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CHAPTER 12 SERIALIZATION
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Note Backward compatibility is the ability of a newer version of a class/application to interpret data created by
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an older version. Forward compatibility is the ability of an older version of a class/application to, at least partially, interpret the data created by a newer version.
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How you provide backward, or forward, compatibility in Objective-C depends on the archive type.
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Forward and Backward Compatibility in Keyed Archives
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Keyed archives confer one huge advantage: flexible compatibility between class versions. An improved version of the ScheduledEvent class, shown in Listing 12-10, has changed a little from the initial version in Listing 12-4. It contains a new time zone object and the duration value has been replaced with an end time object.
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Listin g 12-10. Forward and Backward Compatibility in a Keyed Archive
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@interface ScheduledEvent : NSObject <NSCoding> { @private NSDate *startTime; NSDate *endTime; NSTimeZone *timeZone; RoomIdentifier room; } @implementation ScheduledEvent - (id)initWithCoder:(NSCoder*)decoder { self = [super init]; if (self != nil) { if ([decoder containsValueForKey:@"TimeZone"]) timeZone = [decoder decodeObjectForKey:@"TimeZone"]; else timeZone = [NSTimeZone localTimeZone]; startTime = [decoder decodeObjectForKey:@"Start"]; if ([decoder containsValueForKey:@"End"]) { endTime = [decoder decodeObjectForKey:@"End"]; } else { NSTimeInterval duration = [decoder decodeDoubleForKey:@"Duration"]; endTime = [startTime addTimeInterval:duration]; }
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CHAPTER 12 SERIALIZATION
room.buildingNo = [decoder decodeInt32ForKey:@"Room.building"]; room.roomNo = [decoder decodeInt32ForKey:@"Room.number"]; } return self; } - (void)encodeWithCoder:(NSCoder*)encoder { [encoder encodeObject:startTime forKey:@"Start"]; [encoder encodeObject:endTime forKey:@"End"]; [encoder encodeObject:timeZone forKey:@"TimeZone"]; [encoder encodeInt32:room.buildingNo forKey:@"Room.building"]; [encoder encodeInt32:room.roomNo forKey:@"Room.number"]; [encoder encodeDouble:[endTime timeIntervalSinceDate:startTime] forKey:@"Duration"]; } @end The implementation in Listing 12-10 provides both forward and backward compatibility with its initial version. That is, the new version of the class can decode archives created by the original version, and the original version can decode archives created by the new version. This is accomplished through judicious use of archive keys. The new version of ScheduledEvent has a time zone object that the old version lacks. The new version uses the -containsValueForKey: method to determine if the archive it s decoding contains a value for that key. If it does, it reads the value. If not, it assumes that the archive was created by an earlier version of the class and supplies a reasonable default. An old version of the class reading a newer archive ignores the value, knowing nothing about time zones. The replacement of the duration variable with endTime requires a little more work. Again, -initWithCoder: uses [decoder containsValueForKey:@"End"] to determine if the archive contains an End value. Modern archives would, but old archives wouldn t. The new class assumes that a missing End value implies that it s reading an older version of the archive; it uses the Duration value written by the old version to construct an equivalent endTime object. To provide forward compatibility, it archives the endTime value twice. Once as an NSDate object and again as an NSTimeInterval compatible with the class s original duration value. An alternate way of maintaining compatibility would be to not encode the endTime object at all and continue to encode the Duration value, compatible with the old version. This would be the preferred solution when the new property is logically equivalent to the old one, and easily converted. Here are a few tips for maintaining backward, and potentially forward, compatibility in keyed archives: Test for the existence of keys added in later versions of the class. The absence of a key indicates the archive was created with an earlier version. If a value changes type, encode it using a new key. The integer and floating point decoding methods perform some modest type conversion. All of the integer encoding and decoding methods are interchangeable, as are the floating-point methods. Thus, you can encode a number as a 32 bit integer, then decode it as a 64-bit integer and vice versa. Initialize values for missing keys with something reasonable.
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For forward compatibility, continue to write the keys and values that earlier versions of the class expect, or translate newer values into values compatible with older classes. Consider inserting a version value, or any other kind of hint, that would help future classes determine how the archive values should be interpreted. The statement [encoder encodeBool:YES forKey:@"isTimeZoneSavvy"] would inform future decoders that this archive was created with a version of the class that understands time zones.
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