001// Copyright 2006, 2009 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.annotations;
016
017import java.lang.annotation.Documented;
018import static java.lang.annotation.ElementType.FIELD;
019import java.lang.annotation.Retention;
020import static java.lang.annotation.RetentionPolicy.RUNTIME;
021import java.lang.annotation.Target;
022
023import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.COMPONENT;
024import org.apache.tapestry5.ioc.annotations.UseWith;
025
026/**
027 * Used to attach one ore more instance mixin to an embedded component. Each mixin is specified in terms of a logical
028 * mixin type name. This annotation is only recognized when used in conjuction with the {@link Component} annotation.
029 *
030 * @see MixinClasses
031 */
032@Target(FIELD)
033@Documented
034@Retention(RUNTIME)
035@UseWith(COMPONENT)
036public @interface Mixins
037{
038
039    /**
040     * One or more mixin type names and optional constraints, from which actual mixin class names can be resolved.
041     * For specifying constraints, do:
042     * mixinname::constraint1;constraint2
043     * For instance:
044     * mixina::before:mixinb;after:mixinc;after:mixind
045     */
046    String[] value();
047}