# SQLStateChangeListener.java

    /*
     * Copyright (c) 2010, Stanislav Muhametsin. All Rights Reserved.
     * Copyright (c) 2012, Paul Merlin. 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.
     */
    package org.qi4j.index.sql.internal;

    import java.sql.SQLException;
    import org.qi4j.api.injection.scope.Service;
    import org.qi4j.api.unitofwork.UnitOfWorkException;
    import org.qi4j.index.sql.support.api.SQLIndexing;
    import org.qi4j.spi.entity.EntityState;
    import org.qi4j.spi.entitystore.StateChangeListener;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class SQLStateChangeListener
        implements StateChangeListener
    {

        private static final Logger LOGGER = LoggerFactory.getLogger( SQLStateChangeListener.class );

        @Service
        private SQLIndexing _indexing;

        @Override
        public void notifyChanges( Iterable<EntityState> changedStates )
        {
            try
            {
                this._indexing.indexEntities( changedStates );
            }
            catch( SQLException sqle )
            {
                SQLException lastException = sqle;
                while( sqle.getNextException() != null )
                {
                    sqle = sqle.getNextException();
                }
                LOGGER.error( "Error when indexing entities", sqle );

                // TODO is UoWException right one for this?
                throw new UnitOfWorkException( lastException );
            }
        }

    }