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//
// NSFileManager+DirectoryLocations.m
//
// Created by Matt Gallagher on 06 May 2010
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software. Permission is granted to anyone to
// use this software for any purpose, including commercial applications, and to
// alter it and redistribute it freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source
// distribution.
//
#import "NSFileManager+DirectoryLocations.h"
enum
{
DirectoryLocationErrorNoPathFound,
DirectoryLocationErrorFileExistsAtLocation
};
NSString * const DirectoryLocationDomain = @"DirectoryLocationDomain";
@implementation NSFileManager (DirectoryLocations)
//
// findOrCreateDirectory:inDomain:appendPathComponent:error:
//
// Method to tie together the steps of:
// 1) Locate a standard directory by search path and domain mask
// 2) Select the first path in the results
// 3) Append a subdirectory to that path
// 4) Create the directory and intermediate directories if needed
// 5) Handle errors by emitting a proper NSError object
//
// Parameters:
// searchPathDirectory - the search path passed to NSSearchPathForDirectoriesInDomains
// domainMask - the domain mask passed to NSSearchPathForDirectoriesInDomains
// appendComponent - the subdirectory appended
// errorOut - any error from file operations
//
// returns the path to the directory (if path found and exists), nil otherwise
//
- (NSString *)findOrCreateDirectory:(NSSearchPathDirectory)searchPathDirectory
inDomain:(NSSearchPathDomainMask)domainMask
appendPathComponent:(NSString *)appendComponent
error:(NSError **)errorOut
{
//
// Search for the path
//
NSArray* paths = NSSearchPathForDirectoriesInDomains(
searchPathDirectory,
domainMask,
YES);
if ([paths count] == 0)
{
if (errorOut)
{
NSDictionary *userInfo =
[NSDictionary dictionaryWithObjectsAndKeys:
NSLocalizedStringFromTable(
@"No path found for directory in domain.",
@"Errors",
nil),
NSLocalizedDescriptionKey,
[NSNumber numberWithInteger:searchPathDirectory],
@"NSSearchPathDirectory",
[NSNumber numberWithInteger:domainMask],
@"NSSearchPathDomainMask",
nil];
*errorOut =
[NSError
errorWithDomain:DirectoryLocationDomain
code:DirectoryLocationErrorNoPathFound
userInfo:userInfo];
}
return nil;
}
//
// Normally only need the first path returned
//
NSString *resolvedPath = [paths objectAtIndex:0];
//
// Append the extra path component
//
if (appendComponent)
{
resolvedPath = [resolvedPath
stringByAppendingPathComponent:appendComponent];
}
//
// Create the path if it doesn't exist
//
NSError *error = nil;
BOOL success = [self
createDirectoryAtPath:resolvedPath
withIntermediateDirectories:YES
attributes:nil
error:&error];
if (!success)
{
if (errorOut)
{
*errorOut = error;
}
return nil;
}
//
// If we've made it this far, we have a success
//
if (errorOut)
{
*errorOut = nil;
}
return resolvedPath;
}
//
// applicationSupportDirectory
//
// Returns the path to the applicationSupportDirectory (creating it if it doesn't
// exist).
//
- (NSString *)applicationSupportDirectory
{
NSString *executableName =
[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleExecutable"];
NSError *error;
NSString *result =
[self
findOrCreateDirectory:NSApplicationSupportDirectory
inDomain:NSUserDomainMask
appendPathComponent:executableName
error:&error];
if (!result)
{
NSLog(@"Unable to find or create application support directory:\n%@", error);
}
return result;
}
@end
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