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EXSorting.m
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//
// EXSorting.m
// Entropy
// (C) 2007-2009 Codesign
// Licensed under LGPL (v3)
//
#import "EXSorting.h"
#import "EXException.h"
#import <objc/runtime.h>
NSInteger EXSortingFunction(id obj1, id obj2, void* context) {
EXSorting* sorting = context;
NSString* fieldName = [sorting fieldName];
BOOL descending = [sorting isDescending];
void *_value1, *_value2;
Ivar ivar1 = object_getInstanceVariable(obj1, [fieldName UTF8String], &_value1);
if (ivar1 == NULL) [EXException raise: @"EXException" format: @"Unknown instance variable"];
Ivar ivar2 = object_getInstanceVariable(obj2, [fieldName UTF8String], &_value2);
if (ivar2 == NULL) [EXException raise: @"EXException" format: @"Unknown instance variable"];
NSString* type1 = [NSString stringWithUTF8String: ivar_getTypeEncoding(ivar1)];
NSString* type2 = [NSString stringWithUTF8String: ivar_getTypeEncoding(ivar2)];
if ([type1 isEqual: @"i"] && [type2 isEqual: @"i"]) {
int value1 = *(int*)((void*)obj1 + ivar_getOffset(ivar1));
int value2 = *(int*)((void*)obj2 + ivar_getOffset(ivar2));
return descending == NO ? (value1 < value2 ? NSOrderedAscending : value1 == value2 ? NSOrderedSame : NSOrderedDescending)
: (value1 < value2 ? NSOrderedDescending : value1 == value2 ? NSOrderedSame : NSOrderedAscending);
} else if ([type1 isEqual: @"l"] && [type2 isEqual: @"l"]) {
long value1 = *(long*)((void*)obj1 + ivar_getOffset(ivar1));
long value2 = *(long*)((void*)obj2 + ivar_getOffset(ivar2));
return descending == NO ? (value1 < value2 ? NSOrderedAscending : value1 == value2 ? NSOrderedSame : NSOrderedDescending)
: (value1 < value2 ? NSOrderedDescending : value1 == value2 ? NSOrderedSame : NSOrderedAscending);
} else if ([type1 isEqual: @"f"] && [type2 isEqual: @"f"]) {
float value1 = *(float*)((void*)obj1 + ivar_getOffset(ivar1));
float value2 = *(float*)((void*)obj2 + ivar_getOffset(ivar2));
return descending == NO ? (value1 < value2 ? NSOrderedAscending : value1 == value2 ? NSOrderedSame : NSOrderedDescending)
: (value1 < value2 ? NSOrderedDescending : value1 == value2 ? NSOrderedSame : NSOrderedAscending);
} else if ([type1 isEqual: @"d"] && [type2 isEqual: @"d"]) {
double value1 = *(double*)((void*)obj1 + ivar_getOffset(ivar1));
double value2 = *(double*)((void*)obj2 + ivar_getOffset(ivar2));
return descending == NO ? (value1 < value2 ? NSOrderedAscending : value1 == value2 ? NSOrderedSame : NSOrderedDescending)
: (value1 < value2 ? NSOrderedDescending : value1 == value2 ? NSOrderedSame : NSOrderedAscending);
} else if ([type1 characterAtIndex: 0] == '@' && [type2 characterAtIndex: 0] == '@') {
id value1 = object_getIvar(obj1, ivar1);
id value2 = object_getIvar(obj2, ivar2);
if (value1 != nil && value2 != nil) {
return descending == NO ? [value1 compare: value2] : [value2 compare: value1];
} else if (value1 == nil && value2 == nil) {
return NSOrderedSame;
} else if (value1 == nil && value2 != nil) {
return descending == NO ? NSOrderedAscending : NSOrderedDescending;
} else {
return descending == YES ? NSOrderedAscending : NSOrderedDescending;
}
}
[EXException raise: @"EXException" format: @"Sorting error"];
return NSOrderedSame;
}
@implementation EXSorting
- (id)initWithFieldName:(NSString*)_fieldName {
return [self initWithFieldName: _fieldName descending: NO];
}
- (id)initWithFieldName:(NSString*)_fieldName descending:(BOOL)_descending {
if (self = [super init]) {
fieldName = [_fieldName retain];
descending = _descending;
}
return self;
}
+ (id)sortingFieldName:(NSString*)_fieldName descending:(BOOL)_descending {
return [[[self alloc] initWithFieldName: _fieldName descending: _descending] autorelease];
}
- (NSString*)fieldName {
return fieldName;
}
- (BOOL)isDescending {
return descending;
}
- (void)dealloc {
[fieldName release];
[super dealloc];
}
@end