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//
// GTMNSDictionary+CaseInsensitive.m
//
// Copyright 2009 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMNSDictionary+CaseInsensitive.h"
#import "GTMDefines.h"
#import <CoreFoundation/CoreFoundation.h>
@interface NSMutableDictionary (GTMNSMutableDictionaryCaseInsensitiveAdditions)
// Returns a mutable equivalent to GTMNSDictionaryCaseInsensitiveAdditions.
- (id)gtm_initWithDictionaryCaseInsensitive:(NSDictionary *)dictionary;
@end
static Boolean CaseInsensitiveEqualCallback(const void *a, const void *b) {
id idA = (id)a;
id idB = (id)b;
Boolean ret = FALSE;
if ([idA isKindOfClass:[NSString class]] &&
[idB isKindOfClass:[NSString class]]) {
ret = ([idA compare:idB options:NSCaseInsensitiveSearch|NSLiteralSearch]
== NSOrderedSame);
} else {
ret = [idA isEqual:idB];
}
return ret;
}
static CFHashCode CaseInsensitiveHashCallback(const void *value) {
id idValue = (id)value;
CFHashCode ret = 0;
if ([idValue isKindOfClass:[NSString class]]) {
ret = [[idValue lowercaseString] hash];
} else {
ret = [idValue hash];
}
return ret;
}
@implementation NSDictionary (GTMNSDictionaryCaseInsensitiveAdditions)
- (id)gtm_initWithDictionaryCaseInsensitive:(NSDictionary *)dictionary {
[self release];
self = nil;
CFIndex count = 0;
void *keys = NULL;
void *values = NULL;
if (dictionary) {
count = CFDictionaryGetCount((CFDictionaryRef)dictionary);
if (count) {
keys = malloc(count * sizeof(void *));
values = malloc(count * sizeof(void *));
if (!keys || !values) {
free(keys);
free(values);
return self;
}
CFDictionaryGetKeysAndValues((CFDictionaryRef)dictionary, keys, values);
}
}
CFDictionaryKeyCallBacks keyCallbacks = kCFCopyStringDictionaryKeyCallBacks;
_GTMDevAssert(keyCallbacks.version == 0,
@"CFDictionaryKeyCallBacks structure updated");
keyCallbacks.equal = CaseInsensitiveEqualCallback;
keyCallbacks.hash = CaseInsensitiveHashCallback;
self = (id)CFDictionaryCreate(kCFAllocatorDefault,
keys, values, count, &keyCallbacks,
&kCFTypeDictionaryValueCallBacks);
free(keys);
free(values);
return self;
}
+ (id)gtm_dictionaryWithDictionaryCaseInsensitive:(NSDictionary *)dictionary {
return [[[self alloc]
gtm_initWithDictionaryCaseInsensitive:dictionary] autorelease];
}
@end
@implementation NSMutableDictionary (GTMNSMutableDictionaryCaseInsensitiveAdditions)
- (id)gtm_initWithDictionaryCaseInsensitive:(NSDictionary *)dictionary {
if ((self = [super gtm_initWithDictionaryCaseInsensitive:dictionary])) {
id copy = (id)CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0,
(CFDictionaryRef)self);
[self release];
self = copy;
}
return self;
}
@end
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