# ApplicationModel.java

    /*
     * Copyright (c) 2008-2011, Rickard Öberg. All Rights Reserved.
     * Copyright (c) 2008-2013, Niclas Hedhman. All Rights Reserved.
     * Copyright (c) 2012-2014, 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.runtime.structure;

    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import org.qi4j.api.Qi4j;
    import org.qi4j.api.activation.ActivationException;
    import org.qi4j.api.common.InvalidApplicationException;
    import org.qi4j.api.common.MetaInfo;
    import org.qi4j.api.structure.Application;
    import org.qi4j.api.structure.ApplicationDescriptor;
    import org.qi4j.bootstrap.Qi4jRuntime;
    import org.qi4j.functional.HierarchicalVisitor;
    import org.qi4j.runtime.activation.ActivatorsInstance;
    import org.qi4j.runtime.activation.ActivatorsModel;
    import org.qi4j.runtime.injection.InjectionProviderFactory;
    import org.qi4j.runtime.injection.provider.InjectionProviderFactoryStrategy;

    /**
     * JAVADOC
     */
    public final class ApplicationModel
        implements ApplicationDescriptor
    {
        private final String name;
        private final String version;
        private final Application.Mode mode;
        private final MetaInfo metaInfo;
        private final ActivatorsModel<Application> activatorsModel;
        private final List<LayerModel> layers;
        private final InjectionProviderFactory ipf;

        public ApplicationModel( String name,
                                 String version,
                                 Application.Mode mode,
                                 MetaInfo metaInfo,
                                 ActivatorsModel<Application> activatorsModel,
                                 List<LayerModel> layers
        )
        {
            this.name = name;
            this.version = version;
            this.mode = mode;
            this.metaInfo = metaInfo;
            this.activatorsModel = activatorsModel;
            this.layers = layers;
            ipf = new InjectionProviderFactoryStrategy( metaInfo );
        }

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

        public String version()
        {
            return version;
        }

        public Application.Mode mode()
        {
            return mode;
        }

        public MetaInfo metaInfo()
        {
            return metaInfo;
        }

        public ActivatorsInstance<Application> newActivatorsInstance()
            throws ActivationException
        {
            return new ActivatorsInstance<>( activatorsModel.newInstances() );
        }

        // SPI
        @Override
        public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
            throws ThrowableType
        {
            if( visitor.visitEnter( this ) )
            {
                if( activatorsModel.accept( visitor ) )
                {
                    for( LayerModel layer : layers )
                    {
                        if( !layer.accept( visitor ) )
                        {
                            break;
                        }
                    }
                }
            }
            return visitor.visitLeave( this );
        }

        @Override
        public ApplicationInstance newInstance( Qi4j runtime, Object... importedServiceInstances )
            throws InvalidApplicationException
        {
            MetaInfo instanceMetaInfo = new MetaInfo( metaInfo );
            for( Object importedServiceInstance : importedServiceInstances )
            {
                instanceMetaInfo.set( importedServiceInstance );
            }

            ApplicationInstance applicationInstance = new ApplicationInstance( this, (Qi4jRuntime) runtime, instanceMetaInfo );

            // Create layer instances
            Map<LayerModel, LayerInstance> layerInstanceMap = new HashMap<>();
            Map<LayerModel, List<LayerInstance>> usedLayers = new HashMap<>();
            for( LayerModel layer : layers )
            {
                List<LayerInstance> usedLayerInstances = new ArrayList<>();
                usedLayers.put( layer, usedLayerInstances );
                UsedLayersInstance usedLayersInstance = layer.usedLayers().newInstance( usedLayerInstances );
                LayerInstance layerInstance = layer.newInstance( applicationInstance, usedLayersInstance );
                applicationInstance.addLayer( layerInstance );
                layerInstanceMap.put( layer, layerInstance );
            }

            // Resolve used layer instances
            for( LayerModel layer : layers )
            {
                List<LayerInstance> usedLayerInstances = usedLayers.get( layer );
                for( LayerModel usedLayer : layer.usedLayers().layers() )
                {
                    LayerInstance layerInstance = layerInstanceMap.get( usedLayer );
                    if( layerInstance == null )
                    {
                        throw new InvalidApplicationException( "Could not find used layer:" + usedLayer.name() );
                    }
                    usedLayerInstances.add( layerInstance );
                }
            }

            return applicationInstance;
        }

        public InjectionProviderFactory injectionProviderFactory()
        {
            return ipf;
        }

        @Override
        public String toString()
        {
            final StringBuilder sb = new StringBuilder();
            sb.append( "ApplicationModel" );
            sb.append( "{name='" ).append( name ).append( '\'' );
            sb.append( ", version='" ).append( version ).append( '\'' );
            sb.append( ", mode=" ).append( mode );
            sb.append( '}' );
            return sb.toString();
        }
    }