| /* |
| * Copyright (c) 2007, Rickard Öberg. All Rights Reserved. |
| * Copyright (c) 2007, 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.mixin; |
| |
| import java.lang.annotation.Documented; |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * This annotation is used in composites to declare mixin implementation classes. |
| * <p> |
| * Mixins tells the runtime which implementation class of a Mixin should be |
| * used. The @Mixins annotation can occur at any level in the composite hierarchy |
| * and the runtime will match each found Mixin implementation against a Mixins annotation. |
| * All mixin interfaces must have a Mixin implementation in the composite hierarchy or |
| * a runtime exception will occur. |
| * </p> |
| * <p> |
| * Example; |
| * </p> |
| * <pre><code> |
| * |
| * @Mixins( MyBeerOrder.class ) |
| * public interface BeerOrderComposite extends BeerOrder, Composite |
| * { |
| * } |
| * |
| * public class MyBeerOrder |
| * implements BeerOrder |
| * { |
| * : |
| * } |
| * </code></pre> |
| * <p> |
| * Many implementations can be listed, |
| * </p> |
| * <pre><code> |
| * @Mixins( { MyBeerOrder.class, DescriptionImpl.class } ) |
| * public interface BeerOrderComposite extends BeerOrder, Description, Composite |
| * { |
| * } |
| * </code></pre> |
| * <p> |
| * If the Mixins is a class that implements InvocationHandler, it will be |
| * used for all mixins. To avoid that an invocation handler based implementation |
| * not service all mixin, use the AppliesTo annotation. |
| * </p> |
| * |
| * <p> |
| * It is valid to have multiple Mixins for a mixin. The first one found |
| * will be used. The search order is in the order they are written in the Mixins |
| * annotation left-to-right, and depth-first recursive search of the super-interfaces again |
| * left-to-right. |
| * </p> |
| * |
| * @see org.qi4j.api.common.AppliesTo |
| */ |
| @Retention( RetentionPolicy.RUNTIME ) |
| @Target( ElementType.TYPE ) |
| @Documented |
| public @interface Mixins |
| { |
| Class<?>[] value(); |
| } |