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 #endif
  46
  47 #if !USE_SHARED_LIBRARY
  48 wxClassInfo wxObject::sm_classwxObject((char *) "wxObject", (char *) NULL, (char *) NULL, (int ) sizeof(wxObject), (wxObjectConstructorFn) NULL);
  49 wxClassInfo* wxClassInfo::sm_first = (wxClassInfo *) NULL;
  50 wxHashTable* wxClassInfo::sm_classTable = (wxHashTable*) NULL;
  51 #endif
  52
  53 /*
  54  * wxWindows root object.
  55  */
  56
  57 wxObject::wxObject()
  58 {
  59     m_refData = (wxObjectRefData *) NULL;
  60 #if wxUSE_SERIAL
  61     m_serialObj = (wxObject_Serialize *)NULL;
  62 #endif
  63 }
  64
  65 wxObject::~wxObject()
  66 {
  67     UnRef();
  68 #if wxUSE_SERIAL
  69     if (m_serialObj)
  70         delete m_serialObj;
  71 #endif
  72 }
  73
  74 /*
  75  * Is this object a kind of (a subclass of) 'info'?
  76  * E.g. is wxWindow a kind of wxObject?
  77  * Go from this class to superclass, taking into account
  78  * two possible base classes.
  79  */
  80
  81 bool wxObject::IsKindOf(wxClassInfo *info) const
  82 {
  83     wxClassInfo *thisInfo = GetClassInfo();
  84     if (thisInfo)
  85         return thisInfo->IsKindOf(info);
  86     else
  87         return FALSE;
  88 }
  89
  90 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  91 void wxObject::Dump(ostream& str)
  92 {
  93     if (GetClassInfo() && GetClassInfo()->GetClassName())
  94         str << GetClassInfo()->GetClassName();
  95     else
  96         str << "unknown object class";
  97 }
  98 #endif
  99
 100 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING
 101
 102 #ifdef new
 103 #undef new
 104 #endif
 105
 106 void *wxObject::operator new (size_t size, char * fileName, int lineNum)
 107 {
 108     return wxDebugAlloc(size, fileName, lineNum, TRUE);
 109 }
 110
 111 void wxObject::operator delete (void * buf)
 112 {
 113     wxDebugFree(buf);
 114 }
 115
 116 // VC++ 6.0
 117 #if defined(__VISUALC__) && (__VISUALC__ >= 1200)
 118 void wxObject::operator delete(void* pData, char* /* fileName */, int /* lineNum */)
 119 {
 120     ::operator delete(pData);
 121 }
 122 #endif
 123
 124 // Cause problems for VC++ - crashes
 125 #if !defined(__VISUALC__) && wxUSE_ARRAY_MEMORY_OPERATORS
 126 void * wxObject::operator new[] (size_t size, char * fileName, int lineNum)
 127 {
 128     return wxDebugAlloc(size, fileName, lineNum, TRUE, TRUE);
 129 }
 130
 131 void wxObject::operator delete[] (void * buf)
 132 {
 133     wxDebugFree(buf, TRUE);
 134 }
 135 #endif
 136
 137 #endif
 138
 139 /*
 140  * Class info: provides run-time class type information.
 141  */
 142
 143 wxClassInfo::wxClassInfo(char *cName, char *baseName1, char *baseName2, int sz, wxObjectConstructorFn constr)
 144 {
 145     m_className = cName;
 146     m_baseClassName1 = baseName1;
 147     m_baseClassName2 = baseName2;
 148
 149     m_objectSize = sz;
 150     m_objectConstructor = constr;
 151
 152     m_next = sm_first;
 153     sm_first = this;
 154
 155     m_baseInfo1 = (wxClassInfo *) NULL;
 156     m_baseInfo2 = (wxClassInfo *) NULL;
 157 }
 158
 159 wxObject *wxClassInfo::CreateObject()
 160 {
 161     if (m_objectConstructor)
 162         return (wxObject *)(*m_objectConstructor)();
 163     else
 164         return (wxObject *) NULL;
 165 }
 166
 167 wxClassInfo *wxClassInfo::FindClass(char *c)
 168 {
 169     wxClassInfo *p = sm_first;
 170     while (p)
 171     {
 172         if (p && p->GetClassName() && strcmp(p->GetClassName(), c) == 0)
 173             return p;
 174         p = p->m_next;
 175     }
 176     return (wxClassInfo *) NULL;
 177 }
 178
 179 // Climb upwards through inheritance hierarchy.
 180 // Dual inheritance is catered for.
 181 bool wxClassInfo::IsKindOf(wxClassInfo *info) const
 182 {
 183     if (info == NULL)
 184         return FALSE;
 185
 186     // For some reason, when making/using a DLL, static data has to be included
 187     // in both the DLL and the application. This can lead to duplicate
 188     // wxClassInfo objects, so we have to test the name instead of the pointers.
 189     // PROBABLY NO LONGER TRUE now I've done DLL creation right.
 190     /*
 191 #if WXMAKINGDLL
 192 if (GetClassName() && info->GetClassName() && (strcmp(GetClassName(), info->GetClassName()) == 0))
 193 return TRUE;
 194 #else
 195      */
 196     if (this == info)
 197         return TRUE;
 198
 199     if (m_baseInfo1)
 200         if (m_baseInfo1->IsKindOf(info))
 201             return TRUE;
 202
 203     if (m_baseInfo2)
 204         return m_baseInfo2->IsKindOf(info);
 205
 206     return FALSE;
 207 }
 208
 209 // Set pointers to base class(es) to speed up IsKindOf
 210 void wxClassInfo::InitializeClasses()
 211 {
 212     wxClassInfo::sm_classTable = new wxHashTable(wxKEY_STRING);
 213
 214     // Index all class infos by their class name
 215     wxClassInfo *info = sm_first;
 216     while (info)
 217     {
 218         if (info->m_className)
 219             sm_classTable->Put(info->m_className, (wxObject *)info);
 220         info = info->m_next;
 221     }
 222
 223     // Set base pointers for each wxClassInfo
 224     info = sm_first;
 225     while (info)
 226     {
 227         if (info->GetBaseClassName1())
 228             info->m_baseInfo1 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName1());
 229         if (info->GetBaseClassName2())
 230             info->m_baseInfo2 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName2());
 231         info = info->m_next;
 232     }
 233 }
 234
 235 void wxClassInfo::CleanUpClasses()
 236 {
 237     delete wxClassInfo::sm_classTable;
 238     wxClassInfo::sm_classTable = NULL;
 239 }
 240
 241 wxObject *wxCreateDynamicObject(const char *name)
 242 {
 243     if (wxClassInfo::sm_classTable)
 244     {
 245         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 246         if (!info)
 247             return (wxObject *)NULL;
 248
 249         return info->CreateObject();
 250     }
 251     else
 252     {
 253         wxClassInfo *info = wxClassInfo::sm_first;
 254         while (info)
 255         {
 256             if (info->m_className && strcmp(info->m_className, name) == 0)
 257                 return info->CreateObject();
 258             info = info->m_next;
 259         }
 260         return (wxObject*) NULL;
 261     }
 262     return (wxObject*) NULL;
 263 }
 264
 265 #if wxUSE_SERIAL
 266
 267 #include "wx/serbase.h"
 268 #include "wx/dynlib.h"
 269 #include "wx/msgdlg.h"
 270
 271 wxObject* wxCreateStoredObject( wxInputStream &stream )
 272 {
 273     wxObjectInputStream obj_s(stream);
 274     return obj_s.LoadObject();
 275 };
 276
 277 void wxObject::StoreObject( wxObjectOutputStream& stream )
 278 {
 279     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 280     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 281
 282     if (!lib) {
 283         wxLogError(_("Can't load wxSerial dynamic library."));
 284         return;
 285     }
 286     if (!m_serialObj) {
 287         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 288
 289         if (!m_serialObj) {
 290             wxLogError(_("Can't find the serialization object '%s' "
 291                         "for the object '%s'."),
 292                     obj_name.c_str(),
 293                     GetClassInfo()->GetClassName());
 294             return;
 295         }
 296         m_serialObj->SetObject(this);
 297     }
 298
 299     m_serialObj->StoreObject(stream);
 300 }
 301
 302 void wxObject::LoadObject( wxObjectInputStream& stream )
 303 {
 304     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 305     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 306
 307     if (!m_serialObj) {
 308         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 309
 310         if (!m_serialObj) {
 311             wxLogError(_("Can't find the serialization object '%s' "
 312                         "for the object '%s'."),
 313                     obj_name.c_str(),
 314                     GetClassInfo()->GetClassName());
 315             return;
 316         }
 317         m_serialObj->SetObject(this);
 318     }
 319
 320     m_serialObj->LoadObject(stream);
 321 }
 322
 323 #endif // wxUSE_SERIAL
 324
 325 /*
 326  * wxObject: cloning of objects
 327  */
 328
 329 void wxObject::Ref(const wxObject& clone)
 330 {
 331     // delete reference to old data
 332     UnRef();
 333     // reference new data
 334     if (clone.m_refData) {
 335         m_refData = clone.m_refData;
 336         ++(m_refData->m_count);
 337     }
 338 }
 339
 340 void wxObject::UnRef()
 341 {
 342     if (m_refData) {
 343         assert(m_refData->m_count > 0);
 344         --(m_refData->m_count);
 345         if (m_refData->m_count == 0)
 346             delete m_refData;
 347     }
 348     m_refData = (wxObjectRefData *) NULL;
 349 }
 350
 351 /*
 352  * wxObjectData
 353  */
 354
 355 wxObjectRefData::wxObjectRefData(void) : m_count(1)
 356 {
 357 }
 358
 359 wxObjectRefData::~wxObjectRefData()
 360 {
 361 }
 362
 363 // These are here so we can avoid 'always true/false' warnings
 364 // by referring to these instead of TRUE/FALSE
 365 const bool wxTrue = TRUE;
 366 const bool wxFalse = FALSE;