/*

 * Copyright (C) 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. 

 */

#include "config.h"

#include "IdentifierRep.h"

#include "JSDOMBinding.h"

#include "PlatformString.h"

#include <runtime/UString.h>

#include <wtf/HashMap.h>

#include <wtf/StdLibExtras.h>

using namespace JSC;

namespace WebCore {

typedef HashSet<IdentifierRep*> IdentifierSet;

static IdentifierSet& identifierSet()

{

    DEFINE_STATIC_LOCAL(IdentifierSet, identifierSet, ());

    return identifierSet;

}

typedef HashMap<int, IdentifierRep*> IntIdentifierMap;

static IntIdentifierMap& intIdentifierMap()

{

    DEFINE_STATIC_LOCAL(IntIdentifierMap, intIdentifierMap, ());

    return intIdentifierMap;

}

IdentifierRep* IdentifierRep::get(int intID)

{

    if (intID == 0 || intID == -1) {

        static IdentifierRep* negativeOneAndZeroIdentifiers[2];

        IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1];

        if (!identifier) {

            identifier = new IdentifierRep(intID);

            negativeOneAndZeroIdentifiers[intID + 1] = identifier;

        }

        return identifier;

    }

    pair<IntIdentifierMap::iterator, bool> result = intIdentifierMap().add(intID, 0); 

    if (result.second) {

        ASSERT(!result.first->second);

        result.first->second = new IdentifierRep(intID);

        identifierSet().add(result.first->second);

    }

    return result.first->second;

}

typedef HashMap<RefPtr<JSC::UString::Rep>, IdentifierRep*> StringIdentifierMap;

static StringIdentifierMap& stringIdentifierMap()

{

    DEFINE_STATIC_LOCAL(StringIdentifierMap, stringIdentifierMap, ());

    return stringIdentifierMap;

}

IdentifierRep* IdentifierRep::get(const char* name)

{

    ASSERT(name);

    if (!name)

        return 0;

    UString string = stringToUString(String::fromUTF8WithLatin1Fallback(name, strlen(name)));

    pair<StringIdentifierMap::iterator, bool> result = stringIdentifierMap().add(string.rep(), 0);

    if (result.second) {

        ASSERT(!result.first->second);

        result.first->second = new IdentifierRep(name);

        identifierSet().add(result.first->second);

    }

    return result.first->second;

}

bool IdentifierRep::isValid(IdentifierRep* identifier)

{

    return identifierSet().contains(identifier);

}

} // namespace WebCore