feat: email unico

src/main/java/br/com/zupacademy/fabiano/mercadolivre/dto/UsuarioRegisterDto.java

@@ -1,6 +1,7 @@
 package br.com.zupacademy.fabiano.mercadolivre.dto;
 
 import br.com.zupacademy.fabiano.mercadolivre.modelo.Usuario;
+import br.com.zupacademy.fabiano.mercadolivre.validator.ValorUnico;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 
 import javax.validation.constraints.*;
@@ -9,6 +10,7 @@ public class UsuarioRegisterDto {
     @NotNull
     @NotEmpty
     @Email
+    @ValorUnico(field = "login", instanceClass = Usuario.class)
     private String login;
     @NotNull
     @NotEmpty

src/main/java/br/com/zupacademy/fabiano/mercadolivre/modelo/Usuario.java

@@ -17,7 +17,7 @@ public class Usuario {
     @NotNull
     @NotEmpty
     @Email
-    @Column(nullable = false)
+    @Column(nullable = false, unique = true)
     private String login;
     @NotNull
     @NotEmpty

src/main/java/br/com/zupacademy/fabiano/mercadolivre/validator/ValorUnico.java

@@ -0,0 +1,17 @@
+package br.com.zupacademy.fabiano.mercadolivre.validator;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = ValorUnicoValidator.class)
+@Target({ ElementType.FIELD })
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ValorUnico {
+    String message() default "Restricao valor unico";
+    Class<?>[] groups() default {};
+    Class<? extends Payload>[] payload() default {};
+    String field();
+    Class instanceClass();
+}

src/main/java/br/com/zupacademy/fabiano/mercadolivre/validator/ValorUnicoValidator.java

@@ -0,0 +1,31 @@
+package br.com.zupacademy.fabiano.mercadolivre.validator;
+
+import javax.persistence.EntityManager;
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+public class ValorUnicoValidator implements ConstraintValidator<ValorUnico, Object> {
+    private EntityManager em;
+
+    private Class<?> object;
+    private String field;
+
+    public ValorUnicoValidator(EntityManager em) {
+        this.em = em;
+    }
+
+    @Override
+    public boolean isValid(Object value, ConstraintValidatorContext context) {
+        return this.em.createQuery("select 1 from "+this.object.getName()+" where "+ field+"=:field")
+                .setParameter("field",value)
+                .getResultList()
+                .isEmpty();
+    }
+
+    @Override
+    public void initialize(ValorUnico constraintAnnotation) {
+        this.object = constraintAnnotation.instanceClass();
+        this.field = constraintAnnotation.field();
+        ConstraintValidator.super.initialize(constraintAnnotation);
+    }
+}