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/*
* Copyright (C) 2007, 2008 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. ``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
* 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 COMVariantSetter_h
#define COMVariantSetter_h
#include <WebCore/BString.h>
#include <WebCore/COMPtr.h>
#include <wtf/Assertions.h>
#include <wtf/Forward.h>
template<typename T> struct COMVariantSetter {};
template<typename T> struct COMVariantSetterBase
{
static inline VARENUM variantType(const T&)
{
return COMVariantSetter<T>::VariantType;
}
};
template<> struct COMVariantSetter<WTF::String> : COMVariantSetterBase<WTF::String>
{
static const VARENUM VariantType = VT_BSTR;
static void setVariant(VARIANT* variant, const WTF::String& value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_BSTR(variant) = WebCore::BString(value).release();
}
};
template<> struct COMVariantSetter<bool> : COMVariantSetterBase<bool>
{
static const VARENUM VariantType = VT_BOOL;
static void setVariant(VARIANT* variant, bool value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_BOOL(variant) = value;
}
};
template<> struct COMVariantSetter<unsigned long long> : COMVariantSetterBase<unsigned long long>
{
static const VARENUM VariantType = VT_UI8;
static void setVariant(VARIANT* variant, unsigned long long value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_UI8(variant) = value;
}
};
template<> struct COMVariantSetter<int> : COMVariantSetterBase<int>
{
static const VARENUM VariantType = VT_I4;
static void setVariant(VARIANT* variant, int value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_I4(variant) = value;
}
};
template<> struct COMVariantSetter<float> : COMVariantSetterBase<float>
{
static const VARENUM VariantType = VT_R4;
static void setVariant(VARIANT* variant, float value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_R4(variant) = value;
}
};
template<typename T> struct COMVariantSetter<COMPtr<T> > : COMVariantSetterBase<COMPtr<T> >
{
static const VARENUM VariantType = VT_UNKNOWN;
static void setVariant(VARIANT* variant, const COMPtr<T>& value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_UNKNOWN(variant) = value.get();
value->AddRef();
}
};
template<typename COMType, typename UnderlyingType>
struct COMIUnknownVariantSetter : COMVariantSetterBase<UnderlyingType>
{
static const VARENUM VariantType = VT_UNKNOWN;
static void setVariant(VARIANT* variant, const UnderlyingType& value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
V_VT(variant) = VariantType;
V_UNKNOWN(variant) = COMType::createInstance(value);
}
};
class COMVariant {
public:
COMVariant()
{
::VariantInit(&m_variant);
}
template<typename UnderlyingType>
COMVariant(UnderlyingType value)
{
::VariantInit(&m_variant);
COMVariantSetter<UnderlyingType>::setVariant(&m_variant, value);
}
~COMVariant()
{
::VariantClear(&m_variant);
}
COMVariant(const COMVariant& other)
{
::VariantInit(&m_variant);
other.copyTo(&m_variant);
}
COMVariant& operator=(const COMVariant& other)
{
other.copyTo(&m_variant);
return *this;
}
void copyTo(VARIANT* dest) const
{
::VariantCopy(dest, const_cast<VARIANT*>(&m_variant));
}
VARENUM variantType() const { return static_cast<VARENUM>(V_VT(&m_variant)); }
private:
VARIANT m_variant;
};
template<> struct COMVariantSetter<COMVariant>
{
static inline VARENUM variantType(const COMVariant& value)
{
return value.variantType();
}
static void setVariant(VARIANT* variant, const COMVariant& value)
{
ASSERT(V_VT(variant) == VT_EMPTY);
value.copyTo(variant);
}
};
#endif // COMVariantSetter
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