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// $Id: TimeScaleUnit.java 64 2006-07-12 22:30:50Z edavis $
/*
* 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.units;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* Provides support for a reference time unit whose origin is at a certain time.
*
* Instances of this class are immutable.
*
* @author Steven R. Emmerson
* @version $Id: TimeScaleUnit.java 64 2006-07-12 22:30:50Z edavis $
*/
public final class TimeScaleUnit extends UnitImpl {
private static final long serialVersionUID = 1L;
/**
* The reference time unit.
*
* @serial
*/
private final Unit _unit;
/**
* The time origin for this instance.
*
* @serial
*/
private final Date _origin;
/**
* The date formatter.
*
* @serial
*/
private static final SimpleDateFormat dateFormat;
/**
* The second unit.
*/
private static final BaseUnit SECOND;
static {
dateFormat = (SimpleDateFormat) DateFormat.getDateInstance(
DateFormat.SHORT, Locale.US);
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
dateFormat.applyPattern(" 'since' yyyy-MM-dd HH:mm:ss.SSS 'UTC'");
try {
SECOND = BaseUnit.getOrCreate(UnitName.newUnitName("second", null,
"s"), BaseQuantity.TIME);
}
catch (final Exception e) {
throw (ExceptionInInitializerError) new ExceptionInInitializerError()
.initCause(e);
}
}
/**
* Constructs from a reference unit and a time origin.
*
* @param unit
* The reference time unit.
* @param origin
* The time origin.
* @throws BadUnitException
* unit is not a unit of time.
*/
public TimeScaleUnit(final Unit unit, final Date origin)
throws BadUnitException, UnitSystemException {
this(unit, origin, null);
}
/**
* Constructs from a reference unit, a time origin, and an identifier.
*
* @param unit
* The reference time unit.
* @param origin
* The time origin.
* @param id
* The identifier.
* @throws BadUnitException
* unit is not a unit of time.
*/
public TimeScaleUnit(final Unit unit, final Date origin, final UnitName id)
throws BadUnitException, UnitSystemException {
super(id);
if (!unit.isCompatible(UnitSystemManager.instance().getBaseUnit(
BaseQuantity.TIME))) {
throw new BadUnitException("\"" + unit + "\" is not a unit of time");
}
_unit = unit;
_origin = origin;
}
static Unit getInstance(final Unit unit, final Date origin)
throws ShiftException {
try {
return unit instanceof TimeScaleUnit
? new TimeScaleUnit(((TimeScaleUnit) unit)._unit, origin)
: new TimeScaleUnit(unit, origin);
}
catch (final Exception e) {
throw (ShiftException) new ShiftException(unit, origin)
.initCause(e);
}
}
/**
* Returns the reference unit.
*
* @return The reference unit.
*/
public Unit getUnit() {
return _unit;
}
/**
* Returns the time origin.
*
* @return The time origin.
*/
public Date getOrigin() {
return _origin;
}
/*
* From UnitImpl:
*/
/**
* Clones this unit, changing the identifier.
*
* @param id
* The new identifier.
* @return This unit with the new identifier.
*/
public Unit clone(final UnitName id) {
Unit clone;
try {
clone = new TimeScaleUnit(getUnit(), getOrigin(), id);
}
catch (final UnitException e) {
clone = null; // can't happen
}
return clone;
}
@Override
public Unit shiftTo(final double origin) throws ShiftException {
Date newOrigin;
try {
newOrigin = new Date(_origin.getTime()
+ (long) (_unit.convertTo(origin, SECOND) * 1000));
}
catch (final ConversionException e) {
throw (ShiftException) new ShiftException(this, origin)
.initCause(e);
}
try {
return new TimeScaleUnit(_unit, newOrigin);
}
catch (final BadUnitException e) {
throw new AssertionError();
}
catch (final UnitSystemException e) {
throw (ShiftException) new ShiftException(this, origin)
.initCause(e);
}
}
@Override
public Unit shiftTo(final Date origin) throws ShiftException {
return getInstance(_unit, origin);
}
/**
* Multiplies this unit by another unit. This operation is invalid.
*
* @param that
* The other unit.
* @return The product of multiplying this unit by the other unit.
* @throws MultiplyException
* Illegal operation. Always thrown.
*/
@Override
protected Unit myMultiplyBy(final Unit that) throws MultiplyException {
throw new MultiplyException(this);
}
/**
* Divides this unit by another unit. This operation is invalid.
*
* @param that
* The other unit.
* @return The quotient of dividing this unit by the other unit.
* @throws DivideException
* Illegal operation. Always thrown.
*/
@Override
protected Unit myDivideBy(final Unit that) throws DivideException {
throw new DivideException(this);
}
/**
* Divides this unit into another unit. This operation is invalid.
*
* @param that
* The other unit.
* @return The quotient of dividing this unit into the other unit.
* @throws DivideException
* Illegal operation. Always thrown.
*/
@Override
protected Unit myDivideInto(final Unit that) throws DivideException {
throw new DivideException(that, this);
}
/**
* Raises this unit to a power. This operation is invalid.
*
* @param power
* The power.
* @return The result of raising this unit to the power.
* @throws RaiseException
* Illegal operation. Always thrown.
*/
@Override
protected Unit myRaiseTo(final int power) throws RaiseException {
throw new RaiseException(this);
}
/**
* Returns the derived unit underlying the reference time unit.
*
* @return The derived unit underlying the reference time unit.
*/
public DerivedUnit getDerivedUnit() {
return getUnit().getDerivedUnit();
}
/**
* Provides support for Converter-s.
*/
protected static final class MyConverter extends ConverterImpl {
private final double offset;
private final Converter converter;
protected MyConverter(final TimeScaleUnit fromUnit, final Unit toUnit)
throws ConversionException {
super(fromUnit, toUnit);
converter = fromUnit.getUnit().getConverterTo(
((TimeScaleUnit) toUnit).getUnit());
offset = SI.SECOND.convertTo(
(fromUnit.getOrigin().getTime() - ((TimeScaleUnit) toUnit)
.getOrigin().getTime()) / 1000.0,
((TimeScaleUnit) toUnit).getUnit());
}
public double convert(final double amount) {
return converter.convert(amount) + offset;
}
public float[] convert(final float[] input, float[] output) {
output = converter.convert(input, output);
for (int i = input.length; --i >= 0;) {
output[i] += offset;
}
return output;
}
public double[] convert(final double[] input, double[] output) {
output = converter.convert(input, output);
for (int i = input.length; --i >= 0;) {
output[i] += offset;
}
return output;
}
}
/**
* Returns a Converter for converting numeric values from this unit to
* another unit.
*
* @param outputUnit
* The other unit. Shall be a TimeScaleUnit.
* @return A Converter.
* @throws ConversionException
* outputUnit is not a TimeScaleUnit.
*/
@Override
public Converter getConverterTo(final Unit outputUnit)
throws ConversionException {
return new MyConverter(this, outputUnit);
}
/**
* Indicates if numeric values in this unit are convertible to another unit.
*
* @param that
* The other unit.
* @return true if and only if numeric values in this unit are
* convertible to
* that.
*/
@Override
public final boolean isCompatible(final Unit that) {
return that instanceof TimeScaleUnit;
}
/**
* Indicates if this unit is semantically identical to an object.
*
* @param object
* The object.
* @return true if and only if this unit is semantically
* identical to object
* .
*/
@Override
public boolean equals(final Object object) {
if (this == object) {
return true;
}
if (!(object instanceof TimeScaleUnit)) {
return false;
}
final TimeScaleUnit that = (TimeScaleUnit) object;
return _origin.equals(that._origin) && _unit.equals(that._unit);
}
/**
* Returns the hash code of this instance.
*
* @return The hash code of this instance.
*/
@Override
public int hashCode() {
return getUnit().hashCode() ^ getOrigin().hashCode();
}
/**
* Indicates if this unit is dimensionless. TimeScaleUnit-s are never
* dimensionless.
*
* @return false.
*/
public boolean isDimensionless() {
return false; // a TimeScaleUnit is never dimensionless by definition
}
/**
* Returns the string representation of this unit.
*
* @return The string representation of this unit.
*/
@Override
public String toString() {
final String string = super.toString(); // get symbol or name
return string != null
? string
: getCanonicalString();
}
/**
* Returns the canonical string representation of the unit.
*
* @return The canonical string representation.
*/
public String getCanonicalString() {
return getUnit().toString() + dateFormat.format(getOrigin());
}
/**
* Tests this class.
*/
public static void main(final String[] args) throws Exception {
final TimeZone tz = TimeZone.getTimeZone("UTC");
final Calendar calendar = Calendar.getInstance(tz);
calendar.clear();
calendar.set(1970, 0, 1);
new TimeScaleUnit(SECOND, calendar.getTime());
}
}
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