Examples of org.springframework.validation.Validator

org.springframework.validation.Validator
A validator for application-specific objects.
This interface is totally divorced from any infrastructure or context; that is to say it is not coupled to validating only objects in the web tier, the data-access tier, or the whatever-tier. As such it is amenable to being used in any layer of an application, and supports the encapsulation of validation logic as first-class citizens in their own right.
Find below a simple but complete Validator implementation, which validates that the various {@link String}properties of a UserLogin instance are not empty (that is they are not null and do not consist wholly of whitespace), and that any password that is present is at least 'MINIMUM_PASSWORD_LENGTH' characters in length.
```
 public class UserLoginValidator implements Validator { private static final int MINIMUM_PASSWORD_LENGTH = 6; public boolean supports(Class clazz) { return UserLogin.class.isAssignableFrom(clazz); } public void validate(Object target, Errors errors) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "userName", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "field.required"); UserLogin login = (UserLogin) target; if (login.getPassword() != null && login.getPassword().trim().length() < MINIMUM_PASSWORD_LENGTH) { errors.rejectValue("password", "field.min.length", new Object[]{Integer.valueOf(MINIMUM_PASSWORD_LENGTH)}, "The password must be at least [" + MINIMUM_PASSWORD_LENGTH + "] characters in length."); } } }
```
See also the Spring reference manual for a fuller discussion of the Validator interface and it's role in a enterprise application. @author Rod Johnson @see Errors @see ValidationUtils


  private BindException validate(SignupForm form) {
    BindException errors;
    errors = new BindException(form, "signupForm");
    LazyValidatorFactory lvf = new LazyValidatorFactory();
    Validator validator = new SpringValidatorAdapter(lvf.getValidator());
    ValidationUtils.invokeValidator(validator, form, errors);
    return errors;
  }

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  @Override
  public Validator getValidator() {
    List<Validator> candidates = new ArrayList<Validator>();
    for (WebMvcConfigurer configurer : this.delegates) {
      Validator validator = configurer.getValidator();
      if (validator != null) {
        candidates.add(validator);
      }
    }
    return selectSingleInstance(candidates, Validator.class);

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   * before creating a {@code OptionalValidatorFactoryBean}.If a JSR-303
   * implementation is not available, a no-op {@link Validator} is returned.
   */
  @Bean
  public Validator mvcValidator() {
    Validator validator = getValidator();
    if (validator == null) {
      if (ClassUtils.isPresent("javax.validation.Validator", getClass().getClassLoader())) {
        Class<?> clazz;
        try {
          String className = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";

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    ConversionService conversionService = initializer.getConversionService();
    assertNotNull(conversionService);
    assertTrue(conversionService instanceof FormattingConversionService);


    Validator validator = initializer.getValidator();
    assertNotNull(validator);
    assertTrue(validator instanceof LocalValidatorFactoryBean);


    DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(adapter);
    List<Object> interceptors = (List<Object>) fieldAccessor.getPropertyValue("responseBodyAdvice");

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    assertThat(config.simpValidator(), Matchers.instanceOf(OptionalValidatorFactoryBean.class));
  }


  @Test
  public void simpValidatorCustom() {
    final Validator validator = mock(Validator.class);
    AbstractMessageBrokerConfiguration config = new AbstractMessageBrokerConfiguration() {
      @Override
      public Validator getValidator() {
        return validator;
      }

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      converters.add(new MappingJackson2HttpMessageConverter());
    }


    @Override
    public Validator getValidator() {
      return new Validator() {
        @Override
        public void validate(Object target, Errors errors) {
          errors.reject("invalid");
        }
        @Override

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      }
    }


    @Override
    public Validator mvcValidator() {
      Validator mvcValidator = (validator != null) ? validator : super.mvcValidator();
      if (mvcValidator instanceof InitializingBean) {
        try {
          ((InitializingBean) mvcValidator).afterPropertiesSet();
        }
        catch (Exception e) {

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    factory.setBeanFactory(new StaticListableBeanFactory());
    factory.afterPropertiesSet();
  }


  private Validator testValidator(final String invalidValue) {
    return new Validator() {
      @Override
      public boolean supports(Class<?> clazz) {
        return String.class.isAssignableFrom(clazz);
      }
      @Override

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   * before creating a {@code OptionalValidatorFactoryBean}</li>
   * <li>returning a no-op Validator instance</li>
   * </ul>
   */
  protected Validator simpValidator() {
    Validator validator = getValidator();
    if (validator == null) {
      if (this.applicationContext.containsBean(MVC_VALIDATOR_NAME)) {
        validator = this.applicationContext.getBean(MVC_VALIDATOR_NAME, Validator.class);
      }
      else if (ClassUtils.isPresent("javax.validation.Validator", getClass().getClassLoader())) {
        Class<?> clazz;
        try {
          String className = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";
          clazz = ClassUtils.forName(className, AbstractMessageBrokerConfiguration.class.getClassLoader());
        }
        catch (Throwable ex) {
          throw new BeanInitializationException("Could not find default validator class", ex);
        }
        validator = (Validator) BeanUtils.instantiate(clazz);
      }
      else {
        validator = new Validator() {
          @Override
          public boolean supports(Class<?> clazz) {
            return false;
          }
          @Override

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        allErrors = new HashMap<String,Errors>();
            
        for(Entry<String, HasValidator> entry : getBeansOfType(HasValidator.class).entrySet()) {
            String name = entry.getKey();
            HasValidator hv = entry.getValue();
            Validator v = hv.getValidator();
            Errors errors = new BeanPropertyBindingResult(hv,name);
            v.validate(hv, errors);
            if(errors.hasErrors()) {
                allErrors.put(name,errors);
            }
        }
        for(String name : allErrors.keySet()) {

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