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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.
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/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */

package com.opensymphony.xwork2.validator.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 
 * This annotation has been deprecated since 2.1 as its previous purpose, to define classes that support annotation validations,
 * is no longer necessary.
 * 
 *
 *  Annotation usage:
 *
 * 
 *  
The Validation annotation must be applied at Type level.
 * 
 *
 * 
 Annotation parameters:
 *
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 *  Parameter  Required  Default  Notes 
validations yes   
 * 
 *
 *  Example code:
 *
 * An Annotated Interface
 * 
 * 
 * @Validation()
 * public interface AnnotationDataAware {
 *
 *     void setBarObj(Bar b);
 *
 *     Bar getBarObj();
 *
 *     @RequiredFieldValidator(message = "You must enter a value for data.")
 *     @RequiredStringValidator(message = "You must enter a value for data.")
 *     void setData(String data);
 *
 *     String getData();
 * }
 * 
 * 
 *
 *  Example code:
 *
 * An Annotated Class
 * 
 * 
 * @Validation()
 * public class SimpleAnnotationAction extends ActionSupport {
 *
 *     @RequiredFieldValidator(type = ValidatorType.FIELD, message = "You must enter a value for bar.")
 *     @IntRangeFieldValidator(type = ValidatorType.FIELD, min = "6", max = "10", message = "bar must be between ${min} and ${max}, current value is ${bar}.")
 *     public void setBar(int bar) {
 *         this.bar = bar;
 *     }
 *
 *     public int getBar() {
 *         return bar;
 *     }
 *
 *     @Validations(
 *             requiredFields =
 *                     {@RequiredFieldValidator(type = ValidatorType.SIMPLE, fieldName = "customfield", message = "You must enter a value for field.")},
 *             requiredStrings =
 *                     {@RequiredStringValidator(type = ValidatorType.SIMPLE, fieldName = "stringisrequired", message = "You must enter a value for string.")},
 *             emails =
 *                     { @EmailValidator(type = ValidatorType.SIMPLE, fieldName = "emailaddress", message = "You must enter a value for email.")},
 *             urls =
 *                     { @UrlValidator(type = ValidatorType.SIMPLE, fieldName = "hreflocation", message = "You must enter a value for email.")},
 *             stringLengthFields =
 *                     {@StringLengthFieldValidator(type = ValidatorType.SIMPLE, trim = true, minLength="10" , maxLength = "12", fieldName = "needstringlength", message = "You must enter a stringlength.")},
 *             intRangeFields =
 *                     { @IntRangeFieldValidator(type = ValidatorType.SIMPLE, fieldName = "intfield", min = "6", max = "10", message = "bar must be between ${min} and ${max}, current value is ${bar}.")},
 *             dateRangeFields =
 *                     {@DateRangeFieldValidator(type = ValidatorType.SIMPLE, fieldName = "datefield", min = "-1", max = "99", message = "bar must be between ${min} and ${max}, current value is ${bar}.")},
 *             expressions = {
 *                 @ExpressionValidator(expression = "foo > 1", message = "Foo must be greater than Bar 1. Foo = ${foo}, Bar = ${bar}."),
 *                 @ExpressionValidator(expression = "foo > 2", message = "Foo must be greater than Bar 2. Foo = ${foo}, Bar = ${bar}."),
 *                 @ExpressionValidator(expression = "foo > 3", message = "Foo must be greater than Bar 3. Foo = ${foo}, Bar = ${bar}."),
 *                 @ExpressionValidator(expression = "foo > 4", message = "Foo must be greater than Bar 4. Foo = ${foo}, Bar = ${bar}."),
 *                 @ExpressionValidator(expression = "foo > 5", message = "Foo must be greater than Bar 5. Foo = ${foo}, Bar = ${bar}.")
 *     }
 *     )
 *     public String execute() throws Exception {
 *         return SUCCESS;
 *     }
 * }
 *
 * 
 * 
 *
 * @author Rainer Hermanns
 * @deprecated Since Struts 2.1 because it isn't necessary anymore
 * @version $Id: Validation.java 1833 2008-06-21 09:29:39Z rainerh $
 */
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface Validation {

    /**
     * Used for class or interface validation rules.
     */
    Validations[] validations() default {};
}