ogrdatasource.cpp

mitab,读取MapInfo的地图文件

/******************************************************************************
 * $Id: ogrdatasource.cpp 10646 2007-01-18 02:38:10Z warmerdam $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The generic portions of the OGRDataSource class.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 1999,  Les Technologies SoftMap Inc.
 *
 * 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 "ogrsf_frmts.h"
#include "ogr_api.h"
#include "ogr_p.h"
#include "ogr_gensql.h"
#include "ogr_attrind.h"

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

/************************************************************************/
/*                           ~OGRDataSource()                           */
/************************************************************************/

OGRDataSource::OGRDataSource()

{
    m_poStyleTable = NULL;
    m_nRefCount = 0;
    m_poDriver = NULL;
}

/************************************************************************/
/*                           ~OGRDataSource()                           */
/************************************************************************/

OGRDataSource::~OGRDataSource()

{
    if ( m_poStyleTable )
    {
        delete m_poStyleTable;
        m_poStyleTable = NULL;
    }
}

/************************************************************************/
/*                         DestroyDataSource()                          */
/************************************************************************/

void OGRDataSource::DestroyDataSource( OGRDataSource *poDS )

{
    delete poDS;
}

/************************************************************************/
/*                           OGR_DS_Destroy()                           */
/************************************************************************/

void OGR_DS_Destroy( OGRDataSourceH hDS )

{
    delete (OGRDataSource *) hDS;
}

/************************************************************************/
/*                              Release()                               */
/************************************************************************/

OGRErr OGRDataSource::Release()

{
    return OGRSFDriverRegistrar::GetRegistrar()->ReleaseDataSource( this );
}

/************************************************************************/
/*                             Reference()                              */
/************************************************************************/

int OGRDataSource::Reference()

{
    return ++m_nRefCount;
}

/************************************************************************/
/*                          OGR_DS_Reference()                          */
/************************************************************************/

int OGR_DS_Reference( OGRDataSourceH hDataSource )

{
    return ((OGRDataSource *) hDataSource)->Reference();
}

/************************************************************************/
/*                            Dereference()                             */
/************************************************************************/

int OGRDataSource::Dereference()

{
    return --m_nRefCount;
}

/************************************************************************/
/*                         OGR_DS_Dereference()                         */
/************************************************************************/

int OGR_DS_Dereference( OGRDataSourceH hDataSource )

{
    return ((OGRDataSource *) hDataSource)->Dereference();
}

/************************************************************************/
/*                            GetRefCount()                             */
/************************************************************************/

int OGRDataSource::GetRefCount() const

{
    return m_nRefCount;
}

/************************************************************************/
/*                         OGR_DS_GetRefCount()                         */
/************************************************************************/

int OGR_DS_GetRefCount( OGRDataSourceH hDataSource )

{
    return ((OGRDataSource *) hDataSource)->GetRefCount();
}

/************************************************************************/
/*                         GetSummaryRefCount()                         */
/************************************************************************/

int OGRDataSource::GetSummaryRefCount() const

{
    int nSummaryCount = m_nRefCount;
    int iLayer;
    OGRDataSource *poUseThis = (OGRDataSource *) this;

    for( iLayer=0; iLayer < poUseThis->GetLayerCount(); iLayer++ )
        nSummaryCount += poUseThis->GetLayer( iLayer )->GetRefCount();

    return nSummaryCount;
}

/************************************************************************/
/*                     OGR_DS_GetSummaryRefCount()                      */
/************************************************************************/

int OGR_DS_GetSummaryRefCount( OGRDataSourceH hDataSource )

{
    return ((OGRDataSource *) hDataSource)->GetSummaryRefCount();
}

/************************************************************************/
/*                            CreateLayer()                             */
/************************************************************************/

OGRLayer *OGRDataSource::CreateLayer( const char * pszName,
                                      OGRSpatialReference * poSpatialRef,
                                      OGRwkbGeometryType eGType,
                                      char **papszOptions )

{
    (void) eGType;
    (void) poSpatialRef;
    (void) pszName;
    (void) papszOptions;

    CPLError( CE_Failure, CPLE_NotSupported,
              "CreateLayer() not supported by this data source." );
              
    return NULL;
}

/************************************************************************/
/*                         OGR_DS_CreateLayer()                         */
/************************************************************************/

OGRLayerH OGR_DS_CreateLayer( OGRDataSourceH hDS, 
                              const char * pszName,
                              OGRSpatialReferenceH hSpatialRef,
                              OGRwkbGeometryType eType,
                              char ** papszOptions )

{
    return ((OGRDataSource *)hDS)->CreateLayer( 
        pszName, (OGRSpatialReference *) hSpatialRef, eType, papszOptions );
}

/************************************************************************/
/*                             CopyLayer()                              */
/************************************************************************/

OGRLayer *OGRDataSource::CopyLayer( OGRLayer *poSrcLayer, 
                                    const char *pszNewName, 
                                    char **papszOptions )

{
    OGRFeatureDefn *poSrcDefn = poSrcLayer->GetLayerDefn();
    OGRLayer *poDstLayer = NULL;

/* -------------------------------------------------------------------- */
/*      Create the layer.                                               */
/* -------------------------------------------------------------------- */
    if( !TestCapability( ODsCCreateLayer ) )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "This datasource does not support creation of layers." );
        return NULL;
    }

    CPLErrorReset();
    poDstLayer = CreateLayer( pszNewName, poSrcLayer->GetSpatialRef(),
                              poSrcDefn->GetGeomType(), papszOptions );
    
    if( poDstLayer == NULL )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Add fields.  Default to copy all field.                         */
/*      If only a subset of all fields requested, then output only      */
/*      the selected fields, and in the order that they were            */
/*      selected.                                                       */
/* -------------------------------------------------------------------- */
    int         iField;
    
    for( iField = 0; iField < poSrcDefn->GetFieldCount(); iField++ )
        poDstLayer->CreateField( poSrcDefn->GetFieldDefn(iField) );

/* -------------------------------------------------------------------- */
/*      Transfer features.                                              */
/* -------------------------------------------------------------------- */
    OGRFeature  *poFeature;
    
    poSrcLayer->ResetReading();

    while( TRUE )
    {
        OGRFeature      *poDstFeature = NULL;

        poFeature = poSrcLayer->GetNextFeature();
        
        if( poFeature == NULL )
            break;

        CPLErrorReset();
        poDstFeature = OGRFeature::CreateFeature( poDstLayer->GetLayerDefn() );

        if( poDstFeature->SetFrom( poFeature, TRUE ) != OGRERR_NONE )
        {
            delete poFeature;
            CPLError( CE_Failure, CPLE_AppDefined,
                      "Unable to translate feature %d from layer %s.\n",
                      poFeature->GetFID(), poSrcDefn->GetName() );
            return poDstLayer;
        }

        poDstFeature->SetFID( poFeature->GetFID() );

        OGRFeature::DestroyFeature( poFeature );

        CPLErrorReset();
        if( poDstLayer->CreateFeature( poDstFeature ) != OGRERR_NONE )
        {
            OGRFeature::DestroyFeature( poDstFeature );
            return poDstLayer;
        }

        OGRFeature::DestroyFeature( poDstFeature );
    }

    return poDstLayer;
}

/************************************************************************/
/*                          OGR_DS_CopyLayer()                          */
/************************************************************************/

OGRLayerH OGR_DS_CopyLayer( OGRDataSourceH hDS, 
                            OGRLayerH hSrcLayer, const char *pszNewName,
                            char **papszOptions )

{
    return ((OGRDataSource *) hDS)->CopyLayer( (OGRLayer *) hSrcLayer,