src/common/xtixml.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/xtixml.cpp
   3 // Purpose:     streaming runtime metadata information
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     27/07/03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_EXTENDED_RTTI
  20
  21 #include "wx/xtixml.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/object.h"
  25     #include "wx/hash.h"
  26     #include "wx/event.h"
  27 #endif
  28
  29 #include "wx/xml/xml.h"
  30 #include "wx/tokenzr.h"
  31 #include "wx/txtstrm.h"
  32
  33 #include "wx/xtistrm.h"
  34
  35 #include "wx/beforestd.h"
  36 #include <map>
  37 #include <vector>
  38 #include <string>
  39 #include "wx/afterstd.h"
  40
  41 using namespace std ;
  42
  43 //
  44 // XML Streaming
  45 //
  46
  47 // convenience functions
  48
  49 void wxXmlAddContentToNode( wxXmlNode* node , const wxString& data )
  50 {
  51     node->AddChild(new wxXmlNode(wxXML_TEXT_NODE, wxT("value"), data ) );
  52 }
  53
  54 wxString wxXmlGetContentFromNode( wxXmlNode *node )
  55 {
  56     if ( node->GetChildren() )
  57         return node->GetChildren()->GetContent() ;
  58     else
  59         return wxEmptyString ;
  60 }
  61
  62 struct wxXmlWriter::wxXmlWriterInternal
  63 {
  64     wxXmlNode *m_root ;
  65     wxXmlNode *m_current ;
  66     vector< wxXmlNode * > m_objectStack ;
  67
  68     void Push( wxXmlNode *newCurrent )
  69     {
  70         m_objectStack.push_back( m_current ) ;
  71         m_current = newCurrent ;
  72     }
  73
  74     void Pop()
  75     {
  76         m_current = m_objectStack.back() ;
  77         m_objectStack.pop_back() ;
  78     }
  79 } ;
  80
  81 wxXmlWriter::wxXmlWriter( wxXmlNode * rootnode )
  82 {
  83     m_data = new wxXmlWriterInternal() ;
  84     m_data->m_root = rootnode ;
  85     m_data->m_current = rootnode ;
  86 }
  87
  88 wxXmlWriter::~wxXmlWriter()
  89 {
  90     delete m_data ;
  91 }
  92
  93 void wxXmlWriter::DoBeginWriteTopLevelEntry( const wxString &name )
  94 {
  95     wxXmlNode *pnode;
  96     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("entry"));
  97     pnode->AddAttribute(wxString(wxT("name")), name);
  98     m_data->m_current->AddChild(pnode) ;
  99     m_data->Push( pnode ) ;
 100 }
 101
 102 void wxXmlWriter::DoEndWriteTopLevelEntry( const wxString &WXUNUSED(name) )
 103 {
 104     m_data->Pop() ;
 105 }
 106
 107 void wxXmlWriter::DoBeginWriteObject(const wxObject *WXUNUSED(object), const wxClassInfo *classInfo, int objectID , wxxVariantArray &metadata   )
 108 {
 109     wxXmlNode *pnode;
 110     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 111     pnode->AddAttribute(wxT("class"), wxString(classInfo->GetClassName()));
 112     pnode->AddAttribute(wxT("id"), wxString::Format( wxT("%d") , objectID ) );
 113
 114     for ( size_t i = 0 ; i < metadata.GetCount() ; ++i )
 115     {
 116         pnode->AddAttribute( metadata[i].GetName() , metadata[i].GetAsString() ) ;
 117     }
 118     m_data->m_current->AddChild(pnode) ;
 119     m_data->Push( pnode ) ;
 120 }
 121
 122 // end of writing the root object
 123 void wxXmlWriter::DoEndWriteObject(const wxObject *WXUNUSED(object), const wxClassInfo *WXUNUSED(classInfo), int WXUNUSED(objectID) )
 124 {
 125     m_data->Pop() ;
 126 }
 127
 128 // writes a property in the stream format
 129 void wxXmlWriter::DoWriteSimpleType( wxxVariant &value )
 130 {
 131     wxXmlAddContentToNode( m_data->m_current ,value.GetAsString() ) ;
 132 }
 133
 134 void wxXmlWriter::DoBeginWriteElement()
 135 {
 136     wxXmlNode *pnode;
 137     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("element") );
 138     m_data->m_current->AddChild(pnode) ;
 139     m_data->Push( pnode ) ;
 140 }
 141
 142 void wxXmlWriter::DoEndWriteElement()
 143 {
 144     m_data->Pop() ;
 145 }
 146
 147 void wxXmlWriter::DoBeginWriteProperty(const wxPropertyInfo *pi )
 148 {
 149     wxXmlNode *pnode;
 150     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("prop") );
 151     pnode->AddAttribute(wxT("name"), pi->GetName() );
 152     m_data->m_current->AddChild(pnode) ;
 153     m_data->Push( pnode ) ;
 154 }
 155
 156 void wxXmlWriter::DoEndWriteProperty(const wxPropertyInfo *WXUNUSED(propInfo) )
 157 {
 158     m_data->Pop() ;
 159 }
 160
 161
 162
 163 // insert an object reference to an already written object
 164 void wxXmlWriter::DoWriteRepeatedObject( int objectID )
 165 {
 166     wxXmlNode *pnode;
 167     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 168     pnode->AddAttribute(wxString(wxT("href")), wxString::Format( wxT("%d") , objectID ) );
 169     m_data->m_current->AddChild(pnode) ;
 170 }
 171
 172 // insert a null reference
 173 void wxXmlWriter::DoWriteNullObject()
 174 {
 175     wxXmlNode *pnode;
 176     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 177     m_data->m_current->AddChild(pnode) ;
 178 }
 179
 180 // writes a delegate in the stream format
 181 void wxXmlWriter::DoWriteDelegate( const wxObject *WXUNUSED(object),  const wxClassInfo* WXUNUSED(classInfo) , const wxPropertyInfo *WXUNUSED(pi) ,
 182                                   const wxObject *eventSink, int sinkObjectID , const wxClassInfo* WXUNUSED(eventSinkClassInfo) , const wxHandlerInfo* handlerInfo )
 183 {
 184     if ( eventSink != NULL && handlerInfo != NULL )
 185     {
 186         wxXmlAddContentToNode( m_data->m_current ,wxString::Format(wxT("%d.%s"), sinkObjectID , handlerInfo->GetName().c_str()) ) ;
 187     }
 188 }
 189
 190 // ----------------------------------------------------------------------------
 191 // reading objects in
 192 // ----------------------------------------------------------------------------
 193
 194
 195
 196 // ----------------------------------------------------------------------------
 197 // reading xml in
 198 // ----------------------------------------------------------------------------
 199
 200 /*
 201 Reading components has not to be extended for components
 202 as properties are always sought by typeinfo over all levels
 203 and create params are always toplevel class only
 204 */
 205
 206 int wxXmlReader::ReadComponent(wxXmlNode *node, wxDepersister *callbacks)
 207 {
 208     wxASSERT_MSG( callbacks , wxT("Does not support reading without a Depersistor") ) ;
 209     wxString className;
 210     wxClassInfo *classInfo;
 211
 212     wxxVariant *createParams ;
 213     int *createParamOids ;
 214     const wxClassInfo** createClassInfos ;
 215     wxXmlNode *children;
 216     int objectID;
 217     wxString ObjectIdString ;
 218
 219     children = node->GetChildren();
 220     if (!children)
 221     {
 222         // check for a null object or href
 223         if (node->GetAttribute(wxT("href") , &ObjectIdString ) )
 224         {
 225             objectID = atoi( ObjectIdString.ToAscii() ) ;
 226             if ( HasObjectClassInfo( objectID ) )
 227             {
 228                 return objectID ;
 229             }
 230             else
 231             {
 232                 wxLogError( _("Forward hrefs are not supported") ) ;
 233                 return wxInvalidObjectID ;
 234             }
 235         }
 236         if ( !node->GetAttribute(wxT("id") , &ObjectIdString ) )
 237         {
 238             return wxNullObjectID;
 239         }
 240     }
 241     if (!node->GetAttribute(wxT("class"), &className))
 242     {
 243         // No class name.  Eek. FIXME: error handling
 244         return wxInvalidObjectID;
 245     }
 246     classInfo = wxClassInfo::FindClass(className);
 247     if ( classInfo == NULL )
 248     {
 249         wxLogError( wxString::Format(_("unknown class %s"),className ) ) ;
 250         return wxInvalidObjectID ;
 251     }
 252
 253     if ( children != NULL && children->GetType() == wxXML_TEXT_NODE )
 254     {
 255         wxLogError(_("objects cannot have XML Text Nodes") ) ;
 256         return wxInvalidObjectID;
 257     }
 258     if (!node->GetAttribute(wxT("id"), &ObjectIdString))
 259     {
 260         wxLogError(_("Objects must have an id attribute") ) ;
 261         // No object id.  Eek. FIXME: error handling
 262         return wxInvalidObjectID;
 263     }
 264     objectID = atoi( ObjectIdString.ToAscii() ) ;
 265     // is this object already has been streamed in, return it here
 266     if ( HasObjectClassInfo( objectID ) )
 267     {
 268         wxLogError ( wxString::Format(_("Doubly used id : %d"), objectID ) ) ;
 269         return wxInvalidObjectID ;
 270     }
 271
 272     // new object, start with allocation
 273     // first make the object know to our internal registry
 274     SetObjectClassInfo( objectID , classInfo ) ;
 275
 276     wxxVariantArray metadata ;
 277     wxXmlAttribute *xp = node->GetAttributes() ;
 278     while ( xp )
 279     {
 280         if ( xp->GetName() != wxString(wxT("class")) && xp->GetName() != wxString(wxT("id")) )
 281         {
 282             metadata.Add( new wxxVariant( xp->GetValue() , xp->GetName() ) ) ;
 283         }
 284         xp = xp->GetNext() ;
 285     }
 286     if ( !classInfo->NeedsDirectConstruction() )
 287         callbacks->AllocateObject(objectID, classInfo, metadata);
 288
 289     //
 290     // stream back the Create parameters first
 291     createParams = new wxxVariant[ classInfo->GetCreateParamCount() ] ;
 292     createParamOids = new int[classInfo->GetCreateParamCount() ] ;
 293     createClassInfos = new const wxClassInfo*[classInfo->GetCreateParamCount() ] ;
 294
 295 #if wxUSE_UNICODE
 296     typedef map<wstring, wxXmlNode *> PropertyNodes ;
 297     typedef vector<wstring> PropertyNames ;
 298 #else
 299     typedef map<string, wxXmlNode *> PropertyNodes ;
 300     typedef vector<string> PropertyNames ;
 301 #endif
 302     PropertyNodes propertyNodes ;
 303     PropertyNames propertyNames ;
 304
 305     while( children )
 306     {
 307         wxString name ;
 308         children->GetAttribute( wxT("name") , &name ) ;
 309         propertyNames.push_back( (const wxChar*)name.c_str() ) ;
 310         propertyNodes[(const wxChar*)name.c_str()] = children->GetChildren() ;
 311         children = children->GetNext() ;
 312     }
 313
 314     for ( int i = 0 ; i <classInfo->GetCreateParamCount() ; ++i )
 315     {
 316         const wxChar* paramName = classInfo->GetCreateParamName(i) ;
 317         PropertyNodes::iterator propiter = propertyNodes.find( paramName ) ;
 318         const wxPropertyInfo* pi = classInfo->FindPropertyInfo( paramName ) ;
 319         if ( pi == 0 )
 320         {
 321             wxLogError( wxString::Format(_("Unkown Property %s"),paramName) ) ;
 322         }
 323         // if we don't have the value of a create param set in the xml
 324         // we use the default value
 325         if ( propiter != propertyNodes.end() )
 326         {
 327             wxXmlNode* prop = propiter->second ;
 328             if ( pi->GetTypeInfo()->IsObjectType() )
 329             {
 330                 createParamOids[i] = ReadComponent( prop , callbacks ) ;
 331                 createClassInfos[i] = dynamic_cast<const wxClassTypeInfo*>(pi->GetTypeInfo())->GetClassInfo() ;
 332             }
 333             else
 334             {
 335                 createParamOids[i] = wxInvalidObjectID ;
 336                 createParams[i] = ReadValue( prop , pi->GetTypeInfo() ) ;
 337                 if( pi->GetFlags() & wxPROP_ENUM_STORE_LONG )
 338                 {
 339                     const wxEnumTypeInfo *eti = dynamic_cast<const wxEnumTypeInfo*>( pi->GetTypeInfo() ) ;
 340                     if ( eti )
 341                     {
 342                         long realval ;
 343                         eti->ConvertToLong( createParams[i]  , realval ) ;
 344                         createParams[i] = wxxVariant( realval ) ;
 345                     }
 346                     else
 347                     {
 348                         wxLogError( _("Type must have enum - long conversion") ) ;
 349                     }
 350                 }
 351                 createClassInfos[i] = NULL ;
 352             }
 353
 354             for ( size_t j = 0 ; j < propertyNames.size() ; ++j )
 355             {
 356                 if ( propertyNames[j] == paramName )
 357                 {
 358                     propertyNames[j] = wxEmptyString ;
 359                     break ;
 360                 }
 361             }
 362         }
 363         else
 364         {
 365             if ( pi->GetTypeInfo()->IsObjectType() )
 366             {
 367                 createParamOids[i] = wxNullObjectID ;
 368                 createClassInfos[i] = dynamic_cast<const wxClassTypeInfo*>(pi->GetTypeInfo())->GetClassInfo() ;
 369             }
 370             else
 371             {
 372                 createParams[i] = pi->GetDefaultValue() ;
 373                 createParamOids[i] = wxInvalidObjectID ;
 374             }
 375         }
 376     }
 377
 378     // got the parameters.  Call the Create method
 379     if ( classInfo->NeedsDirectConstruction() )
 380         callbacks->ConstructObject(objectID, classInfo,
 381             classInfo->GetCreateParamCount(),
 382             createParams, createParamOids, createClassInfos, metadata );
 383     else
 384         callbacks->CreateObject(objectID, classInfo,
 385             classInfo->GetCreateParamCount(),
 386             createParams, createParamOids, createClassInfos, metadata );
 387
 388     // now stream in the rest of the properties, in the sequence their properties were written in the xml
 389     for ( size_t j = 0 ; j < propertyNames.size() ; ++j )
 390     {
 391         if ( propertyNames[j].length() )
 392         {
 393             PropertyNodes::iterator propiter = propertyNodes.find( propertyNames[j] ) ;
 394             if ( propiter != propertyNodes.end() )
 395             {
 396                 wxXmlNode* prop = propiter->second ;
 397                 const wxPropertyInfo* pi = classInfo->FindPropertyInfo( propertyNames[j].c_str() ) ;
 398                 if ( pi->GetTypeInfo()->GetKind() == wxT_COLLECTION )
 399                 {
 400                     const wxCollectionTypeInfo* collType = dynamic_cast< const wxCollectionTypeInfo* >( pi->GetTypeInfo() ) ;
 401                     const wxTypeInfo * elementType = collType->GetElementType() ;
 402                     while( prop )
 403                     {
 404                         if ( prop->GetName() != wxT("element") )
 405                         {
 406                             wxLogError( _("A non empty collection must consist of 'element' nodes" ) ) ;
 407                             break ;
 408                         }
 409                         wxXmlNode* elementContent = prop->GetChildren() ;
 410                         if ( elementContent )
 411                         {
 412                             // we skip empty elements
 413                             if ( elementType->IsObjectType() )
 414                             {
 415                                 int valueId = ReadComponent( elementContent , callbacks ) ;
 416                                 if ( valueId != wxInvalidObjectID )
 417                                 {
 418                                     if ( pi->GetAccessor()->HasAdder() )
 419                                         callbacks->AddToPropertyCollectionAsObject( objectID , classInfo , pi , valueId ) ;
 420                                     // TODO for collections we must have a notation on taking over ownership or not
 421                                     if ( elementType->GetKind() == wxT_OBJECT && valueId != wxNullObjectID )
 422                                         callbacks->DestroyObject( valueId , GetObjectClassInfo( valueId ) ) ;
 423                                 }
 424                             }
 425                             else
 426                             {
 427                                 wxxVariant elementValue = ReadValue( elementContent , elementType ) ;
 428                                 if ( pi->GetAccessor()->HasAdder() )
 429                                     callbacks->AddToPropertyCollection( objectID , classInfo ,pi , elementValue ) ;
 430                             }
 431                         }
 432                         prop = prop->GetNext() ;
 433                     }
 434                 }
 435                 else if ( pi->GetTypeInfo()->IsObjectType() )
 436                 {
 437                     // and object can either be streamed out a string or as an object
 438                     // in case we have no node, then the object's streaming out has been vetoed
 439                     if ( prop )
 440                     {
 441                         if ( prop->GetName() == wxT("object") )
 442                         {
 443                             int valueId = ReadComponent( prop , callbacks ) ;
 444                             if ( valueId != wxInvalidObjectID )
 445                             {
 446                                 callbacks->SetPropertyAsObject( objectID , classInfo , pi , valueId ) ;
 447                                 if ( pi->GetTypeInfo()->GetKind() == wxT_OBJECT && valueId != wxNullObjectID )
 448                                     callbacks->DestroyObject( valueId , GetObjectClassInfo( valueId ) ) ;
 449                             }
 450                         }
 451                         else
 452                         {
 453                             wxASSERT( pi->GetTypeInfo()->HasStringConverters() ) ;
 454                             wxxVariant nodeval = ReadValue( prop , pi->GetTypeInfo() ) ;
 455                             callbacks->SetProperty( objectID, classInfo ,pi , nodeval ) ;
 456                         }
 457                     }
 458                 }
 459                 else if ( pi->GetTypeInfo()->IsDelegateType() )
 460                 {
 461                     if ( prop )
 462                     {
 463                         wxString resstring = prop->GetContent() ;
 464                         wxInt32 pos = resstring.Find('.') ;
 465                         if ( pos != wxNOT_FOUND )
 466                         {
 467                             int sinkOid = atol(resstring.Left(pos).ToAscii()) ;
 468                             wxString handlerName = resstring.Mid(pos+1) ;
 469                             wxClassInfo* sinkClassInfo = GetObjectClassInfo( sinkOid ) ;
 470
 471                             callbacks->SetConnect( objectID , classInfo , pi , sinkClassInfo ,
 472                                 sinkClassInfo->FindHandlerInfo(handlerName) ,  sinkOid ) ;
 473                         }
 474                         else
 475                         {
 476                             wxLogError( _("incorrect event handler string, missing dot") ) ;
 477                         }
 478                     }
 479
 480                 }
 481                 else
 482                 {
 483                     wxxVariant nodeval = ReadValue( prop , pi->GetTypeInfo() ) ;
 484                     if( pi->GetFlags() & wxPROP_ENUM_STORE_LONG )
 485                     {
 486                         const wxEnumTypeInfo *eti = dynamic_cast<const wxEnumTypeInfo*>( pi->GetTypeInfo() ) ;
 487                         if ( eti )
 488                         {
 489                             long realval ;
 490                             eti->ConvertToLong( nodeval , realval ) ;
 491                             nodeval = wxxVariant( realval ) ;
 492                         }
 493                         else
 494                         {
 495                             wxLogError( _("Type must have enum - long conversion") ) ;
 496                         }
 497                     }
 498                     callbacks->SetProperty( objectID, classInfo ,pi , nodeval ) ;
 499                 }
 500             }
 501         }
 502     }
 503
 504     delete[] createParams ;
 505     delete[] createParamOids ;
 506     delete[] createClassInfos ;
 507
 508     return objectID;
 509 }
 510
 511 wxxVariant wxXmlReader::ReadValue(wxXmlNode *node,
 512                                   const wxTypeInfo *type )
 513 {
 514     wxString content ;
 515     if ( node )
 516         content = node->GetContent() ;
 517     wxxVariant result ;
 518     type->ConvertFromString( content , result ) ;
 519     return result ;
 520 }
 521
 522 int wxXmlReader::ReadObject( const wxString &name , wxDepersister *callbacks)
 523 {
 524     wxXmlNode *iter = m_parent->GetChildren() ;
 525     while ( iter )
 526     {
 527         wxString entryName ;
 528         if ( iter->GetAttribute(wxT("name"), &entryName) )
 529         {
 530             if ( entryName == name )
 531                 return ReadComponent( iter->GetChildren() , callbacks ) ;
 532         }
 533         iter = iter->GetNext() ;
 534     }
 535     return wxInvalidObjectID ;
 536 }
 537
 538 #endif // wxUSE_EXTENDED_RTTI