keychain/categories/NSError+UsefulConstructors.m

   1 /*
   2  * Copyright (c) 2018 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #import "NSError+UsefulConstructors.h"
  26
  27 @implementation NSError (UsefulConstructors)
  28
  29 + (instancetype)errorWithDomain:(NSErrorDomain)domain code:(NSInteger)code description:(NSString*)description {
  30     return [NSError errorWithDomain:domain code:code description:description underlying:nil];
  31 }
  32
  33 + (instancetype)errorWithDomain:(NSErrorDomain)domain code:(NSInteger)code description:(NSString*)description underlying:(NSError*)underlying {
  34     // Obj-C throws a fit if there's nulls in dictionaries, so we can't use a dictionary literal here.
  35     // Use the null-assignment semantics of NSMutableDictionary to make a dictionary either with either, both, or neither key.
  36     NSMutableDictionary* mut = [[NSMutableDictionary alloc] init];
  37     mut[NSLocalizedDescriptionKey] = description;
  38     mut[NSUnderlyingErrorKey] = underlying;
  39
  40     return [NSError errorWithDomain:domain code:code userInfo:mut];
  41 }
  42
  43 @end