src/common/any.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/any.cpp
   3 // Purpose:     wxAny class, container for any type
   4 // Author:      Jaakko Salli
   5 // Modified by:
   6 // Created:     07/05/2009
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx/wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #include "wx/any.h"
  20
  21 #if wxUSE_ANY
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/math.h"
  25     #include "wx/crt.h"
  26 #endif
  27
  28 #include "wx/vector.h"
  29 #include "wx/module.h"
  30 #include "wx/hashmap.h"
  31 #include "wx/hashset.h"
  32
  33 using namespace wxPrivate;
  34
  35 #if wxUSE_VARIANT
  36
  37 //-------------------------------------------------------------------------
  38 // wxAnyValueTypeGlobals
  39 //-------------------------------------------------------------------------
  40
  41 WX_DECLARE_HASH_MAP(wxAnyValueType*,
  42                     wxVariantDataFactory,
  43                     wxPointerHash,
  44                     wxPointerEqual,
  45                     wxAnyTypeToVariantDataFactoryMap);
  46
  47 //
  48 // Helper class to manage global variables related to type conversion
  49 // between wxAny and wxVariant.
  50 //
  51 class wxAnyValueTypeGlobals
  52 {
  53 public:
  54     wxAnyValueTypeGlobals()
  55     {
  56     }
  57     ~wxAnyValueTypeGlobals()
  58     {
  59         m_anyToVariant.clear();
  60     }
  61
  62     void PreRegisterAnyToVariant(wxAnyToVariantRegistration* reg)
  63     {
  64         m_anyToVariantRegs.push_back(reg);
  65     }
  66
  67     // Find wxVariantData factory function for given value type,
  68     // (or compatible, if possible)
  69     wxVariantDataFactory FindVariantDataFactory(const wxAnyValueType* type_)
  70     {
  71         // Ideally we'd have the hash map of type 'const wxAnyValueType*',
  72         // but WX_DECLARE_HASH_MAP() has some trouble with it.
  73         wxAnyValueType* type = const_cast<wxAnyValueType*>(type_);
  74
  75         wxAnyTypeToVariantDataFactoryMap& anyToVariant = m_anyToVariant;
  76         wxAnyTypeToVariantDataFactoryMap::const_iterator it;
  77         it = anyToVariant.find(type);
  78         if ( it != anyToVariant.end() )
  79             return it->second;
  80
  81         // Not found, handle pre-registrations
  82         size_t i = m_anyToVariantRegs.size();
  83         while ( i > 0 )
  84         {
  85             i--;
  86             wxAnyToVariantRegistration* reg = m_anyToVariantRegs[i];
  87             wxAnyValueType* assocType = reg->GetAssociatedType();
  88             if ( assocType )
  89             {
  90                 // Both variant data and wxAnyValueType have been
  91                 // now been properly initialized, so remove the
  92                 // pre-registration entry and move data to anyToVarian
  93                 // map.
  94                 anyToVariant[assocType] = reg->GetFactory();
  95                 m_anyToVariantRegs.erase( m_anyToVariantRegs.begin() + i );
  96             }
  97         }
  98
  99         // Then try again
 100         it = anyToVariant.find(type);
 101         if ( it != anyToVariant.end() )
 102             return it->second;
 103
 104         // Finally, attempt to find a compatible type
 105         for ( it = anyToVariant.begin(); it != anyToVariant.end(); it++ )
 106         {
 107             if ( type->IsSameType(it->first) )
 108             {
 109                 wxVariantDataFactory f = it->second;
 110                 anyToVariant[type] = f;
 111                 return f;
 112             }
 113         }
 114
 115         // Nothing found
 116         return NULL;
 117     }
 118
 119 private:
 120     wxAnyTypeToVariantDataFactoryMap        m_anyToVariant;
 121     wxVector<wxAnyToVariantRegistration*>   m_anyToVariantRegs;
 122 };
 123
 124 static wxAnyValueTypeGlobals* g_wxAnyValueTypeGlobals = NULL;
 125
 126
 127 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplVariantData)
 128
 129 void wxPreRegisterAnyToVariant(wxAnyToVariantRegistration* reg)
 130 {
 131     if ( !g_wxAnyValueTypeGlobals )
 132         g_wxAnyValueTypeGlobals = new wxAnyValueTypeGlobals();
 133     g_wxAnyValueTypeGlobals->PreRegisterAnyToVariant(reg);
 134 }
 135
 136 bool wxConvertAnyToVariant(const wxAny& any, wxVariant* variant)
 137 {
 138     if ( any.IsNull() )
 139     {
 140         variant->MakeNull();
 141         return true;
 142     }
 143
 144     // (signed) integer is a special case, because there is only one type
 145     // in wxAny, and two ("long" and "longlong") in wxVariant. For better
 146     // backwards compatibility, convert all values that fit in "long",
 147     // and others to "longlong".
 148     if ( wxANY_CHECK_TYPE(any, signed int) )
 149     {
 150 #ifdef wxLongLong_t
 151         wxLongLong_t ll = 0;
 152         if ( any.GetAs(&ll) )
 153         {
 154             // NB: Do not use LONG_MAX here. Explicitly using 32-bit
 155             //     integer constraint yields more consistent behavior across
 156             //     builds.
 157             if ( ll > wxINT32_MAX || ll < wxINT32_MIN )
 158                 *variant = wxLongLong(ll);
 159             else
 160                 *variant = (long) wxLongLong(ll).GetLo();
 161         }
 162         else
 163         {
 164             return false;
 165         }
 166 #else
 167         long l;
 168         if ( any.GetAs(&l) )
 169             *variant = l;
 170         else
 171             return false;
 172 #endif
 173         return true;
 174     }
 175
 176     // Find matching factory function
 177     wxVariantDataFactory f =
 178         g_wxAnyValueTypeGlobals->FindVariantDataFactory(any.GetType());
 179
 180     wxVariantData* data = NULL;
 181
 182     if ( f )
 183     {
 184         data = f(any);
 185     }
 186     else
 187     {
 188         // Check if wxAny wrapped wxVariantData*
 189         if ( !any.GetAs(&data) )
 190         {
 191             // Ok, one last chance: while unlikely, it is possible that the
 192             // wxAny actually contains wxVariant.
 193             if ( wxANY_CHECK_TYPE(any, wxVariant) )
 194                 *variant = wxANY_AS(any, wxVariant);
 195             return false;
 196         }
 197
 198         // Wrapper's GetValue() does not increase reference
 199         // count, se have to do it before the data gets passed
 200         // to a new variant.
 201         data->IncRef();
 202     }
 203
 204     variant->SetData(data);
 205     return true;
 206 }
 207
 208 //
 209 // This class is to make sure that wxAnyValueType instances
 210 // etc. get freed correctly. We must use a separate wxAnyValueTypeGlobals
 211 // because wxModule itself is instantiated too late.
 212 //
 213 class wxAnyValueTypeGlobalsManager : public wxModule
 214 {
 215     DECLARE_DYNAMIC_CLASS(wxAnyValueTypeGlobalsManager)
 216 public:
 217     wxAnyValueTypeGlobalsManager() : wxModule() { }
 218     virtual ~wxAnyValueTypeGlobalsManager() { }
 219
 220     virtual bool OnInit()
 221     {
 222         return true;
 223     }
 224     virtual void OnExit()
 225     {
 226         wxDELETE(g_wxAnyValueTypeGlobals);
 227     }
 228 private:
 229 };
 230
 231 IMPLEMENT_DYNAMIC_CLASS(wxAnyValueTypeGlobalsManager, wxModule)
 232
 233 #endif // wxUSE_VARIANT
 234
 235
 236 //-------------------------------------------------------------------------
 237 // Dynamic conversion member functions
 238 //-------------------------------------------------------------------------
 239
 240 //
 241 // Define integer minimum and maximum as helpers
 242 #ifdef wxLongLong_t
 243     #define UseIntMin  (wxINT64_MIN)
 244     #define UseIntMax  (wxINT64_MAX)
 245     #define UseUintMax (wxUINT64_MAX)
 246 #else
 247     #define UseIntMin  (LONG_MIN)
 248     #define UseIntMax  (LONG_MAX)
 249     #define UseUintMax (ULONG_MAX)
 250 #endif
 251
 252 namespace
 253 {
 254
 255 const double UseIntMinF = static_cast<double>(UseIntMin);
 256 const double UseIntMaxF = static_cast<double>(UseIntMax);
 257 const double UseUintMaxF = static_cast<double>(UseUintMax);
 258
 259 } // anonymous namespace
 260
 261 bool wxAnyValueTypeImplInt::ConvertValue(const wxAnyValueBuffer& src,
 262                                          wxAnyValueType* dstType,
 263                                          wxAnyValueBuffer& dst) const
 264 {
 265     wxAnyBaseIntType value = GetValue(src);
 266     if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxString) )
 267     {
 268 #ifdef wxLongLong_t
 269         wxLongLong ll(value);
 270         wxString s = ll.ToString();
 271 #else
 272         wxString s = wxString::Format(wxS("%ld"), (long)value);
 273 #endif
 274         wxAnyValueTypeImpl<wxString>::SetValue(s, dst);
 275     }
 276     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseUintType) )
 277     {
 278         if ( value < 0 )
 279             return false;
 280         wxAnyBaseUintType ul = (wxAnyBaseUintType) value;
 281         wxAnyValueTypeImplUint::SetValue(ul, dst);
 282     }
 283     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, double) )
 284     {
 285         double value2 = static_cast<double>(value);
 286         wxAnyValueTypeImplDouble::SetValue(value2, dst);
 287     }
 288     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, bool) )
 289     {
 290         bool value2 = value ? true : false;
 291         wxAnyValueTypeImpl<bool>::SetValue(value2, dst);
 292     }
 293     else
 294         return false;
 295
 296     return true;
 297 }
 298
 299 bool wxAnyValueTypeImplUint::ConvertValue(const wxAnyValueBuffer& src,
 300                                           wxAnyValueType* dstType,
 301                                           wxAnyValueBuffer& dst) const
 302 {
 303     wxAnyBaseUintType value = GetValue(src);
 304     if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxString) )
 305     {
 306 #ifdef wxLongLong_t
 307         wxULongLong ull(value);
 308         wxString s = ull.ToString();
 309 #else
 310         wxString s = wxString::Format(wxS("%lu"), (long)value);
 311 #endif
 312         wxAnyValueTypeImpl<wxString>::SetValue(s, dst);
 313     }
 314     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseIntType) )
 315     {
 316         if ( value > UseIntMax )
 317             return false;
 318         wxAnyBaseIntType l = (wxAnyBaseIntType) value;
 319         wxAnyValueTypeImplInt::SetValue(l, dst);
 320     }
 321     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, double) )
 322     {
 323 #ifndef __VISUALC6__
 324         double value2 = static_cast<double>(value);
 325 #else
 326         // VC6 doesn't implement conversion from unsigned __int64 to double
 327         wxAnyBaseIntType value0 = static_cast<wxAnyBaseIntType>(value);
 328         double value2 = static_cast<double>(value0);
 329 #endif
 330         wxAnyValueTypeImplDouble::SetValue(value2, dst);
 331     }
 332     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, bool) )
 333     {
 334         bool value2 = value ? true : false;
 335         wxAnyValueTypeImpl<bool>::SetValue(value2, dst);
 336     }
 337     else
 338         return false;
 339
 340     return true;
 341 }
 342
 343 // Convert wxString to destination wxAny value type
 344 bool wxAnyConvertString(const wxString& value,
 345                         wxAnyValueType* dstType,
 346                         wxAnyValueBuffer& dst)
 347 {
 348     if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxString) )
 349     {
 350         wxAnyValueTypeImpl<wxString>::SetValue(value, dst);
 351     }
 352     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseIntType) )
 353     {
 354         wxAnyBaseIntType value2;
 355 #ifdef wxLongLong_t
 356         if ( !value.ToLongLong(&value2) )
 357 #else
 358         if ( !value.ToLong(&value2) )
 359 #endif
 360             return false;
 361         wxAnyValueTypeImplInt::SetValue(value2, dst);
 362     }
 363     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseUintType) )
 364     {
 365         wxAnyBaseUintType value2;
 366 #ifdef wxLongLong_t
 367         if ( !value.ToULongLong(&value2) )
 368 #else
 369         if ( !value.ToULong(&value2) )
 370 #endif
 371             return false;
 372         wxAnyValueTypeImplUint::SetValue(value2, dst);
 373     }
 374     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, double) )
 375     {
 376         double value2;
 377         if ( !value.ToDouble(&value2) )
 378             return false;
 379         wxAnyValueTypeImplDouble::SetValue(value2, dst);
 380     }
 381     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, bool) )
 382     {
 383         bool value2;
 384         wxString s(value);
 385         s.MakeLower();
 386         if ( s == wxS("true") ||
 387              s == wxS("yes") ||
 388              s == wxS('1') )
 389             value2 = true;
 390         else if ( s == wxS("false") ||
 391                   s == wxS("no") ||
 392                   s == wxS('0') )
 393             value2 = false;
 394         else
 395             return false;
 396
 397         wxAnyValueTypeImpl<bool>::SetValue(value2, dst);
 398     }
 399     else
 400         return false;
 401
 402     return true;
 403 }
 404
 405 bool wxAnyValueTypeImpl<bool>::ConvertValue(const wxAnyValueBuffer& src,
 406                                             wxAnyValueType* dstType,
 407                                             wxAnyValueBuffer& dst) const
 408 {
 409     bool value = GetValue(src);
 410     if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseIntType) )
 411     {
 412         wxAnyBaseIntType value2 = static_cast<wxAnyBaseIntType>(value);
 413         wxAnyValueTypeImplInt::SetValue(value2, dst);
 414     }
 415     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseUintType) )
 416     {
 417         wxAnyBaseIntType value2 = static_cast<wxAnyBaseUintType>(value);
 418         wxAnyValueTypeImplUint::SetValue(value2, dst);
 419     }
 420     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxString) )
 421     {
 422         wxString s;
 423         if ( value )
 424             s = wxS("true");
 425         else
 426             s = wxS("false");
 427         wxAnyValueTypeImpl<wxString>::SetValue(s, dst);
 428     }
 429     else
 430         return false;
 431
 432     return true;
 433 }
 434
 435 bool wxAnyValueTypeImplDouble::ConvertValue(const wxAnyValueBuffer& src,
 436                                             wxAnyValueType* dstType,
 437                                             wxAnyValueBuffer& dst) const
 438 {
 439     double value = GetValue(src);
 440     if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseIntType) )
 441     {
 442         if ( value < UseIntMinF || value > UseIntMaxF )
 443             return false;
 444         wxAnyBaseUintType ul = static_cast<wxAnyBaseUintType>(value);
 445         wxAnyValueTypeImplUint::SetValue(ul, dst);
 446     }
 447     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxAnyBaseUintType) )
 448     {
 449         if ( value < 0.0 || value > UseUintMaxF )
 450             return false;
 451         wxAnyBaseUintType ul = static_cast<wxAnyBaseUintType>(value);
 452         wxAnyValueTypeImplUint::SetValue(ul, dst);
 453     }
 454     else if ( wxANY_VALUE_TYPE_CHECK_TYPE(dstType, wxString) )
 455     {
 456         wxString s = wxString::Format(wxS("%.14g"), value);
 457         wxAnyValueTypeImpl<wxString>::SetValue(s, dst);
 458     }
 459     else
 460         return false;
 461
 462     return true;
 463 }
 464
 465 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplInt)
 466 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplUint)
 467 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<bool>)
 468 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplDouble)
 469
 470 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplwxString)
 471 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplConstCharPtr)
 472 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplConstWchar_tPtr)
 473
 474 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxDateTime>)
 475 //WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxObject*>)
 476 //WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxArrayString>)
 477
 478 //-------------------------------------------------------------------------
 479 // wxAnyNullValueType implementation
 480 //-------------------------------------------------------------------------
 481
 482 class wxAnyNullValue
 483 {
 484 private:
 485     void*   m_dummy;
 486 };
 487
 488 template <>
 489 class wxAnyValueTypeImpl<wxAnyNullValue> : public wxAnyValueType
 490 {
 491     WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxAnyNullValue>)
 492 public:
 493     // Dummy implementations
 494     virtual void DeleteValue(wxAnyValueBuffer& buf) const
 495     {
 496         wxUnusedVar(buf);
 497     }
 498
 499     virtual void CopyBuffer(const wxAnyValueBuffer& src,
 500                             wxAnyValueBuffer& dst) const
 501     {
 502         wxUnusedVar(src);
 503         wxUnusedVar(dst);
 504     }
 505
 506     virtual bool ConvertValue(const wxAnyValueBuffer& src,
 507                               wxAnyValueType* dstType,
 508                               wxAnyValueBuffer& dst) const
 509     {
 510         wxUnusedVar(src);
 511         wxUnusedVar(dstType);
 512         wxUnusedVar(dst);
 513         return false;
 514     }
 515
 516 private:
 517 };
 518
 519 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxAnyNullValue>)
 520
 521 wxAnyValueType* wxAnyNullValueType =
 522     wxAnyValueTypeImpl<wxAnyNullValue>::GetInstance();
 523
 524 #endif // wxUSE_ANY