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The NetCDF-Java Library is a Java interface to NetCDF files,
as well as to many other types of scientific data formats.
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/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.nc2.units;
import java.util.Date;
import java.text.ParseException;
/**
* Implements a range of dates, using DateType and/or TimeDuration.
* You can use a DateType = "present" and a time duration to specify "real time" intervals, eg
* "last 3 days" uses endDate = "present" and duration = "3 days".
*
* @author john caron
*/
public class DateRange {
private DateType start, end;
private TimeDuration duration, resolution;
private boolean isEmpty, isMoving, useStart, useEnd, useDuration, useResolution;
/**
* default Constructor
*
* @throws java.text.ParseException artifact, cant happen
*/
public DateRange() throws ParseException {
this(null, new DateType(false, new Date()), new TimeDuration("1 day"), new TimeDuration("15 min"));
}
/**
* Create Date Range from a start and end date
*
* @param start start of range
* @param end end of range
*/
public DateRange(Date start, Date end) {
this(new DateType(false, start), new DateType(false, end), null, null);
}
/**
* Create Date Range from a start date and duration
*
* @param start start of range
* @param duration duration of range
*/
public DateRange(Date start, TimeDuration duration) {
this(new DateType(false, start), null, duration, null);
}
/**
* Create DateRange from another DateRange, with a different units of resolution.
*
* @param range copy start and end from here
* @param timeUnits make resolution using new TimeDuration( timeUnits)
* @throws Exception is units are not valid time units
*/
public DateRange(DateRange range, String timeUnits) throws Exception {
this(new DateType(false, range.getStart().getDate()), new DateType(false, range.getEnd().getDate()), null, new TimeDuration(timeUnits));
}
/**
* Encapsolates a range of dates, using DateType start/end, and/or a TimeDuration.
* A DateRange can be specified in any of the following ways:
*
* - a start date and end date
*
- a start date and duration
*
- an end date and duration
*
*
* @param start starting date
* @param end ending date
* @param duration time duration
* @param resolution time resolution; optional
*/
public DateRange(DateType start, DateType end, TimeDuration duration, TimeDuration resolution) {
this.start = start;
this.end = end;
this.duration = duration;
this.resolution = resolution;
useStart = (start != null) && !start.isBlank();
useEnd = (end != null) && !end.isBlank();
useDuration = (duration != null);
useResolution = (resolution != null);
boolean invalid = true;
if (useStart && useEnd) {
invalid = false;
this.isMoving = this.start.isPresent() || this.end.isPresent();
useDuration = false;
recalcDuration();
} else if (useStart && useDuration) {
invalid = false;
this.isMoving = this.start.isPresent();
this.end = this.start.add(duration);
} else if (useEnd && useDuration) {
invalid = false;
this.isMoving = this.end.isPresent();
this.start = this.end.subtract(duration);
}
if (invalid)
throw new IllegalArgumentException("DateRange must have 2 of start, end, duration");
checkIfEmpty();
hashCode = 0;
}
private void checkIfEmpty() {
if (this.start.isPresent() && this.end.isPresent())
isEmpty = true;
else if (this.start.isPresent() || this.end.isPresent())
isEmpty = duration.getValue() <= 0;
else
isEmpty = this.end.before(this.start);
if (isEmpty)
duration.setValueInSeconds(0);
}
// choose a resolution based on # seconds
private String chooseResolution(double time) {
if (time < 180) // 3 minutes
return "secs";
time /= 60; // minutes
if (time < 180) // 3 hours
return "minutes";
time /= 60; // hours
if (time < 72) // 3 days
return "hours";
time /= 24; // days
if (time < 90) // 3 months
return "days";
time /= 30; // months
if (time < 36) // 3 years
return "months";
return "years";
}
/**
* Determine if the given date is included in this date range.
* The date range includes the start and end dates.
*
* @param d date to check
* @return true if date in inside this range
*/
public boolean included(Date d) {
if (isEmpty) return false;
if (getStart().after(d)) return false;
if (getEnd().before(d)) return false;
return true;
}
/**
* Same as included()
* @param d date to check
* @return true if date in inside this range
*/
public boolean contains(Date d) {
return included(d);
}
/**
* Determine if the given range intersects this date range.
*
* @param start_want range starts here
* @param end_want range ends here
* @return true if ranges intersect
*/
public boolean intersects(Date start_want, Date end_want) {
if (isEmpty) return false;
if (getStart().after(end_want)) return false;
if (getEnd().before(start_want)) return false;
return true;
}
/**
* Determine if the given range intersects this date range.
*
* @param other date range
* @return true if ranges intersect
*/
public boolean intersects(DateRange other) {
return intersects(other.getStart().getDate(), other.getEnd().getDate());
}
/**
* Intersect with another date range
*
* @param clip intersect with this date range
* @return new date range that is the intersection
*/
public DateRange intersect(DateRange clip) {
if (isEmpty) return this;
if (clip.isEmpty) return clip;
DateType ss = getStart();
DateType s = ss.before(clip.getStart()) ? clip.getStart() : ss;
DateType ee = getEnd();
DateType e = ee.before(clip.getEnd()) ? ee : clip.getEnd();
return new DateRange(s, e, null, resolution);
}
/**
* Extend this date range by the given one.
*
* @param dr given DateRange
*/
public void extend(DateRange dr) {
boolean localEmpty = isEmpty;
if (localEmpty || dr.getStart().before(getStart()))
setStart(dr.getStart());
if (localEmpty || getEnd().before(dr.getEnd()))
setEnd(dr.getEnd());
}
/**
* Extend this date range by the given Date.
*
* @param d given Date
*/
public void extend(Date d) {
if (d.before(getStart().getDate()))
setStart( new DateType(false, d));
if (getEnd().before(d))
setEnd(new DateType(false, d));
}
/**
* Get the starting Date.
*
* @return starting Date
*/
public DateType getStart() {
return (isMoving && !useStart) ? this.end.subtract(duration) : start;
}
/**
* Set the starting Date. Makes useStart true.
* If useEnd, recalculate the duration, else recalculate end.
*
* @param start starting Date
*/
public void setStart(DateType start) {
this.start = start;
useStart = true;
if (useEnd) {
this.isMoving = this.start.isPresent() || this.end.isPresent();
useDuration = false;
recalcDuration();
} else {
this.isMoving = this.start.isPresent();
this.end = this.start.add(duration);
}
checkIfEmpty();
}
/**
* Get the ending Date.
*
* @return ending Date
*/
public DateType getEnd() {
return (isMoving && !useEnd) ? this.start.add(duration) : end;
}
/**
* Set the ending Date. Makes useEnd true.
* If useStart, recalculate the duration, else recalculate start.
*
* @param end ending Date
*/
public void setEnd(DateType end) {
this.end = end;
useEnd = true;
if (useStart) {
this.isMoving = this.start.isPresent() || this.end.isPresent();
useDuration = false;
recalcDuration();
} else {
this.isMoving = this.end.isPresent();
this.start = this.end.subtract(duration);
}
checkIfEmpty();
}
/**
* Get the duration of the interval
*
* @return duration of the interval
*/
public TimeDuration getDuration() {
if (isMoving && !useDuration)
recalcDuration();
return duration;
}
/**
* Set the duration of the interval. Makes useDuration true.
* If useStart, recalculate end, else recalculate start.
*
* @param duration duration of the interval
*/
public void setDuration(TimeDuration duration) {
this.duration = duration;
useDuration = true;
if (useStart) {
this.isMoving = this.start.isPresent();
this.end = this.start.add(duration);
useEnd = false;
} else {
this.isMoving = this.end.isPresent();
this.start = this.end.subtract(duration);
}
checkIfEmpty();
}
// assumes not moving
private void recalcDuration() {
long min = getStart().getDate().getTime();
long max = getEnd().getDate().getTime();
double secs = .001 * (max - min);
if (secs < 0)
secs = 0;
if (duration == null) {
try {
duration = new TimeDuration(chooseResolution(secs));
} catch (ParseException e) {
// cant happen
}
}
if (resolution == null) {
duration.setValueInSeconds(secs);
} else {
// make it a multiple of resolution
double resSecs = resolution.getValueInSeconds();
double closest = Math.round(secs / resSecs);
secs = closest * resSecs;
duration.setValueInSeconds(secs);
}
hashCode = 0;
}
/**
* Get the time resolution.
*
* @return time resolution as a duration
*/
public TimeDuration getResolution() {
return resolution;
}
/**
* Set the time resolution.
*
* @param resolution the time resolution
*/
public void setResolution(TimeDuration resolution) {
this.resolution = resolution;
useResolution = true;
}
/**
* Get if the start is fixed.
* @return if start is fixed
*/
public boolean useStart() {
return useStart;
}
/**
* Get if the end is fixed.
* @return if end is fixed
*/
public boolean useEnd() {
return useEnd;
}
/**
* Get if the duration is fixed.
* @return if duration is fixed
*/
public boolean useDuration() {
return useDuration;
}
/**
* Get if the resolution is set.
* @return if resolution is fixed
*/
public boolean useResolution() {
return useResolution;
}
/**
* Return true if start date equals end date, so date range is a point.
*
* @return true if start = end
*/
public boolean isPoint() {
return !isEmpty && start.equals(end);
}
/**
* If the range is empty
*
* @return if the range is empty
*/
public boolean isEmpty() {
return isEmpty;
}
@Override
public String toString() {
return "start= " + start + " end= " + end + " duration= " + duration
+ " resolution= " + resolution;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof DateRange)) return false;
DateRange oo = (DateRange) o;
if (useStart && !start.equals(oo.start)) return false;
if (useEnd && !end.equals(oo.end)) return false;
if (useDuration && !duration.equals(oo.duration)) return false;
if (useResolution && !resolution.equals(oo.resolution)) return false;
return true;
}
/**
* Override Object.hashCode() to implement equals.
*/
@Override
public int hashCode() {
if (hashCode == 0) {
int result = 17;
if (useStart)
result = 37 * result + start.hashCode();
if (useEnd)
result = 37 * result + end.hashCode();
if (useDuration)
result = 37 * result + duration.hashCode();
if (useResolution)
result = 37 * result + resolution.hashCode();
hashCode = result;
}
return hashCode;
}
private int hashCode = 0; // Bloch, item 8
}