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/*
* Copyright (C) 2007 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 COMEnumVariant_h
#define COMEnumVariant_h
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <unknwn.h>
#include "COMVariantSetter.h"
template<typename ContainerType>
class COMEnumVariant : public IEnumVARIANT {
WTF_MAKE_NONCOPYABLE(COMEnumVariant);
public:
static COMEnumVariant* adopt(ContainerType&);
static COMEnumVariant* createInstance(const ContainerType&);
// IUnknown
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef();
virtual ULONG STDMETHODCALLTYPE Release();
// IEnumVARIANT
virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt, VARIANT* rgVar, ULONG* pCeltFetched);
virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt);
virtual HRESULT STDMETHODCALLTYPE Reset();
virtual HRESULT STDMETHODCALLTYPE Clone(IEnumVARIANT** ppEnum);
private:
COMEnumVariant()
: m_refCount(0)
{
}
COMEnumVariant(const ContainerType& container)
: m_refCount(0)
, m_container(container)
, m_currentPos(m_container.begin())
{
}
~COMEnumVariant() {}
ULONG m_refCount;
ContainerType m_container;
typename ContainerType::const_iterator m_currentPos;
};
// COMEnumVariant ------------------------------------------------------------------
template<typename ContainerType>
COMEnumVariant<typename ContainerType>* COMEnumVariant<ContainerType>::adopt(ContainerType& container)
{
COMEnumVariant* instance = new COMEnumVariant;
instance->m_container.swap(container);
instance->m_currentPos = instance->m_container.begin();
instance->AddRef();
return instance;
}
template<typename ContainerType>
COMEnumVariant<typename ContainerType>* COMEnumVariant<ContainerType>::createInstance(const ContainerType& container)
{
COMEnumVariant* instance = new COMEnumVariant(container);
instance->AddRef();
return instance;
}
// IUnknown ------------------------------------------------------------------------
template<typename ContainerType>
HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::QueryInterface(REFIID riid, void** ppvObject)
{
*ppvObject = 0;
if (IsEqualGUID(riid, IID_IUnknown))
*ppvObject = static_cast<COMEnumVariant*>(this);
else if (IsEqualGUID(riid, IID_IEnumVARIANT))
*ppvObject = static_cast<COMEnumVariant*>(this);
else
return E_NOINTERFACE;
AddRef();
return S_OK;
}
template<typename ContainerType>
ULONG STDMETHODCALLTYPE COMEnumVariant<ContainerType>::AddRef()
{
return ++m_refCount;
}
template<typename ContainerType>
ULONG STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Release()
{
ULONG newRef = --m_refCount;
if (!newRef)
delete this;
return newRef;
}
// IEnumVARIANT --------------------------------------------------------------------
template<typename ContainerType>
HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Next(ULONG celt, VARIANT* rgVar, ULONG* pCeltFetched)
{
if (pCeltFetched)
*pCeltFetched = 0;
if (!rgVar)
return E_POINTER;
for (unsigned i = 0 ; i < celt; i++)
VariantInit(&rgVar[i]);
for (unsigned i = 0; i < celt; i++) {
if (m_currentPos == m_container.end())
return S_FALSE;
COMVariantSetter<ContainerType::ValueType>::setVariant(&rgVar[i], *m_currentPos);
++m_currentPos;
if (pCeltFetched)
(*pCeltFetched)++;
}
return S_OK;
}
template<typename ContainerType>
HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Skip(ULONG celt)
{
for (unsigned i = 0; i < celt; i++) {
if (m_currentPos == m_container.end())
return S_FALSE;
++m_currentPos;
}
return S_OK;
}
template<typename ContainerType>
HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Reset()
{
m_currentPos = m_container.begin();
return S_OK;
}
template<typename ContainerType>
HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Clone(IEnumVARIANT** ppEnum)
{
if (!ppEnum)
return E_POINTER;
*ppEnum = 0;
return E_NOTIMPL;
}
#endif
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