID = -7297710939536508481L;

        private final EntityReference identity;

        public EntityCompositeAlreadyExistsException( EntityReference identity )
        {
            super( "EntityComposite (" + identity + ") already exists." );
            this.identity = identity;
        }

        public EntityReference identity()
        {
            return identity;
        }
    }