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/*
* Copyright 2000-2022 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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