runtime/DateInstance.h

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #ifndef DateInstance_h
  22 #define DateInstance_h
  23
  24 #include "JSWrapperObject.h"
  25
  26 namespace WTF {
  27     struct GregorianDateTime;
  28 }
  29
  30 namespace JSC {
  31
  32     class DateInstance : public JSWrapperObject {
  33     public:
  34         DateInstance(ExecState*, double);
  35         DateInstance(ExecState*, NonNullPassRefPtr<Structure>, double);
  36         explicit DateInstance(ExecState*, NonNullPassRefPtr<Structure>);
  37
  38         double internalNumber() const { return internalValue().uncheckedGetNumber(); }
  39
  40         static JS_EXPORTDATA const ClassInfo info;
  41
  42         const GregorianDateTime* gregorianDateTime(ExecState* exec) const
  43         {
  44             if (m_data && m_data->m_gregorianDateTimeCachedForMS == internalNumber())
  45                 return &m_data->m_cachedGregorianDateTime;
  46             return calculateGregorianDateTime(exec);
  47         }
  48
  49         const GregorianDateTime* gregorianDateTimeUTC(ExecState* exec) const
  50         {
  51             if (m_data && m_data->m_gregorianDateTimeUTCCachedForMS == internalNumber())
  52                 return &m_data->m_cachedGregorianDateTimeUTC;
  53             return calculateGregorianDateTimeUTC(exec);
  54         }
  55
  56         static PassRefPtr<Structure> createStructure(JSValue prototype)
  57         {
  58             return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
  59         }
  60
  61     protected:
  62         static const unsigned StructureFlags = OverridesMarkChildren | JSWrapperObject::StructureFlags;
  63
  64     private:
  65         const GregorianDateTime* calculateGregorianDateTime(ExecState*) const;
  66         const GregorianDateTime* calculateGregorianDateTimeUTC(ExecState*) const;
  67         virtual const ClassInfo* classInfo() const { return &info; }
  68
  69         mutable RefPtr<DateInstanceData> m_data;
  70     };
  71
  72     DateInstance* asDateInstance(JSValue);
  73
  74     inline DateInstance* asDateInstance(JSValue value)
  75     {
  76         ASSERT(asObject(value)->inherits(&DateInstance::info));
  77         return static_cast<DateInstance*>(asObject(value));
  78     }
  79
  80 } // namespace JSC
  81
  82 #endif // DateInstance_h