spring DateTimeContextHolder 源码
spring DateTimeContextHolder 代码
文件路径：/spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeContextHolder.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.standard;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import org.springframework.core.NamedThreadLocal;
import org.springframework.lang.Nullable;
/**
* A holder for a thread-local user {@link DateTimeContext}.
*
* @author Juergen Hoeller
* @since 4.0
* @see org.springframework.context.i18n.LocaleContextHolder
*/
public final class DateTimeContextHolder {
private static final ThreadLocal<DateTimeContext> dateTimeContextHolder =
new NamedThreadLocal<>("DateTimeContext");
private DateTimeContextHolder() {
}
/**
* Reset the DateTimeContext for the current thread.
*/
public static void resetDateTimeContext() {
dateTimeContextHolder.remove();
}
/**
* Associate the given DateTimeContext with the current thread.
* @param dateTimeContext the current DateTimeContext,
* or {@code null} to reset the thread-bound context
*/
public static void setDateTimeContext(@Nullable DateTimeContext dateTimeContext) {
if (dateTimeContext == null) {
resetDateTimeContext();
}
else {
dateTimeContextHolder.set(dateTimeContext);
}
}
/**
* Return the DateTimeContext associated with the current thread, if any.
* @return the current DateTimeContext, or {@code null} if none
*/
@Nullable
public static DateTimeContext getDateTimeContext() {
return dateTimeContextHolder.get();
}
/**
* Obtain a DateTimeFormatter with user-specific settings applied to the given base formatter.
* @param formatter the base formatter that establishes default formatting rules
* (generally user independent)
* @param locale the current user locale (may be {@code null} if not known)
* @return the user-specific DateTimeFormatter
*/
public static DateTimeFormatter getFormatter(DateTimeFormatter formatter, @Nullable Locale locale) {
DateTimeFormatter formatterToUse = (locale != null ? formatter.withLocale(locale) : formatter);
DateTimeContext context = getDateTimeContext();
return (context != null ? context.getFormatter(formatterToUse) : formatterToUse);
}
}
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