Method Details

• getEmptyValue

  public BigDecimal getEmptyValue()

  Description copied from interface: HasValue

  Returns the value that represents an empty value.

  By default HasValue is expected to support null as empty values. Specific implementations might not support this.

  Specified by:

  getEmptyValue in interface HasValue<AbstractField.ComponentValueChangeEvent<BigDecimalField,BigDecimal>,BigDecimal>

  Overrides:

  getEmptyValue in class AbstractField<BigDecimalField,BigDecimal>

  Returns:

  empty value

• setValue

  public void setValue(BigDecimal value)

  Sets the value of this field. If the new value is not equal to getValue(), fires a value change event.

  You can adjust how the value is presented in the field with the APIs provided by the value type BigDecimal. For example, you can change the number of decimal places with BigDecimal.setScale(int). This doesn't however restrict the user from entering values with different number of decimals. Note that BigDecimals are immutable, so their methods will return new instances instead of editing the existing ones. Scientific notation (such as 1e9) is turned into plain number format for the presentation.

  Specified by:

  setValue in interface HasValue<AbstractField.ComponentValueChangeEvent<BigDecimalField,BigDecimal>,BigDecimal>

  Overrides:

  setValue in class AbstractField<BigDecimalField,BigDecimal>

  Parameters:

  value - the new value

• getValue

  public BigDecimal getValue()

  Returns the current value of the field. By default, the empty BigDecimalField will return null.

  Specified by:

  getValue in interface HasValue<AbstractField.ComponentValueChangeEvent<BigDecimalField,BigDecimal>,BigDecimal>

  Overrides:

  getValue in class AbstractField<BigDecimalField,BigDecimal>

  Returns:

  the current value.

• validate

  protected void validate()

  Performs server-side validation of the current value. This is needed because it is possible to circumvent the client-side validation constraints using browser development tools.

• getDefaultValidator

  public Validator<BigDecimal> getDefaultValidator()

  Description copied from interface: HasValidator

  Returns a validator that checks the state of the Value. This should be overridden for components with internal value conversion or validation, e.g. when the user is providing a string that has to be parsed into a date. An invalid input from user will be exposed to a Binder and can be seen as a validation failure.

  Specified by:

  getDefaultValidator in interface HasValidator<BigDecimal>

  Returns:

  state validator

• addValidationStatusChangeListener

  public Registration addValidationStatusChangeListener(ValidationStatusChangeListener<BigDecimal> listener)

  Description copied from interface: HasValidator

  Enables the implementing components to notify changes in their validation status to the observers.

  Note: This method can be overridden by the implementing classes e.g. components, to enable the associated Binder.Binding instance subscribing for their validation change events and revalidate itself.

  This method primarily designed for notifying the Binding about the validation status changes of a bound component at the client-side. WebComponents such as <vaadin-date-picker> or any other component that accept a formatted text as input should be able to communicate their invalid status to their server-side instance, and a bound server-side component instance must notify its binding about this validation status change as well. When the binding instance revalidates, a chain of validators and convertors get executed one of which is the default validator provided by HasValidator.getDefaultValidator(). Thus, In order for the binding to be able to show/clear errors for its associated bound field, it is important that implementing components take that validation status into account while implementing any validator and converter including HasValidator.getDefaultValidator(). Here is an example:

   @Tag("date-picker-demo")
   public class DatePickerDemo implements HasValidator<LocalDate> {
  
       // Each web component has a way to communicate its validation status
       // to its server-side component instance. The following clientSideValid
       // state is introduced here just for the sake of simplicity of this code
       // snippet:
       boolean clientSideValid = true;
  
       /**
        * Note how clientSideValid engaged in the definition
        * of this method. It is important to reflect this status either
        * in the returning validation result of this method or any other
        * validation that is associated with this component.
        */
       @Override
       public Validator getDefaultValidator() {
            return (value, valueContext) -> clientSideValid ? ValidationResult.ok()
                   : ValidationResult.error("Invalid date format");
       }
  
       private final Collection<ValidationStatusChangeListener<LocalDate>>
           validationStatusListeners = new ArrayList<>();
  
       /**
        * This enables the binding to subscribe for the validation status
        * change events that are fired by this component and revalidate
        * itself respectively.
        */
       @Override
       public Registration addValidationStatusChangeListener(
               ValidationStatusChangeListener<LocalDate> listener) {
           validationStatusListeners.add(listener);
           return () -> validationStatusListeners.remove(listener);
       }
  
       private void fireValidationStatusChangeEvent(
               boolean newValidationStatus) {
           if (this.clientSideValid != newValidationStatus) {
               this.clientSideValid = newValidationStatus;
               var event = new ValidationStatusChangeEvent<>(this,
                       newValidationStatus);
               validationStatusListeners.forEach(
                       listener -> listener.validationStatusChanged(event));
           }
       }
   }
   

  Specified by:

  addValidationStatusChangeListener in interface HasValidator<BigDecimal>

  Returns:

  Registration of the added listener.

  See Also:

  • Binder.BindingBuilderImpl.bind(ValueProvider, Setter)

• setLocale

  public void setLocale(Locale locale)

  Sets the locale for this BigDecimalField. It is used to determine which decimal separator (the radix point) should be used.

  Parameters:

  locale - the locale to set, not null

• getLocale

  public Locale getLocale()

  Gets the locale used by this BigDecimalField. It is used to determine which decimal separator (the radix point) should be used.

  Overrides:

  getLocale in class Component

  Returns:

  the locale of this field, never null

• onAttach

  protected void onAttach(AttachEvent attachEvent)

  Description copied from class: Component

  Called when the component is attached to a UI.

  The default implementation does nothing.

  This method is invoked before the AttachEvent is fired for the component.

  Overrides:

  onAttach in class Component

  Parameters:

  attachEvent - the attach event