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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "base/ios/ns_error_util.h"
#import <Foundation/Foundation.h>
#include "base/logging.h"
#include "base/mac/scoped_nsobject.h"
namespace base {
namespace ios {
namespace {
// Iterates through |error|'s underlying errors and returns them in an array.
NSArray* GetFullErrorChainForError(NSError* error) {
NSMutableArray* error_chain = [NSMutableArray array];
NSError* current_error = error;
while (current_error) {
DCHECK([current_error isKindOfClass:[NSError class]]);
[error_chain addObject:current_error];
current_error = current_error.userInfo[NSUnderlyingErrorKey];
}
return error_chain;
}
} // namespace
NSError* GetFinalUnderlyingErrorFromError(NSError* error) {
DCHECK(error);
return [GetFullErrorChainForError(error) lastObject];
}
NSError* ErrorWithAppendedUnderlyingError(NSError* original_error,
NSError* underlying_error) {
DCHECK(original_error);
DCHECK(underlying_error);
NSArray* error_chain = GetFullErrorChainForError(original_error);
NSError* current_error = underlying_error;
for (NSInteger idx = error_chain.count - 1; idx >= 0; --idx) {
NSError* error = error_chain[idx];
scoped_nsobject<NSMutableDictionary> user_info(
[error.userInfo mutableCopy]);
[user_info setObject:current_error forKey:NSUnderlyingErrorKey];
current_error = [NSError errorWithDomain:error.domain
code:error.code
userInfo:user_info];
}
return current_error;
}
} // namespace ios
} // namespace base
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