io.github.manuelarte.spring.manuelartevalidation.validators.ExistsValidator Maven / Gradle / Ivy

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Useful constraints.

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package io.github.manuelarte.spring.manuelartevalidation.validators;

import io.github.manuelarte.spring.manuelartevalidation.constraints.Exists;
import java.util.List;
import java.util.Objects;
import java.util.stream.StreamSupport;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.NotNull;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.core.ResolvableType;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Component;

@Component
@Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
@lombok.RequiredArgsConstructor
public class ExistsValidator implements ConstraintValidator {

  @lombok.NonNull
  private final List> repositories;
  private CrudRepository repository;

  @Override
  public void initialize(@NotNull final Exists exists) {
    this.repository = (CrudRepository) repositories.stream().filter(it -> Objects
        .requireNonNull(ResolvableType.forClass(it.getClass())
            .as(CrudRepository.class).getGeneric(0).resolve()).equals(exists.value()))
        .findFirst().orElse(null);
  }

  @Override
  public boolean isValid(final Object id, final ConstraintValidatorContext cxt) {
    if (repository == null) {
      cxt.buildConstraintViolationWithTemplate("Can't find the repository for the entity");
      return false;
    }
    if ( !(id == null
        || id instanceof Iterable
        || id.getClass().equals(repositoryIdClass()))) {
      cxt.buildConstraintViolationWithTemplate(String.format("%s is not the expected id type of %s",
          id.getClass(), repositoryIdClass()));
      return false;
    }
    return id == null
        || (!(id instanceof Iterable)
        ? repository.existsById(id)
        : existsIterableIds((Iterable