Binding.validate() should fire a validation status event (#134).

Change-Id: I2121ec8f90ffcdf2fdfa02bf99084b539b27180e

server/src/main/java/com/vaadin/data/Binder.java

@@ -485,6 +485,7 @@ public class Binder<BEAN> implements Serializable {
             FIELDVALUE fieldValue = field.getValue();
             Result<TARGET> dataValue = converterValidatorChain.convertToModel(
                     fieldValue, ((AbstractComponent) field).getLocale());
+            fireStatusChangeEvent(dataValue);
             return dataValue;
         }
 
@@ -554,7 +555,7 @@ public class Binder<BEAN> implements Serializable {
             return newBinding;
         }
 
-        private void fireStatusChangeEvent(Result<?> result) {
+        private void fireStatusChangeEvent(Result<TARGET> result) {
             ValidationStatusChangeEvent event = new ValidationStatusChangeEvent(
                     getField(),
                     result.isError() ? ValidationStatus.ERROR
@@ -716,7 +717,6 @@ public class Binder<BEAN> implements Serializable {
         List<ValidationError<?>> resultErrors = new ArrayList<>();
         for (BindingImpl<BEAN, ?, ?> binding : bindings) {
             Result<?> result = binding.validate();
-            binding.fireStatusChangeEvent(result);
             result.ifError(errorMessage -> resultErrors
                     .add(new ValidationError<>(binding.field, errorMessage)));
         }

server/src/test/java/com/vaadin/data/BinderBookOfVaadinTest.java

@@ -256,7 +256,7 @@ public class BinderBookOfVaadinTest {
     }
 
     @Test
-    public void crossFieldValidation() {
+    public void crossFieldValidation_validateUsingBinder() {
         Binder<Trip> binder = new Binder<>();
         PopupDateField departing = new PopupDateField("Departing");
         PopupDateField returning = new PopupDateField("Returning");
@@ -310,6 +310,56 @@ public class BinderBookOfVaadinTest {
 
     }
 
+    @Test
+    public void crossFieldValidation_validateUsingBinding() {
+        Binder<Trip> binder = new Binder<>();
+        PopupDateField departing = new PopupDateField("Departing");
+        PopupDateField returning = new PopupDateField("Returning");
+
+        Binding<Trip, Date, Date> returnBinding = binder.forField(returning)
+                .withValidator(
+                        returnDate -> !returnDate.before(departing.getValue()),
+                        "Cannot return before departing");
+
+        returnBinding.bind(Trip::getReturnDate, Trip::setReturnDate);
+        departing.addValueChangeListener(event -> returnBinding.validate());
+
+        Calendar calendar = Calendar.getInstance();
+        Date past = calendar.getTime();
+        calendar.add(1, Calendar.DAY_OF_YEAR);
+        Date before = calendar.getTime();
+        calendar.add(1, Calendar.DAY_OF_YEAR);
+        Date after = calendar.getTime();
+
+        departing.setValue(before);
+        returning.setValue(after);
+
+        Result<Date> result = returnBinding.validate();
+        Assert.assertFalse(result.isError());
+        Assert.assertNull(departing.getComponentError());
+
+        // update returning => validation is done against this field
+        returning.setValue(past);
+        result = returnBinding.validate();
+
+        Assert.assertTrue(result.isError());
+        Assert.assertNotNull(returning.getComponentError());
+
+        // set correct value back
+        returning.setValue(before);
+        result = returnBinding.validate();
+
+        Assert.assertFalse(result.isError());
+        Assert.assertNull(departing.getComponentError());
+
+        // update departing => validation is done because of listener added
+        departing.setValue(after);
+        result = returnBinding.validate();
+
+        Assert.assertTrue(result.isError());
+        Assert.assertNotNull(returning.getComponentError());
+    }
+
     @Test
     public void withStatusLabelExample() {
         Label emailStatus = new Label();

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

@@ -460,6 +460,25 @@ public class BinderTest {
         Assert.assertNull(nameField.getComponentError());
     }
 
+    @Test
+    public void bindingWithStatusChangeHandler_defaultStatusChangeHandlerIsReplaced() {
+        Binding<Person, String, String> binding = binder.forField(nameField)
+                .withValidator(notEmpty).withStatusChangeHandler(evt -> {
+                });
+        binding.bind(Person::getFirstName, Person::setLastName);
+
+        Assert.assertNull(nameField.getComponentError());
+
+        nameField.setValue("");
+
+        // First validation fails => should be event with ERROR status and
+        // message
+        binding.validate();
+
+        // default behavior should update component error for the nameField
+        Assert.assertNull(nameField.getComponentError());
+    }
+
     @Test
     public void withStatusLabel_labelIsUpdatedAccordingStatus() {
         Label label = new Label();
@@ -487,6 +506,33 @@ public class BinderTest {
         Assert.assertEquals("", label.getValue());
     }
 
+    @Test
+    public void bindingWithStatusLabel_labelIsUpdatedAccordingStatus() {
+        Label label = new Label();
+
+        Binding<Person, String, String> binding = binder.forField(nameField)
+                .withValidator(notEmpty).withStatusLabel(label);
+        binding.bind(Person::getFirstName, Person::setLastName);
+
+        nameField.setValue("");
+
+        // First validation fails => should be event with ERROR status and
+        // message
+        binding.validate();
+
+        Assert.assertTrue(label.isVisible());
+        Assert.assertEquals("Value cannot be empty", label.getValue());
+
+        nameField.setValue("foo");
+
+        // Second validation succeeds => should be event with OK status and
+        // no message
+        binding.validate();
+
+        Assert.assertFalse(label.isVisible());
+        Assert.assertEquals("", label.getValue());
+    }
+
     @Test
     public void withStatusLabel_defaultStatusChangeHandlerIsReplaced() {
         Label label = new Label();
@@ -507,6 +553,26 @@ public class BinderTest {
         Assert.assertNull(nameField.getComponentError());
     }
 
+    @Test
+    public void bindingWithStatusLabel_defaultStatusChangeHandlerIsReplaced() {
+        Label label = new Label();
+
+        Binding<Person, String, String> binding = binder.forField(nameField)
+                .withValidator(notEmpty).withStatusLabel(label);
+        binding.bind(Person::getFirstName, Person::setLastName);
+
+        Assert.assertNull(nameField.getComponentError());
+
+        nameField.setValue("");
+
+        // First validation fails => should be event with ERROR status and
+        // message
+        binding.validate();
+
+        // default behavior should update component error for the nameField
+        Assert.assertNull(nameField.getComponentError());
+    }
+
     @Test(expected = IllegalStateException.class)
     public void withStatusChangeHandler_addAfterBound() {
         Binding<Person, String, String> binding = binder.forField(nameField)