trunk/NumberInput 2/ConversionEngine.m

/*
 
File:ConversionEngine.m
 
Abstract: A simple conversion engine.  This converts number strings into one of the formats supported by NSNumberFormatter.
 
Version: 1.0
 
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*/
#import "ConversionEngine.h"
 
 
@implementation ConversionEngine
 
-(void)awakeFromNib
{
    [self setConversionMode:NSNumberFormatterDecimalStyle];
    
}
 
-(NSString*)convert:(NSString*)string
{
    // Allocate the formatter lazily
    // We want to use the 10.4 methods of NSNumberFormatter so we allocate it here and set the default behavior to the 10.4 behavior.
    // See comment below from documentation.
    
    /*
    Important:  The pre-Mac OS X v10.4 methods of NSNumberFormatter are not compatible with the methods added for Mac OS X v10.4. An NSNumberFormatter object should not invoke methods in these different behavior groups indiscriminately. Use the old-style methods if you have configured the number-formatter behavior to be NSNumberFormatterBehavior10_0. Use the new methods instead of the older-style ones if you have configured the number-formatter behavior to be NSNumberFormatterBehavior10_4.
    Note also that number formatters created in Interface Builder use the Mac OS X v10.0 behavior—see NSNumberFormatter on Mac OS X v10.4.
    */
    
    if ( formatter == nil ) {
        // Specify that I want the modern 10.4 behavior
        [NSNumberFormatter setDefaultFormatterBehavior:NSNumberFormatterBehavior10_4];
        // Now allocate our formatter
        formatter = [[NSNumberFormatter alloc] init];       
    }
    
    // Convert the string into a number first
    // We set the conversion style each time in case it has changed.
    [formatter setNumberStyle:NSNumberFormatterNoStyle];
    
    NSNumber*       number = [formatter numberFromString:string];
    NSLog(@"convert:\n\tnumber: %@\n\tstring: %@", number, string);
    
    //Now convert the number to the right format string
    [formatter setNumberStyle:[self conversionMode]];
    return [formatter stringFromNumber:number];
}
 
-(NSNumberFormatterStyle)conversionMode {
    return conversionMode;
}
 
-(void)setConversionMode:(NSNumberFormatterStyle)mode
{
    conversionMode = mode;
    NSLog(@"set mode to %ld", conversionMode);
}
 
@end