com.holonplatform.vaadin7.components.ValidationStatusHandler Maven / Gradle / Ivy
/*
* Copyright 2000-2017 Holon TDCN.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.holonplatform.vaadin7.components;
import java.io.Serializable;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import com.holonplatform.core.i18n.Localizable;
import com.holonplatform.core.i18n.LocalizationContext;
import com.holonplatform.core.property.Property;
import com.holonplatform.vaadin7.internal.components.DefaultValidationStatusHandler;
import com.holonplatform.vaadin7.internal.components.LabelValidationStatusHandler;
import com.holonplatform.vaadin7.internal.components.NotificationValidationStatusHandler;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Label;
import com.vaadin.ui.Notification;
/**
* Handler for validation status change events, typically bound to a {@link ValueComponent} source object.
*
* @since 5.0.0
*/
@FunctionalInterface
public interface ValidationStatusHandler {
/**
* Invoked when the validation status has changed.
* @param statusChangeEvent the changed status event, providing validation status, error message and the optional
* source component
*/
void validationStatusChange(ValidationStatusEvent statusChangeEvent);
/**
* Create and return the default {@link ValidationStatusHandler}.
*
* The default validation status handler uses
* {@link AbstractComponent#setComponentError(com.vaadin.server.ErrorMessage)} to notify the validation status on
* the value component against whom the validation is performed, if it is available and the component returned by
* {@link ValueComponent#getComponent()} is an {@link AbstractComponent} instance.
*
* @return A new default {@link ValidationStatusHandler} instance
*/
static ValidationStatusHandler getDefault() {
return new DefaultValidationStatusHandler();
}
/**
* Create a {@link ValidationStatusHandler} which uses a {@link Label} to notify validation errors.
*
* By default, the status {@link Label} is set to visible only when the validation status is invalid, i.e. a
* validation error to display is available.
*
* @param statusLabel The {@link Label} to use to notify validation errors (not null)
* @return A new {@link Label} validation status handler instance
*/
static ValidationStatusHandler label(Label statusLabel) {
return label(statusLabel, true);
}
/**
* Create a {@link ValidationStatusHandler} which uses a {@link Label} to notify validation errors.
* @param statusLabel The {@link Label} to use to notify validation errors (not null)
* @param hideWhenValid whether to hide the Label when the validation status is not invalid
* @return A new {@link Label} validation status handler instance
*/
static ValidationStatusHandler label(Label statusLabel, boolean hideWhenValid) {
return new LabelValidationStatusHandler(statusLabel, hideWhenValid);
}
/**
* Create a {@link ValidationStatusHandler} which shows a {@link Notification} of type
* {@link Notification#TYPE_ERROR_MESSAGE} to notify validation errors.
*
* This methods creates a notification validation status handler which displays only the first validation error.
*
* @return A new notification validation status handler instance
*/
static ValidationStatusHandler notification() {
return new NotificationValidationStatusHandler(null, false);
}
/**
* Create a {@link ValidationStatusHandler} which shows a {@link Notification} of type
* {@link Notification#TYPE_ERROR_MESSAGE} to notify validation errors.
* @param showAllErrors true to display all validation errors, false to show only the
* first
* @return A new notification validation status handler instance
*/
static ValidationStatusHandler notification(boolean showAllErrors) {
return new NotificationValidationStatusHandler(null, showAllErrors);
}
/**
* Create a {@link ValidationStatusHandler} which shows a {@link Notification} to notify validation errors.
*
* This methods creates a notification validation status handler which displays only the first validation error.
*
* @param notification The notification instance to use, null for default
* @return A new notification validation status handler instance
*/
static ValidationStatusHandler notification(Notification notification) {
return new NotificationValidationStatusHandler(notification, false);
}
/**
* Create a {@link ValidationStatusHandler} which shows a {@link Notification} to notify validation errors.
* @param notification The notification instance to use, null for default
* @param showAllErrors true to display all validation errors, false to show only the
* first
* @return A new notification validation status handler instance
*/
static ValidationStatusHandler notification(Notification notification, boolean showAllErrors) {
return new NotificationValidationStatusHandler(notification, showAllErrors);
}
/**
* Validation status.
*/
public enum Status {
/**
* Unresolved status, e.g. no value validation has been made yet.
*/
UNRESOLVED,
/**
* Validation passed.
*/
VALID,
/**
* Validation failed.
*/
INVALID;
}
/**
* A validation status event.
*
* @param Validation value type
*/
public interface ValidationStatusEvent extends Serializable {
/**
* Get the current validation status
* @return the validation status (never null)
*/
Status getStatus();
/**
* Gets whether the validation failed or not.
* @return true if validation failed (i.e. the validation status is {@link Status#INVALID}),
* false otherwise
*/
default boolean isInvalid() {
return getStatus() == Status.INVALID;
}
/**
* Get the {@link Localizable} validation error messages, if the validation status is {@link Status#INVALID}.
* @return the validation error messages when in invalid state, an empty list if none
*/
List getErrors();
/**
* Get the localized error messages from {@link #getErrors()}, using the context {@link LocalizationContext}, if
* available. If a {@link LocalizationContext} is not available, the default message of each localizable error
* message is returned.
* @return the localized error messages, an empty list if none.
*/
default List getErrorMessages() {
return getErrors().stream().map(e -> LocalizationContext.translate(e, true)).collect(Collectors.toList());
}
/**
* Get the first {@link Localizable} validation error message, if the validation status is
* {@link Status#INVALID}.
* @return the optional first {@link Localizable} validation error message when in invalid state
*/
default Optional getError() {
return Optional.ofNullable(getErrors().size() > 0 ? getErrors().get(0) : null);
}
/**
* Get the first localized error message, using the context {@link LocalizationContext}, if available. If a
* {@link LocalizationContext} is not available, the default message of the first localizable error message is
* returned.
* @return the first localized error message, or null if none
*/
default String getErrorMessage() {
return getError().map(e -> LocalizationContext.translate(e, true)).orElse(null);
}
/**
* If the validation event refers to a {@link Property} binding, returns the property to which the value
* component is bound.
* @return Optional {@link Property} to which the value component source of the validation event is bound, empty
* if no property binding is available
*/
Optional> getProperty();
/**
* Get the {@link ValueComponent} against whom the validation was performed.
* @return the source {@link ValueComponent}, empty if not available
*/
Optional> getSource();
}
}
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