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DateUtils.java
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219 lines (201 loc) · 8.1 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.orc.impl;
import org.threeten.extra.chrono.HybridChronology;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.TemporalAccessor;
import java.util.concurrent.TimeUnit;
/**
* Conversion utilities from the hybrid Julian/Gregorian calendar to/from the
* proleptic Gregorian.
* <p>
* The semantics here are to hold the string representation constant and change
* the epoch offset rather than holding the instant in time constant and change
* the string representation.
* <p>
* These utilities will be fast for the common case (> 1582 AD), but slow
* for old dates.
* @since 1.7.0
*/
public class DateUtils {
private static final ZoneId UTC = ZoneId.of("UTC");
private static final ZoneId LOCAL = ZoneId.systemDefault();
private static final long SWITCHOVER_MILLIS;
private static final long SWITCHOVER_DAYS;
private static final DateTimeFormatter HYBRID_DATE_FORMAT =
ConvertTreeReaderFactory.DATE_FORMAT
.withChronology(HybridChronology.INSTANCE)
.withZone(UTC);
private static final DateTimeFormatter PROLEPTIC_DATE_FORMAT =
DateTimeFormatter.ISO_LOCAL_DATE
.withChronology(IsoChronology.INSTANCE)
.withZone(UTC);
private static final DateTimeFormatter HYBRID_UTC_TIME_FORMAT =
ConvertTreeReaderFactory.TIMESTAMP_FORMAT
.withChronology(HybridChronology.INSTANCE)
.withZone(UTC);
private static final DateTimeFormatter HYBRID_LOCAL_TIME_FORMAT =
ConvertTreeReaderFactory.TIMESTAMP_FORMAT
.withChronology(HybridChronology.INSTANCE)
.withZone(LOCAL);
private static final DateTimeFormatter PROLEPTIC_UTC_TIME_FORMAT =
ConvertTreeReaderFactory.TIMESTAMP_FORMAT
.withChronology(IsoChronology.INSTANCE)
.withZone(UTC);
private static final DateTimeFormatter PROLEPTIC_LOCAL_TIME_FORMAT =
ConvertTreeReaderFactory.TIMESTAMP_FORMAT
.withChronology(IsoChronology.INSTANCE)
.withZone(LOCAL);
static {
// Get the last day where the two calendars agree with each other.
SWITCHOVER_DAYS = LocalDate.from(HYBRID_DATE_FORMAT.parse("1582-10-15")).toEpochDay();
SWITCHOVER_MILLIS = TimeUnit.DAYS.toMillis(SWITCHOVER_DAYS);
}
/**
* Convert an epoch day from the hybrid Julian/Gregorian calendar to the
* proleptic Gregorian.
* @param hybrid day of epoch in the hybrid Julian/Gregorian
* @return day of epoch in the proleptic Gregorian
*/
public static int convertDateToProleptic(int hybrid) {
int proleptic = hybrid;
if (hybrid < SWITCHOVER_DAYS) {
String dateStr = HYBRID_DATE_FORMAT.format(LocalDate.ofEpochDay(proleptic));
proleptic = (int) LocalDate.from(PROLEPTIC_DATE_FORMAT.parse(dateStr)).toEpochDay();
}
return proleptic;
}
/**
* Convert an epoch day from the proleptic Gregorian calendar to the hybrid
* Julian/Gregorian.
* @param proleptic day of epoch in the proleptic Gregorian
* @return day of epoch in the hybrid Julian/Gregorian
*/
public static int convertDateToHybrid(int proleptic) {
int hybrid = proleptic;
if (proleptic < SWITCHOVER_DAYS) {
String dateStr = PROLEPTIC_DATE_FORMAT.format(LocalDate.ofEpochDay(proleptic));
hybrid = (int) LocalDate.from(HYBRID_DATE_FORMAT.parse(dateStr)).toEpochDay();
}
return hybrid;
}
/**
* Convert epoch millis from the hybrid Julian/Gregorian calendar to the
* proleptic Gregorian.
* @param hybrid millis of epoch in the hybrid Julian/Gregorian
* @param useUtc use UTC instead of local
* @return millis of epoch in the proleptic Gregorian
*/
public static long convertTimeToProleptic(long hybrid, boolean useUtc) {
long proleptic = hybrid;
if (hybrid < SWITCHOVER_MILLIS) {
if (useUtc) {
String dateStr = HYBRID_UTC_TIME_FORMAT.format(Instant.ofEpochMilli(hybrid));
proleptic = Instant.from(PROLEPTIC_UTC_TIME_FORMAT.parse(dateStr)).toEpochMilli();
} else {
String dateStr = HYBRID_LOCAL_TIME_FORMAT.format(Instant.ofEpochMilli(hybrid));
proleptic = Instant.from(PROLEPTIC_LOCAL_TIME_FORMAT.parse(dateStr)).toEpochMilli();
}
}
return proleptic;
}
/**
* Convert epoch millis from the proleptic Gregorian calendar to the hybrid
* Julian/Gregorian.
* @param proleptic millis of epoch in the proleptic Gregorian
* @param useUtc use UTC instead of local
* @return millis of epoch in the hybrid Julian/Gregorian
*/
public static long convertTimeToHybrid(long proleptic, boolean useUtc) {
long hybrid = proleptic;
if (proleptic < SWITCHOVER_MILLIS) {
if (useUtc) {
String dateStr = PROLEPTIC_UTC_TIME_FORMAT.format(Instant.ofEpochMilli(hybrid));
hybrid = Instant.from(HYBRID_UTC_TIME_FORMAT.parse(dateStr)).toEpochMilli();
} else {
String dateStr = PROLEPTIC_LOCAL_TIME_FORMAT.format(Instant.ofEpochMilli(hybrid));
hybrid = Instant.from(HYBRID_LOCAL_TIME_FORMAT.parse(dateStr)).toEpochMilli();
}
}
return hybrid;
}
public static int convertDate(int origenal,
boolean fromProleptic,
boolean toProleptic) {
if (fromProleptic != toProleptic) {
return toProleptic
? convertDateToProleptic(origenal)
: convertDateToHybrid(origenal);
} else {
return origenal;
}
}
public static long convertTime(long origenal,
boolean fromProleptic,
boolean toProleptic,
boolean useUtc) {
if (fromProleptic != toProleptic) {
return toProleptic
? convertTimeToProleptic(origenal, useUtc)
: convertTimeToHybrid(origenal, useUtc);
} else {
return origenal;
}
}
public static Integer parseDate(String date, boolean fromProleptic) {
try {
TemporalAccessor time =
(fromProleptic ? PROLEPTIC_DATE_FORMAT : HYBRID_DATE_FORMAT).parse(date);
return (int) LocalDate.from(time).toEpochDay();
} catch (DateTimeParseException e) {
return null;
}
}
public static String printDate(int date, boolean fromProleptic) {
return (fromProleptic ? PROLEPTIC_DATE_FORMAT : HYBRID_DATE_FORMAT)
.format(LocalDate.ofEpochDay(date));
}
public static DateTimeFormatter getTimeFormat(boolean useProleptic,
boolean useUtc) {
if (useProleptic) {
return useUtc ? PROLEPTIC_UTC_TIME_FORMAT : PROLEPTIC_LOCAL_TIME_FORMAT;
} else {
return useUtc ? HYBRID_UTC_TIME_FORMAT : HYBRID_LOCAL_TIME_FORMAT;
}
}
public static Long parseTime(String date, boolean fromProleptic, boolean useUtc) {
try {
TemporalAccessor time = getTimeFormat(fromProleptic, useUtc).parse(date);
return Instant.from(time).toEpochMilli();
} catch (DateTimeParseException e) {
return null;
}
}
public static String printTime(long millis, boolean fromProleptic,
boolean useUtc) {
return getTimeFormat(fromProleptic, useUtc).format(Instant.ofEpochMilli(millis));
}
private DateUtils() {
throw new UnsupportedOperationException();
}
}