1/* 2 * Copyright (C) 2007 Apple Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef COMEnumVariant_h 27#define COMEnumVariant_h 28 29#ifndef NOMINMAX 30#define NOMINMAX 31#endif 32#include <unknwn.h> 33 34 35#include "COMVariantSetter.h" 36 37template<typename ContainerType> 38class COMEnumVariant : public IEnumVARIANT { 39 WTF_MAKE_NONCOPYABLE(COMEnumVariant); 40public: 41 static COMEnumVariant* adopt(ContainerType&); 42 static COMEnumVariant* createInstance(const ContainerType&); 43 44 // IUnknown 45 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppvObject); 46 virtual ULONG STDMETHODCALLTYPE AddRef(); 47 virtual ULONG STDMETHODCALLTYPE Release(); 48 49 // IEnumVARIANT 50 virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt, VARIANT* rgVar, ULONG* pCeltFetched); 51 virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt); 52 virtual HRESULT STDMETHODCALLTYPE Reset(); 53 virtual HRESULT STDMETHODCALLTYPE Clone(IEnumVARIANT** ppEnum); 54 55private: 56 COMEnumVariant() 57 : m_refCount(0) 58 { 59 } 60 61 COMEnumVariant(const ContainerType& container) 62 : m_refCount(0) 63 , m_container(container) 64 , m_currentPos(m_container.begin()) 65 { 66 } 67 68 ~COMEnumVariant() {} 69 70 ULONG m_refCount; 71 72 ContainerType m_container; 73 typename ContainerType::const_iterator m_currentPos; 74}; 75 76// COMEnumVariant ------------------------------------------------------------------ 77template<typename ContainerType> 78COMEnumVariant<typename ContainerType>* COMEnumVariant<ContainerType>::adopt(ContainerType& container) 79{ 80 COMEnumVariant* instance = new COMEnumVariant; 81 instance->m_container.swap(container); 82 instance->m_currentPos = instance->m_container.begin(); 83 instance->AddRef(); 84 return instance; 85} 86 87template<typename ContainerType> 88COMEnumVariant<typename ContainerType>* COMEnumVariant<ContainerType>::createInstance(const ContainerType& container) 89{ 90 COMEnumVariant* instance = new COMEnumVariant(container); 91 instance->AddRef(); 92 return instance; 93} 94 95// IUnknown ------------------------------------------------------------------------ 96template<typename ContainerType> 97HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::QueryInterface(REFIID riid, void** ppvObject) 98{ 99 *ppvObject = 0; 100 if (IsEqualGUID(riid, IID_IUnknown)) 101 *ppvObject = static_cast<COMEnumVariant*>(this); 102 else if (IsEqualGUID(riid, IID_IEnumVARIANT)) 103 *ppvObject = static_cast<COMEnumVariant*>(this); 104 else 105 return E_NOINTERFACE; 106 107 AddRef(); 108 return S_OK; 109} 110 111template<typename ContainerType> 112ULONG STDMETHODCALLTYPE COMEnumVariant<ContainerType>::AddRef() 113{ 114 return ++m_refCount; 115} 116 117template<typename ContainerType> 118ULONG STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Release() 119{ 120 ULONG newRef = --m_refCount; 121 if (!newRef) 122 delete this; 123 124 return newRef; 125} 126 127// IEnumVARIANT -------------------------------------------------------------------- 128template<typename ContainerType> 129HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Next(ULONG celt, VARIANT* rgVar, ULONG* pCeltFetched) 130{ 131 if (pCeltFetched) 132 *pCeltFetched = 0; 133 if (!rgVar) 134 return E_POINTER; 135 for (unsigned i = 0 ; i < celt; i++) 136 VariantInit(&rgVar[i]); 137 138 for (unsigned i = 0; i < celt; i++) { 139 if (m_currentPos == m_container.end()) 140 return S_FALSE; 141 142 COMVariantSetter<ContainerType::ValueType>::setVariant(&rgVar[i], *m_currentPos); 143 ++m_currentPos; 144 if (pCeltFetched) 145 (*pCeltFetched)++; 146 } 147 148 return S_OK; 149} 150 151template<typename ContainerType> 152HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Skip(ULONG celt) 153{ 154 for (unsigned i = 0; i < celt; i++) { 155 if (m_currentPos == m_container.end()) 156 return S_FALSE; 157 158 ++m_currentPos; 159 } 160 return S_OK; 161} 162 163template<typename ContainerType> 164HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Reset() 165{ 166 m_currentPos = m_container.begin(); 167 return S_OK; 168} 169 170template<typename ContainerType> 171HRESULT STDMETHODCALLTYPE COMEnumVariant<ContainerType>::Clone(IEnumVARIANT** ppEnum) 172{ 173 if (!ppEnum) 174 return E_POINTER; 175 176 *ppEnum = 0; 177 return E_NOTIMPL; 178} 179 180#endif 181