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// Copyright 2015 Google Inc. All rights reserved.
//
// 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
//
// 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 com.google.devtools.build.android.ziputils;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
* This class supports conversion from a {@code java.util.Date} object, to a
* 4 bytes DOS date and time representation.
*/
public final class DosTime {
/** DOS representation of DOS epoch (midnight, jan 1, 1980) */
public static final DosTime EPOCH;
/** {@code java.util.Date} for DOS epoch */
public static final Date DOS_EPOCH;
private static final Calendar calendar;
/**
* DOS representation of date passed to constructor.
* Time is lower the 16 bit, date the upper 16 bit.
*/
public final int time;
/**
* Creates a DOS representation of the given date.
* @param date date to represent in DOS format.
*/
public DosTime(Date date) {
this.time = dateToDosTime(date);
}
static {
calendar = new GregorianCalendar(1980, 0, 1, 0, 0, 0);
DOS_EPOCH = calendar.getTime();
EPOCH = new DosTime(DOS_EPOCH);
}
private static synchronized int dateToDosTime(Date date) {
calendar.setTime(date);
int year = calendar.get(Calendar.YEAR);
if (year < 1980) {
throw new IllegalArgumentException("date must be in or after 1980");
}
if (year > 2107) {
throw new IllegalArgumentException("date must be before 2107");
}
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
return ((year - 1980) << 25) | (month << 21) | (day << 16)
| (hour << 11) | (minute << 5) | (second >> 1);
}
}
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