Hello, I'm thinking of implementing a Custom Value Transformer to add
PDFDocument support to a MangedObject. I just want to see if I'm on
the right track or not. The code below works, I'm just not sure if
this is the proper way to do this. Thanks for your feedback.
@implementation PDFDataTransformer
+ (Class)transformedValueClass { return [NSData class]; }
+ (BOOL)allowsReverseTransformation { return YES; }
- (id)transformedValue:(id)value
{
NSData *pdfDocAsData = nil;
if (value == nil) return nil;
// Attempt to get a reasonable value from the
// value object.
if ([value respondsToSelector: @selector(dataRepresentation)]) {
pdfDocAsData = [value dataRepresentation];
} else {
[NSException raise: NSInternalInconsistencyException
format: @"Value (%@) does not respond to -
dataRepresentation.",
[value class]];
}
return [pdfDocAsData autorelease];
}
- (id)reverseTransformedValue:(id)value
{
PDFDocument *pdfDoc = nil;
pdfDoc = [[PDFDocument alloc] initWithData:value];
return [pdfDoc autorelease];
}
----------------------------------------------------------------------------------------------------------
My other approach was to add an pdfDoc ivar & property and add this
code:
- (void) init { pdfDoc = [[PDFDocument alloc] init]; }
- (void) dealloc { [pdfDoc release]; }
and change - (id)reverseTransformedValue:(id)value to:
- (id)reverseTransformedValue:(id)value
{
[pdfDoc initWithData:value];
return pdfDoc;
}
Any suggestions?
Thank you all again for you expertise.
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