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- /*
- * Copyright 2000-2016 Vaadin Ltd.
- *
- * 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.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.util.converter.ValueContext;
-
- /**
- * Simple validator to check against {@code null} value and empty {@link String}
- * value.
- * <p>
- * This validator works similar to {@link NotNullValidator} but in addition it
- * also check whether the value is not an empty String.
- * <p>
- * This validator can be suitable for fields that have been marked as required
- * with {@link HasValue#setRequiredIndicatorVisible(boolean)}.
- * <p>
- * Note that {@link BindingBuilder#setRequired(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#setRequired(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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