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1   package model.validation;
2   
3   import javax.validation.Constraint;
4   import javax.validation.Payload;
5   import java.lang.annotation.*;
6   
7   /**
8    * L'username deve essere univoco
9    * @see UniqueUsernameValidator
10   */
11  @Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER,
12          ElementType.ANNOTATION_TYPE})
13  @Retention(RetentionPolicy.RUNTIME)
14  @Constraint(validatedBy = UniqueUsernameValidator.class)
15  @Documented
16  public @interface UniqueUsername {
17      String message() default "Username already exists";
18  
19      Class<?>[] groups() default {};
20  
21      Class<? extends Payload>[] payload() default {};
22  }