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//
// Lynkeos
// $Id$
//
// Created by Jean-Etienne LAMIAUD on Thu Sep 14 2006.
// Copyright (c) 2006-2018. Jean-Etienne LAMIAUD
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#include <errno.h>
#include <objc/runtime.h>
#include "LynkeosThreadConnection.h"
#include "LynkeosProcessingParameterMgr.h"
// These notification keys are defined here to avoid a dependency on MyDocument
NSString * const LynkeosItemChangedNotification = @"LynkeosItemChanged";
NSString * const LynkeosUserInfoItem = @"item";
//! Global lock to protect dictionary and rw lock creation
static NSLock *paramLock = nil;
@implementation LynkeosProcessingParameterMgr
+ (void) initialize
{
paramLock = [[NSLock alloc] init];
}
- (id) init
{
if ( (self = [super init]) != nil )
{
_parent = nil;
_document = nil;
_parametersDict = nil;
_mainThread = [NSThread currentThread];
}
return( self );
}
- (id) initWithParent: (LynkeosProcessingParameterMgr*)parent
{
if ( (self = [self init]) != nil )
_parent = [parent retain];
return( self );
}
- (id) initWithDocument: (NSDocument <LynkeosDocument> *)document
{
if ( (self = [self init]) != nil )
_document = document; // No retain, because we are agregated to the doc
return( self );
}
- (void) dealloc
{
if ( _parent != nil )
[_parent release];
if ( _parametersDict != nil )
{
[_parametersDict release];
_parametersDict = nil;
pthread_rwlock_destroy( &_lock );
}
[super dealloc];
}
- (NSDictionary*) getDictionary { return( _parametersDict ); }
- (void) setDictionary:(NSDictionary*)dict
{
int err;
if ( _parametersDict == nil && dict != nil )
{
[paramLock lock];
err = pthread_rwlock_init( &_lock, NULL );
[paramLock unlock];
NSAssert1( err == 0, @"Failed to create the parameters RW lock : %s",
strerror(errno) );
}
if ( _parametersDict != nil )
{
[_parametersDict release];
_parametersDict = nil;
}
if ( dict != nil )
_parametersDict =
[[NSMutableDictionary dictionaryWithDictionary:dict] retain];
}
- (oneway void) notifyItemModification:(id)item
{
// Always notify in the main thread
if ( [NSThread currentThread] != _mainThread )
{
NSObject* target = (_parent != nil ? _parent : self);
[LynkeosThreadConnection performSelectorOnMainThread:
@selector(notifyItemModification:)
forObject:target
withArg:item];
}
else
{
if ( _parent != nil )
// Propagate up the chain
[_parent notifyItemModification:item];
else
{
// We are at the top : notify of the change
[[NSNotificationCenter defaultCenter] postNotificationName: LynkeosItemChangedNotification
object: _document
userInfo:
[NSDictionary dictionaryWithObject:item
forKey:LynkeosUserInfoItem]];
// To be deleted when all notifiers will implement undo
if ( ![[_document undoManager] isUndoing]
&& ![_document isDocumentEdited] )
[_document updateChangeCount:NSChangeDone];
}
}
}
- (id <LynkeosProcessingParameter>) getProcessingParameterWithRef:(NSString*)ref
forProcessing:(NSString*)processing
goUp:(BOOL)goUp
{
int err;
id param = nil;
if ( _parametersDict != nil )
{
// Nil is not authorized as an NSDictionary key
NSString *processKey =
(processing == nil ? @"LynkeosNilProcess" : processing);
// Get exclusive read access
err = pthread_rwlock_rdlock( &_lock );
NSAssert1( err == 0, @"Failed to lock the parameters for reading : %s",
strerror(errno) );
NSDictionary *processDict = [_parametersDict objectForKey:processKey];
if ( processDict != nil )
param = [processDict objectForKey:ref];
err = pthread_rwlock_unlock( &_lock );
NSAssert1( err == 0, @"Failed to unlock the parameters : %s",
strerror(errno) );
}
// Forward search to container if needed
if ( param == nil && _parent != nil && goUp )
param = [_parent getProcessingParameterWithRef:ref
forProcessing:processing goUp:YES];
return( param );
}
- (void) setProcessingParameter:(id <LynkeosProcessingParameter>)parameter
withRef:(NSString*)ref
forProcessing:(NSString*)processing
{
int err;
if ( _parametersDict == nil )
{
[paramLock lock];
err = pthread_rwlock_init( &_lock, NULL );
if ( err == 0 )
_parametersDict = [[NSMutableDictionary dictionary] retain];
[paramLock unlock];
NSAssert1( err == 0, @"Failed to create the parameters RW lock : %s",
strerror(errno) );
}
// Nil is not authorized as an NSDictionary key
NSString *processKey = (processing == nil ? @"LynkeosNilProcess" : processing);
// Get exclusive write access
err = pthread_rwlock_wrlock( &_lock );
NSAssert1( err == 0, @"Failed to lock the parameters for writing : %s",
strerror(errno) );
NSMutableDictionary *processDict = [_parametersDict objectForKey:processKey];
if ( processDict == nil )
{
// Create a fresh one
processDict = [NSMutableDictionary dictionary];
[_parametersDict setObject:processDict forKey:processKey];
}
// setValue will delete the entry if parameter is nil,
// if the entry already exists, the parameter replaces the previous one.
[processDict setValue:parameter forKey:ref];
err = pthread_rwlock_unlock( &_lock );
NSAssert1( err == 0, @"Failed to unlock the parameters : %s",
strerror(errno) );
}
@end
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