ogrsdtslayer.cpp

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/******************************************************************************
 * $Id: ogrsdtslayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $
 *
 * Project:  SDTSReader
 * Purpose:  Implements OGRSDTSLayer class.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 1999, Frank Warmerdam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ogr_sdts.h"
#include "cpl_conv.h"
#include "cpl_string.h"

CPL_CVSID("$Id: ogrsdtslayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $");

/************************************************************************/
/*                            OGRSDTSLayer()                            */
/*                                                                      */
/*      Note that the OGRSDTSLayer assumes ownership of the passed      */
/*      OGRFeatureDefn object.                                          */
/************************************************************************/

OGRSDTSLayer::OGRSDTSLayer( SDTSTransfer * poTransferIn, int iLayerIn,
                            OGRSDTSDataSource * poDSIn )

{
    poDS = poDSIn;

    poTransfer = poTransferIn;
    iLayer = iLayerIn;

    poReader = poTransfer->GetLayerIndexedReader( iLayer );

/* -------------------------------------------------------------------- */
/*      Define the feature.                                             */
/* -------------------------------------------------------------------- */
    int         iCATDEntry = poTransfer->GetLayerCATDEntry( iLayer );
    
    poFeatureDefn =
        new OGRFeatureDefn(poTransfer->GetCATD()->GetEntryModule(iCATDEntry));
    poFeatureDefn->Reference();

    OGRFieldDefn oRecId( "RCID", OFTInteger );
    poFeatureDefn->AddFieldDefn( &oRecId );

    if( poTransfer->GetLayerType(iLayer) == SLTPoint )
    {
        poFeatureDefn->SetGeomType( wkbPoint );
    }
    else if( poTransfer->GetLayerType(iLayer) == SLTLine )
    {
        poFeatureDefn->SetGeomType( wkbLineString );

        oRecId.SetName( "SNID" );
        poFeatureDefn->AddFieldDefn( &oRecId );

        oRecId.SetName( "ENID" );
        poFeatureDefn->AddFieldDefn( &oRecId );
    }
    else if( poTransfer->GetLayerType(iLayer) == SLTPoly )
    {
        poFeatureDefn->SetGeomType( wkbPolygon );
    }
    else if( poTransfer->GetLayerType(iLayer) == SLTAttr )
    {
        poFeatureDefn->SetGeomType( wkbNone );
    }

/* -------------------------------------------------------------------- */
/*      Add schema from referenced attribute records.                   */
/* -------------------------------------------------------------------- */
    char        **papszATIDRefs = NULL;
    
    if( poTransfer->GetLayerType(iLayer) != SLTAttr )
        papszATIDRefs = poReader->ScanModuleReferences();
    else
        papszATIDRefs = CSLAddString( papszATIDRefs, 
                                      poTransfer->GetCATD()->GetEntryModule(iCATDEntry) );

    for( int iTable = 0;
         papszATIDRefs != NULL && papszATIDRefs[iTable] != NULL;
         iTable++ )
    {
        SDTSAttrReader  *poAttrReader;
        DDFFieldDefn    *poFDefn;
        
/* -------------------------------------------------------------------- */
/*      Get the attribute table reader, and the associated user         */
/*      attribute field.                                                */
/* -------------------------------------------------------------------- */
        poAttrReader = (SDTSAttrReader *)
            poTransfer->GetLayerIndexedReader(
                poTransfer->FindLayer( papszATIDRefs[iTable] ) );

        if( poAttrReader == NULL )
            continue;

        poFDefn = poAttrReader->GetModule()->FindFieldDefn( "ATTP" );
        if( poFDefn == NULL )
            poFDefn = poAttrReader->GetModule()->FindFieldDefn( "ATTS" );
        if( poFDefn == NULL )
            continue;
        
/* -------------------------------------------------------------------- */
/*      Process each user subfield on the attribute table into an       */
/*      OGR field definition.                                           */
/* -------------------------------------------------------------------- */
        for( int iSF=0; iSF < poFDefn->GetSubfieldCount(); iSF++ )
        {
            DDFSubfieldDefn     *poSFDefn = poFDefn->GetSubfield( iSF );
            int                 nWidth = poSFDefn->GetWidth();
            char                *pszFieldName;

            if( poFeatureDefn->GetFieldIndex( poSFDefn->GetName() ) != -1 )
                pszFieldName = CPLStrdup( CPLSPrintf( "%s_%s",
                                                      papszATIDRefs[iTable],
                                                      poSFDefn->GetName() ) );
            else
                pszFieldName = CPLStrdup( poSFDefn->GetName() );
            
            switch( poSFDefn->GetType() )
            {
              case DDFString:
              {
                  OGRFieldDefn  oStrField( pszFieldName, OFTString );

                  if( nWidth != 0 )
                      oStrField.SetWidth( nWidth );

                  poFeatureDefn->AddFieldDefn( &oStrField );
              }
              break;

              case DDFInt:
              {
                  OGRFieldDefn  oIntField( pszFieldName, OFTInteger );

                  if( nWidth != 0 )
                      oIntField.SetWidth( nWidth );

                  poFeatureDefn->AddFieldDefn( &oIntField );
              }
              break;

              case DDFFloat:
              {
                  OGRFieldDefn  oRealField( pszFieldName, OFTReal );

                  // We don't have a precision in DDF files, so we never even
                  // use the width.  Otherwise with a precision of zero the
                  // result would look like an integer.

                  poFeatureDefn->AddFieldDefn( &oRealField );
              }
              break;

              default:
                break;
            }

            CPLFree( pszFieldName );
            
        } /* next iSF (subfield) */
    } /* next iTable */
    CSLDestroy( papszATIDRefs );
}

/************************************************************************/
/*                           ~OGRSDTSLayer()                           */
/************************************************************************/

OGRSDTSLayer::~OGRSDTSLayer()

{
    if( m_nFeaturesRead > 0 && poFeatureDefn != NULL )
    {
        CPLDebug( "SDTS", "%d features read on layer '%s'.",
                  (int) m_nFeaturesRead, 
                  poFeatureDefn->GetName() );
    }

    if( poFeatureDefn )
        poFeatureDefn->Release();
}

/************************************************************************/
/*                            ResetReading()                            */
/************************************************************************/

void OGRSDTSLayer::ResetReading()

{
    poReader->Rewind();
}

/************************************************************************/
/*                     AssignAttrRecordToFeature()                      */
/************************************************************************/

static void
AssignAttrRecordToFeature( OGRFeature * poFeature, SDTSTransfer * poTransfer, 
                           DDFField * poSR )

{
/* -------------------------------------------------------------------- */
/*      Process each subfield in the record.                            */
/* -------------------------------------------------------------------- */
    DDFFieldDefn        *poFDefn = poSR->GetFieldDefn();
        
    for( int iSF=0; iSF < poFDefn->GetSubfieldCount(); iSF++ )
    {
        DDFSubfieldDefn *poSFDefn = poFDefn->GetSubfield( iSF );
        int                     iField;
        int                     nMaxBytes;
        const char *    pachData = poSR->GetSubfieldData(poSFDefn,
                                                         &nMaxBytes);
/* -------------------------------------------------------------------- */
/*      Indentify this field on the feature.                            */
/* -------------------------------------------------------------------- */
        iField = poFeature->GetFieldIndex( poSFDefn->GetName() );

/* -------------------------------------------------------------------- */
/*      Handle each of the types.                                       */
/* -------------------------------------------------------------------- */