1 /*

     2  * Copyright (C) 2007, 2008 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 COMVariantSetter_h

    27 #define COMVariantSetter_h

    28 

    29 #include <WebCore/BString.h>

    30 #include <WebCore/COMPtr.h>

    31 #include <wtf/Assertions.h>

    32 

    33 namespace WebCore {

    34     class String;

    35 }

    36 

    37 template<typename T> struct COMVariantSetter {};

    38 

    39 template<typename T> struct COMVariantSetterBase

    40 {

    41     static inline VARENUM variantType(const T&)

    42     {

    43         return COMVariantSetter<T>::VariantType;

    44     }

    45 };

    46 

    47 template<> struct COMVariantSetter<WebCore::String> : COMVariantSetterBase<WebCore::String>

    48 {

    49     static const VARENUM VariantType = VT_BSTR;

    50 

    51     static void setVariant(VARIANT* variant, const WebCore::String& value)

    52     {

    53         ASSERT(V_VT(variant) == VT_EMPTY);

    54 

    55         V_VT(variant) = VariantType;

    56         V_BSTR(variant) = WebCore::BString(value).release();

    57     }

    58 };

    59 

    60 template<> struct COMVariantSetter<bool> : COMVariantSetterBase<bool>

    61 {

    62     static const VARENUM VariantType = VT_BOOL;

    63 

    64     static void setVariant(VARIANT* variant, bool value)

    65     {

    66         ASSERT(V_VT(variant) == VT_EMPTY);

    67 

    68         V_VT(variant) = VariantType;

    69         V_BOOL(variant) = value;

    70     }

    71 };

    72 

    73 template<> struct COMVariantSetter<unsigned long long> : COMVariantSetterBase<unsigned long long>

    74 {

    75     static const VARENUM VariantType = VT_UI8;

    76 

    77     static void setVariant(VARIANT* variant, unsigned long long value)

    78     {

    79         ASSERT(V_VT(variant) == VT_EMPTY);

    80 

    81         V_VT(variant) = VariantType;

    82         V_UI8(variant) = value;

    83     }

    84 };

    85 

    86 template<> struct COMVariantSetter<int> : COMVariantSetterBase<int>

    87 {

    88     static const VARENUM VariantType = VT_I4;

    89 

    90     static void setVariant(VARIANT* variant, int value)

    91     {

    92         ASSERT(V_VT(variant) == VT_EMPTY);

    93 

    94         V_VT(variant) = VariantType;

    95         V_I4(variant) = value;

    96     }

    97 };

    98 

    99 template<> struct COMVariantSetter<float> : COMVariantSetterBase<float>

   100 {

   101     static const VARENUM VariantType = VT_R4;

   102 

   103     static void setVariant(VARIANT* variant, float value)

   104     {

   105         ASSERT(V_VT(variant) == VT_EMPTY);

   106 

   107         V_VT(variant) = VariantType;

   108         V_R4(variant) = value;

   109     }

   110 };

   111 

   112 template<typename T> struct COMVariantSetter<COMPtr<T> > : COMVariantSetterBase<COMPtr<T> >

   113 {

   114     static const VARENUM VariantType = VT_UNKNOWN;

   115 

   116     static void setVariant(VARIANT* variant, const COMPtr<T>& value)

   117     {

   118         ASSERT(V_VT(variant) == VT_EMPTY);

   119 

   120         V_VT(variant) = VariantType;

   121         V_UNKNOWN(variant) = value.get();

   122         value->AddRef();

   123     }

   124 };

   125 

   126 template<typename COMType, typename UnderlyingType>

   127 struct COMIUnknownVariantSetter : COMVariantSetterBase<UnderlyingType>

   128 {

   129     static const VARENUM VariantType = VT_UNKNOWN;

   130 

   131     static void setVariant(VARIANT* variant, const UnderlyingType& value)

   132     {

   133         ASSERT(V_VT(variant) == VT_EMPTY);

   134 

   135         V_VT(variant) = VariantType;

   136         V_UNKNOWN(variant) = COMType::createInstance(value);

   137     }

   138 };

   139 

   140 class COMVariant {

   141 public:

   142     COMVariant()

   143     {

   144         ::VariantInit(&m_variant);

   145     }

   146 

   147     template<typename UnderlyingType>

   148     COMVariant(UnderlyingType value)

   149     {

   150         ::VariantInit(&m_variant);

   151         COMVariantSetter<UnderlyingType>::setVariant(&m_variant, value);

   152     }

   153 

   154     ~COMVariant()

   155     {

   156         ::VariantClear(&m_variant);

   157     }

   158 

   159     COMVariant(const COMVariant& other)

   160     {

   161         ::VariantInit(&m_variant);

   162         other.copyTo(&m_variant);

   163     }

   164 

   165     COMVariant& operator=(const COMVariant& other)

   166     {

   167         other.copyTo(&m_variant);

   168         return *this;

   169     }

   170 

   171     void copyTo(VARIANT* dest) const

   172     {

   173         ::VariantCopy(dest, const_cast<VARIANT*>(&m_variant));

   174     }

   175 

   176     VARENUM variantType() const { return static_cast<VARENUM>(V_VT(&m_variant)); }

   177 

   178 private:

   179     VARIANT m_variant;

   180 };

   181 

   182 template<> struct COMVariantSetter<COMVariant>

   183 {

   184     static inline VARENUM variantType(const COMVariant& value)

   185     {

   186         return value.variantType();

   187     }

   188 

   189     static void setVariant(VARIANT* variant, const COMVariant& value)

   190     {

   191         ASSERT(V_VT(variant) == VT_EMPTY);

   192 

   193         value.copyTo(variant);

   194     }

   195 };

   196 

   197 #endif // COMVariantSetter