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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.ui.declarative.converters;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.Locale;
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
import com.vaadin.ui.declarative.DesignAttributeHandler;
/**
* A {@link LocalDate} converter to be used by {@link DesignAttributeHandler}.
* Provides ISO-compliant way of storing date and time.
*
* @since 8.0
* @author Vaadin Ltd
*/
public class DesignLocalDateConverter implements Converter<String, LocalDate> {
@Override
public Result<LocalDate> convertToModel(String value,
ValueContext context) {
for (String pattern : new String[] { "yyyy-MM-dd", "yyyy-MM",
"yyyy" }) {
try {
Locale effectiveLocale = context.getLocale()
.orElse(Locale.ENGLISH);
LocalDate date = DateTimeFormatter
.ofPattern(pattern, effectiveLocale)
.parse(value, LocalDate::from);
return Result.ok(date);
} catch (DateTimeParseException e) {
// not parseable, ignore and try another format
}
}
return Result.error("Could not parse date value: " + value);
}
@Override
public String convertToPresentation(LocalDate value, ValueContext context) {
return DateTimeFormatter
.ofPattern("yyyy-MM-dd",
context.getLocale().orElse(Locale.ENGLISH))
.format(value);
}
}
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