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    
015    package org.apache.tapestry5.annotations;
016    
017    import java.lang.annotation.Documented;
018    import static java.lang.annotation.ElementType.FIELD;
019    import java.lang.annotation.Retention;
020    import static java.lang.annotation.RetentionPolicy.RUNTIME;
021    import java.lang.annotation.Target;
022    
023    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.COMPONENT;
024    import org.apache.tapestry5.ioc.annotations.UseWith;
025    
026    /**
027     * Used to attach one or more instance mixins to an embedded component. Each mixin is specified as a specific class.
028     * This annotation is only recognized when used in conjuction with the {@link Component} annotation.
029     *
030     * @see Mixins
031     */
032    @Target(FIELD)
033    @Documented
034    @Retention(RUNTIME)
035    @UseWith(COMPONENT)
036    public @interface MixinClasses
037    {
038        Class[] value();
039    
040        /**
041         * Specifies the ordering constraints for each mixin specified by value. Order may be a 0-length array signifying
042         * no ordering for any mixin specified by value.  Otherwise, it must be the same length as value.
043         * Each String can specify multiple constraints, separated by ; (before:mixina;after:mixinb).
044         * Alternatively, the entry may be null or the empty string to specify no ordering constraints for that particular
045         * mixin.
046         * @since 5.2.0.0
047         */
048        String[] order() default {};
049    
050    }