# ServiceAssemblyImpl.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.lang.reflect.Type;
    import java.util.ArrayList;
    import java.util.List;
    import org.qi4j.api.activation.Activator;
    import org.qi4j.api.activation.Activators;
    import org.qi4j.api.common.InvalidApplicationException;
    import org.qi4j.api.service.ServiceComposite;
    import org.qi4j.api.util.Annotations;
    import org.qi4j.api.util.Classes;
    import org.qi4j.bootstrap.ServiceAssembly;
    import org.qi4j.bootstrap.StateDeclarations;
    import org.qi4j.functional.Function;
    import org.qi4j.functional.Iterables;
    import org.qi4j.runtime.activation.ActivatorsModel;
    import org.qi4j.runtime.service.ServiceModel;

    /**
     * Assembly of a Service.
     */
    public final class ServiceAssemblyImpl extends CompositeAssemblyImpl
        implements ServiceAssembly
    {
        String identity;
        boolean instantiateOnStartup = false;
        List<Class<? extends Activator<?>>> activators = new ArrayList<>();

        public ServiceAssemblyImpl( Class<?> serviceType )
        {
            super( serviceType );
            // The composite must always implement ServiceComposite, as a marker interface
            if( !ServiceComposite.class.isAssignableFrom( serviceType ) )
            {
                types.add( ServiceComposite.class );
            }
        }

        @Override
        public String identity()
        {
            return identity;
        }

        @SuppressWarnings( {"raw", "unchecked"} )
        ServiceModel newServiceModel( StateDeclarations stateDeclarations, AssemblyHelper helper )
        {
            try
            {
                buildComposite( helper, stateDeclarations );
                List<Class<? extends Activator<?>>> activatorClasses = Iterables.toList(
                        Iterables.<Class<? extends Activator<?>>>flatten( activators, activatorsDeclarations( types ) ) );
                return new ServiceModel( types, visibility, metaInfo,
                                         new ActivatorsModel( activatorClasses ),
                                         mixinsModel, stateModel, compositeMethodsModel,
                                         identity, instantiateOnStartup );
            }
            catch( Exception e )
            {
                throw new InvalidApplicationException( "Could not register " + types, e );
            }
        }

        private Iterable<Class<? extends Activator<?>>> activatorsDeclarations( Iterable<? extends Class<?>> typess )
        {
            // Find activator declarations
            ArrayList<Type> allTypes = new ArrayList<>();
            for( Class<?> type : typess )
            {
                Iterable<Type> types = Classes.typesOf( type );
                Iterables.addAll( allTypes, types );
            }
            // Find all activators and flattern them into an iterable
            Function<Type, Iterable<Class<? extends Activator<?>>>> function = new Function<Type, Iterable<Class<? extends Activator<?>>>>()
            {
                @Override
                public Iterable<Class<? extends Activator<?>>> map( Type type )
                {
                    Activators activators = Annotations.annotationOn( type, Activators.class );
                    if( activators == null )
                    {
                        return Iterables.empty();
                    }
                    else
                    {
                        return Iterables.iterable( activators.value() );
                    }
                }
            };
            Iterable<Class<? extends Activator<?>>> flatten = Iterables.flattenIterables( Iterables.map( function, allTypes ) );
            return Iterables.toList( flatten );
        }

    }