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/* Implementation of class NSMeasurement
Copyright (C) 2019 Free Software Foundation, Inc.
By: Gregory John Casamento <greg.casamento@gmail.com>
Date: Mon Sep 30 15:58:21 EDT 2019
This file is part of the GNUstep Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
*/
#import "Foundation/NSArchiver.h"
#import "Foundation/NSException.h"
#import "Foundation/NSKeyedArchiver.h"
#import "Foundation/NSMeasurement.h"
#import "Foundation/NSUnit.h"
@implementation NSMeasurement
// Creating Measurements
- (instancetype) initWithDoubleValue: (double)doubleValue
unit: (NSUnit *)unit
{
self = [super init];
if (self != nil)
{
ASSIGNCOPY(_unit, unit);
_doubleValue = doubleValue;
}
return self;
}
- (void) dealloc
{
RELEASE(_unit);
[super dealloc];
}
// Accessing unit and value
- (NSUnit *) unit
{
return _unit;
}
- (double) doubleValue
{
return _doubleValue;
}
// Conversion
- (BOOL) canBeConvertedToUnit: (NSUnit *)unit
{
return ([unit isKindOfClass: [_unit class]] &&
[unit respondsToSelector: @selector(converter)]);
}
- (NSMeasurement *) measurementByConvertingToUnit: (NSUnit *)unit
{
if ([self canBeConvertedToUnit: unit])
{
NSMeasurement *result = nil;
double val = 0.0;
// Do conversion...
NSUnitConverter *c = [(NSDimension *)_unit converter];
val = [c baseUnitValueFromValue: _doubleValue];
c = [(NSDimension *)unit converter];
val = [c valueFromBaseUnitValue: val];
result = [[NSMeasurement alloc] initWithDoubleValue: val unit: unit];
return AUTORELEASE(result);
}
else
{
[NSException raise: NSInvalidArgumentException
format: @"Cannot convert from %@ to %@", _unit, unit];
}
return nil;
}
// Operating
- (NSMeasurement *) measurementByAddingMeasurement: (NSMeasurement *)measurement
{
NSMeasurement *newMeasurement = [measurement measurementByConvertingToUnit: _unit];
double v = _doubleValue + [newMeasurement doubleValue];
NSMeasurement *result = [[NSMeasurement alloc] initWithDoubleValue: v unit: _unit];
return AUTORELEASE(result);
}
- (NSMeasurement *) measurementBySubtractingMeasurement: (NSMeasurement *)measurement
{
NSMeasurement *newMeasurement = [measurement measurementByConvertingToUnit: _unit];
double v = _doubleValue - [newMeasurement doubleValue];
NSMeasurement *result = [[NSMeasurement alloc] initWithDoubleValue: v unit: _unit];
return AUTORELEASE(result);
}
// NSCopying
- (id) copyWithZone: (NSZone *)zone
{
return [[[self class] allocWithZone: zone] initWithDoubleValue: _doubleValue
unit: _unit];
}
// NSCoding
- (void) encodeWithCoder: (NSCoder *)coder
{
if ([coder allowsKeyedCoding])
{
[coder encodeObject: _unit forKey: @"NS.unit"];
[coder encodeDouble: _doubleValue forKey: @"NS.value"];
}
else
{
[coder encodeObject: _unit];
[coder encodeValueOfObjCType: @encode(double) at: &_doubleValue];
}
}
- (id) initWithCoder: (NSCoder *)coder
{
if ((self = [super init]) != nil)
{
if ([coder allowsKeyedCoding])
{
_unit = [coder decodeObjectForKey: @"NS.unit"];
_doubleValue = [coder decodeDoubleForKey: @"NS.value"];
}
else
{
_unit = [coder decodeObject];
[coder decodeValueOfObjCType: @encode(double) at: &_doubleValue];
}
}
return self;
}
@end
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