001    // Copyright 2006 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.tapestry.annotations;
016    
017    import java.lang.annotation.Documented;
018    import java.lang.annotation.ElementType;
019    import java.lang.annotation.Retention;
020    import static java.lang.annotation.RetentionPolicy.RUNTIME;
021    import java.lang.annotation.Target;
022    
023    /**
024     * Marks methods to be invoked when the component rendering state machine hits the point in the component's template
025     * where the body element occurs. Such methods may optionally take a {@link org.apache.tapestry.MarkupWriter} parameter,
026     * and may return void or boolean.
027     * <p/>
028     * Returning true (or void) will queue up the component's body for rendering.
029     * <p/>
030     * Returning false will skip the component's body, but continue rendering the template. The {@link
031     * org.apache.tapestry.annotations.AfterRenderBody} phase will still execute after the template finishes rendering.
032     * <p/>
033     * This phase is skipped for components which do not have a body.
034     */
035    @Target(ElementType.METHOD)
036    @Retention(RUNTIME)
037    @Documented
038    public @interface BeforeRenderBody
039    {
040    
041    }