| /* |
| * Copyright 2008 Niclas Hedhman. 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.AccessibleObject; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| |
| import static org.qi4j.api.util.Classes.typeOf; |
| |
| /** |
| * Generic Association info. |
| */ |
| public final class GenericAssociationInfo |
| { |
| public static Type associationTypeOf( AccessibleObject accessor ) |
| { |
| return toAssociationType( typeOf( accessor ) ); |
| } |
| |
| public static Type toAssociationType( Type methodReturnType ) |
| { |
| if( methodReturnType instanceof ParameterizedType ) |
| { |
| ParameterizedType parameterizedType = (ParameterizedType) methodReturnType; |
| if( AbstractAssociation.class.isAssignableFrom( (Class<?>) parameterizedType.getRawType() ) ) |
| { |
| return parameterizedType.getActualTypeArguments()[ 0 ]; |
| } |
| } |
| |
| Type[] interfaces = ( (Class<?>) methodReturnType ).getGenericInterfaces(); |
| for( Type anInterface : interfaces ) |
| { |
| Type associationType = toAssociationType( anInterface ); |
| if( associationType != null ) |
| { |
| return associationType; |
| } |
| } |
| return null; |
| } |
| } |