extensions/indexing-sql/src/main/java/org/qi4j/index/sql/assembly/AbstractSQLIndexQueryAssembler.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.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.index.reindexer.ReindexerConfiguration;
import org.qi4j.index.reindexer.ReindexerService;
import org.qi4j.index.sql.support.common.ReindexingStrategy;
import org.qi4j.library.sql.common.SQLConfiguration;
import org.sql.generation.api.vendor.SQLVendor;
import org.sql.generation.api.vendor.SQLVendorProvider;

public abstract class AbstractSQLIndexQueryAssembler<AssemblerType>
    extends Assemblers.VisibilityIdentityConfig<AssemblerType>
{
    public static final String DEFAULT_IDENTITY = "indexing-sql";

    private Class<? extends ReindexingStrategy> reindexingStrategy = ReindexingStrategy.NeverNeed.class;

    public AbstractSQLIndexQueryAssembler()
    {
        identifiedBy( DEFAULT_IDENTITY );
    }

    @SuppressWarnings( "unchecked" )
    public AssemblerType withReindexingStrategy( Class<? extends ReindexingStrategy> reindexingStrategy )
    {
        this.reindexingStrategy = reindexingStrategy;
        return (AssemblerType) this;
    }

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

    protected abstract Class<?> getIndexQueryServiceType();

    @Override
    public final void assemble( ModuleAssembly module )
        throws AssemblyException
    {
        try
        {
            SQLVendor sqlVendor = getSQLVendor();
            if( sqlVendor == null )
            {
                throw new AssemblyException( "SQL Vendor could not be determined." );
            }
            module.services( getIndexQueryServiceType() )
                .identifiedBy( identity() )
                .setMetaInfo( sqlVendor )
                .visibleIn( visibility() )
                .instantiateOnStartup();
        }
        catch( IOException ex )
        {
            throw new AssemblyException( "SQL Vendor could not be created", ex );
        }

        module.services( ReindexerService.class ).
            visibleIn( Visibility.module );
        module.services( ReindexingStrategy.class ).
            withMixins( reindexingStrategy ).
            visibleIn( Visibility.module );

        if( hasConfig() )
        {
            configModule().entities( SQLConfiguration.class,
                                     ReindexerConfiguration.class ).
                visibleIn( configVisibility() );
        }
    }

}