spring DateTimeFormatAnnotationFormatterFactory 源码
spring DateTimeFormatAnnotationFormatterFactory 代码
文件路径：/spring-context/src/main/java/org/springframework/format/datetime/DateTimeFormatAnnotationFormatterFactory.java
/*
* Copyright 2002-2021 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.format.datetime;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Set;
import org.springframework.context.support.EmbeddedValueResolutionSupport;
import org.springframework.format.AnnotationFormatterFactory;
import org.springframework.format.Formatter;
import org.springframework.format.Parser;
import org.springframework.format.Printer;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.util.StringUtils;
/**
* Formats fields annotated with the {@link DateTimeFormat} annotation using a {@link DateFormatter}.
*
* @author Phillip Webb
* @author Sam Brannen
* @since 3.2
*/
public class DateTimeFormatAnnotationFormatterFactory extends EmbeddedValueResolutionSupport
implements AnnotationFormatterFactory<DateTimeFormat> {
private static final Set<Class<?>> FIELD_TYPES = Set.of(Date.class, Calendar.class, Long.class);
@Override
public Set<Class<?>> getFieldTypes() {
return FIELD_TYPES;
}
@Override
public Printer<?> getPrinter(DateTimeFormat annotation, Class<?> fieldType) {
return getFormatter(annotation, fieldType);
}
@Override
public Parser<?> getParser(DateTimeFormat annotation, Class<?> fieldType) {
return getFormatter(annotation, fieldType);
}
protected Formatter<Date> getFormatter(DateTimeFormat annotation, Class<?> fieldType) {
DateFormatter formatter = new DateFormatter();
formatter.setSource(annotation);
formatter.setIso(annotation.iso());
String style = resolveEmbeddedValue(annotation.style());
if (StringUtils.hasLength(style)) {
formatter.setStylePattern(style);
}
String pattern = resolveEmbeddedValue(annotation.pattern());
if (StringUtils.hasLength(pattern)) {
formatter.setPattern(pattern);
}
List<String> resolvedFallbackPatterns = new ArrayList<>();
for (String fallbackPattern : annotation.fallbackPatterns()) {
String resolvedFallbackPattern = resolveEmbeddedValue(fallbackPattern);
if (StringUtils.hasLength(resolvedFallbackPattern)) {
resolvedFallbackPatterns.add(resolvedFallbackPattern);
}
}
if (!resolvedFallbackPatterns.isEmpty()) {
formatter.setFallbackPatterns(resolvedFallbackPatterns.toArray(new String[0]));
}
return formatter;
}
}
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