src/common/object.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        object.cpp
   3 // Purpose:     wxObject implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "object.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/hash.h"
  25     #if wxUSE_SERIAL
  26         #include "wx/objstrm.h"
  27         #include "wx/serbase.h"
  28
  29         // for error messages
  30         #include "wx/log.h"
  31         #include "wx/intl.h"
  32     #endif // wxUSE_SERIAL
  33 #endif // WX_PRECOMP
  34
  35 #include <string.h>
  36 #include <assert.h>
  37
  38 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  39 #include "wx/memory.h"
  40 #endif
  41
  42 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  43     // for wxObject::Dump
  44     #include "wx/ioswrap.h"
  45     #if defined(__VISAGECPP__)
  46     // help with VA debugging
  47         #define DEBUG_PRINTF(NAME)   { static int raz=0; \
  48           printf( #NAME " %i\n",raz); fflush(stdout);       \
  49            raz++;                                        \
  50          }
  51     #else
  52         #define DEBUG_PRINTF(NAME)
  53     #endif
  54 #endif
  55
  56 wxClassInfo wxObject::sm_classwxObject((wxChar *) wxT("wxObject"), (wxChar *) NULL, (wxChar *) NULL, (int ) sizeof(wxObject), (wxObjectConstructorFn) NULL);
  57 wxClassInfo* wxClassInfo::sm_first = (wxClassInfo *) NULL;
  58 wxHashTable* wxClassInfo::sm_classTable = (wxHashTable*) NULL;
  59
  60 // These are here so we can avoid 'always true/false' warnings
  61 // by referring to these instead of TRUE/FALSE
  62 const bool wxTrue = TRUE;
  63 const bool wxFalse = FALSE;
  64
  65 /*
  66  * wxWindows root object.
  67  */
  68
  69 wxObject::wxObject()
  70 {
  71     m_refData = (wxObjectRefData *) NULL;
  72 #if wxUSE_SERIAL
  73     m_serialObj = (wxObject_Serialize *)NULL;
  74 #endif
  75 }
  76
  77 wxObject::~wxObject()
  78 {
  79     UnRef();
  80 #if wxUSE_SERIAL
  81     if (m_serialObj)
  82         delete m_serialObj;
  83 #endif
  84 }
  85
  86 /*
  87  * Is this object a kind of (a subclass of) 'info'?
  88  * E.g. is wxWindow a kind of wxObject?
  89  * Go from this class to superclass, taking into account
  90  * two possible base classes.
  91  */
  92
  93 bool wxObject::IsKindOf(wxClassInfo *info) const
  94 {
  95     wxClassInfo *thisInfo = GetClassInfo();
  96     if (thisInfo)
  97         return thisInfo->IsKindOf(info);
  98     else
  99         return FALSE;
 100 }
 101
 102 #if wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
 103 void wxObject::Dump(wxSTD ostream& str)
 104 {
 105     if (GetClassInfo() && GetClassInfo()->GetClassName())
 106         str << GetClassInfo()->GetClassName();
 107     else
 108         str << "unknown object class";
 109 }
 110 #endif
 111
 112 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING
 113
 114 #ifdef new
 115 #undef new
 116 #endif
 117
 118 void *wxObject::operator new (size_t size, wxChar * fileName, int lineNum)
 119 {
 120     return wxDebugAlloc(size, fileName, lineNum, TRUE);
 121 }
 122
 123 #if defined(__VISAGECPP__)
 124 #  if __DEBUG_ALLOC__
 125 void wxObject::operator delete (void * buf,const char * _fname, size_t _line)
 126 {
 127     wxDebugFree(buf);
 128 }
 129 #  endif  //__DEBUG_ALLOC__
 130 #else
 131 void wxObject::operator delete (void * buf)
 132 {
 133     wxDebugFree(buf);
 134 }
 135 #endif // __VISAGECPP__
 136
 137 // VC++ 6.0
 138 #if defined(__VISUALC__) && (__VISUALC__ >= 1200)
 139 void wxObject::operator delete(void* pData, wxChar* /* fileName */, int /* lineNum */)
 140 {
 141     ::operator delete(pData);
 142 }
 143 #endif
 144
 145 // Cause problems for VC++ - crashes
 146 #if (!defined(__VISUALC__) && wxUSE_ARRAY_MEMORY_OPERATORS ) || defined(__MWERKS__)
 147 void * wxObject::operator new[] (size_t size, wxChar * fileName, int lineNum)
 148 {
 149     return wxDebugAlloc(size, fileName, lineNum, TRUE, TRUE);
 150 }
 151
 152 void wxObject::operator delete[] (void * buf)
 153 {
 154     wxDebugFree(buf, TRUE);
 155 }
 156 #endif
 157
 158 #endif
 159
 160 /*
 161  * Class info: provides run-time class type information.
 162  */
 163
 164 wxClassInfo::wxClassInfo(const wxChar *cName,
 165                          const wxChar *baseName1,
 166                          const wxChar *baseName2,
 167                          int sz,
 168                          wxObjectConstructorFn constr)
 169 {
 170     m_className = cName;
 171     m_baseClassName1 = baseName1;
 172     m_baseClassName2 = baseName2;
 173
 174     m_objectSize = sz;
 175     m_objectConstructor = constr;
 176
 177     m_next = sm_first;
 178     sm_first = this;
 179
 180     m_baseInfo1 = (wxClassInfo *) NULL;
 181     m_baseInfo2 = (wxClassInfo *) NULL;
 182 }
 183
 184 wxObject *wxClassInfo::CreateObject()
 185 {
 186     if (m_objectConstructor)
 187         return (wxObject *)(*m_objectConstructor)();
 188     else
 189         return (wxObject *) NULL;
 190 }
 191
 192 wxClassInfo *wxClassInfo::FindClass(const wxChar *c)
 193 {
 194     wxClassInfo *p = sm_first;
 195     while (p)
 196     {
 197         if ( wxStrcmp(p->GetClassName(), c) == 0 )
 198             break;
 199
 200         p = p->m_next;
 201     }
 202
 203     return p;
 204 }
 205
 206 // Climb upwards through inheritance hierarchy.
 207 // Dual inheritance is catered for.
 208 bool wxClassInfo::IsKindOf(const wxClassInfo *info) const
 209 {
 210     if (info == NULL)
 211         return FALSE;
 212
 213     if (this == info)
 214         return TRUE;
 215
 216     if (m_baseInfo1)
 217         if (m_baseInfo1->IsKindOf(info))
 218             return TRUE;
 219
 220     if (m_baseInfo2)
 221         return m_baseInfo2->IsKindOf(info);
 222
 223     return FALSE;
 224 }
 225
 226 // Set pointers to base class(es) to speed up IsKindOf
 227 void wxClassInfo::InitializeClasses()
 228 {
 229     // using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
 230     // link any object module twice mistakenly) will break this function
 231     // because it will enter an infinite loop and eventually die with "out of
 232     // memory" - as this is quite hard to detect if you're unaware of this,
 233     // try to do some checks here
 234 #ifdef __WXDEBUG__
 235     // more classes than we'll ever have
 236     static const size_t nMaxClasses = 10000;
 237     size_t nClass = 0;
 238 #endif // Debug
 239
 240     wxClassInfo::sm_classTable = new wxHashTable(wxKEY_STRING);
 241
 242     // Index all class infos by their class name
 243     wxClassInfo *info = sm_first;
 244     while (info)
 245     {
 246         if (info->m_className)
 247         {
 248             wxASSERT_MSG( ++nClass < nMaxClasses,
 249                           _T("an infinite loop detected - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
 250
 251             sm_classTable->Put(info->m_className, (wxObject *)info);
 252         }
 253
 254         info = info->m_next;
 255     }
 256
 257     // Set base pointers for each wxClassInfo
 258     info = sm_first;
 259     while (info)
 260     {
 261         if (info->GetBaseClassName1())
 262             info->m_baseInfo1 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName1());
 263         if (info->GetBaseClassName2())
 264             info->m_baseInfo2 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName2());
 265         info = info->m_next;
 266     }
 267 }
 268
 269 void wxClassInfo::CleanUpClasses()
 270 {
 271     delete wxClassInfo::sm_classTable;
 272     wxClassInfo::sm_classTable = NULL;
 273 }
 274
 275 wxObject *wxCreateDynamicObject(const wxChar *name)
 276 {
 277 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 278  DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
 279 #endif
 280
 281     if (wxClassInfo::sm_classTable)
 282     {
 283         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 284         if (!info)
 285             return (wxObject *)NULL;
 286
 287         return info->CreateObject();
 288     }
 289     else
 290     {
 291         wxClassInfo *info = wxClassInfo::sm_first;
 292         while (info)
 293         {
 294             if (info->m_className && wxStrcmp(info->m_className, name) == 0)
 295                 return info->CreateObject();
 296             info = info->m_next;
 297         }
 298         return (wxObject*) NULL;
 299     }
 300 }
 301
 302 #if wxUSE_SERIAL
 303
 304 #include "wx/serbase.h"
 305 #include "wx/dynlib.h"
 306
 307 wxObject* wxCreateStoredObject( wxInputStream &stream )
 308 {
 309     wxObjectInputStream obj_s(stream);
 310     return obj_s.LoadObject();
 311 };
 312
 313 void wxObject::StoreObject( wxObjectOutputStream& stream )
 314 {
 315 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 316  DEBUG_PRINTF(wxObject::StoreObject)
 317 #endif
 318
 319     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 320     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 321
 322     if (!lib) {
 323         wxLogError(_("Can't load wxSerial dynamic library."));
 324         return;
 325     }
 326     if (!m_serialObj) {
 327         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 328
 329         if (!m_serialObj) {
 330             wxLogError(_("Can't find the serialization object '%s' "
 331                         "for the object '%s'."),
 332                     obj_name.c_str(),
 333                     GetClassInfo()->GetClassName());
 334             return;
 335         }
 336         m_serialObj->SetObject(this);
 337     }
 338
 339     m_serialObj->StoreObject(stream);
 340 }
 341
 342 void wxObject::LoadObject( wxObjectInputStream& stream )
 343 {
 344 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 345  DEBUG_PRINTF(wxObject::LoadObject)
 346 #endif
 347
 348     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 349     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 350
 351     if (!m_serialObj) {
 352         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 353
 354         if (!m_serialObj) {
 355             wxLogError(_("Can't find the serialization object '%s' "
 356                         "for the object '%s'."),
 357                     obj_name.c_str(),
 358                     GetClassInfo()->GetClassName());
 359             return;
 360         }
 361         m_serialObj->SetObject(this);
 362     }
 363
 364     m_serialObj->LoadObject(stream);
 365 }
 366
 367 #endif // wxUSE_SERIAL
 368
 369 /*
 370  * wxObject: cloning of objects
 371  */
 372
 373 void wxObject::Ref(const wxObject& clone)
 374 {
 375 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 376  DEBUG_PRINTF(wxObject::Ref)
 377 #endif
 378      // delete reference to old data
 379     UnRef();
 380     // reference new data
 381     if (clone.m_refData) {
 382         m_refData = clone.m_refData;
 383         ++(m_refData->m_count);
 384     }
 385 }
 386
 387 void wxObject::UnRef()
 388 {
 389     if ( m_refData )
 390     {
 391         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 392
 393         if ( !--m_refData->m_count )
 394             delete m_refData;
 395         m_refData = (wxObjectRefData *) NULL;
 396     }
 397 }
 398
 399 /*
 400  * wxObjectData
 401  */
 402
 403 wxObjectRefData::wxObjectRefData(void) : m_count(1)
 404 {
 405 }
 406
 407 wxObjectRefData::~wxObjectRefData()
 408 {
 409 }