001    // Copyright 2007, 2008 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.beaneditor;
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     * Used to attach validation constraints directly to a property (either the getter or the setter method). The annotation
025     * value is a comma separated list of <em>validation constraints</em>, each one identifying a validator type (such as
026     * "required", "minlength") and optionally, a constraint value. Most validators need a constraint value, which is
027     * separated from the type by an equals size (i.e., "maxlength=30").
028     * <p/>
029     * May be placed on any getter or setter method, or on the matching field.
030     */
031    @Target({ElementType.FIELD, ElementType.METHOD})
032    @Retention(RUNTIME)
033    @Documented
034    public @interface Validate
035    {
036        String value();
037    }