# ImportedServiceAssemblyImpl.java

    /*
     * Copyright (c) 2007, Rickard Öberg. All Rights Reserved.
     * Copyright (c) 2012, Paul Merlin.
     *
     * 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.runtime.bootstrap;

    import java.util.ArrayList;
    import java.util.List;
    import org.qi4j.api.activation.Activator;
    import org.qi4j.api.common.InvalidApplicationException;
    import org.qi4j.api.common.MetaInfo;
    import org.qi4j.api.common.Visibility;
    import org.qi4j.api.service.ServiceImporter;
    import org.qi4j.api.service.importer.InstanceImporter;
    import org.qi4j.bootstrap.ImportedServiceAssembly;
    import org.qi4j.functional.Iterables;
    import org.qi4j.runtime.activation.ActivatorsModel;
    import org.qi4j.runtime.service.ImportedServiceModel;

    /**
     * Declaration of an imported Service.
     *
     * Created by {@link org.qi4j.runtime.bootstrap.ModuleAssemblyImpl#importedServices(Class[])}.
     */
    public final class ImportedServiceAssemblyImpl
        implements ImportedServiceAssembly
    {
        private final Class<?> serviceType;
        private final ModuleAssemblyImpl moduleAssembly;
        @SuppressWarnings( "raw" )
        Class<? extends ServiceImporter> serviceProvider = InstanceImporter.class;
        String identity;
        boolean importOnStartup = false;
        MetaInfo metaInfo = new MetaInfo();
        Visibility visibility = Visibility.module;
        List<Class<? extends Activator<?>>> activators = new ArrayList<>();

        public ImportedServiceAssemblyImpl( Class<?> serviceType, ModuleAssemblyImpl moduleAssembly )
        {
            this.serviceType = serviceType;
            this.moduleAssembly = moduleAssembly;
        }

        @Override
        public Iterable<Class<?>> types()
        {
            return Iterables.<Class<?>>iterable( serviceType );
        }

        @SuppressWarnings( {"raw", "unchecked"} )
        void addImportedServiceModel( List<ImportedServiceModel> serviceModels )
        {
            try
            {
                String id = identity;
                if( id == null )
                {
                    id = generateId( serviceModels, serviceType );
                }

                ImportedServiceModel serviceModel = new ImportedServiceModel( serviceType,
                                                                              visibility,
                                                                              serviceProvider,
                                                                              id,
                                                                              importOnStartup,
                                                                              new MetaInfo( metaInfo ).withAnnotations( serviceType ),
                                                                              new ActivatorsModel( activators ),
                                                                              moduleAssembly.name() );
                serviceModels.add( serviceModel );
            }
            catch( Exception e )
            {
                throw new InvalidApplicationException( "Could not register " + serviceType.getName(), e );
            }
        }

        @SuppressWarnings( "raw" )
        private String generateId( List<ImportedServiceModel> serviceModels, Class serviceType )
        {
            // Find identity that is not yet used
            int idx = 0;
            String id = serviceType.getSimpleName();
            boolean invalid;
            do
            {
                invalid = false;
                for( ImportedServiceModel serviceModel : serviceModels )
                {
                    if( serviceModel.identity().equals( id ) )
                    {
                        idx++;
                        id = serviceType.getSimpleName() + "_" + idx;
                        invalid = true;
                        break;
                    }
                }
            }
            while( invalid );
            return id;
        }
    }