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/xtistrm.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 #include "wx/xtistrm.h"
  33 #include "wx/xtixml.h"
  34
  35 // STL headers
  36
  37 #include "wx/beforestd.h"
  38 #include <map>
  39 #include <vector>
  40 #include <string>
  41 #include "wx/afterstd.h"
  42
  43 using namespace std;
  44
  45
  46
  47
  48 // ----------------------------------------------------------------------------
  49 // wxObjectXmlWriter
  50 // ----------------------------------------------------------------------------
  51
  52 // convenience functions
  53
  54 void wxXmlAddContentToNode( wxXmlNode* node, const wxString& data )
  55 {
  56     node->AddChild(new wxXmlNode(wxXML_TEXT_NODE, wxT("value"), data ) );
  57 }
  58
  59 wxString wxXmlGetContentFromNode( wxXmlNode *node )
  60 {
  61     if ( node->GetChildren() )
  62         return node->GetChildren()->GetContent();
  63     else
  64         return wxEmptyString;
  65 }
  66
  67 struct wxObjectXmlWriter::wxObjectXmlWriterInternal
  68 {
  69     wxXmlNode *m_root;
  70     wxXmlNode *m_current;
  71     vector< wxXmlNode * > m_objectStack;
  72
  73     void Push( wxXmlNode *newCurrent )
  74     {
  75         m_objectStack.push_back( m_current );
  76         m_current = newCurrent;
  77     }
  78
  79     void Pop()
  80     {
  81         m_current = m_objectStack.back();
  82         m_objectStack.pop_back();
  83     }
  84 };
  85
  86 wxObjectXmlWriter::wxObjectXmlWriter( wxXmlNode * rootnode )
  87 {
  88     m_data = new wxObjectXmlWriterInternal();
  89     m_data->m_root = rootnode;
  90     m_data->m_current = rootnode;
  91 }
  92
  93 wxObjectXmlWriter::~wxObjectXmlWriter()
  94 {
  95     delete m_data;
  96 }
  97
  98 void wxObjectXmlWriter::DoBeginWriteTopLevelEntry( const wxString &name )
  99 {
 100     wxXmlNode *pnode;
 101     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("entry"));
 102     pnode->AddProperty(wxString(wxT("name")), name);
 103     m_data->m_current->AddChild(pnode);
 104     m_data->Push( pnode );
 105 }
 106
 107 void wxObjectXmlWriter::DoEndWriteTopLevelEntry( const wxString &WXUNUSED(name) )
 108 {
 109     m_data->Pop();
 110 }
 111
 112 void wxObjectXmlWriter::DoBeginWriteObject(const wxObject *WXUNUSED(object),
 113                                      const wxClassInfo *classInfo,
 114                                      int objectID, const wxStringToAnyHashMap &metadata   )
 115 {
 116     wxXmlNode *pnode;
 117     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 118     pnode->AddProperty(wxT("class"), wxString(classInfo->GetClassName()));
 119     pnode->AddProperty(wxT("id"), wxString::Format( wxT("%d"), objectID ) );
 120
 121     wxStringToAnyHashMap::const_iterator it, en;
 122     for( it = metadata.begin(), en = metadata.end(); it != en; ++it )
 123     {
 124         pnode->AddProperty( it->first, wxAnyGetAsString(it->second) );
 125     }
 126
 127     m_data->m_current->AddChild(pnode);
 128     m_data->Push( pnode );
 129 }
 130
 131 void wxObjectXmlWriter::DoEndWriteObject(const wxObject *WXUNUSED(object),
 132                                    const wxClassInfo *WXUNUSED(classInfo),
 133                                    int WXUNUSED(objectID) )
 134 {
 135     m_data->Pop();
 136 }
 137
 138 void wxObjectXmlWriter::DoWriteSimpleType( const wxAny &value )
 139 {
 140     wxXmlAddContentToNode( m_data->m_current,wxAnyGetAsString(value) );
 141 }
 142
 143 void wxObjectXmlWriter::DoBeginWriteElement()
 144 {
 145     wxXmlNode *pnode;
 146     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("element") );
 147     m_data->m_current->AddChild(pnode);
 148     m_data->Push( pnode );
 149 }
 150
 151 void wxObjectXmlWriter::DoEndWriteElement()
 152 {
 153     m_data->Pop();
 154 }
 155
 156 void wxObjectXmlWriter::DoBeginWriteProperty(const wxPropertyInfo *pi )
 157 {
 158     wxXmlNode *pnode;
 159     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("prop") );
 160     pnode->AddProperty(wxT("name"), pi->GetName() );
 161     m_data->m_current->AddChild(pnode);
 162     m_data->Push( pnode );
 163 }
 164
 165 void wxObjectXmlWriter::DoEndWriteProperty(const wxPropertyInfo *WXUNUSED(propInfo) )
 166 {
 167     m_data->Pop();
 168 }
 169
 170 void wxObjectXmlWriter::DoWriteRepeatedObject( int objectID )
 171 {
 172     wxXmlNode *pnode;
 173     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 174     pnode->AddProperty(wxString(wxT("href")), wxString::Format( wxT("%d"), objectID ) );
 175     m_data->m_current->AddChild(pnode);
 176 }
 177
 178 void wxObjectXmlWriter::DoWriteNullObject()
 179 {
 180     wxXmlNode *pnode;
 181     pnode = new wxXmlNode(wxXML_ELEMENT_NODE, wxT("object"));
 182     m_data->m_current->AddChild(pnode);
 183 }
 184
 185 void wxObjectXmlWriter::DoWriteDelegate( const wxObject *WXUNUSED(object),
 186                                    const wxClassInfo* WXUNUSED(classInfo),
 187                                    const wxPropertyInfo *WXUNUSED(pi),
 188                                    const wxObject *eventSink, int sinkObjectID,
 189                                    const wxClassInfo* WXUNUSED(eventSinkClassInfo),
 190                                    const wxHandlerInfo* handlerInfo )
 191 {
 192     if ( eventSink != NULL && handlerInfo != NULL )
 193     {
 194         wxXmlAddContentToNode( m_data->m_current,
 195             wxString::Format(wxT("%d.%s"), sinkObjectID, handlerInfo->GetName().c_str()) );
 196     }
 197 }
 198
 199
 200 // ----------------------------------------------------------------------------
 201 // wxObjectXmlReader
 202 // ----------------------------------------------------------------------------
 203
 204 /*
 205 Reading components has not to be extended for components
 206 as properties are always sought by typeinfo over all levels
 207 and create params are always toplevel class only
 208 */
 209
 210 int wxObjectXmlReader::ReadComponent(wxXmlNode *node, wxObjectReaderCallback *callbacks)
 211 {
 212     wxASSERT_MSG( callbacks, wxT("Does not support reading without a Depersistor") );
 213     wxString className;
 214     wxClassInfo *classInfo;
 215
 216     wxAny *createParams;
 217     int *createParamOids;
 218     const wxClassInfo** createClassInfos;
 219     wxXmlNode *children;
 220     int objectID;
 221     wxString ObjectIdString;
 222
 223     children = node->GetChildren();
 224     if (!children)
 225     {
 226         // check for a null object or href
 227         if (node->GetAttribute(wxT("href"), &ObjectIdString ) )
 228         {
 229             objectID = atoi( ObjectIdString.ToAscii() );
 230             if ( HasObjectClassInfo( objectID ) )
 231             {
 232                 return objectID;
 233             }
 234             else
 235             {
 236                 wxLogError( _("Forward hrefs are not supported") );
 237                 return wxInvalidObjectID;
 238             }
 239         }
 240         if ( !node->GetAttribute(wxT("id"), &ObjectIdString ) )
 241         {
 242             return wxNullObjectID;
 243         }
 244     }
 245     if (!node->GetAttribute(wxT("class"), &className))
 246     {
 247         // No class name.  Eek. FIXME: error handling
 248         return wxInvalidObjectID;
 249     }
 250
 251     classInfo = wxClassInfo::FindClass(className);
 252     if ( classInfo == NULL )
 253     {
 254         wxLogError( wxString::Format(_("unknown class %s"),className ) );
 255         return wxInvalidObjectID;
 256     }
 257
 258     if ( children != NULL && children->GetType() == wxXML_TEXT_NODE )
 259     {
 260         wxLogError(_("objects cannot have XML Text Nodes") );
 261         return wxInvalidObjectID;
 262     }
 263     if (!node->GetAttribute(wxT("id"), &ObjectIdString))
 264     {
 265         wxLogError(_("Objects must have an id attribute") );
 266         // No object id.  Eek. FIXME: error handling
 267         return wxInvalidObjectID;
 268     }
 269     objectID = atoi( ObjectIdString.ToAscii() );
 270
 271     // is this object already has been streamed in, return it here
 272     if ( HasObjectClassInfo( objectID ) )
 273     {
 274         wxLogError ( wxString::Format(_("Doubly used id : %d"), objectID ) );
 275         return wxInvalidObjectID;
 276     }
 277
 278     // new object, start with allocation
 279     // first make the object know to our internal registry
 280     SetObjectClassInfo( objectID, classInfo );
 281
 282     wxStringToAnyHashMap metadata;
 283     wxXmlProperty *xp = node->GetAttributes();
 284     while ( xp )
 285     {
 286         if ( xp->GetName() != wxString(wxT("class")) &&
 287              xp->GetName() != wxString(wxT("id")) )
 288         {
 289             metadata[xp->GetName()] = wxAny( xp->GetValue() );
 290         }
 291         xp = xp->GetNext();
 292     }
 293     if ( !classInfo->NeedsDirectConstruction() )
 294         callbacks->AllocateObject(objectID, classInfo, metadata);
 295
 296     //
 297     // stream back the Create parameters first
 298     createParams = new wxAny[ classInfo->GetCreateParamCount() ];
 299     createParamOids = new int[classInfo->GetCreateParamCount() ];
 300     createClassInfos = new const wxClassInfo*[classInfo->GetCreateParamCount() ];
 301
 302 #if wxUSE_UNICODE
 303     typedef map<wstring, wxXmlNode *> PropertyNodes;
 304     typedef vector<wstring> PropertyNames;
 305 #else
 306     typedef map<string, wxXmlNode *> PropertyNodes;
 307     typedef vector<string> PropertyNames;
 308 #endif
 309     PropertyNodes propertyNodes;
 310     PropertyNames propertyNames;
 311
 312     while( children )
 313     {
 314         wxString name;
 315         children->GetAttribute( wxT("name"), &name );
 316         propertyNames.push_back( (const wxChar*)name.c_str() );
 317         propertyNodes[(const wxChar*)name.c_str()] = children->GetChildren();
 318         children = children->GetNext();
 319     }
 320
 321     for ( int i = 0; i <classInfo->GetCreateParamCount(); ++i )
 322     {
 323         const wxChar* paramName = classInfo->GetCreateParamName(i);
 324         PropertyNodes::iterator propiter = propertyNodes.find( paramName );
 325         const wxPropertyInfo* pi = classInfo->FindPropertyInfo( paramName );
 326         if ( pi == 0 )
 327         {
 328             wxLogError( wxString::Format(_("Unkown Property %s"),paramName) );
 329         }
 330         // if we don't have the value of a create param set in the xml
 331         // we use the default value
 332         if ( propiter != propertyNodes.end() )
 333         {
 334             wxXmlNode* prop = propiter->second;
 335             if ( pi->GetTypeInfo()->IsObjectType() )
 336             {
 337                 createParamOids[i] = ReadComponent( prop, callbacks );
 338                 createClassInfos[i] =
 339                     wx_dynamic_cast(const wxClassTypeInfo*, pi->GetTypeInfo())->GetClassInfo();
 340             }
 341             else
 342             {
 343                 createParamOids[i] = wxInvalidObjectID;
 344                 createParams[i] = ReadValue( prop, pi->GetTypeInfo() );
 345                 if( pi->GetFlags() & wxPROP_ENUM_STORE_LONG )
 346                 {
 347                     const wxEnumTypeInfo *eti =
 348                         wx_dynamic_cast(const wxEnumTypeInfo*, pi->GetTypeInfo() );
 349                     if ( eti )
 350                     {
 351                         long realval;
 352                         eti->ConvertToLong( createParams[i], realval );
 353                         createParams[i] = wxAny( realval );
 354                     }
 355                     else
 356                     {
 357                         wxLogError( _("Type must have enum - long conversion") );
 358                     }
 359                 }
 360                 createClassInfos[i] = NULL;
 361             }
 362
 363             for ( size_t j = 0; j < propertyNames.size(); ++j )
 364             {
 365                 if ( propertyNames[j] == paramName )
 366                 {
 367                     propertyNames[j] = wxEmptyString;
 368                     break;
 369                 }
 370             }
 371         }
 372         else
 373         {
 374             if ( pi->GetTypeInfo()->IsObjectType() )
 375             {
 376                 createParamOids[i] = wxNullObjectID;
 377                 createClassInfos[i] =
 378                     wx_dynamic_cast(const wxClassTypeInfo*, pi->GetTypeInfo())->GetClassInfo();
 379             }
 380             else
 381             {
 382                 createParams[i] = pi->GetDefaultValue();
 383                 createParamOids[i] = wxInvalidObjectID;
 384             }
 385         }
 386     }
 387
 388     // got the parameters.  Call the Create method
 389     if ( classInfo->NeedsDirectConstruction() )
 390         callbacks->ConstructObject(objectID, classInfo,
 391             classInfo->GetCreateParamCount(),
 392             createParams, createParamOids, createClassInfos, metadata );
 393     else
 394         callbacks->CreateObject(objectID, classInfo,
 395             classInfo->GetCreateParamCount(),
 396             createParams, createParamOids, createClassInfos, metadata );
 397
 398     // now stream in the rest of the properties, in the sequence their
 399     // properties were written in the xml
 400     for ( size_t j = 0; j < propertyNames.size(); ++j )
 401     {
 402         if ( !propertyNames[j].empty() )
 403         {
 404             PropertyNodes::iterator propiter = propertyNodes.find( propertyNames[j] );
 405             if ( propiter != propertyNodes.end() )
 406             {
 407                 wxXmlNode* prop = propiter->second;
 408                 const wxPropertyInfo* pi =
 409                     classInfo->FindPropertyInfo( propertyNames[j].c_str() );
 410                 if ( pi->GetTypeInfo()->GetKind() == wxT_COLLECTION )
 411                 {
 412                     const wxCollectionTypeInfo* collType =
 413                         wx_dynamic_cast( const wxCollectionTypeInfo*, pi->GetTypeInfo() );
 414                     const wxTypeInfo * elementType = collType->GetElementType();
 415                     while( prop )
 416                     {
 417                         if ( prop->GetName() != wxT("element") )
 418                         {
 419                             wxLogError( _("A non empty collection must consist of 'element' nodes" ) );
 420                             break;
 421                         }
 422
 423                         wxXmlNode* elementContent = prop->GetChildren();
 424                         if ( elementContent )
 425                         {
 426                             // we skip empty elements
 427                             if ( elementType->IsObjectType() )
 428                             {
 429                                 int valueId = ReadComponent( elementContent, callbacks );
 430                                 if ( valueId != wxInvalidObjectID )
 431                                 {
 432                                     if ( pi->GetAccessor()->HasAdder() )
 433                                         callbacks->AddToPropertyCollectionAsObject( objectID, classInfo, pi, valueId );
 434                                     // TODO for collections we must have a notation on taking over ownership or not
 435                                     if ( elementType->GetKind() == wxT_OBJECT && valueId != wxNullObjectID )
 436                                         callbacks->DestroyObject( valueId, GetObjectClassInfo( valueId ) );
 437                                 }
 438                             }
 439                             else
 440                             {
 441                                 wxAny elementValue = ReadValue( elementContent, elementType );
 442                                 if ( pi->GetAccessor()->HasAdder() )
 443                                     callbacks->AddToPropertyCollection( objectID, classInfo,pi, elementValue );
 444                             }
 445                         }
 446                         prop = prop->GetNext();
 447                     }
 448                 }
 449                 else if ( pi->GetTypeInfo()->IsObjectType() )
 450                 {
 451                     // and object can either be streamed out a string or as an object
 452                     // in case we have no node, then the object's streaming out has been vetoed
 453                     if ( prop )
 454                     {
 455                         if ( prop->GetName() == wxT("object") )
 456                         {
 457                             int valueId = ReadComponent( prop, callbacks );
 458                             if ( valueId != wxInvalidObjectID )
 459                             {
 460                                 callbacks->SetPropertyAsObject( objectID, classInfo, pi, valueId );
 461                                 if ( pi->GetTypeInfo()->GetKind() == wxT_OBJECT && valueId != wxNullObjectID )
 462                                     callbacks->DestroyObject( valueId, GetObjectClassInfo( valueId ) );
 463                             }
 464                         }
 465                         else
 466                         {
 467                             wxASSERT( pi->GetTypeInfo()->HasStringConverters() );
 468                             wxAny nodeval = ReadValue( prop, pi->GetTypeInfo() );
 469                             callbacks->SetProperty( objectID, classInfo,pi, nodeval );
 470                         }
 471                     }
 472                 }
 473                 else if ( pi->GetTypeInfo()->IsDelegateType() )
 474                 {
 475                     if ( prop )
 476                     {
 477                         wxString resstring = prop->GetContent();
 478                         wxInt32 pos = resstring.Find('.');
 479                         if ( pos != wxNOT_FOUND )
 480                         {
 481                             int sinkOid = atol(resstring.Left(pos).ToAscii());
 482                             wxString handlerName = resstring.Mid(pos+1);
 483                             wxClassInfo* sinkClassInfo = GetObjectClassInfo( sinkOid );
 484
 485                             callbacks->SetConnect( objectID, classInfo, pi, sinkClassInfo,
 486                                 sinkClassInfo->FindHandlerInfo(handlerName.c_str()),  sinkOid );
 487                         }
 488                         else
 489                         {
 490                             wxLogError( _("incorrect event handler string, missing dot") );
 491                         }
 492                     }
 493
 494                 }
 495                 else
 496                 {
 497                     wxAny nodeval = ReadValue( prop, pi->GetTypeInfo() );
 498                     if( pi->GetFlags() & wxPROP_ENUM_STORE_LONG )
 499                     {
 500                         const wxEnumTypeInfo *eti =
 501                             wx_dynamic_cast(const wxEnumTypeInfo*, pi->GetTypeInfo() );
 502                         if ( eti )
 503                         {
 504                             long realval;
 505                             eti->ConvertToLong( nodeval, realval );
 506                             nodeval = wxAny( realval );
 507                         }
 508                         else
 509                         {
 510                             wxLogError( _("Type must have enum - long conversion") );
 511                         }
 512                     }
 513                     callbacks->SetProperty( objectID, classInfo,pi, nodeval );
 514                 }
 515             }
 516         }
 517     }
 518
 519     delete[] createParams;
 520     delete[] createParamOids;
 521     delete[] createClassInfos;
 522
 523     return objectID;
 524 }
 525
 526 wxAny wxObjectXmlReader::ReadValue(wxXmlNode *node,
 527                                   const wxTypeInfo *type )
 528 {
 529     wxString content;
 530     if ( node )
 531         content = node->GetContent();
 532     wxAny result;
 533     type->ConvertFromString( content, result );
 534     return result;
 535 }
 536
 537 int wxObjectXmlReader::ReadObject( const wxString &name, wxObjectReaderCallback *callbacks)
 538 {
 539     wxXmlNode *iter = m_parent->GetChildren();
 540     while ( iter )
 541     {
 542         wxString entryName;
 543         if ( iter->GetAttribute(wxT("name"), &entryName) )
 544         {
 545             if ( entryName == name )
 546                 return ReadComponent( iter->GetChildren(), callbacks );
 547         }
 548         iter = iter->GetNext();
 549     }
 550     return wxInvalidObjectID;
 551 }
 552
 553 #endif // wxUSE_EXTENDED_RTTI