# NamedAssociationMixin.java

    /*
     * Copyright (c) 2011-2012, Niclas Hedhman. All Rights Reserved.
     * Copyright (c) 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.api.association;

    import java.lang.reflect.InvocationHandler;
    import java.lang.reflect.Method;
    import org.qi4j.api.common.AppliesTo;
    import org.qi4j.api.common.AppliesToFilter;
    import org.qi4j.api.injection.scope.State;

    /**
     * Generic mixin for NamedAssociations.
     */
    @AppliesTo( NamedAssociationMixin.AssociationFilter.class )
    public final class NamedAssociationMixin
        implements InvocationHandler
    {
        @State
        private AssociationStateHolder associations;

        @Override
        public Object invoke( Object proxy, Method method, Object[] args )
            throws Throwable
        {
            return associations.namedAssociationFor( method );
        }

        /**
         * NamedAssociations generic mixin AppliesToFilter.
         */
        public static class AssociationFilter
            implements AppliesToFilter
        {
            @Override
            public boolean appliesTo( Method method, Class<?> mixin, Class<?> compositeType, Class<?> modifierClass )
            {
                return NamedAssociation.class.isAssignableFrom( method.getReturnType() );
            }
        }

    }