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package com.vaadin.data.validator;
import java.util.Objects;
import com.vaadin.data.Binder.BindingBuilder;
import com.vaadin.data.HasValue;
import com.vaadin.data.ValidationResult;
import com.vaadin.data.Validator;
import com.vaadin.data.ValueContext;
/**
* Simple validator to check against {@code null} value and empty {@link String}
* value.
* <p>
* This validator can be suitable for fields that have been marked as required
* with {@link HasValue#setRequiredIndicatorVisible(boolean)}.
* <p>
* Note that
* {@link BindingBuilder#asRequired(com.vaadin.data.ErrorMessageProvider)} does
* almost the same thing, but verifies against the value NOT being equal to what
* {@link HasValue#getEmptyValue()} returns and sets the required indicator
* visible with {@link HasValue#setRequiredIndicatorVisible(boolean)}.
*
* @see HasValue#setRequiredIndicatorVisible(boolean)
* @see BindingBuilder#asRequired(com.vaadin.data.ErrorMessageProvider)
* @author Vaadin Ltd
* @since 8.0
*
*/
public class NotEmptyValidator<T> implements Validator<T> {
private final String message;
/**
* @param message
* error validation message
*/
public NotEmptyValidator(String message) {
this.message = message;
}
@Override
public ValidationResult apply(T value, ValueContext context) {
if (Objects.isNull(value) || Objects.equals(value, "")) {
return ValidationResult.error(message);
} else {
return ValidationResult.ok();
}
}
}
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