# ActivatorsModel.java

    /*
     * 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.activation;

    import java.util.ArrayList;
    import java.util.List;
    import org.qi4j.api.activation.ActivationException;
    import org.qi4j.api.activation.Activator;
    import org.qi4j.api.structure.Module;
    import org.qi4j.functional.HierarchicalVisitor;
    import org.qi4j.functional.VisitableHierarchy;
    import org.qi4j.runtime.composite.UsesInstance;
    import org.qi4j.runtime.injection.InjectionContext;
    import org.qi4j.runtime.structure.ModuleInstance;

    /**
     * Activators Model.
     *
     * @param <ActivateeType> Type of the activation target
     */
    public class ActivatorsModel<ActivateeType>
        implements VisitableHierarchy<Object, Object>
    {

        private final List<ActivatorModel<ActivateeType>> activatorModels = new ArrayList<>();
        private final Iterable<Class<? extends Activator<ActivateeType>>> activatorsClasses;

        public ActivatorsModel( Iterable<Class<? extends Activator<ActivateeType>>> activatorsClasses )
        {
            this.activatorsClasses = activatorsClasses;
            for( Class<? extends Activator<ActivateeType>> activatorClass : activatorsClasses )
            {
                activatorModels.add( new ActivatorModel<>( activatorClass ) );
            }
        }

        @Override
        public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
            throws ThrowableType
        {
            if( visitor.visitEnter( this ) )
            {
                for( ActivatorModel<ActivateeType> activatorModel : activatorModels )
                {
                    if( !activatorModel.accept( visitor ) )
                    {
                        break;
                    }
                }
            }
            return visitor.visitLeave( this );
        }

        public Iterable<ActivatorModel<ActivateeType>> models()
        {
            return activatorModels;
        }

        public Iterable<Activator<ActivateeType>> newInstances()
            throws ActivationException
        {
            List<Activator<ActivateeType>> activators = new ArrayList<>();
            for( ActivatorModel<ActivateeType> activatorModel : activatorModels )
            {
                activators.add( activatorModel.newInstance() );
            }
            return activators;
        }

        public Iterable<Activator<ActivateeType>> newInstances( Module module )
            throws ActivationException
        {
            List<Activator<ActivateeType>> activators = new ArrayList<>();
            for( ActivatorModel<ActivateeType> activatorModel : activatorModels )
            {
                InjectionContext injectionContext = new InjectionContext( (ModuleInstance) module, UsesInstance.EMPTY_USES );
                activators.add( activatorModel.newInstance( injectionContext ) );
            }
            return activators;
        }

    }