/*

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

-(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 behaviorÑsee 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:[self conversionMode]];

    NSNumber*       number = [formatter numberFromString:string];

    // Now convert the number to the right format string

    return [formatter stringFromNumber:number];

}

-(NSNumberFormatterStyle)conversionMode {

    return NSNumberFormatterDecimalStyle;

}

@end