/*

 * Copyright (C) 2004, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "config.h"

#import "DOMInternal.h"

#import "DOMNodeInternal.h"

#import "Frame.h"

#import "JSNode.h"

#import "WebScriptObjectPrivate.h"

#import "runtime_root.h"

//------------------------------------------------------------------------------------------

// Wrapping WebCore implementation objects

static NSMapTable* DOMWrapperCache;

NSMapTable* createWrapperCache()

{

#ifdef BUILDING_ON_TIGER

    return NSCreateMapTable(NSNonOwnedPointerMapKeyCallBacks, NSNonRetainedObjectMapValueCallBacks, 0);

#else

    // NSMapTable with zeroing weak pointers is the recommended way to build caches like this under garbage collection.

    NSPointerFunctionsOptions keyOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsOpaquePersonality;

    NSPointerFunctionsOptions valueOptions = NSPointerFunctionsZeroingWeakMemory | NSPointerFunctionsObjectPersonality;

    return [[NSMapTable alloc] initWithKeyOptions:keyOptions valueOptions:valueOptions capacity:0];

#endif

}

NSObject* getDOMWrapper(DOMObjectInternal* impl)

{

    if (!DOMWrapperCache)

        return nil;

    return static_cast<NSObject*>(NSMapGet(DOMWrapperCache, impl));

}

void addDOMWrapper(NSObject* wrapper, DOMObjectInternal* impl)

{

    if (!DOMWrapperCache)

        DOMWrapperCache = createWrapperCache();

    NSMapInsert(DOMWrapperCache, impl, wrapper);

}

void removeDOMWrapper(DOMObjectInternal* impl)

{

    if (!DOMWrapperCache)

        return;

    NSMapRemove(DOMWrapperCache, impl);

}

//------------------------------------------------------------------------------------------

@implementation WebScriptObject (WebScriptObjectInternal)

// Only called by DOMObject subclass.

- (id)_init

{

    self = [super init];

    if (![self isKindOfClass:[DOMObject class]]) {

        [NSException raise:NSGenericException format:@"+%@: _init is an internal initializer", [self class]];

        return nil;

    }

    _private = [[WebScriptObjectPrivate alloc] init];

    _private->isCreatedByDOMWrapper = YES;

    return self;

}

- (void)_initializeScriptDOMNodeImp

{

    ASSERT(_private->isCreatedByDOMWrapper);

    if (![self isKindOfClass:[DOMNode class]]) {

        // DOMObject can't map back to a document, and thus an interpreter,

        // so for now only create wrappers for DOMNodes.

        NSLog(@"%s:%d:  We don't know how to create ObjC JS wrappers from DOMObjects yet.", __FILE__, __LINE__);

        return;

    }

    // Extract the WebCore::Node from the ObjectiveC wrapper.

    DOMNode *n = (DOMNode *)self;

    WebCore::Node *nodeImpl = core(n);

    // Dig up Interpreter and ExecState.

    WebCore::Frame *frame = 0;

    if (WebCore::Document* document = nodeImpl->document())

        frame = document->frame();

    if (!frame)

        return;

    // The global object which should own this node - FIXME: does this need to be isolated-world aware?

    WebCore::JSDOMGlobalObject* globalObject = frame->script()->globalObject(WebCore::mainThreadNormalWorld());

    JSC::ExecState *exec = globalObject->globalExec();

    // Get (or create) a cached JS object for the DOM node.

    JSC::JSObject *scriptImp = asObject(WebCore::toJS(exec, globalObject, nodeImpl));

    JSC::Bindings::RootObject* rootObject = frame->script()->bindingRootObject();

    [self _setImp:scriptImp originRootObject:rootObject rootObject:rootObject];

}

@end