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Type-checking convenience accessors for NSArray, NSDictionary and NSUserDefaults.
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JAPropertyListAccessors Convenience accessors for NSArray, NSDictionary and NSUserDefaults. In addition to being convenient, these perform type checking. Which is, y’know, good to have. Each method has a ja_<type>AtIndex: or ja_<type>ForKey: variant and a ja_<type>AtIndex:defaultValue:/ja_<type>ForKey:defaultValue: variant. The default value for the simpler variants is always 0, NO or nil. Note on types: ideally, stdint.h types would be used for integers. However, NSNumber doesn’t do this, so doing so portably would add new complications. The various integer methods will always clamp values to the range of the return type, rather than truncating like NSNumber. The “Integer” variants are intended to be used with NSInteger variables. They’re typed long, which is the same size as NSInteger on all platforms. Similarly, all array indices are typed unsigned long. Set accessors aren’t provided for all integer types, since there are no overflow issues in those cases. The “non-negative float”/“non-negative double” variants will clamp read values to zero if negative, but will return a negative defaultValue unchanged. Functions used to convert objects to various numerical types are at the bottom of the header. Set accessors automatically convert arrays to set if necessary. String accessors automatically convert NSNumbers and NSDates (but extracting dates and using NSDateFormatter is generally a better plan if a date is what you expect). Array accessors return default value rather than throwing if index is out of bounds -- except objectAtIndex:defaultValue:, for parity with objectAtIndex:. The methods objectAtIndexNoThrow:[defaultValue:] are provided to get this behaviour for arbitrary objects. CHANGE LOG 1.2 ARC compatibility. 1.1 Added ja_ prefix to all methods. Unprefixed category methods on framework classes are bad - and in this case caused at least one crashing conflict with a third-party input manager hack. 1.0.2 Objective-C++ compatible. 1.0.1 Default value (rather than nil) is now returned when conversion to string fails. String conversion now uses -stringValue if available. 1.0 Initial release. Copyright © 2007–2010 Jens Ayton Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.