Function msOGRFileReadTile

mapogr.cpp:2075–2174

/************************************************************************/

int msOGRFileReadTile( layerObj *layer, msOGRFileInfo *psInfo, 
                       int targetTile = -1 )

{
    int nFeatureId;

/* -------------------------------------------------------------------- */
/*      Close old tile if one is open.                                  */
/* -------------------------------------------------------------------- */
    if( psInfo->poCurTile != NULL )
    {
        msOGRFileClose( layer, psInfo->poCurTile );
        psInfo->poCurTile = NULL;
    }

/* -------------------------------------------------------------------- */
/*      If -2 is passed, then seek reset reading of the tileindex.      */
/*      We want to start from the beginning even if this file is        */
/*      shared between layers or renders.                               */
/* -------------------------------------------------------------------- */
    ACQUIRE_OGR_LOCK;
    if( targetTile == -2 )
    {
        OGR_L_ResetReading( psInfo->hLayer );
    }
        
/* -------------------------------------------------------------------- */
/*      Get the name (connection string really) of the next tile.       */
/* -------------------------------------------------------------------- */
    OGRFeatureH hFeature;
    char       *connection = NULL;
    msOGRFileInfo *psTileInfo = NULL;
    int status;

#ifndef IGNORE_MISSING_DATA
  NextFile:
#endif

    if( targetTile < 0 )
        hFeature = OGR_L_GetNextFeature( psInfo->hLayer );
    
    else
        hFeature = OGR_L_GetFeature( psInfo->hLayer, targetTile );

    if( hFeature == NULL )
    {
        RELEASE_OGR_LOCK;
        if( targetTile == -1 )
            return MS_DONE;
        else
            return MS_FAILURE;
        
    }

    connection = msStrdup( OGR_F_GetFieldAsString( hFeature, 
                                                 layer->tileitemindex ));
    
    nFeatureId = OGR_F_GetFID( hFeature );