feat: cadastro categoria

src/main/java/br/com/zupacademy/fabiano/mercadolivre/controller/CategoriaController.java

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+package br.com.zupacademy.fabiano.mercadolivre.controller;
+
+import br.com.zupacademy.fabiano.mercadolivre.dto.CategoriaDto;
+import br.com.zupacademy.fabiano.mercadolivre.modelo.Categoria;
+import br.com.zupacademy.fabiano.mercadolivre.repository.CategoriaRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.Valid;
+
+@RestController
+@RequestMapping("/categorias")
+public class CategoriaController {
+    @Autowired
+    CategoriaRepository repository;
+
+    @PostMapping
+    public ResponseEntity<Categoria> cadastrar(@RequestBody @Valid CategoriaDto dto){
+        Categoria categoria = dto.converter(repository);
+        repository.save(categoria);
+        return ResponseEntity.ok(categoria);
+    }
+}

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

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+package br.com.zupacademy.fabiano.mercadolivre.dto;
+
+import br.com.zupacademy.fabiano.mercadolivre.modelo.Categoria;
+import br.com.zupacademy.fabiano.mercadolivre.repository.CategoriaRepository;
+import br.com.zupacademy.fabiano.mercadolivre.validator.ChecaExistencia;
+import br.com.zupacademy.fabiano.mercadolivre.validator.ValorUnico;
+
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+
+public class CategoriaDto {
+    @NotNull
+    @NotEmpty
+    @ValorUnico(field = "nome", instanceClass = Categoria.class)
+    private String nome;
+    @ChecaExistencia(identityField = "id", instanceClass = Categoria.class)
+    private Long categoriaMae;
+
+    public CategoriaDto() {
+    }
+
+    public CategoriaDto(@NotNull @NotEmpty String nome,
+                        Long categoriaMae) {
+        this.nome = nome;
+        this.categoriaMae = categoriaMae;
+    }
+
+    public String getNome() {
+        return nome;
+    }
+
+    public Long getCategoriaMae() {
+        return categoriaMae;
+    }
+
+    public Categoria converter(CategoriaRepository repository) {
+        Categoria categoria = null;
+        if(this.categoriaMae != null){
+            categoria = repository.findById(this.categoriaMae).get();
+        }
+        return new Categoria(this.nome, categoria);
+    }
+}

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

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+package br.com.zupacademy.fabiano.mercadolivre.modelo;
+
+import javax.persistence.*;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+
+@Entity
+public class Categoria {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    @NotNull
+    @NotEmpty
+    @Column(nullable = false, unique = true)
+    private String nome;
+    @ManyToOne
+    private Categoria categoriaMae;
+
+    public Categoria() {
+    }
+
+    public Categoria(@NotNull @NotEmpty String nome,
+                     Categoria categoriaMae) {
+        this.nome = nome;
+        this.categoriaMae = categoriaMae;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getNome() {
+        return nome;
+    }
+
+    public Categoria getCategoriaMae() {
+        return categoriaMae;
+    }
+}

src/main/java/br/com/zupacademy/fabiano/mercadolivre/repository/CategoriaRepository.java

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+package br.com.zupacademy.fabiano.mercadolivre.repository;
+
+import br.com.zupacademy.fabiano.mercadolivre.modelo.Categoria;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CategoriaRepository extends JpaRepository<Categoria, Long> {
+}

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

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+package br.com.zupacademy.fabiano.mercadolivre.validator;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = ChecaExistenciaValidator.class)
+@Target({ ElementType.FIELD })
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ChecaExistencia {
+    String message() default "Instancia não encontrada";
+    Class<?>[] groups() default {};
+    Class<? extends Payload>[] payload() default {};
+    String identityField();
+    Class instanceClass();
+}
+

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

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