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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.*;

/**
 * 
 * If you want to use annotation based validation, you have to annotate the class or interface with Validation Annotation.
 * 
 *
 *  Annotation usage:
 *
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The Validation annotation must be applied at Type level.
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 *  Parameter  Required  Default  Notes 
message yes   field error message
key no   i18n key from language specific properties file.
fieldName no    
shortCircuit no false If this validator should be used as shortCircuit.
type yes ValidatorType.FIELD Enum value from ValidatorType. Either FIELD or SIMPLE can be used here.
 * 
 *
 *  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
 * @version $Id: Validation.java 1187 2006-11-13 08:05:32Z mrdon $
 */
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface Validation {

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

Parameter	Required	Default	Notes
message	yes		field error message
key	no		i18n key from language specific properties file.
fieldName	no
shortCircuit	no	false	If this validator should be used as shortCircuit.
type	yes	ValidatorType.FIELD	Enum value from ValidatorType. Either FIELD or SIMPLE can be used here.