WebKit/win/COMVariantSetter.h

   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<> struct COMVariantSetter<WebCore::String>
  40 {
  41     static const VARENUM VariantType = VT_BSTR;
  42
  43     static void setVariant(VARIANT* variant, const WebCore::String& value)
  44     {
  45         ASSERT(V_VT(variant) == VT_EMPTY);
  46
  47         V_VT(variant) = VariantType;
  48         V_BSTR(variant) = WebCore::BString(value).release();
  49     }
  50 };
  51
  52 template<> struct COMVariantSetter<unsigned long long>
  53 {
  54     static const VARENUM VariantType = VT_UI8;
  55
  56     static void setVariant(VARIANT* variant, unsigned long long value)
  57     {
  58         ASSERT(V_VT(variant) == VT_EMPTY);
  59
  60         V_VT(variant) = VariantType;
  61         V_UI8(variant) = value;
  62     }
  63 };
  64
  65 template<typename T> struct COMVariantSetter<COMPtr<T> >
  66 {
  67     static const VARENUM VariantType = VT_UNKNOWN;
  68
  69     static void setVariant(VARIANT* variant, const COMPtr<T>& value)
  70     {
  71         ASSERT(V_VT(variant) == VT_EMPTY);
  72
  73         V_VT(variant) = VariantType;
  74         V_UNKNOWN(variant) = value.get();
  75         value->AddRef();
  76     }
  77 };
  78
  79 template<typename COMType, typename UnderlyingType>
  80 struct COMIUnknownVariantSetter
  81 {
  82     static const VARENUM VariantType = VT_UNKNOWN;
  83
  84     static void setVariant(VARIANT* variant, const UnderlyingType& value)
  85     {
  86         ASSERT(V_VT(variant) == VT_EMPTY);
  87
  88         V_VT(variant) = VariantType;
  89         V_UNKNOWN(variant) = COMType::createInstance(value);
  90     }
  91 };
  92
  93 #endif // COMVariantSetter