# AbstractSQLEntityStoreAssembler.java

    /*
     * Copyright (c) 2010, Stanislav Muhametsin. All Rights Reserved.
     * Copyright (c) 2010, 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.entitystore.sql.assembly;

    import java.io.IOException;
    import org.qi4j.api.common.Visibility;
    import org.qi4j.bootstrap.Assemblers;
    import org.qi4j.bootstrap.AssemblyException;
    import org.qi4j.bootstrap.ModuleAssembly;
    import org.qi4j.entitystore.sql.SQLEntityStoreService;
    import org.qi4j.entitystore.sql.internal.DatabaseSQLService.DatabaseSQLServiceComposite;
    import org.qi4j.entitystore.sql.internal.DatabaseSQLServiceCoreMixin;
    import org.qi4j.entitystore.sql.internal.DatabaseSQLServiceSpi;
    import org.qi4j.entitystore.sql.internal.DatabaseSQLServiceStatementsMixin;
    import org.qi4j.entitystore.sql.internal.DatabaseSQLStringsBuilder;
    import org.qi4j.library.sql.common.SQLConfiguration;
    import org.qi4j.spi.uuid.UuidIdentityGeneratorService;
    import org.sql.generation.api.vendor.SQLVendor;
    import org.sql.generation.api.vendor.SQLVendorProvider;

    /**
     * Base SQL EntityStore assembly.
     */
    @SuppressWarnings( "unchecked" )
    abstract class AbstractSQLEntityStoreAssembler<AssemblerType>
        extends Assemblers.VisibilityIdentityConfig<AssemblerType>
    {

        public static final String DEFAULT_ENTITYSTORE_IDENTITY = "entitystore-sql";

        protected SQLVendor getSQLVendor()
            throws IOException
        {
            return SQLVendorProvider.createVendor( SQLVendor.class );
        }

        protected Class<?> getDatabaseStringBuilderMixin()
        {
            return DatabaseSQLStringsBuilder.CommonMixin.class;
        }

        protected abstract Class<?> getDatabaseSQLServiceSpecializationMixin();

        @Override
        public final void assemble( ModuleAssembly module )
            throws AssemblyException
        {
            try
            {
                SQLVendor sqlVendor = this.getSQLVendor();
                if( sqlVendor == null )
                {
                    throw new AssemblyException( "SQL Vendor could not be determined." );
                }
                module.services( DatabaseSQLServiceComposite.class ).
                    withMixins( DatabaseSQLServiceCoreMixin.class,
                                DatabaseSQLServiceSpi.CommonMixin.class,
                                getDatabaseStringBuilderMixin(),
                                DatabaseSQLServiceStatementsMixin.class,
                                getDatabaseSQLServiceSpecializationMixin() ).
                    identifiedBy( hasIdentity() ? identity() : DEFAULT_ENTITYSTORE_IDENTITY ).
                    visibleIn( Visibility.module ).
                    setMetaInfo( sqlVendor );
            }
            catch( IOException ioe )
            {
                throw new AssemblyException( ioe );
            }
            module.services( SQLEntityStoreService.class,
                             UuidIdentityGeneratorService.class ).
                visibleIn( visibility() );
            if( hasConfig() )
            {
                configModule().entities( SQLConfiguration.class ).
                    visibleIn( configVisibility() );
            }
        }

    }