201 lines
6.5 KiB
Objective-C
201 lines
6.5 KiB
Objective-C
/* =============================================================================
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FILE: UKFNSubscribeFileWatcher.m
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PROJECT: Filie
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COPYRIGHT: (c) 2005 M. Uli Kusterer, all rights reserved.
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AUTHORS: M. Uli Kusterer - UK
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LICENSES: MIT License
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REVISIONS:
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2006-03-13 UK Commented, added singleton, added notifications.
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2005-03-02 UK Created.
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========================================================================== */
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// -----------------------------------------------------------------------------
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// Headers:
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// -----------------------------------------------------------------------------
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#import "UKFNSubscribeFileWatcher.h"
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#import <Carbon/Carbon.h>
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// -----------------------------------------------------------------------------
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// Prototypes:
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// -----------------------------------------------------------------------------
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void UKFileSubscriptionProc(FNMessage message, OptionBits flags, void *refcon, FNSubscriptionRef subscription);
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@implementation UKFNSubscribeFileWatcher
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// -----------------------------------------------------------------------------
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// sharedFileWatcher:
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// Singleton accessor.
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// -----------------------------------------------------------------------------
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+(id) sharedFileWatcher
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{
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static UKFNSubscribeFileWatcher* sSharedFileWatcher = nil;
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if( !sSharedFileWatcher )
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sSharedFileWatcher = [[UKFNSubscribeFileWatcher alloc] init]; // This is a singleton, and thus an intentional "leak".
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return sSharedFileWatcher;
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}
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// -----------------------------------------------------------------------------
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// * CONSTRUCTOR:
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// -----------------------------------------------------------------------------
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-(id) init
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{
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self = [super init];
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if( !self )
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return nil;
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subscriptions = [[NSMutableDictionary alloc] init];
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return self;
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}
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// -----------------------------------------------------------------------------
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// * DESTRUCTOR:
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// -----------------------------------------------------------------------------
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-(void) dealloc
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{
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NSEnumerator* enny = [subscriptions objectEnumerator];
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NSValue* subValue = nil;
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while( (subValue = [enny nextObject]) )
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{
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FNSubscriptionRef subscription = [subValue pointerValue];
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FNUnsubscribe( subscription );
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}
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[subscriptions release];
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[super dealloc];
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}
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// -----------------------------------------------------------------------------
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// addPath:
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// Start watching the object at the specified path. This only sends write
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// notifications for all changes, as FNSubscribe doesn't tell what actually
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// changed about our folder.
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// -----------------------------------------------------------------------------
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-(void) addPath: (NSString*)path
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{
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OSStatus err = noErr;
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static FNSubscriptionUPP subscriptionUPP = NULL;
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FNSubscriptionRef subscription = NULL;
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if( !subscriptionUPP )
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subscriptionUPP = NewFNSubscriptionUPP( UKFileSubscriptionProc );
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err = FNSubscribeByPath( (UInt8*) [path fileSystemRepresentation], subscriptionUPP, (void*)self,
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kNilOptions, &subscription );
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if( err != noErr )
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{
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NSLog( @"UKFNSubscribeFileWatcher addPath: %@ failed due to error ID=%ld.", path, err );
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return;
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}
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[subscriptions setObject: [NSValue valueWithPointer: subscription] forKey: path];
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}
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// -----------------------------------------------------------------------------
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// removePath:
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// Stop watching the object at the specified path.
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// -----------------------------------------------------------------------------
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-(void) removePath: (NSString*)path
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{
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NSValue* subValue = nil;
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@synchronized( self )
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{
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subValue = [[[subscriptions objectForKey: path] retain] autorelease];
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[subscriptions removeObjectForKey: path];
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}
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if( subValue )
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{
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FNSubscriptionRef subscription = [subValue pointerValue];
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FNUnsubscribe( subscription );
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}
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}
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// -----------------------------------------------------------------------------
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// sendDelegateMessage:forSubscription:
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// Bottleneck for change notifications. This is called by our callback
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// function to actually inform the delegate and send out notifications.
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//
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// This *only* sends out write notifications, as FNSubscribe doesn't tell
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// what changed about our folder.
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// -----------------------------------------------------------------------------
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-(void) sendDelegateMessage: (FNMessage)message forSubscription: (FNSubscriptionRef)subscription
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{
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NSValue* subValue = [NSValue valueWithPointer: subscription];
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NSString* path = [[subscriptions allKeysForObject: subValue] objectAtIndex: 0];
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[[[NSWorkspace sharedWorkspace] notificationCenter] postNotificationName: UKFileWatcherWriteNotification
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object: self
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userInfo: [NSDictionary dictionaryWithObjectsAndKeys: path, @"path", nil]];
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[delegate watcher: self receivedNotification: UKFileWatcherWriteNotification forPath: path];
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//NSLog( @"UKFNSubscribeFileWatcher noticed change to %@", path ); // DEBUG ONLY!
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}
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// -----------------------------------------------------------------------------
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// delegate:
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// Accessor for file watcher delegate.
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// -----------------------------------------------------------------------------
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-(id) delegate
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{
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return delegate;
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}
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// -----------------------------------------------------------------------------
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// setDelegate:
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// Mutator for file watcher delegate.
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// -----------------------------------------------------------------------------
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-(void) setDelegate: (id)newDelegate
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{
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delegate = newDelegate;
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}
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@end
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// -----------------------------------------------------------------------------
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// UKFileSubscriptionProc:
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// Callback function we hand to Carbon so it can tell us when something
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// changed about our watched folders. We set the refcon to a pointer to
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// our object. This simply extracts the object and hands the info off to
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// sendDelegateMessage:forSubscription: which does the actual work.
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// -----------------------------------------------------------------------------
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void UKFileSubscriptionProc( FNMessage message, OptionBits flags, void *refcon, FNSubscriptionRef subscription )
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{
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UKFNSubscribeFileWatcher* obj = (UKFNSubscribeFileWatcher*) refcon;
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if( message == kFNDirectoryModifiedMessage ) // No others exist as of 10.4
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[obj sendDelegateMessage: message forSubscription: subscription];
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else
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NSLog( @"UKFileSubscriptionProc: Unknown message %d", message );
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} |