darling-cocotron/Foundation/NSSortDescriptor.m

/* Copyright (c) 2007 Christopher J. W. Lloyd

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. */

#import <Foundation/NSCoder.h>
#import <Foundation/NSKeyValueCoding.h>
#import <Foundation/NSKeyedUnarchiver.h>
#import <Foundation/NSRaise.h>
#import <Foundation/NSSortDescriptor.h>
#import <Foundation/NSString.h>

@implementation NSSortDescriptor

+ sortDescriptorWithKey: (NSString *) key ascending: (BOOL) ascending {
    return [[[NSSortDescriptor allocWithZone: NULL] initWithKey: key
                                                      ascending: ascending
                                                       selector: NULL]
            autorelease];
}

+ sortDescriptorWithKey: (NSString *) key
              ascending: (BOOL) ascending
               selector: (SEL) selector
{
    return [[[NSSortDescriptor allocWithZone: NULL] initWithKey: key
                                                      ascending: ascending
                                                       selector: selector]
            autorelease];
}

- initWithKey: (NSString *) key ascending: (BOOL) ascending {
    return [self initWithKey: key ascending: ascending selector: NULL];
}

- initWithKey: (NSString *) key
        ascending: (BOOL) ascending
         selector: (SEL) selector
{
    _key = [key copy];
    _ascending = ascending;

    if (selector == NULL) // Yes it does this
        _selector = @selector(compare:);
    else
        _selector = selector;
    return self;
}

- (void) dealloc {
    [_key release];
    [super dealloc];
}

- copyWithZone: (NSZone *) zone {
    return [self retain];
}

- (NSString *) key {
    return _key;
}

- (BOOL) ascending {
    return _ascending;
}

- (SEL) selector {
    return _selector;
}

- (NSComparisonResult) compareObject: first toObject: second {
    id checkFirst = [first valueForKeyPath: _key];
    id checkSecond = [second valueForKeyPath: _key];
    NSComparisonResult result;

    if (_ascending)
        result = (NSComparisonResult) [checkFirst performSelector: _selector
                                                       withObject: checkSecond];
    else
        result = (NSComparisonResult) [checkSecond performSelector: _selector
                                                        withObject: checkFirst];

    return result;
}

- reversedSortDescriptor {
    return [[[[self class] alloc] initWithKey: _key
                                    ascending: !_ascending
                                     selector: _selector] autorelease];
}

- (void) encodeWithCoder: (NSCoder *) coder {
    if ([coder allowsKeyedCoding]) {
        [coder encodeObject: _key forKey: @"Key"];
        [coder encodeBool: _ascending forKey: @"Ascending"];
        [coder encodeObject: NSStringFromSelector(_selector)
                     forKey: @"Selector"];
    } else {
        [coder encodeObject: _key];
        [coder encodeValueOfObjCType: @encode(BOOL) at: &_ascending];
        [coder encodeObject: NSStringFromSelector(_selector)];
    }
}

- (id) initWithCoder: (NSCoder *) coder {
    if ([coder allowsKeyedCoding]) {
        NSKeyedUnarchiver *keyed = (NSKeyedUnarchiver *) coder;
        _key = [[keyed decodeObjectForKey: @"Key"] copy];
        _ascending = [keyed decodeBoolForKey: @"Ascending"];
        _selector =
                NSSelectorFromString([keyed decodeObjectForKey: @"Selector"]);
    }

    else {
        _key = [[coder decodeObject] copy];
        [coder decodeValueOfObjCType: @encode(BOOL) at: &_ascending];
        _selector = NSSelectorFromString([coder decodeObject]);
    }

    return self;
}

@end