xtistrm.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        src/common/xtistrm.cpp
// Purpose:     streaming runtime metadata information
// Author:      Stefan Csomor
// Modified by:
// Created:     27/07/03
// RCS-ID:      $Id: xtistrm.cpp,v 1.25 2004/09/24 14:32:35 ABX Exp $
// Copyright:   (c) 2003 Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "xtistrm.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/hash.h"
#include "wx/object.h"
#endif

#include "wx/tokenzr.h"
#include "wx/txtstrm.h"
#include "wx/event.h"

#if wxUSE_EXTENDED_RTTI

#include "wx/xtistrm.h"

#include "wx/beforestd.h"
#include <map>
#include <vector>
#include <string>
#include "wx/afterstd.h"

using namespace std ;

struct wxWriter::wxWriterInternal
{
    map< const wxObject* , int > m_writtenObjects ;
    int m_nextId ;
} ;

wxWriter::wxWriter()
{
    m_data = new wxWriterInternal ;
    m_data->m_nextId = 0 ;
}

wxWriter::~wxWriter()
{
    delete m_data ;
}

struct wxWriter::wxWriterInternalPropertiesData
{
    char nothing ;
} ;

void wxWriter::ClearObjectContext()
{
    delete m_data ;
    m_data = new wxWriterInternal() ;
    m_data->m_nextId = 0 ;
}

void wxWriter::WriteObject(const wxObject *object, const wxClassInfo *classInfo , wxPersister *persister , const wxString &name , wxxVariantArray &metadata )
{
    DoBeginWriteTopLevelEntry( name ) ;
    WriteObject( object , classInfo , persister , false , metadata) ;
    DoEndWriteTopLevelEntry( name ) ;
}

void wxWriter::WriteObject(const wxObject *object, const wxClassInfo *classInfo , wxPersister *persister , bool isEmbedded, wxxVariantArray &metadata )
{
    if ( !classInfo->BeforeWriteObject( object , this , persister , metadata) )
        return ;

    if ( persister->BeforeWriteObject( this , object , classInfo , metadata) )
    {
        if ( object == NULL )
            DoWriteNullObject() ;
        else if ( IsObjectKnown( object ) )
            DoWriteRepeatedObject( GetObjectID(object) ) ;
        else
        {
            int oid = m_data->m_nextId++ ;
            if ( !isEmbedded )
                m_data->m_writtenObjects[object] = oid ;

            // in case this object is a wxDynamicObject we also have to insert is superclass
            // instance with the same id, so that object relations are streamed out correctly
            const wxDynamicObject* dynobj = dynamic_cast<const wxDynamicObject *>( object ) ;
            if ( !isEmbedded && dynobj )
                m_data->m_writtenObjects[dynobj->GetSuperClassInstance()] = oid ;

            DoBeginWriteObject( object , classInfo , oid , metadata ) ;
            wxWriterInternalPropertiesData data ;
            WriteAllProperties( object , classInfo , persister , &data ) ;
            DoEndWriteObject( object , classInfo , oid  ) ;
        }
        persister->AfterWriteObject( this ,object , classInfo ) ;
    }
}

void wxWriter::FindConnectEntry(const wxEvtHandler * evSource,const wxDelegateTypeInfo* dti, const wxObject* &sink , const wxHandlerInfo *&handler)
{
    wxList *dynamicEvents = evSource->GetDynamicEventTable() ;

    if ( dynamicEvents )
    {
        wxList::compatibility_iterator node = dynamicEvents->GetFirst();
        while (node)
        {
            wxDynamicEventTableEntry *entry = (wxDynamicEventTableEntry*)node->GetData();

            // find the match
            if ( entry->m_fn &&
                (dti->GetEventType() == entry->m_eventType) &&
                (entry->m_id == -1 ) &&
                (entry->m_eventSink != NULL ) )
            {
                sink = entry->m_eventSink ;
                const wxClassInfo* sinkClassInfo = sink->GetClassInfo() ;
                const wxHandlerInfo* sinkHandler = sinkClassInfo->GetFirstHandler() ;
                while ( sinkHandler )
                {
                    if ( sinkHandler->GetEventFunction() == entry->m_fn )
                    {
                        handler = sinkHandler ;
                        break ;
                    }
                    sinkHandler = sinkHandler->GetNext() ;
                }
                break ;
            }
            node = node->GetNext();
        }
    }
}
void wxWriter::WriteAllProperties( const wxObject * obj , const wxClassInfo* ci , wxPersister *persister, wxWriterInternalPropertiesData * data )
{
    wxPropertyInfoMap map ;
    ci->GetProperties( map ) ;
    for ( int i = 0 ; i < ci->GetCreateParamCount() ; ++i )
    {
        wxString name = ci->GetCreateParamName(i) ;
        const wxPropertyInfo* prop = map.find(name)->second ;
        if ( prop )
        {
            WriteOneProperty( obj , prop->GetDeclaringClass() , prop , persister , data ) ;
        }
        else
        {
            wxLogError( _("Create Parameter not found in declared RTTI Parameters") ) ;
        }
        map.erase( name ) ;
    }
    { // Extra block for broken compilers
        for( wxPropertyInfoMap::iterator iter = map.begin() ; iter != map.end() ; ++iter )
        {
            const wxPropertyInfo* prop = iter->second ;
            if ( prop->GetFlags() & wxPROP_OBJECT_GRAPH )
            {
                WriteOneProperty( obj , prop->GetDeclaringClass() , prop , persister , data ) ;
            }
        }
    }
    { // Extra block for broken compilers
        for( wxPropertyInfoMap::iterator iter = map.begin() ; iter != map.end() ; ++iter )
        {
            const wxPropertyInfo* prop = iter->second ;
            if ( !(prop->GetFlags() & wxPROP_OBJECT_GRAPH) )
            {
                WriteOneProperty( obj , prop->GetDeclaringClass() , prop , persister , data ) ;
            }
        }
    }
}

void wxWriter::WriteOneProperty( const wxObject *obj , const wxClassInfo* ci , const wxPropertyInfo* pi , wxPersister *persister , wxWriterInternalPropertiesData *WXUNUSED(data) )
{
    if ( pi->GetFlags() & wxPROP_DONT_STREAM )
        return ;

    // make sure that we are picking the correct object for accessing the property
    const wxDynamicObject* dynobj = dynamic_cast< const wxDynamicObject* > (obj ) ;
    if ( dynobj && (dynamic_cast<const wxDynamicClassInfo*>(ci) == NULL) )
        obj = dynobj->GetSuperClassInstance() ;

    if ( pi->GetTypeInfo()->GetKind() == wxT_COLLECTION )
    {
        wxxVariantArray data ;
        pi->GetAccessor()->GetPropertyCollection(obj, data) ;
        const wxTypeInfo * elementType = dynamic_cast< const wxCollectionTypeInfo* >( pi->GetTypeInfo() )->GetElementType() ;
        for ( size_t i = 0 ; i < data.GetCount() ; ++i )
        {
            if ( i == 0 )
                DoBeginWriteProperty( pi ) ;

            DoBeginWriteElement() ;
            wxxVariant value = data[i] ;
            if ( persister->BeforeWriteProperty( this , obj, pi , value ) )
            {
                const wxClassTypeInfo* cti = dynamic_cast< const wxClassTypeInfo* > ( elementType ) ;
                if ( cti )
                {
                    const wxClassInfo* pci = cti->GetClassInfo() ;
                    wxObject *vobj = pci->VariantToInstance( value ) ;
                    wxxVariantArray md ;
                    WriteObject( vobj , (vobj ? vobj->GetClassInfo() : pci ) , persister , cti->GetKind()== wxT_OBJECT , md ) ;
                }
                else
                {
                    DoWriteSimpleType( value ) ;
                }
            }
            DoEndWriteElement() ;
            if ( i == data.GetCount() - 1 )
                 DoEndWriteProperty( pi ) ;
       }
   }
    else
    {
        const wxDelegateTypeInfo* dti = dynamic_cast< const wxDelegateTypeInfo* > ( pi->GetTypeInfo() ) ;
        if ( dti )
        {
            const wxObject* sink = NULL ;
            const wxHandlerInfo *handler = NULL ;

            const wxEvtHandler * evSource = dynamic_cast<const wxEvtHandler *>(obj) ;
            if ( evSource )
            {
                FindConnectEntry( evSource , dti , sink , handler ) ;
                if ( persister->BeforeWriteDelegate( this , obj , ci , pi , sink , handler ) )
                {
                    if ( sink != NULL && handler != NULL )
                    {
                        DoBeginWriteProperty( pi ) ;
                        if ( IsObjectKnown( sink ) )
                        {
                            DoWriteDelegate( obj , ci , pi , sink , GetObjectID( sink ) , sink->GetClassInfo() , handler ) ;
                            DoEndWriteProperty( pi ) ;
                        }
                        else
                        {
                            wxLogError( _("Streaming delegates for not already streamed objects not yet supported") ) ;
                        }
                    }
                }
            }
            else
            {
                wxLogError(_("Illegal Object Class (Non-wxEvtHandler) as Event Source") ) ;
            }
        }
        else
        {
            wxxVariant value ;
            pi->GetAccessor()->GetProperty(obj, value) ;

            // avoid streaming out void objects
            if( value.IsEmpty() )
                return ;

            if ( pi->GetFlags() & wxPROP_ENUM_STORE_LONG )
            {
                const wxEnumTypeInfo *eti = dynamic_cast<const wxEnumTypeInfo*>( pi->GetTypeInfo() ) ;
                if ( eti )
                {
                    eti->ConvertFromLong( value.wxTEMPLATED_MEMBER_CALL(Get , long) , value ) ;
                }
                else
                {
                    wxLogError( _("Type must have enum - long conversion") ) ;
                }
            }