# InjectedMethodsModel.java

    /*
     * Copyright (c) 2008, Rickard Öberg. 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.injection;

    import java.lang.annotation.Annotation;
    import java.lang.reflect.Method;
    import java.lang.reflect.ParameterizedType;
    import java.lang.reflect.Type;
    import java.lang.reflect.TypeVariable;
    import java.util.ArrayList;
    import java.util.List;
    import org.qi4j.api.injection.InjectionScope;
    import org.qi4j.api.util.Annotations;
    import org.qi4j.api.util.Classes;
    import org.qi4j.api.util.Methods;
    import org.qi4j.functional.HierarchicalVisitor;
    import org.qi4j.functional.Specifications;
    import org.qi4j.functional.VisitableHierarchy;

    import static org.qi4j.api.util.Annotations.hasAnnotation;
    import static org.qi4j.functional.Iterables.filter;
    import static org.qi4j.functional.Iterables.first;
    import static org.qi4j.functional.Iterables.flattenIterables;
    import static org.qi4j.functional.Iterables.iterable;
    import static org.qi4j.functional.Iterables.map;

    /**
     * JAVADOC
     */
    public final class InjectedMethodsModel
        implements Dependencies, VisitableHierarchy<Object, Object>
    {
        // Model
        private final List<InjectedMethodModel> methodModels = new ArrayList<InjectedMethodModel>();

        public InjectedMethodsModel( Class fragmentClass )
        {
            nextMethod:
            for( Method method : Methods.METHODS_OF.map( fragmentClass ) )
            {
                Annotation[][] parameterAnnotations = method.getParameterAnnotations();
                if( parameterAnnotations.length > 0 )
                {
                    InjectedParametersModel parametersModel = new InjectedParametersModel();
                    final Type[] genericParameterTypes = method.getGenericParameterTypes();
                    for( int i = 0; i < parameterAnnotations.length; i++ )
                    {
                        Annotation injectionAnnotation = first( filter( Specifications.translate( Annotations.type(), hasAnnotation( InjectionScope.class ) ), iterable( parameterAnnotations[ i ] ) ) );
                        if( injectionAnnotation == null )
                        {
                            continue nextMethod;
                        }

                        Type genericType = genericParameterTypes[ i ];
                        if( genericType instanceof ParameterizedType )
                        {
                            genericType = new ParameterizedTypeInstance( ( (ParameterizedType) genericType ).getActualTypeArguments(), ( (ParameterizedType) genericType )
                                .getRawType(), ( (ParameterizedType) genericType ).getOwnerType() );

                            for( int j = 0; j < ( (ParameterizedType) genericType ).getActualTypeArguments().length; j++ )
                            {
                                Type type = ( (ParameterizedType) genericType ).getActualTypeArguments()[ j ];
                                if( type instanceof TypeVariable )
                                {
                                    type = Classes.resolveTypeVariable( (TypeVariable) type, method.getDeclaringClass(), fragmentClass );
                                    ( (ParameterizedType) genericType ).getActualTypeArguments()[ j ] = type;
                                }
                            }
                        }

                        boolean optional = DependencyModel.isOptional( injectionAnnotation, parameterAnnotations[ i ] );
                        DependencyModel dependencyModel = new DependencyModel( injectionAnnotation, genericType, fragmentClass, optional, parameterAnnotations[ i ] );
                        parametersModel.addDependency( dependencyModel );
                    }
                    InjectedMethodModel methodModel = new InjectedMethodModel( method, parametersModel );
                    methodModels.add( methodModel );
                }
            }
        }

        @Override
        public Iterable<DependencyModel> dependencies()
        {
            return flattenIterables( map( Dependencies.DEPENDENCIES_FUNCTION, methodModels ) );
        }

        // Context
        public void inject( InjectionContext context, Object instance )
        {
            for( InjectedMethodModel methodModel : methodModels )
            {
                methodModel.inject( context, instance );
            }
        }

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