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// Copyright (C) 2006 Google Inc.
//
// 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.ical.util;
import com.google.ical.values.DateTimeValue;
import com.google.ical.values.DateTimeValueImpl;
import com.google.ical.values.DateValue;
import com.google.ical.values.DateValueImpl;
import com.google.ical.util.TimeUtils;
import com.google.ical.values.TimeValue;
/**
* a mutable buffer that can be used to build {@link DateValue}s and
* {@link DateTimeValue}s.
*
* @author [email protected] (Mike Samuel)
*/
public class DTBuilder {
/** in AD. 0 -> 1BC. */
public int year;
/** one indexed. */
public int month;
/** one indexed */
public int day;
/** zero indexed in 24 hour time. */
public int hour;
/** zero indexed */
public int minute;
/** zero indexed */
public int second;
public DTBuilder(int year, int month, int day,
int hour, int minute, int second) {
this.year = year;
this.month = month;
this.day = day;
this.hour = hour;
this.minute = minute;
this.second = second;
}
public DTBuilder(int year, int month, int day) {
this.year = year;
this.month = month;
this.day = day;
}
public DTBuilder(DateValue dv) {
this.year = dv.year();
this.month = dv.month();
this.day = dv.day();
if (dv instanceof TimeValue) {
TimeValue tv = (TimeValue) dv;
this.hour = tv.hour();
this.minute = tv.minute();
this.second = tv.second();
}
}
/**
* produces a normalized date time, using zero for the time fields if none
* were provided.
* @return not null
*/
public DateTimeValue toDateTime() {
normalize();
return new DateTimeValueImpl(year, month, day, hour, minute, second);
}
/**
* produces a normalized date.
* @return not null
*/
public DateValue toDate() {
normalize();
return new DateValueImpl(year, month, day);
}
/**
* behavior undefined unless normalized.
* If you're not sure whether it's appropriate to use this method, use
* toDateValue().compareTo(dv) instead.
*/
public int compareTo(DateValue dv) {
long dvComparable =
(((((long) dv.year()) << 4) + dv.month()) << 5) + dv.day();
long dtbComparable =
((((long) year << 4) + month << 5)) + day;
if (dv instanceof TimeValue) {
TimeValue tv = (TimeValue) dv;
dvComparable = (((((dvComparable << 5) + tv.hour()) << 6) + tv.minute())
<< 6) + tv.second();
dtbComparable = (((((dtbComparable << 5) + hour) << 6) + minute)
<< 6) + second;
}
long delta = dtbComparable - dvComparable;
return delta < 0 ? -1 : delta == 0 ? 0 : 1;
}
/**
* makes sure that the fields are in the proper ranges, by e.g. converting
* 32 January to 1 February, or month 0 to December of the year before.
*/
public void normalize() {
this.normalizeTime();
this.normalizeDate();
}
@Override
public String toString() {
return year + "-" + month + "-" + day + " " + hour + ":" + minute + ":"
+ second;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof DTBuilder)) { return false; }
DTBuilder that = (DTBuilder) o;
return this.year == that.year
&& this.month == that.month
&& this.day == that.day
&& this.hour == that.hour
&& this.minute == that.minute
&& this.second == that.second;
}
@Override
public int hashCode() {
return
((((((((year << 4) + month << 5) + day) << 5) + hour) << 6) + minute)
<< 6) + second;
}
private void normalizeTime() {
int addMinutes = ((second < 0) ? (second - 59) : second) / 60;
second -= addMinutes * 60;
minute += addMinutes;
int addHours = ((minute < 0) ? (minute - 59) : minute) / 60;
minute -= addHours * 60;
hour += addHours;
int addDays = ((hour < 0) ? (hour - 23) : hour) / 24;
hour -= addDays * 24;
day += addDays;
}
private void normalizeDate() {
while (day <= 0) {
int days = TimeUtils.yearLength(month > 2 ? year : year - 1);
day += days;
--year;
}
if (month <= 0) {
int years = month / 12 - 1;
year += years;
month -= 12 * years;
} else if (month > 12) {
int years = (month - 1) / 12;
year += years;
month -= 12 * years;
}
while (true) {
if (month == 1) {
int yearLength = TimeUtils.yearLength(year);
if (day > yearLength) {
++year;
day -= yearLength;
}
}
int monthLength = TimeUtils.monthLength(year, month);
if (day > monthLength) {
day -= monthLength;
if (++month > 12) {
month -= 12;
++year;
}
} else {
break;
}
}
}
}