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- /*
- * Copyright 2000-2018 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.converter;
-
- import java.text.NumberFormat;
- import java.util.Locale;
-
- import com.vaadin.data.ErrorMessageProvider;
- import com.vaadin.data.Result;
- import com.vaadin.data.ValueContext;
-
- /**
- * A converter that converts from {@link String} to {@link Long} and back. Uses
- * the given locale and a {@link NumberFormat} instance for formatting and
- * parsing.
- * <p>
- * Override and overwrite {@link #getFormat(Locale)} to use a different format.
- * </p>
- *
- * @author Vaadin Ltd
- * @since 8.0
- */
- public class StringToLongConverter
- extends AbstractStringToNumberConverter<Long> {
-
- /**
- * Creates a new converter instance with the given error message. Empty
- * strings are converted to <code>null</code>.
- *
- * @param errorMessage
- * the error message to use if conversion fails
- */
- public StringToLongConverter(String errorMessage) {
- this(null, errorMessage);
- }
-
- /**
- * Creates a new converter instance with the given empty string value and
- * error message.
- *
- * @param emptyValue
- * the presentation value to return when converting an empty
- * string, may be <code>null</code>
- * @param errorMessage
- * the error message to use if conversion fails
- */
- public StringToLongConverter(Long emptyValue, String errorMessage) {
- super(emptyValue, errorMessage);
- }
-
- /**
- * Creates a new converter instance with the given error message provider.
- * Empty strings are converted to <code>null</code>.
- *
- * @param errorMessageProvider
- * the error message provider to use if conversion fails
- *
- * @since 8.4
- */
- public StringToLongConverter(ErrorMessageProvider errorMessageProvider) {
- this(null, errorMessageProvider);
- }
-
- /**
- * Creates a new converter instance with the given empty string value and
- * error message provider.
- *
- * @param emptyValue
- * the presentation value to return when converting an empty
- * string, may be <code>null</code>
- * @param errorMessageProvider
- * the error message provider to use if conversion fails
- *
- * @since 8.4
- */
- public StringToLongConverter(Long emptyValue,
- ErrorMessageProvider errorMessageProvider) {
- super(emptyValue, errorMessageProvider);
- }
-
- /**
- * Returns the format used by
- * {@link #convertToPresentation(Object, ValueContext)} and
- * {@link #convertToModel(String, ValueContext)}.
- *
- * @param locale
- * The locale to use
- * @return A NumberFormat instance
- */
- @Override
- protected NumberFormat getFormat(Locale locale) {
- if (locale == null) {
- locale = Locale.getDefault();
- }
- return NumberFormat.getIntegerInstance(locale);
- }
-
- @Override
- public Result<Long> convertToModel(String value, ValueContext context) {
- Result<Number> n = convertToNumber(value, context);
- return n.map(number -> {
- if (number == null) {
- return null;
- }
- return number.longValue();
- });
- }
-
- }
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