/*
 * Copyright (C) 2014 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "_WKScriptWorld.h"

#if WK_API_ENABLED

@implementation _WKScriptWorld {
    uint64_t _worldID;
}

static uint64_t generateWorldID()
{
    std::atomic<uint64_t> worldID;

    return ++worldID;
}

+ (instancetype)defaultWorld
{
    static dispatch_once_t onceToken;
    static _WKScriptWorld *defaultWorld;

    dispatch_once(&onceToken, ^{
        defaultWorld = [[_WKScriptWorld alloc] _initWithWorldID:0];
    });

    return defaultWorld;
}

- (instancetype)init
{
    return [self _initWithWorldID:generateWorldID()];
}

- (instancetype)_initWithWorldID:(uint64_t)worldID
{
    if (!(self = [super init]))
        return nil;

    _worldID = worldID;
    return self;
}

@end

#endif