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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.hadoop.hive.ql.util;
import java.sql.Date;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.hive.common.type.HiveIntervalYearMonth;
import org.apache.hadoop.hive.common.type.HiveIntervalDayTime;
import org.apache.hadoop.hive.serde2.io.DateWritable;
import org.apache.hive.common.util.DateUtils;
public class DateTimeMath {
private static class NanosResult {
public int seconds;
public int nanos;
public void addNanos(int leftNanos, int rightNanos) {
seconds = 0;
nanos = leftNanos + rightNanos;
if (nanos < 0) {
seconds = -1;
nanos += DateUtils.NANOS_PER_SEC;
} else if (nanos >= DateUtils.NANOS_PER_SEC) {
seconds = 1;
nanos -= DateUtils.NANOS_PER_SEC;
}
}
}
protected Calendar calUtc = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
protected Calendar calLocal = Calendar.getInstance();
protected NanosResult nanosResult = new NanosResult();
//
// Operations involving/returning year-month intervals
//
/**
* Perform month arithmetic to millis value using UTC time zone.
* @param millis
* @param months
* @return
*/
public long addMonthsToMillisUtc(long millis, int months) {
calUtc.setTimeInMillis(millis);
calUtc.add(Calendar.MONTH, months);
return calUtc.getTimeInMillis();
}
/**
* Perform month arithmetic to millis value using local time zone.
* @param millis
* @param months
* @return
*/
public long addMonthsToMillisLocal(long millis, int months) {
calLocal.setTimeInMillis(millis);
calLocal.add(Calendar.MONTH, months);
return calLocal.getTimeInMillis();
}
public long addMonthsToNanosUtc(long nanos, int months) {
long result = addMonthsToMillisUtc(nanos / 1000000, months) * 1000000 + (nanos % 1000000);
return result;
}
public long addMonthsToNanosLocal(long nanos, int months) {
long result = addMonthsToMillisLocal(nanos / 1000000, months) * 1000000 + (nanos % 1000000);
return result;
}
public long addMonthsToDays(long days, int months) {
long millis = DateWritable.daysToMillis((int) days);
millis = addMonthsToMillisLocal(millis, months);
// Convert millis result back to days
return DateWritable.millisToDays(millis);
}
public Timestamp add(Timestamp ts, HiveIntervalYearMonth interval) {
if (ts == null || interval == null) {
return null;
}
// Attempt to match Oracle semantics for timestamp arithmetic,
// where timestamp arithmetic is done in UTC, then converted back to local timezone
long resultMillis = addMonthsToMillisUtc(ts.getTime(), interval.getTotalMonths());
Timestamp tsResult = new Timestamp(resultMillis);
tsResult.setNanos(ts.getNanos());
return tsResult;
}
public Date add(Date dt, HiveIntervalYearMonth interval) {
if (dt == null || interval == null) {
return null;
}
// Since Date millis value is in local timezone representation, do date arithmetic
// using local timezone so the time remains at the start of the day.
long resultMillis = addMonthsToMillisLocal(dt.getTime(), interval.getTotalMonths());
return new Date(resultMillis);
}
public HiveIntervalYearMonth add(HiveIntervalYearMonth left, HiveIntervalYearMonth right) {
HiveIntervalYearMonth result = null;
if (left == null || right == null) {
return null;
}
result = new HiveIntervalYearMonth(left.getTotalMonths() + right.getTotalMonths());
return result;
}
public Timestamp subtract(Timestamp left, HiveIntervalYearMonth right) {
if (left == null || right == null) {
return null;
}
return add(left, right.negate());
}
public Date subtract(Date left, HiveIntervalYearMonth right) {
if (left == null || right == null) {
return null;
}
return add(left, right.negate());
}
public HiveIntervalYearMonth subtract(HiveIntervalYearMonth left, HiveIntervalYearMonth right) {
if (left == null || right == null) {
return null;
}
return add(left, right.negate());
}
//
// Operations involving/returning day-time intervals
//
public Timestamp add(Timestamp ts, HiveIntervalDayTime interval) {
if (ts == null || interval == null) {
return null;
}
nanosResult.addNanos(ts.getNanos(), interval.getNanos());
long newMillis = ts.getTime()
+ TimeUnit.SECONDS.toMillis(interval.getTotalSeconds() + nanosResult.seconds);
Timestamp tsResult = new Timestamp(newMillis);
tsResult.setNanos(nanosResult.nanos);
return tsResult;
}
public HiveIntervalDayTime add(HiveIntervalDayTime left, HiveIntervalDayTime right) {
HiveIntervalDayTime result = null;
if (left == null || right == null) {
return null;
}
nanosResult.addNanos(left.getNanos(), right.getNanos());
long totalSeconds = left.getTotalSeconds() + right.getTotalSeconds() + nanosResult.seconds;
result = new HiveIntervalDayTime(totalSeconds, nanosResult.nanos);
return result;
}
public Timestamp subtract(Timestamp left, HiveIntervalDayTime right) {
if (left == null || right == null) {
return null;
}
return add(left, right.negate());
}
public HiveIntervalDayTime subtract(HiveIntervalDayTime left, HiveIntervalDayTime right) {
if (left == null || right == null) {
return null;
}
return add(left, right.negate());
}
public HiveIntervalDayTime subtract(Timestamp left, Timestamp right) {
HiveIntervalDayTime result = null;
if (left == null || right == null) {
return null;
}
nanosResult.addNanos(left.getNanos(), -(right.getNanos()));
long totalSeconds = TimeUnit.MILLISECONDS.toSeconds(left.getTime())
- TimeUnit.MILLISECONDS.toSeconds(right.getTime()) + nanosResult.seconds;
result = new HiveIntervalDayTime(totalSeconds, nanosResult.nanos);
return result;
}
}
