ogrfmelayer.cpp

GIS系统支持库Geospatial Data Abstraction Library代码.GDAL is a translator library for raster geospatial dat

                eAttrGeomType = wkbPolygon;
            else if( EQUAL(poAttrValue->data(),"fme_rounded_rectangle") )
                eAttrGeomType = wkbPolygon;
            else if( EQUAL(poAttrValue->data(),"fme_line") )
                eAttrGeomType = wkbLineString;
            else if( EQUAL(poAttrValue->data(),"fme_arc") )
                eAttrGeomType = wkbLineString;
            else if( EQUAL(poAttrValue->data(),"fme_aggregate") )
                eAttrGeomType = wkbGeometryCollection;
            else if( EQUAL(poAttrValue->data(),"fme_no_geom") )
                eAttrGeomType = wkbNone;
            else
            {
                CPLDebug( "FME_OLEDB", 
                          "geometry field %s has unknown value %s, ignored.",
                          pszAttrName, 
                          poAttrValue->data() );
                continue;
            }

            if( eGeomType == wkbNone )
                eGeomType = eAttrGeomType;
            else if( eGeomType != eAttrGeomType )
                eGeomType = wkbUnknown;
        }

/* -------------------------------------------------------------------- */
/*      Skip '*' attributes which appear to be the raw attribute        */
/*      names from the source reader.  The versions that don't start    */
/*      with * appear to be massaged suitably for use, with fme         */
/*      standard data types.                                            */
/* -------------------------------------------------------------------- */
        if( EQUALN(pszAttrName,"fme_geometry",12) 
            || pszAttrName[0] == '*'
            || EQUALN(pszAttrName,"fme_geomattr",12) )
        {
            continue;
        }

/* -------------------------------------------------------------------- */
/*      Parse the type into tokens for easier use.                      */
/* -------------------------------------------------------------------- */
        char      **papszTokens;

        papszTokens = CSLTokenizeStringComplex( poAttrValue->data(),
                                                "(,", FALSE, FALSE );

/* -------------------------------------------------------------------- */
/*      Establish new fields.                                           */
/* -------------------------------------------------------------------- */
        OGRFieldType      eType;
        int               nWidth, nPrecision = 0;

        if( CSLCount(papszTokens) == 2 && EQUAL(papszTokens[0],"fme_char") )
        {
            eType = OFTString;
            nWidth = atoi(papszTokens[1]);
        }
        else if( CSLCount(papszTokens) == 3 
                 && EQUAL(papszTokens[0],"fme_decimal") )
        {
            nWidth = atoi(papszTokens[1]);
            nPrecision = atoi(papszTokens[2]);
            if( nPrecision == 0 )
                eType = OFTInteger;
            else
                eType = OFTReal;
        }
        else if( CSLCount(papszTokens) == 1
                 && EQUAL(papszTokens[0],"fme_int16") )
        {
            nWidth = 6;
            nPrecision = 0;
            eType = OFTInteger;
        }
        else if( CSLCount(papszTokens) == 1
                 && EQUAL(papszTokens[0],"fme_int32") )
        {
            nWidth = 0;
            nPrecision = 0;
            eType = OFTInteger;
        }
        else if( CSLCount(papszTokens) == 1
                 && (EQUAL(papszTokens[0],"fme_real32") 
                     || EQUAL(papszTokens[0],"fme_real64")) )
        {
            nWidth = 0;
            nPrecision = 0;
            eType = OFTReal;
        }
        else if( CSLCount(papszTokens) == 1
                 && EQUAL(papszTokens[0],"fme_boolean") )
        {
            nWidth = 1;
            nPrecision = 0;
            eType = OFTInteger;
        }
        else
        {
            printf( "Not able to translate field type: %s\n", 
                    poAttrValue->data() );
            CSLDestroy( papszTokens );
            continue;
        }

/* -------------------------------------------------------------------- */
/*      Add the field to the feature definition.                        */
/* -------------------------------------------------------------------- */
        OGRFieldDefn  oFieldDefn( pszAttrName, eType );
        
        oFieldDefn.SetWidth( nWidth );
        oFieldDefn.SetPrecision( nPrecision );

        poFeatureDefn->AddFieldDefn( &oFieldDefn );

        CSLDestroy( papszTokens );
    }

/* -------------------------------------------------------------------- */
/*      Assign the geometry type ... try to apply 3D-ness as well.      */
/* -------------------------------------------------------------------- */
    if( poSchemaFeature->getDimension() == FME_THREE_D )
        eGeomType = (OGRwkbGeometryType) (((int)eGeomType) | wkb25DBit);

    poFeatureDefn->SetGeomType( eGeomType );

/* -------------------------------------------------------------------- */
/*      Translate the spatial reference system.                         */
/* -------------------------------------------------------------------- */
    if( poSchemaFeature->getCoordSys() != NULL 
        && strlen(poSchemaFeature->getCoordSys()) > 0
        && poSpatialRef == NULL )
    {
        CPLDebug( "FME_OLEDB", "Layer %s has COORDSYS=%s on schema feature.",
                  poFeatureDefn->GetName(), 
                  poSchemaFeature->getCoordSys() );
        poSpatialRef = poDS->FME2OGRSpatialRef(poSchemaFeature->getCoordSys());
    }

/* -------------------------------------------------------------------- */
/*      Cleanup                                                         */
/* -------------------------------------------------------------------- */
    poDS->GetFMESession()->destroyString( poAttrValue );
    poDS->GetFMESession()->destroyStringArray( poAttrNames );

    return TRUE;
}

/************************************************************************/
/*                         SetAttributeFilter()                         */
/************************************************************************/

OGRErr OGRFMELayer::SetAttributeFilter( const char *pszNewFilter )

{
    OGRErr      eErr;

    CPLFree( pszAttributeFilter );
    pszAttributeFilter = NULL;

/* -------------------------------------------------------------------- */
/*      Allow clearing of attribute query.                              */
/* -------------------------------------------------------------------- */
    if( pszNewFilter == NULL || strlen(pszNewFilter) == 0 )
    {
        if( m_poAttrQuery != NULL )
        {
            delete m_poAttrQuery;
            m_poAttrQuery = NULL;
        }
        return OGRERR_NONE;
    }

/* -------------------------------------------------------------------- */
/*      Compile new query.  Note that we currently will only accept     */
/*      queries we recognise as valid.  It would be better to pass      */
/*      directly through to Oracle or other databases where we will     */
/*      use the setConstraints method and let them decide on the        */
/*      validity of the query.  However, it will be difficult to        */
/*      return the error at this point if we defer setting the          */
/*      constraint.                                                     */
/* -------------------------------------------------------------------- */
    if( !m_poAttrQuery )
        m_poAttrQuery = new OGRFeatureQuery();

    eErr = m_poAttrQuery->Compile( GetLayerDefn(), pszNewFilter );
    if( eErr != OGRERR_NONE )
    {
        delete m_poAttrQuery;
        m_poAttrQuery = NULL;
    }
    else
    {
        pszAttributeFilter = CPLStrdup( pszNewFilter );
    }

    ResetReading();
    return eErr;
}

/************************************************************************/
/*                           GetSpatialRef()                            */
/************************************************************************/

OGRSpatialReference *OGRFMELayer::GetSpatialRef()

{
    return poSpatialRef;
}