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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/DeveloperTools/index.html">Tools</a> > <a href="../../samplecode/DeveloperTools/idxXcode-date.html">Xcode</a> > <A HREF="javascript:location.replace('index.html');">TemperatureTester</A> >
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<h2>/RankineValueTransformer.m</h2>
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<p><strong><a href="TemperatureTester.zip">Download Sample</a></strong> (“TemperatureTester.zip”, 27.4K)<BR>
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<pre class="sourcecodebox">/*
RankineValueTransformer.m
Copyright (c) 2003-2004, Apple Computer, Inc., all rights reserved.
Converts Kelvin units to Rankine units. Supports reverse
transformations.
*/
/*
IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
consideration of your agreement to the following terms, and your use, installation,
modification or redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject to these
terms, Apple grants you a personal, non-exclusive license, under Apple’s copyrights in
this original Apple software (the "Apple Software"), to use, reproduce, modify and
redistribute the Apple Software, with or without modifications, in source and/or binary
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or logos of Apple Computer, Inc. may be used to endorse or promote products derived from
the Apple Software without specific prior written permission from Apple. Except as expressly
stated in this notice, no other rights or licenses, express or implied, are granted by Apple
herein, including but not limited to any patent rights that may be infringed by your
derivative works or by other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS
USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
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WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR
OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import <Foundation/Foundation.h>
#import "RankineValueTransformer.h"
@implementation RankineValueTransformer
+ (Class)transformedValueClass
{
return [NSNumber class];
}
+ (BOOL)allowsReverseTransformation
{
return YES;
}
- (id)transformedValue:(id)value
{
if (value == nil) return nil;
if (![value respondsToSelector: @selector(doubleValue)]) {
[NSException raise: NSInternalInconsistencyException
format: @"Value does not respond to -doubleValue. No idea what to do. (Value is an instance of %@).",
[value class]];
}
float kelvinInputValue = [value doubleValue]; // handles NSString and NSNumber
float rankineOutputValue = kelvinInputValue * 1.8;
return [NSNumber numberWithDouble: rankineOutputValue];
}
- (id)reverseTransformedValue:(id)value
{
if (value == nil) return nil;
if (![value respondsToSelector: @selector(doubleValue)]) {
[NSException raise: NSInternalInconsistencyException
format: @"Value does not respond to -doubleValue. No idea what to do. (Value is an instance of %@).",
[value class]];
}
float rankineInputValue = [value doubleValue]; // handles NSString and NSNumber
float kelvinOutputValue = rankineInputValue / 1.8;
return [NSNumber numberWithDouble: kelvinOutputValue];
}
@end
</pre>
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