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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.DateFormat;
import java.text.ParsePosition;
import java.util.Date;
import java.util.Locale;
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
/**
* A converter that converts from {@link Date} to {@link String} and back. Uses
* the given locale and {@link DateFormat} for formatting and parsing.
* <p>
* Leading and trailing white spaces are ignored when converting from a String.
* </p>
* <p>
* Override and overwrite {@link #getFormat(Locale)} to use a different format.
* </p>
*
* @author Vaadin Ltd
* @since 8.0
*/
public class StringToDateConverter implements Converter<String, Date> {
/**
* Returns the format used by {@link #convertToPresentation(Date, ValueContext)}
* and {@link #convertToModel(String, ValueContext)}.
*
* @param locale
* The locale to use
* @return A DateFormat instance
*/
protected DateFormat getFormat(Locale locale) {
if (locale == null) {
locale = Locale.getDefault();
}
DateFormat format = DateFormat.getDateTimeInstance(DateFormat.MEDIUM,
DateFormat.MEDIUM, locale);
format.setLenient(false);
return format;
}
@Override
public Result<Date> convertToModel(String value, ValueContext context) {
if (value == null) {
return Result.ok(null);
}
// Remove leading and trailing white space
value = value.trim();
ParsePosition parsePosition = new ParsePosition(0);
Date parsedValue = getFormat(context.getLocale().orElse(null))
.parse(value, parsePosition);
if (parsePosition.getIndex() != value.length()) {
return Result.error("Could not convert '" + value);
}
return Result.ok(parsedValue);
}
@Override
public String convertToPresentation(Date value, ValueContext context) {
if (value == null) {
return null;
}
return getFormat(context.getLocale().orElse(null)).format(value);
}
}
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