# PreferenceEntityStoreAssembler.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.entitystore.prefs.assembly;

    import java.util.prefs.Preferences;
    import org.qi4j.bootstrap.Assemblers;
    import org.qi4j.bootstrap.AssemblyException;
    import org.qi4j.bootstrap.ModuleAssembly;
    import org.qi4j.bootstrap.ServiceDeclaration;
    import org.qi4j.entitystore.prefs.PreferencesEntityStoreInfo;
    import org.qi4j.entitystore.prefs.PreferencesEntityStoreService;
    import org.qi4j.spi.uuid.UuidIdentityGeneratorService;

    public class PreferenceEntityStoreAssembler
        extends Assemblers.VisibilityIdentity<PreferenceEntityStoreAssembler>
    {
        @Override
        public void assemble( ModuleAssembly module )
            throws AssemblyException
        {
            String applicationName = module.layer().application().name();

            Preferences root = Preferences.userRoot();
            Preferences node = root.node( applicationName );
            PreferencesEntityStoreInfo info = new PreferencesEntityStoreInfo( node );
            ServiceDeclaration service = module.services( PreferencesEntityStoreService.class )
                .setMetaInfo( info )
                .visibleIn( visibility() )
                .instantiateOnStartup();
            if( hasIdentity() )
            {
                service.identifiedBy( identity() );
            }
            module.services( UuidIdentityGeneratorService.class ).visibleIn( visibility() );
        }
    }