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

            new ClassPathXmlApplicationContext("org/springmodules/validation/bean/beanValidator-tests.xml");


        Person person = new Person("Uri");
        BindException errors = new BindException(person, "person");


        Validator validator = (Validator)context.getBean("validator");
        validator.validate(person, errors);


        assertTrue(errors.hasGlobalErrors());
        assertEquals(1, errors.getGlobalErrorCount());
        assertEquals("Person[bad]", errors.getGlobalError().getCode());

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        Person person = new Person("Uri");
        person.setPhone("1234"); // should be validation error - length < 7
        BindException errors = new BindException(person, "person");


        Validator validator = (Validator)context.getBean("validator");
        validator.validate(person, errors);


        assertTrue(errors.hasFieldErrors("phone"));
        assertEquals(1, errors.getFieldErrorCount("phone"));
        assertEquals("Person.phone[min.length]", errors.getFieldError("phone").getCode());
    }

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    }


    protected void validatePage(Object command, Errors errors, int page) {
        Validator[] validators = getValidators();
        for (int i=0; i<validators.length; i++) {
            Validator validator = validators[i];
            if (validator instanceof PageAware) {
                if (((PageAware)validator).getPage() == page) {
                    validator.validate(command, errors);
                }
            }
        }
    }

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  /**
   * Verify that the handler works correctly (i.e. no-op) with a 
   * {@link org.springframework.validation.Validator native} validator. 
   */
  public void testWithNonValangValidators() throws Exception {
    Validator plainValidator = new Validator() {
      public boolean supports(Class arg0) {
        return false;
      }


      public void validate(Object arg0, Errors arg1) {

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        }
    }


    public void testConditionRef_WhenDeployedInApplicationContext() throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("appCtxt.xml", getClass());
        Validator validator = (Validator)context.getBean("validator");


        TeztBean2 bean = new TeztBean2();
        BindException errors = new BindException(bean, "bean");
        validator.validate(bean, errors);
        assertTrue(errors.hasErrors());
        assertTrue(errors.hasFieldErrors("name"));


        bean = new TeztBean2("test");
        errors = new BindException(bean, "bean");
        validator.validate(bean, errors);
        assertFalse(errors.hasErrors());


    }

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        if (applicationContext == null) {
            throw new UnsupportedOperationException(VALIDATOR_BEAN_TAG + " configuration cannot be applied for " +
                "this configuration loader was not deployed in an application context");
        }
        String beanName = definition.getAttribute(NAME_ATTR);
        Validator validator = (Validator)applicationContext.getBean(beanName, Validator.class);
        configuration.addCustomValidator(validator);
    }

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    public void testApplyCustomValidator() throws Exception {
        Object object = new Object();


        MockControl customValidatorControl = MockControl.createControl(Validator.class);
        Validator customValidator = (Validator) customValidatorControl.getMock();
        customValidator.validate(object, errors);
        configurationControl.expectAndReturn(configuration.getCustomValidator(), customValidator);


        replay();
        validator.applyCustomValidator(configuration, object, errors);
        verify();

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     *             if the controller's validator is not an instance of
     *             {@link org.springmodules.validation.valang.ValangValidator}
     */
    public static void addValangRulesToModel(BaseCommandController controller, Map model) {
        Assert.hasText(controller.getCommandName(), "controller must define a command name");
        Validator validator = controller.getValidator();
        Assert.isInstanceOf(ValangValidator.class, validator, "controller's validator of class '"
                + (validator != null ? validator.getClass().getName() : "[null]")
                + "' must be an instance of 'ValangValidator'");
        ValangValidator vv = (ValangValidator) validator;
        addValangRulesToModel(controller.getCommandName(), vv.getRules(), model);
    }

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            new ClassPathXmlApplicationContext("org/springmodules/validation/bean/beanValidator-tests.xml");


        Person person = new Person("Uri");
        BindException errors = new BindException(person, "person");


        Validator validator = (Validator) context.getBean("validator");
        validator.validate(person, errors);


        assertTrue(errors.hasGlobalErrors());
        assertEquals(1, errors.getGlobalErrorCount());
        assertEquals("Person[bad]", errors.getGlobalError().getCode());

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        Person person = new Person("Uri");
        person.setPhone("1234"); // should be validation error - length < 7
        BindException errors = new BindException(person, "person");


        Validator validator = (Validator) context.getBean("validator");
        validator.validate(person, errors);


        assertTrue(errors.hasFieldErrors("phone"));
        assertEquals(1, errors.getFieldErrorCount("phone"));
        assertEquals("Person.phone[min.length]", errors.getFieldError("phone").getCode());
    }

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