OOJSPopulatorDefinition.m

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/*
 
OOJSPopulatorDefinition.m
 
 
Oolite
Copyright (C) 2004-2013 Giles C Williams and contributors
 
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
 
*/
 
#import "OOJSPopulatorDefinition.h"
#import "OOJavaScriptEngine.h"
#import "OOMaths.h"
#import "OOJSVector.h"
 
@implementation OOJSPopulatorDefinition
 
- (id) init {
    self = [super init];
    _callback = JSVAL_VOID;
    _callbackThis = NULL;
 
    _owningScript = [[OOJSScript currentlyRunningScript] weakRetain];
 
    [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(deleteJSPointers)
                                                 name:kOOJavaScriptEngineWillResetNotification
                                               object:[OOJavaScriptEngine sharedEngine]];
 
    return self;
}
 
- (void) deleteJSPointers
{
 
    JSContext               *context = OOJSAcquireContext();
    _callback = JSVAL_VOID;
    _callbackThis = NULL;
    JS_RemoveValueRoot(context, &_callback);
    JS_RemoveObjectRoot(context, &_callbackThis);
 
    OOJSRelinquishContext(context);
 
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:kOOJavaScriptEngineWillResetNotification
                                                  object:[OOJavaScriptEngine sharedEngine]];
 
}
 
- (void) dealloc 
{
    [_owningScript release];
 
    [self deleteJSPointers];
 
    [super dealloc];
}
 
- (jsval)callback
{
    return _callback;
}
 
 
- (void)setCallback:(jsval)callback
{
    JSContext               *context = OOJSAcquireContext();
    JS_RemoveValueRoot(context, &_callback);
    _callback = callback;
    OOJSAddGCValueRoot(context, &_callback, "OOJSPopulatorDefinition callback function");
    OOJSRelinquishContext(context);
}
 
 
- (JSObject *)callbackThis
{
    return _callbackThis;
}
 
 
- (void)setCallbackThis:(JSObject *)callbackThis
{
    JSContext               *context = OOJSAcquireContext();
    JS_RemoveObjectRoot(context, &_callbackThis);
    _callbackThis = callbackThis;
    OOJSAddGCObjectRoot(context, &_callbackThis, "OOJSPopulatorDefinition callback this");
    OOJSRelinquishContext(context);
}
 
 
- (void)runCallback:(HPVector)location
{
    OOJavaScriptEngine *engine = [OOJavaScriptEngine sharedEngine];
    JSContext           *context = OOJSAcquireContext();        
    jsval                   loc, rval = JSVAL_VOID;
 
    VectorToJSValue(context, HPVectorToVector(location), &loc);
 
    OOJSScript *owner = [_owningScript retain]; // local copy needed
    [OOJSScript pushScript:owner];
 
    [engine callJSFunction:_callback
                 forObject:_callbackThis
                      argc:1
                      argv:&loc
                    result:&rval];
    
    [OOJSScript popScript:owner];
    [owner release];
 
    OOJSRelinquishContext(context);
}
 
@end