core/spi/src/main/java/org/qi4j/spi/entitystore/ConcurrentEntityStateModificationException.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.entitystore;

import java.util.Collection;
import org.qi4j.api.entity.EntityReference;

/**
 * This exception should be thrown if the EntityStore detects that the entities being saved have been changed
 * since they were created.
 */
public class ConcurrentEntityStateModificationException
    extends EntityStoreException
{
    private Collection<EntityReference> modifiedEntities;

    public ConcurrentEntityStateModificationException( Collection<EntityReference> modifiedEntities )
    {
        super("Entities changed concurrently:" + modifiedEntities);
        this.modifiedEntities = modifiedEntities;
    }

    public Collection<EntityReference> modifiedEntities()
    {
        return modifiedEntities;
    }
}