/*

 * Copyright (C) 2009, 2010 Google 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:

 *

 *     * Redistributions of source code must retain the above copyright

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

 *     * 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.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT

 * OWNER 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.

 */

#ifndef CrossThreadCopier_h

#define CrossThreadCopier_h

#include <wtf/PassOwnPtr.h>

#include <wtf/PassRefPtr.h>

#include <wtf/RefPtr.h>

#include <wtf/Threading.h>

#include <wtf/TypeTraits.h>

namespace WebCore {

    class KURL;

    class ResourceError;

    class ResourceRequest;

    class ResourceResponse;

    class String;

    struct CrossThreadResourceResponseData;

    struct CrossThreadResourceRequestData;

    struct ThreadableLoaderOptions;

    template<typename T> struct CrossThreadCopierPassThrough {

        typedef T Type;

        static Type copy(const T& parameter)

        {

            return parameter;

        }

    };

    template<bool isConvertibleToInteger, bool isThreadsafeShared, typename T> struct CrossThreadCopierBase;

    // Integers get passed through without any changes.

    template<typename T> struct CrossThreadCopierBase<true, false, T> : public CrossThreadCopierPassThrough<T> {

    };

    // Pointers get passed through without any significant changes.

    template<typename T> struct CrossThreadCopierBase<false, false, T*> : public CrossThreadCopierPassThrough<T*> {

    };

    template<> struct CrossThreadCopierBase<false, false, ThreadableLoaderOptions> : public CrossThreadCopierPassThrough<ThreadableLoaderOptions> {

    };

    // Custom copy methods.

    template<typename T> struct CrossThreadCopierBase<false, true, T> {

        typedef typename WTF::RemoveTemplate<T, RefPtr>::Type RefCountedType;

        typedef PassRefPtr<RefCountedType> Type;

        static Type copy(const T& refPtr)

        {

            return refPtr.get();

        }

    };

    template<typename T> struct CrossThreadCopierBase<false, false, PassOwnPtr<T> > {

        typedef PassOwnPtr<T> Type;

        static Type copy(Type ownPtr)

        {

            return ownPtr;

        }

    };

    template<> struct CrossThreadCopierBase<false, false, KURL> {

        typedef KURL Type;

        static Type copy(const KURL&);

    };

    template<> struct CrossThreadCopierBase<false, false, String> {

        typedef String Type;

        static Type copy(const String&);

    };

    template<> struct CrossThreadCopierBase<false, false, ResourceError> {

        typedef ResourceError Type;

        static Type copy(const ResourceError&);

    };

    template<> struct CrossThreadCopierBase<false, false, ResourceRequest> {

        typedef PassOwnPtr<CrossThreadResourceRequestData> Type;

        static Type copy(const ResourceRequest&);

    };

    template<> struct CrossThreadCopierBase<false, false, ResourceResponse> {

        typedef PassOwnPtr<CrossThreadResourceResponseData> Type;

        static Type copy(const ResourceResponse&);

    };

    template<typename T> struct CrossThreadCopier : public CrossThreadCopierBase<WTF::IsConvertibleToInteger<T>::value,

                                                                                 WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, RefPtr>::Type, ThreadSafeShared>::value,

                                                                                 T> {

    };

} // namespace WebCore

#endif // CrossThreadCopier_h