org.springframework.boot.convert.DurationToStringConverter Maven / Gradle / Ivy
/*
* Copyright 2012-2018 the original author or authors.
*
* 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
*
* https://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 org.springframework.boot.convert;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.Collections;
import java.util.Set;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.GenericConverter;
/**
* {@link Converter} to convert from a {@link Duration} to a {@link String}.
*
* @author Phillip Webb
* @see DurationFormat
* @see DurationUnit
*/
final class DurationToStringConverter implements GenericConverter {
@Override
public Set getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(Duration.class, String.class));
}
@Override
public Object convert(Object source, TypeDescriptor sourceType,
TypeDescriptor targetType) {
if (source == null) {
return null;
}
return convert((Duration) source, getDurationStyle(sourceType),
getDurationUnit(sourceType));
}
private ChronoUnit getDurationUnit(TypeDescriptor sourceType) {
DurationUnit annotation = sourceType.getAnnotation(DurationUnit.class);
return (annotation != null) ? annotation.value() : null;
}
private DurationStyle getDurationStyle(TypeDescriptor sourceType) {
DurationFormat annotation = sourceType.getAnnotation(DurationFormat.class);
return (annotation != null) ? annotation.value() : null;
}
private String convert(Duration source, DurationStyle style, ChronoUnit unit) {
style = (style != null) ? style : DurationStyle.ISO8601;
return style.print(source, unit);
}
}