# SPIFinder.java

    /*
     * Copyright (c) 2009, Tonny Kohar. 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.tools.model.util;

    import java.util.ArrayList;
    import java.util.List;
    import org.qi4j.tools.model.descriptor.ApplicationDetailDescriptor;
    import org.qi4j.tools.model.descriptor.EntityDetailDescriptor;
    import org.qi4j.tools.model.descriptor.InjectedFieldDetailDescriptor;
    import org.qi4j.tools.model.descriptor.LayerDetailDescriptor;
    import org.qi4j.tools.model.descriptor.MixinDetailDescriptor;
    import org.qi4j.tools.model.descriptor.ModuleDetailDescriptor;
    import org.qi4j.tools.model.descriptor.ObjectDetailDescriptor;
    import org.qi4j.tools.model.descriptor.ServiceDetailDescriptor;
    import org.qi4j.tools.model.descriptor.TransientDetailDescriptor;
    import org.qi4j.tools.model.descriptor.ValueDetailDescriptor;

    /**
     * SPI would be defined as "All service dependencies which are not satisfied from within the module or Layer".
     */
    class SPIFinder
    {
        private ApplicationDetailDescriptor appDetailDescriptor;

        public List<ServiceDetailDescriptor> findModule( ModuleDetailDescriptor descriptor )
        {
            appDetailDescriptor = descriptor.layer().application();

            ArrayList<ServiceDetailDescriptor> list = new ArrayList<>();

            findInServices( descriptor.services(), list );
            findInEntities( descriptor.entities(), list );
            findInValues( descriptor.values(), list );
            findInTransients( descriptor.transients(), list );
            findInObjects( descriptor.objects(), list );

            return list;
        }

        public List<ServiceDetailDescriptor> findLayerSPI( LayerDetailDescriptor descriptor )
        {
            List<ServiceDetailDescriptor> list = new ArrayList<>();

            for( ModuleDetailDescriptor moduleDetailDescriptor : descriptor.modules() )
            {
                list.addAll( findModule( moduleDetailDescriptor ) );
            }

            return list;
        }

        private void findInMixin( Iterable<MixinDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( MixinDetailDescriptor descriptor : iter )
            {
                findInInjectedField( descriptor.injectedFields(), list );
            }
        }

        private void findInInjectedField( Iterable<InjectedFieldDetailDescriptor> iter,
                                          ArrayList<ServiceDetailDescriptor> list
        )
        {
    //        for( InjectedFieldDetailDescriptor descriptorField : iter )
    //        {
    //            DependencyDescriptor dependencyDescriptor = descriptorField.descriptor().dependency();
    //            Annotation annotation = dependencyDescriptor.injectionAnnotation();

    //            Class<? extends Annotation> clazz = annotation.annotationType();
    //            if( Uses.class.equals( clazz ) || Service.class.equals( clazz ) )
    //            {
    //                for( String name : dependencyDescriptor.injectedServices() )
    //                {
    //                    ServiceDetailDescriptor serviceDetailDescriptor = lookupServiceDetailDescriptor( name );
    //                    if( serviceDetailDescriptor != null )
    //                    {
    //                        if( !list.contains( serviceDetailDescriptor ) )
    //                        {
    //                            list.add( serviceDetailDescriptor );
    //                        }
    //                    }
    //                }
    //            }
    //        }
        }

        private void findInServices( Iterable<ServiceDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( ServiceDetailDescriptor descriptor : iter )
            {
                findInMixin( descriptor.mixins(), list );
            }
        }

        private void findInEntities( Iterable<EntityDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( EntityDetailDescriptor descriptor : iter )
            {
                findInMixin( descriptor.mixins(), list );
            }
        }

        private void findInValues( Iterable<ValueDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( ValueDetailDescriptor descriptor : iter )
            {
                findInMixin( descriptor.mixins(), list );
            }
        }

        private void findInTransients( Iterable<TransientDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( TransientDetailDescriptor descriptor : iter )
            {
                findInMixin( descriptor.mixins(), list );
            }
        }

        private void findInObjects( Iterable<ObjectDetailDescriptor> iter, ArrayList<ServiceDetailDescriptor> list )
        {
            for( ObjectDetailDescriptor descriptor : iter )
            {
                findInInjectedField( descriptor.injectedFields(), list );
            }
        }

        private ServiceDetailDescriptor lookupServiceDetailDescriptor( String name )
        {
            ServiceDetailDescriptor serviceDetailDescriptor = null;
            for( LayerDetailDescriptor layer : appDetailDescriptor.layers() )
            {
                for( ModuleDetailDescriptor module : layer.modules() )
                {
                    for( ServiceDetailDescriptor service : module.services() )
                    {
                        if( service.toString().equals( name ) )
                        {
                            serviceDetailDescriptor = service;
                            break;
                        }
                    }
                    if( serviceDetailDescriptor != null )
                    {
                        break;
                    }
                }
                if( serviceDetailDescriptor != null )
                {
                    break;
                }
            }
            return serviceDetailDescriptor;
        }
    }