libs-gui/Tools/speech/GSSpeechSynthesizer.m

#import "GSSpeechSynthesizer.h"

static GSSpeechServer *server;
static int clients;

@implementation GSSpeechSynthesizer
+ (void)initialize
{
	server = [[GSSpeechServer sharedServer] retain];
	[[NSNotificationCenter defaultCenter]
		addObserver: self
		   selector: @selector(connectionDied:)
			   name: NSConnectionDidDieNotification
			 object: nil];

}
/**
 * If the remote end exits before freeing the GSSpeechSynthesizer then we need
 * to send it a -release message to make sure it dies.
 */
+ (void)connectionDied: (NSNotification*)aNotification
{
	NSEnumerator *e = [[[aNotification object] localObjects] objectEnumerator];
	for (NSObject *o = [e nextObject] ; nil != o ; o = [e nextObject])
	{
		if ([o isKindOfClass: self])
		{
			[o release];
		}
	}
}
/**
 * If no clients have been active for some time, kill the speech server to
 * conserve resources.
 */
- (void)exitIfUnneeded: (NSTimer*)sender
{
	if (clients == 0)
	{
		exit(0);
	}
}
- (id)initWithVoice: (NSString*)aVoice
{
	clients++;
	if (nil == (self = [super init])) { return nil; }
	[self setVoice: currentVoice];
	return self;
}
- (id)init
{
	return [self initWithVoice: nil];
}
- (NSString*)voice
{
	return currentVoice;
}
- (id)delegate
{
	return delegate;
}
- (void)setDelegate: (id)aDelegate
{
	// Either -retain or -release can throw an exception due to DO.
	NS_DURING
		aDelegate = [aDelegate retain];
	NS_HANDLER
	NS_ENDHANDLER
	NS_DURING
		[delegate release];
	NS_HANDLER
	NS_ENDHANDLER
	delegate = aDelegate;
}
- (void)setVoice: (NSString*)aVoice
{
	if (nil == aVoice)
	{
		aVoice = [server defaultVoice];
	}
	ASSIGN(currentVoice, aVoice);
}
- (BOOL)startSpeakingString: (NSString*)aString
{
	[server setVoice: currentVoice];
	return [server startSpeakingString: aString notifyWhenDone: self];
}
- (void)didFinishSpeaking: (BOOL)didFinish
{
	// Throw the delegate away if it is throwing exceptions during
	// notification.
	NS_DURING
		[delegate speechSynthesizer: self didFinishSpeaking: didFinish];
	NS_HANDLER
		NS_DURING
		id d = delegate;
		delegate = nil;
		[d release];
		NS_HANDLER
		NS_ENDHANDLER
	NS_ENDHANDLER
}
- (void)stopSpeaking
{
	[server stopSpeaking];
}
- (void)dealloc
{
	clients--;
	[currentVoice release];
	if (clients == 0)
	{
		[NSTimer scheduledTimerWithTimeInterval: 600
										  target: isa
										selector: @selector(exitIfUnneeded:)
										userInfo: nil
										 repeats: NO];
	}
	[super dealloc];
}
@end