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CKAbstractConnection.m
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CKAbstractConnection.m
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/*
Copyright (c) 2004-2006 Karelia Software. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution.
Neither the name of Karelia Software nor the names of its contributors may be used to
endorse or promote products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "CKAbstractConnection.h"
#import "CKConnectionClient.h"
#import "CKTransferRecord.h"
#import "UKKQueue.h"
#import "CKConnectionThreadManager.h"
#import "InterThreadMessaging.h"
#import "NSString+Connection.h"
#import "NSURL+Connection.h"
#import "KTLog.h"
NSString *CKConnectionErrorDomain = @"ConnectionErrorDomain";
// Command Dictionary Keys
NSString *CKConnectionAwaitStateKey = @"ConnectionAwaitStateKey";
NSString *CKConnectionSentStateKey = @"ConnectionSentStateKey";
NSString *CKConnectionCommandKey = @"ConnectionCommandKey";
// Attributes for which there isn't a corresponding NSFileManager key
NSString *cxFilenameKey = @"cxFilenameKey";
NSString *cxSymbolicLinkTargetKey = @"cxSymbolicLinkTargetKey";
// User Info Error Keys
NSString *ConnectionHostKey = @"ConnectionHostKey";
NSString *ConnectionDirectoryExistsKey = @"ConnectionDirectoryExistsKey";
NSString *ConnectionDirectoryExistsFilenameKey = @"ConnectionDirectoryExistsFilenameKey";
// Logging Domains
NSString *CKTransportDomain = @"Transport";
NSString *CKStateMachineDomain = @"State Machine";
NSString *CKParsingDomain = @"Parser";
NSString *CKProtocolDomain = @"Protocol";
NSString *CKConnectionDomain = @"Connection";
NSString *CKThreadingDomain = @"Threading";
NSString *CKStreamDomain = @"Stream";
NSString *CKInputStreamDomain = @"Input Stream";
NSString *CKOutputStreamDomain = @"Output Stream";
NSString *CKSSLDomain = @"SSL";
NSString *CKEditingDomain = @"Editing";
NSDictionary *sSentAttributes = nil;
NSDictionary *sReceivedAttributes = nil;
NSDictionary *sDataAttributes = nil;
@implementation CKAbstractConnection
+ (NSString *)name { return nil; }
+ (NSInteger)defaultPort { return 0; }
+ (NSArray *)URLSchemes { return nil; }
#pragma mark -
#pragma mark Transcript
/* The string attributes to use for the different types of transcript logging
*/
+ (NSAttributedString *)attributedStringForString:(NSString *)string transcript:(CKTranscriptType)transcript
{
NSDictionary *attributes = nil;
switch (transcript)
{
case CKTranscriptSent:
attributes = [self sentTranscriptStringAttributes];
break;
case CKTranscriptReceived:
attributes = [self receivedTranscriptStringAttributes];
break;
case CKTranscriptData:
attributes = [self dataTranscriptStringAttributes];
break;
}
NSAttributedString *result = [NSAttributedString attributedStringWithString:string attributes:attributes];
return result;
}
+ (NSDictionary *)sentTranscriptStringAttributes
{
if (!sSentAttributes)
sSentAttributes = [[NSDictionary alloc] initWithObjectsAndKeys:[NSFont fontWithName:@"Courier" size:11], NSFontAttributeName, [NSColor redColor], NSForegroundColorAttributeName, nil];
return sSentAttributes;
}
+ (NSDictionary *)receivedTranscriptStringAttributes
{
if (!sReceivedAttributes)
sReceivedAttributes = [[NSDictionary alloc] initWithObjectsAndKeys:[NSFont fontWithName:@"Courier-Bold" size:11], NSFontAttributeName, [NSColor blackColor], NSForegroundColorAttributeName, nil];
return sReceivedAttributes;
}
+ (NSDictionary *)dataTranscriptStringAttributes
{
if (!sDataAttributes)
sDataAttributes = [[NSDictionary alloc] initWithObjectsAndKeys:[NSFont fontWithName:@"Courier" size:11], NSFontAttributeName, [NSColor blueColor], NSForegroundColorAttributeName, nil];
return sDataAttributes;
}
#pragma mark -
#pragma mark Inheritable methods
- (id)initWithRequest:(CKConnectionRequest *)request
{
NSParameterAssert(request);
NSURL *URL = [request URL];
NSParameterAssert(URL); // Not supplying a URL is programmer error
// To start a connection we require the protocol to be one supported by the receiver. Subclasses may impose other restrictions.
if (![URL scheme] || ![[[self class] URLSchemes] containsObject:[URL scheme]])
{
[self release];
return nil;
}
if (self = [super init])
{
_request = [request copy];
_client = [[CKConnectionClient alloc] initWithConnection:self];
_edits = [[NSMutableDictionary dictionary] retain];
_cachedDirectoryContents = [[NSMutableDictionary dictionary] retain];
_isConnected = NO;
_name = [@"Default" retain];
}
return self;
}
- (void)dealloc
{
[_name release];
[_request release];
[_client release];
[_cachedDirectoryContents release];
[_edits release];
[_editWatcher release];
[_editingConnection forceDisconnect];
[_editingConnection release];
[super dealloc];
}
- (NSString *)description
{
return [NSString stringWithFormat:@"%@ - %@", [super description], _name];
}
- (CKConnectionRequest *)request { return _request; }
- (NSInteger)port
{
NSNumber *port = [[[self request] URL] port];
return (port) ? [port intValue] : [[self class] defaultPort];
}
- (void)setState:(CKConnectionState)state
{
_state = state;
}
- (CKConnectionState)state
{
return _state;
}
- (NSString *)stateName:(int)state
{
switch (state) {
case CKConnectionNotConnectedState: return @"ConnectionNotConnectedState";
case CKConnectionIdleState: return @"ConnectionIdleState";
case CKConnectionSentUsernameState: return @"ConnectionSentUsernameState";
case CKConnectionSentAccountState: return @"ConnectionSentAccountState";
case CKConnectionSentPasswordState: return @"ConnectionSentPasswordState";
case CKConnectionAwaitingCurrentDirectoryState: return @"ConnectionAwaitingCurrentDirectoryState";
case CKConnectionOpeningDataStreamState: return @"ConnectionOpeningDataStreamState";
case CKConnectionAwaitingDirectoryContentsState: return @"ConnectionAwaitingDirectoryContentsState";
case CKConnectionChangingDirectoryState: return @"ConnectionChangingDirectoryState";
case CKConnectionCreateDirectoryState: return @"ConnectionCreateDirectoryState";
case CKConnectionDeleteDirectoryState: return @"ConnectionDeleteDirectoryState";
case CKConnectionRenameFromState: return @"ConnectionRenameFromState";
case CKConnectionRenameToState: return @"ConnectionRenameToState";
case CKConnectionAwaitingRenameState: return @"ConnectionAwaitingRenameState";
case CKConnectionDeleteFileState: return @"ConnectionDeleteFileState";
case CKConnectionDownloadingFileState: return @"ConnectionDownloadingFileState";
case CKConnectionUploadingFileState: return @"ConnectionUploadingFileState";
case CKConnectionSentOffsetState: return @"ConnectionSentOffsetState";
case CKConnectionSentQuitState: return @"ConnectionSentQuitState";
case CKConnectionSentFeatureRequestState: return @"ConnectionSentFeatureRequestState";
case CKConnectionSettingPermissionsState: return @"ConnectionSettingPermissionsState";
case CKConnectionSentSizeState: return @"ConnectionSentSizeState";
case CKConnectionChangedDirectoryState: return @"CKConnectionChangedDirectoryState";
case CKConnectionSentDisconnectState: return @"CKConnectionSentDisconnectState";
default: return @"Unknown State";
}
}
- (void)setDelegate:(id)del
{
_delegate = del;
[_client setDelegate:del];
}
- (id)delegate
{
return _delegate;
}
- (void)cacheDirectory:(NSString *)path withContents:(NSArray *)contents
{
path = [path stringByStandardizingURLComponents];
[_cachedDirectoryContents setObject:contents forKey:path];
}
- (NSArray *)cachedContentsWithDirectory:(NSString *)path
{
path = [path stringByStandardizingURLComponents];
return [_cachedDirectoryContents objectForKey:path];
}
- (void)clearDirectoryCache
{
[_cachedDirectoryContents removeAllObjects];
}
#pragma mark -
#pragma mark Placeholder implementations
- (void)connect
{
if (!_isConnecting && ![self isConnected])
{
_isConnecting = YES;
[[[CKConnectionThreadManager defaultManager] prepareWithInvocationTarget:self] threadedConnect];
}
}
/* Subclasses are expected to implement their own connection code before calling this method to send the callback
*/
- (void)threadedConnect
{
_isConnected = YES;
_isConnecting = NO;
// Inform delegate
[[self client] connectionDidConnectToHost:[[[self request] URL] host] error:nil];
}
- (BOOL)isConnected { return _isConnected; }
- (void)disconnect
{
[[[CKConnectionThreadManager defaultManager] prepareWithInvocationTarget:self] threadedDisconnect];
}
- (void)threadedDisconnect
{
_isConnected = NO;
[[self client] connectionDidDisconnectFromHost:[[[self request] URL] host]];
}
- (void)forceDisconnect
{
[[[CKConnectionThreadManager defaultManager] prepareWithInvocationTarget:self] threadedForceDisconnect];
}
- (void)threadedForceDisconnect
{
_isConnected = NO;
[[self client] connectionDidDisconnectFromHost:[[[self request] URL] host]];
}
- (void)cleanupConnection
{
NSLog (@"base class clean up, do we have to clean anything?");
}
#define SUBCLASS_RESPONSIBLE @throw [NSException exceptionWithName:NSInternalInconsistencyException reason:[NSString stringWithFormat:@"%@ must implement %@", [self className], NSStringFromSelector(_cmd)] userInfo:nil];
- (void)changeToDirectory:(NSString *)dirPath
{
SUBCLASS_RESPONSIBLE
}
- (NSString *)currentDirectory
{
SUBCLASS_RESPONSIBLE
}
- (void)createDirectory:(NSString *)dirPath
{
SUBCLASS_RESPONSIBLE
}
- (void)createDirectory:(NSString *)dirPath permissions:(unsigned long)permissions
{
SUBCLASS_RESPONSIBLE
}
- (void)setPermissions:(unsigned long)permissions forFile:(NSString *)path
{
SUBCLASS_RESPONSIBLE
}
- (void)rename:(NSString *)fromPath to:(NSString *)toPath
{
SUBCLASS_RESPONSIBLE
}
- (void)recursivelyRenameS3Directory:(NSString *)fromDirectoryPath to:(NSString *)toDirectoryPath;
{
SUBCLASS_RESPONSIBLE
}
- (void)deleteFile:(NSString *)path
{
SUBCLASS_RESPONSIBLE
}
- (void)deleteDirectory:(NSString *)dirPath
{
SUBCLASS_RESPONSIBLE
}
- (void)recursivelyDeleteDirectory:(NSString *)path;
{
SUBCLASS_RESPONSIBLE
}
- (CKTransferRecord *)uploadFile:(NSString *)localPath
toFile:(NSString *)remotePath
checkRemoteExistence:(BOOL)flag
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)recursiveRecordWithPath:(NSString *)path root:(CKTransferRecord *)root
{
NSString *first = [path firstPathComponent];
if ([[root name] isEqualToString:first] || [[root path] isEqualToString:@"/"])
{
CKTransferRecord *child = nil;
NSEnumerator *e = [[root contents] objectEnumerator];
CKTransferRecord *cur;
if (![[root path] isEqualToString:@"/"])
{
path = [path stringByDeletingFirstPathComponent];
}
if ([path isEqualToString:@"/"])
{
return root;
}
while ((cur = [e nextObject]))
{
child = [self recursiveRecordWithPath:path root:cur];
if (child)
{
return child;
}
}
// if we get here we need to create the record
CKTransferRecord *tmp = root;
while (![path isEqualToString:@"/"])
{
cur = [CKTransferRecord recordWithName:[path firstPathComponent] size:0];
[tmp addContent:cur];
tmp = cur;
path = [path stringByDeletingFirstPathComponent];
}
return cur;
}
return nil;
}
- (void)_mergeRecord:(CKTransferRecord *)rec into:(CKTransferRecord *)root
{
CKTransferRecord *parent = [self recursiveRecordWithPath:[[rec name] stringByDeletingLastPathComponent] root:root];
[rec setName:[[rec name] lastPathComponent]];
[parent addContent:rec];
}
- (CKTransferRecord *)recursivelyUpload:(NSString *)localPath to:(NSString *)remotePath root:(CKTransferRecord *)root rootPath:(NSString *)rootPath ignoreHiddenFiles:(BOOL)ignoreHiddenFilesFlag
{
NSFileManager *fm = [NSFileManager defaultManager];
CKTransferRecord *record;
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
BOOL isDir;
//create this directory
[self createDirectory:remotePath];
NSEnumerator *e = [[fm contentsOfDirectoryAtPath:localPath error:NULL] objectEnumerator];
NSString *path;
NSUInteger numberOfSubRecordsAdded = 0;
while ((path = [e nextObject]))
{
path = [localPath stringByAppendingPathComponent:path];
if (ignoreHiddenFilesFlag && [[path lastPathComponent] hasPrefix:@"."])
continue;
numberOfSubRecordsAdded++;
if ([fm fileExistsAtPath:path isDirectory:&isDir] && isDir)
{
[self recursivelyUpload:path
to:[remotePath stringByAppendingPathComponent:[path lastPathComponent]]
root:root
rootPath:rootPath
ignoreHiddenFiles:ignoreHiddenFilesFlag];
}
else
{
NSString *remote = [remotePath stringByAppendingPathComponent:[path lastPathComponent]];
record = [self uploadFile:path
toFile:remote
checkRemoteExistence:NO
delegate:nil];
if (![[root path] isEqualToString:@"/"])
{
[self _mergeRecord:record into:root];
}
else
{
CKTransferRecord *parent = [self recursiveRecordWithPath:[[record name] stringByDeletingLastPathComponent] root:root];
root = parent;
[root setName:[[root name] lastPathComponent]];
[record setName:[[record name] lastPathComponent]];
[root addContent:record];
}
}
}
if (numberOfSubRecordsAdded == 0)
{
CKTransferRecord *record = [CKTransferRecord recordWithName:remotePath size:4];
if (![[root path] isEqualToString:@"/"])
{
[self _mergeRecord:record into:root];
}
else
{
CKTransferRecord *parent = [self recursiveRecordWithPath:[[record name] stringByDeletingLastPathComponent] root:root];
root = parent;
[root setName:[[root name] lastPathComponent]];
[record setName:[[record name] lastPathComponent]];
[root addContent:record];
}
[record transferDidFinish:record error:nil];
}
[pool release];
return root;
}
- (CKTransferRecord *)recursivelyUpload:(NSString *)localPath to:(NSString *)remotePath
{
return [self recursivelyUpload:localPath to:remotePath ignoreHiddenFiles:NO];
}
- (CKTransferRecord *)recursivelyUpload:(NSString *)localPath to:(NSString *)remotePath ignoreHiddenFiles:(BOOL)ignoreHiddenFilesFlag
{
CKTransferRecord *root = [CKTransferRecord rootRecordWithPath:remotePath];
[root setUpload:YES];
NSFileManager *fm = [NSFileManager defaultManager];
CKTransferRecord *record;
BOOL isDir;
[self startBulkCommands];
if ([fm fileExistsAtPath:localPath isDirectory:&isDir] && !isDir)
{
NSString *remote = [remotePath stringByAppendingPathComponent:[localPath lastPathComponent]];
record = [self uploadFile:localPath
toFile:remote
checkRemoteExistence:NO
delegate:nil];
if (![[root path] isEqualToString:@"/"])
{
[self _mergeRecord:record into:root];
}
else
{
root = record;
[root setUpload:YES];
[root setName:[[root name] lastPathComponent]];
}
}
else
{
[self createDirectory:remotePath];
root = [self recursivelyUpload:localPath
to:[remotePath stringByAppendingPathComponent:[localPath lastPathComponent]]
root:root
rootPath:remotePath
ignoreHiddenFiles:ignoreHiddenFilesFlag];
}
[self endBulkCommands];
return root;
}
- (CKTransferRecord *)resumeUploadFile:(NSString *)localPath
toFile:(NSString *)remotePath
fileOffset:(unsigned long long)offset
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)uploadFromData:(NSData *)data
toFile:(NSString *)remotePath
checkRemoteExistence:(BOOL)flag
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)resumeUploadFromData:(NSData *)data
toFile:(NSString *)remotePath
fileOffset:(unsigned long long)offset
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)downloadFile:(NSString *)remotePath
toDirectory:(NSString *)dirPath
overwrite:(BOOL)flag
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)resumeDownloadFile:(NSString *)remotePath
toDirectory:(NSString *)dirPath
fileOffset:(unsigned long long)offset
delegate:(id)delegate
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (CKTransferRecord *)recursivelyDownload:(NSString *)remotePath
to:(NSString *)localPath
overwrite:(BOOL)flag
{
SUBCLASS_RESPONSIBLE
return nil;
}
- (BOOL)isBusy
{
return NO;
}
- (unsigned)numberOfTransfers
{
return 0;
}
- (void)cancelTransfer
{
[[[CKConnectionThreadManager defaultManager] prepareWithInvocationTarget:self] threadedCancelTransfer];
}
- (void)threadedCancelTransfer
{
}
- (void)cancelAll
{
[[[CKConnectionThreadManager defaultManager] prepareWithInvocationTarget:self] threadedCancelAll];
}
- (void)threadedCancelAll
{
}
- (long long)transferSpeed
{
return 0;
}
- (double)uploadSpeed
{
return 0;
}
- (double)downloadSpeed
{
return 0;
}
- (void)directoryContents
{
}
- (void)contentsOfDirectory:(NSString *)dirPath
{
SUBCLASS_RESPONSIBLE
}
- (void)startBulkCommands
{
_inBulk = YES;
}
- (void)endBulkCommands
{
_inBulk = NO;
}
- (NSString *)rootDirectory
{
return nil;
}
- (void)checkExistenceOfPath:(NSString *)path
{
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"CKAbstractConnection does not implement checkExistanceOfPath:"
userInfo:nil];
}
- (void)editFile:(NSString *)remotePath
{
NSString *localEditable = [NSTemporaryDirectory() stringByAppendingPathComponent:[remotePath lastPathComponent]];
[_edits setObject:remotePath forKey:localEditable];
if (!_editingConnection)
{
_editingConnection = [self copy];
[_editingConnection setName:@"editing"];
[_editingConnection setDelegate:self];
[_editingConnection connect];
}
[_editingConnection downloadFile:remotePath toDirectory:[localEditable stringByDeletingLastPathComponent] overwrite:YES delegate:nil];
}
- (void)setName:(NSString *)name
{
if (name != _name)
{
[_name autorelease];
_name = [name copy];
}
}
- (NSString *)name;
{
return _name;
}
#pragma mark -
#pragma mark UKKQueue Delegate Methods
- (void)watcher:(id<UKFileWatcher>)kq receivedNotification:(NSString*)nm forPath:(NSString*)fpath
{
if ([nm isEqualToString:UKFileWatcherAttributeChangeNotification]) //UKFileWatcherWriteNotification does not get called because of atomicity of file writing (i believe)
{
KTLog(CKEditingDomain, KTLogDebug, @"File changed: %@... uploading to server", fpath);
[self uploadFile:fpath toFile:[_edits objectForKey:fpath] checkRemoteExistence:NO delegate:nil];
}
}
#pragma mark -
#pragma mark Editing Connection Delegate Methods
- (void)connection:(id <CKConnection>)con didDisconnectFromHost:(NSString *)host
{
if (con == _editingConnection)
{
[_editingConnection release];
_editingConnection = nil;
}
}
- (void)connection:(id <CKConnection>)con download:(NSString *)path progressedTo:(NSNumber *)percent
{
[[self client] download:path didProgressToPercent:percent];
}
- (void)connection:(id <CKConnection>)con download:(NSString *)path receivedDataOfLength:(unsigned long long)length
{
[[self client] download:path didReceiveDataOfLength:length];
}
- (void)connection:(id <CKConnection>)con downloadDidBegin:(NSString *)remotePath
{
[[self client] downloadDidBegin:remotePath];
}
- (void)connection:(id <CKConnection>)con downloadDidFinish:(NSString *)remotePath error:(NSError *)error
{
[[self client] downloadDidFinish:remotePath error:error];
KTLog(CKEditingDomain, KTLogDebug, @"Downloaded file %@... watching for changes", remotePath);
NSEnumerator *e = [_edits keyEnumerator];
NSString *key, *cur;
while ((key = [e nextObject]))
{
cur = [_edits objectForKey:key];
if ([cur isEqualToString:remotePath])
{
if (!_editWatcher)
{
_editWatcher = [[UKKQueue alloc] init];
[_editWatcher setDelegate:self];
}
[_editWatcher addPathToQueue:key];
KTLog(CKEditingDomain, KTLogDebug, @"Opening file for editing %@", key);
[[NSWorkspace sharedWorkspace] openFile:key];
}
}
}
- (void)connection:(id <CKConnection>)con upload:(NSString *)remotePath progressedTo:(NSNumber *)percent
{
[[self client] upload:remotePath didProgressToPercent:percent];
}
- (void)connection:(id <CKConnection>)con upload:(NSString *)remotePath sentDataOfLength:(unsigned long long)length
{
[[self client] upload:remotePath didSendDataOfLength:length];
}
- (void)connection:(id <CKConnection>)con uploadDidBegin:(NSString *)remotePath
{
[[self client] uploadDidBegin:remotePath];
}
- (void)connection:(id <CKConnection>)con uploadDidFinish:(NSString *)remotePath error:(NSError *)error
{
[[self client] uploadDidFinish:remotePath error:error];
}
- (void)connection:(id <CKConnection>)connection appendString:(NSString *)string toTranscript:(CKTranscriptType)transcript;
{
[[self client] appendString:string toTranscript:transcript];
}
@end
#pragma mark -
@implementation CKAbstractConnection (SubclassSupport)
#pragma mark -
#pragma mark Client
/* CKAbstractConnection subclasses should never communicate with their delegate directly, it's too
* tricky. Instead, send the corresponding message to the client and it will be handled appropriately.
*/
- (id <CKConnectionClient>)client
{
return _client;
}
@end
#pragma mark -
@implementation NSInvocation (AbstractConnectionExtras)
+ (NSInvocation *)invocationWithSelector:(SEL)aSelector target:(id)aTarget arguments:(NSArray *)anArgumentArray
{
NSMethodSignature *methodSignature = [aTarget methodSignatureForSelector:aSelector];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
if ( nil != invocation )
{
[invocation setSelector:aSelector];
[invocation setTarget:aTarget];
if ( (nil != anArgumentArray) && ([anArgumentArray count] > 0) )
{
NSEnumerator *e = [anArgumentArray objectEnumerator];
id argument;
int argumentIndex = 2; // arguments start at index 2 per NSInvocation.h
while ( argument = [e nextObject] )
{
if ( [argument isMemberOfClass:[NSNull class]] )
{
[invocation setArgument:nil atIndex:argumentIndex];
}
else
{
[invocation setArgument:&argument atIndex:argumentIndex];
}
argumentIndex++;
}
[invocation retainArguments];
}
}
return invocation;
}
@end
@implementation NSHost (IPV4)
- (NSString *)ipv4Address
{
NSEnumerator *e = [[self addresses] objectEnumerator];
NSString *cur;
while (cur = [e nextObject]) {
if ([cur rangeOfString:@"."].location != NSNotFound)
return cur;
}
return nil;
}
@end