/**
* @brief Open library
* @param libName - [in] library file name
* @return true - loaded successfully, false otherwise
*/
bool DynamicLibrary::Open( const PDL_CHAR * libName, bool resolveSymbols )
{
if ( !libName ) { return false; }
library_ =
#if PLATFORM_WIN32
::LoadLibraryExA( libName, NULL,
( resolveSymbols ) ? 0 : DONT_RESOLVE_DLL_REFERENCES );
#elif PLATFORM_POSIX
dlopen( libName, RTLD_GLOBAL | ( ( resolveSymbols ) ? RTLD_NOW : RTLD_LAZY ) );
#endif
if ( library_ ) { libraryName_ = libName; }
else
{
const pdl_string nameWithExt( pdl_string( libName ) + pdl_string( GetDefaultExt() ) );
library_ =
#if PLATFORM_WIN32
::LoadLibraryExA( nameWithExt.c_str(), NULL,
( resolveSymbols ) ? 0 : DONT_RESOLVE_DLL_REFERENCES );
#elif PLATFORM_POSIX
dlopen( nameWithExt.c_str(), RTLD_GLOBAL | ( ( resolveSymbols ) ? RTLD_NOW : RTLD_LAZY ) );
#endif
if ( library_ ) { libraryName_ = libName; }
}
return ( library_ );
}
/**
* @brief Get class instance
* @param className - [in] class name
* @return pointer to class instance
*/
DynamicClass * DynamicLibrary::GetInstance( const PDL_CHAR * className )
{
const InstanceMap::iterator loadedInstance( instances_.find( className ) );
if ( loadedInstance != instances_.end() ) { return ( loadedInstance -> second ); }
const pdl_string builderName( pdl_string( "Create" ) + pdl_string( className ) );
// Tricky code to prevent compiler error
// ISO C++ forbids casting between pointer-to-function and pointer-to-object
DynamicBuilder builder = 0;
void * symbol = GetSymbolByName( builderName.c_str() );
( void ) memcpy( &builder, &symbol, sizeof( void * ) );
if ( !builder )
{
instances_[ className ] = 0;
throw LoaderException( pdl_string( "Class `" ) + pdl_string( className ) +
pdl_string( "` not found in " ) + libraryName_ );
}
DynamicClass * instance = ( DynamicClass * )( *builder )();
instances_[ className ] = instance;
return instance;
}
