spring PeriodToStringConverter 源码
springboot PeriodToStringConverter 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java
/*
* Copyright 2002-2020 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.Period;
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;
import org.springframework.util.ObjectUtils;
/**
* {@link Converter} to convert from a {@link Period} to a {@link String}.
*
* @author Eddú Meléndez
* @author Edson Chávez
* @see PeriodFormat
* @see PeriodUnit
*/
final class PeriodToStringConverter implements GenericConverter {
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(Period.class, String.class));
}
@Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (ObjectUtils.isEmpty(source)) {
return null;
}
return convert((Period) source, getPeriodStyle(sourceType), getPeriodUnit(sourceType));
}
private PeriodStyle getPeriodStyle(TypeDescriptor sourceType) {
PeriodFormat annotation = sourceType.getAnnotation(PeriodFormat.class);
return (annotation != null) ? annotation.value() : null;
}
private String convert(Period source, PeriodStyle style, ChronoUnit unit) {
style = (style != null) ? style : PeriodStyle.ISO8601;
return style.print(source, unit);
}
private ChronoUnit getPeriodUnit(TypeDescriptor sourceType) {
PeriodUnit annotation = sourceType.getAnnotation(PeriodUnit.class);
return (annotation != null) ? annotation.value() : null;
}
}
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- 本文标签： Spring Boot Java Spring
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