vaadin-framework/server/src/test/java/com/vaadin/data/BinderTest.java

package com.vaadin.data;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

import java.util.Locale;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.vaadin.data.Binder.BindingBuilder;
import com.vaadin.data.util.converter.StringToIntegerConverter;
import com.vaadin.data.validator.NotEmptyValidator;
import com.vaadin.server.ErrorMessage;
import com.vaadin.tests.data.bean.Person;
import com.vaadin.tests.data.bean.Sex;
import com.vaadin.ui.TextField;

public class BinderTest extends BinderTestBase<Binder<Person>, Person> {

    @Before
    public void setUp() {
        binder = new Binder<>();
        item = new Person();
        item.setFirstName("Johannes");
        item.setAge(32);
    }

    @Test
    public void bindNullBean_noBeanPresent() {
        binder.setBean(item);
        assertTrue(binder.getBean().isPresent());

        binder.setBean(null);
        assertFalse(binder.getBean().isPresent());
    }

    @Test(expected = NullPointerException.class)
    public void bindNullField_throws() {
        binder.forField(null);
    }

    @Test(expected = NullPointerException.class)
    public void bindNullGetter_throws() {
        binder.bind(nameField, null, Person::setFirstName);
    }

    @Test
    public void fieldBound_bindItem_fieldValueUpdated() {
        binder.forField(nameField).bind(Person::getFirstName,
                Person::setFirstName);
        binder.setBean(item);
        assertEquals("Johannes", nameField.getValue());
    }

    @Test
    public void fieldBoundWithShortcut_bindBean_fieldValueUpdated() {
        bindName();
        assertEquals("Johannes", nameField.getValue());
    }

    @Test
    public void beanBound_updateFieldValue_beanValueUpdated() {
        binder.setBean(item);
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        assertEquals("Johannes", nameField.getValue());
        nameField.setValue("Artur");
        assertEquals("Artur", item.getFirstName());
    }

    @Test
    public void bound_getBean_returnsBoundBean() {
        assertFalse(binder.getBean().isPresent());
        binder.setBean(item);
        assertSame(item, binder.getBean().get());
    }

    @Test
    public void unbound_getBean_returnsNothing() {
        binder.setBean(item);
        binder.removeBean();
        assertFalse(binder.getBean().isPresent());
    }

    @Test
    public void bound_changeFieldValue_beanValueUpdated() {
        bindName();
        nameField.setValue("Henri");
        assertEquals("Henri", item.getFirstName());
    }

    @Test
    public void unbound_changeFieldValue_beanValueNotUpdated() {
        bindName();
        nameField.setValue("Henri");
        binder.removeBean();
        nameField.setValue("Aleksi");
        assertEquals("Henri", item.getFirstName());
    }

    @Test
    public void bindNullSetter_valueChangesIgnored() {
        binder.bind(nameField, Person::getFirstName, null);
        binder.setBean(item);
        nameField.setValue("Artur");
        assertEquals(item.getFirstName(), "Johannes");
    }

    @Test
    public void bound_bindToAnotherBean_stopsUpdatingOriginal() {
        bindName();
        nameField.setValue("Leif");

        Person p2 = new Person();
        p2.setFirstName("Marlon");
        binder.setBean(p2);
        assertEquals("Marlon", nameField.getValue());
        assertEquals("Leif", item.getFirstName());
        assertSame(p2, binder.getBean().get());

        nameField.setValue("Ilia");
        assertEquals("Ilia", p2.getFirstName());
        assertEquals("Leif", item.getFirstName());
    }

    @Test
    public void save_unbound_noChanges() throws ValidationException {
        Binder<Person> binder = new Binder<>();
        Person person = new Person();

        int age = 10;
        person.setAge(age);

        binder.writeBean(person);

        Assert.assertEquals(age, person.getAge());
    }

    @Test
    public void save_bound_beanIsUpdated() throws ValidationException {
        Binder<Person> binder = new Binder<>();
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        Person person = new Person();

        String fieldValue = "bar";
        nameField.setValue(fieldValue);

        person.setFirstName("foo");

        binder.writeBean(person);

        Assert.assertEquals(fieldValue, person.getFirstName());
    }

    @Test
    public void load_bound_fieldValueIsUpdated() {
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        Person person = new Person();

        String name = "bar";
        person.setFirstName(name);
        binder.readBean(person);

        Assert.assertEquals(name, nameField.getValue());
    }

    @Test
    public void load_unbound_noChanges() {
        nameField.setValue("");

        Person person = new Person();

        String name = "bar";
        person.setFirstName(name);
        binder.readBean(person);

        Assert.assertEquals("", nameField.getValue());
    }

    protected void bindName() {
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);
        binder.setBean(item);
    }

    @Test
    public void binding_with_null_representation() {
        String nullRepresentation = "Some arbitrary text";
        String realName = "John";
        Person namelessPerson = new Person(null, "Doe", "", 25, Sex.UNKNOWN,
                null);

        binder.forField(nameField).withNullRepresentation(nullRepresentation)
                .bind(Person::getFirstName, Person::setFirstName);

        // Bind a person with null value and check that null representation is
        // used
        binder.setBean(namelessPerson);
        Assert.assertEquals(
                "Null value from bean was not converted to explicit null representation",
                nullRepresentation, nameField.getValue());

        // Verify that changes are applied to bean
        nameField.setValue(realName);
        Assert.assertEquals(
                "Bean was not correctly updated from a change in the field",
                realName, namelessPerson.getFirstName());

        // Verify conversion back to null
        nameField.setValue(nullRepresentation);
        Assert.assertEquals(
                "Two-way null representation did not change value back to null",
                null, namelessPerson.getFirstName());
    }

    @Test
    public void binding_with_default_null_representation() {
        TextField nullTextField = new TextField() {
            @Override
            public String getEmptyValue() {
                return "null";
            }
        };

        Person namelessPerson = new Person(null, "Doe", "", 25, Sex.UNKNOWN,
                null);
        binder.bind(nullTextField, Person::getFirstName, Person::setFirstName);
        binder.setBean(namelessPerson);

        Assert.assertTrue(nullTextField.isEmpty());
        Assert.assertEquals(null, namelessPerson.getFirstName());

        // Change value, see that textfield is not empty and bean is updated.
        nullTextField.setValue("");
        Assert.assertFalse(nullTextField.isEmpty());
        Assert.assertEquals("First name of person was not properly updated", "",
                namelessPerson.getFirstName());

        // Verify that default null representation does not map back to null
        nullTextField.setValue("null");
        Assert.assertTrue(nullTextField.isEmpty());
        Assert.assertEquals("Default one-way null representation failed.",
                "null", namelessPerson.getFirstName());
    }

    @Test
    public void binding_with_null_representation_value_not_null() {
        String nullRepresentation = "Some arbitrary text";

        binder.forField(nameField).withNullRepresentation(nullRepresentation)
                .bind(Person::getFirstName, Person::setFirstName);

        Assert.assertFalse("First name in item should not be null",
                Objects.isNull(item.getFirstName()));
        binder.setBean(item);

        Assert.assertEquals("Field value was not set correctly",
                item.getFirstName(), nameField.getValue());
    }

    @Test
    public void withConverter_disablesDefaulNullRepresentation() {
        Integer customNullConverter = 0;
        binder.forField(ageField).withNullRepresentation("foo")
                .withConverter(new StringToIntegerConverter(""))
                .withConverter(age -> age,
                        age -> age == null ? customNullConverter : age)
                .bind(Person::getSalary, Person::setSalary);
        binder.setBean(item);

        Assert.assertEquals(customNullConverter.toString(),
                ageField.getValue());

        Integer salary = 11;
        ageField.setValue(salary.toString());
        Assert.assertEquals(11, salary.intValue());
    }

    @Test
    public void beanBinder_nullRepresentationIsNotDisabled() {
        BeanBinder<Person> binder = new BeanBinder<>(Person.class);
        binder.forField(nameField).bind("firstName");

        Person person = new Person();
        binder.setBean(person);

        Assert.assertEquals("", nameField.getValue());
    }

    @Test
    public void beanBinder_withConverter_nullRepresentationIsNotDisabled() {
        String customNullPointerRepresentation = "foo";
        BeanBinder<Person> binder = new BeanBinder<>(Person.class);
        binder.forField(nameField)
                .withConverter(value -> value, value -> value == null
                        ? customNullPointerRepresentation : value)
                .bind("firstName");

        Person person = new Person();
        binder.setBean(person);

        Assert.assertEquals(customNullPointerRepresentation,
                nameField.getValue());
    }

    @Test
    public void withValidator_doesNotDisablesDefaulNullRepresentation() {
        String nullRepresentation = "foo";
        binder.forField(nameField).withNullRepresentation(nullRepresentation)
                .withValidator(new NotEmptyValidator<>(""))
                .bind(Person::getFirstName, Person::setFirstName);
        item.setFirstName(null);
        binder.setBean(item);

        Assert.assertEquals(nullRepresentation, nameField.getValue());

        String newValue = "bar";
        nameField.setValue(newValue);
        Assert.assertEquals(newValue, item.getFirstName());
    }

    @Test
    public void setRequired_withErrorMessage_fieldGetsRequiredIndicatorAndValidator() {
        TextField textField = new TextField();
        Assert.assertFalse(textField.isRequiredIndicatorVisible());

        BindingBuilder<Person, String> binding = binder.forField(textField);
        Assert.assertFalse(textField.isRequiredIndicatorVisible());

        binding.setRequired("foobar");
        Assert.assertTrue(textField.isRequiredIndicatorVisible());

        binding.bind(Person::getFirstName, Person::setFirstName);
        binder.setBean(item);
        Assert.assertNull(textField.getErrorMessage());

        textField.setValue(textField.getEmptyValue());
        ErrorMessage errorMessage = textField.getErrorMessage();
        Assert.assertNotNull(errorMessage);
        Assert.assertEquals("foobar", errorMessage.getFormattedHtmlMessage());

        textField.setValue("value");
        Assert.assertNull(textField.getErrorMessage());
        Assert.assertTrue(textField.isRequiredIndicatorVisible());
    }

    @Test
    public void setRequired_withErrorMessageProvider_fieldGetsRequiredIndicatorAndValidator() {
        TextField textField = new TextField();
        textField.setLocale(Locale.CANADA);
        Assert.assertFalse(textField.isRequiredIndicatorVisible());

        BindingBuilder<Person, String> binding = binder.forField(textField);
        Assert.assertFalse(textField.isRequiredIndicatorVisible());
        AtomicInteger invokes = new AtomicInteger();

        binding.setRequired(context -> {
            invokes.incrementAndGet();
            Assert.assertSame(Locale.CANADA, context.getLocale().get());
            return "foobar";
        });
        Assert.assertTrue(textField.isRequiredIndicatorVisible());

        binding.bind(Person::getFirstName, Person::setFirstName);
        binder.setBean(item);
        Assert.assertNull(textField.getErrorMessage());
        Assert.assertEquals(0, invokes.get());

        textField.setValue(textField.getEmptyValue());
        ErrorMessage errorMessage = textField.getErrorMessage();
        Assert.assertNotNull(errorMessage);
        Assert.assertEquals("foobar", errorMessage.getFormattedHtmlMessage());
        // validation is run twice, once for the field, then for all the fields
        // for cross field validation...
        Assert.assertEquals(2, invokes.get());

        textField.setValue("value");
        Assert.assertNull(textField.getErrorMessage());
        Assert.assertTrue(textField.isRequiredIndicatorVisible());
    }

    @Test
    public void validationStatusHandler_onlyRunForChangedField() {
        TextField firstNameField = new TextField();
        TextField lastNameField = new TextField();

        AtomicInteger invokes = new AtomicInteger();

        binder.forField(firstNameField)
                .withValidator(new NotEmptyValidator<>(""))
                .withValidationStatusHandler(
                        validationStatus -> invokes.addAndGet(1))
                .bind(Person::getFirstName, Person::setFirstName);
        binder.forField(lastNameField)
                .withValidator(new NotEmptyValidator<>(""))
                .bind(Person::getLastName, Person::setLastName);

        binder.setBean(item);
        // setting the bean causes 2:
        Assert.assertEquals(2, invokes.get());

        lastNameField.setValue("");
        Assert.assertEquals(2, invokes.get());

        firstNameField.setValue("");
        Assert.assertEquals(3, invokes.get());

        binder.removeBean();
        Person person = new Person();
        person.setFirstName("a");
        person.setLastName("a");
        binder.readBean(person);
        // reading from a bean causes 2:
        Assert.assertEquals(5, invokes.get());

        lastNameField.setValue("");
        Assert.assertEquals(5, invokes.get());

        firstNameField.setValue("");
        Assert.assertEquals(6, invokes.get());
    }
}