http://www.dropwizard.io/2.0.18/dropwizard-bom/dropwizard-dependencies/dropwizard-parent/dropwizard-validation: Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web applications.
  • Coda Hale
  • Nick Telford
  • Graham O'Regan
  • Ryan Kennedy
  • Camille Fournier
  • Carlo Barbara
  • Matt Veitas
  • Ryan Tenney
  • Jochen Schalanda
  • Glenn McAllister
  • Nick Babcock
  • Justin Plock
  • Artem Prigoda 
package io.dropwizard.validation;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE_USE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;


Checks to see that the value is one of a set of elements.

/**
 * Checks to see that the value is one of a set of elements.
 */
@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = OneOfValidator.class)
public @interface OneOf {
    String message() default "must be one of {value}";

    Class<?>[] groups() default {};

    @SuppressWarnings("UnusedDeclaration") Class<? extends Payload>[] payload() default {};

    
The set of valid values.

/**
     * The set of valid values.
     */
    String[] value();

    
Whether or not to ignore case.

/**
     * Whether or not to ignore case.
     */
    boolean ignoreCase() default false;

    
Whether or not to ignore leading and trailing whitespace.

/**
     * Whether or not to ignore leading and trailing whitespace.
     */
    boolean ignoreWhitespace() default false;
}