File: ogrgrass.h

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/******************************************************************************
 * $Id: ogrgrass.h a832da5b936bac8438f9c50e7c20e563fd94c9ff 2020-09-22 13:06:27 +0200 Markus Neteler $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Private definitions for OGR/GRASS driver.
 * Author:   Radim Blazek, radim.blazek@gmail.com
 *
 ******************************************************************************
 * Copyright (c) 2005, Radim Blazek <radim.blazek@gmail.com>
 *
 * 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.
 ****************************************************************************/

#ifndef OGRGRASS_H_INCLUDED
#define OGRGRASS_H_INCLUDED

#include "ogrsf_frmts.h"

extern "C" {
    #include <grass/version.h>
    #include <grass/gprojects.h>
    #include <grass/gis.h>
    #include <grass/dbmi.h>
    #include <grass/vector.h>
}

/************************************************************************/
/*                            OGRGRASSLayer                             */
/************************************************************************/
class OGRGRASSLayer final: public OGRLayer
{
  public:
                        OGRGRASSLayer( int layer, struct Map_info * map );
                        virtual ~OGRGRASSLayer();

    // Layer info
    OGRFeatureDefn *    GetLayerDefn() override { return poFeatureDefn; }
    GIntBig             GetFeatureCount( int ) override;
    OGRErr              GetExtent(OGREnvelope *psExtent, int bForce) override;
    virtual OGRErr      GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce) override
                { return OGRLayer::GetExtent(iGeomField, psExtent, bForce); }
    virtual OGRSpatialReference *GetSpatialRef() override;
    int                 TestCapability( const char * ) override;

    // Reading
    void                ResetReading() override;
    virtual OGRErr      SetNextByIndex( GIntBig nIndex ) override;
    OGRFeature *        GetNextFeature() override;
    OGRFeature         *GetFeature( GIntBig nFeatureId ) override;

    // Filters
    virtual OGRErr      SetAttributeFilter( const char *query ) override;
    virtual void        SetSpatialFilter( OGRGeometry * poGeomIn ) override;
    virtual void        SetSpatialFilter( int iGeomField, OGRGeometry *poGeom ) override
                { OGRLayer::SetSpatialFilter(iGeomField, poGeom); }

  private:
    char                *pszName;
    OGRSpatialReference *poSRS;
    OGRFeatureDefn      *poFeatureDefn;
    char                *pszQuery;      // Attribute filter string

    int                 iNextId;
    int                 nTotalCount;
    int                 iLayer;         // Layer number
    int                 iLayerIndex;    // Layer index (in GRASS category index)
    int                 iCatField;      // Field where category (key) is stored
    int                 nFields;
    int                 *paFeatureIndex; // Array of indexes to category index array

    // Vector map
    struct Map_info     *poMap;
    struct field_info   *poLink;

    // Database connection
    bool                bHaveAttributes;

    dbString            *poDbString;
    dbDriver            *poDriver;
    dbCursor            *poCursor;

    bool                bCursorOpened;  // Sequential database cursor opened
    int                 iCurrentCat;    // Current category in select cursor

    struct line_pnts    *poPoints;
    struct line_cats    *poCats;

    bool                StartDbDriver ();
    bool                StopDbDriver ();

    OGRGeometry         *GetFeatureGeometry ( long nFeatureId, int *cat );
    bool                SetAttributes ( OGRFeature *feature, dbTable *table );

    // Features matching spatial filter for ALL features/elements in GRASS
    char                *paSpatialMatch;
    bool                SetSpatialMatch();

    // Features matching attribute filter for ALL features/elements in GRASS
    char                *paQueryMatch;
    bool                OpenSequentialCursor();
    bool                ResetSequentialCursor();
    bool                SetQueryMatch();
};

/************************************************************************/
/*                          OGRGRASSDataSource                          */
/************************************************************************/
class OGRGRASSDataSource final: public OGRDataSource
{
  public:
                        OGRGRASSDataSource();
                        virtual ~OGRGRASSDataSource();

    int                 Open( const char *, int bUpdate, int bTestOpen,
                              int bSingleNewFile = FALSE );

    const char          *GetName() override { return pszName; }
    int                 GetLayerCount() override { return nLayers; }
    OGRLayer            *GetLayer( int ) override;

    int                 TestCapability( const char * ) override;

  private:
    OGRGRASSLayer     **papoLayers;
    char                *pszName;       // Date source name
    char                *pszGisdbase;   // GISBASE
    char                *pszLocation;   // location name
    char                *pszMapset;     // mapset name
    char                *pszMap;        // name of vector map

    struct Map_info     map;
    int                 nLayers;

    int                 bOpened;

    static bool SplitPath ( char *, char **, char **, char **, char ** );
};

/************************************************************************/
/*                            OGRGRASSDriver                            */
/************************************************************************/
class OGRGRASSDriver final: public OGRSFDriver
{
  public:
                        virtual ~OGRGRASSDriver();

    const char          *GetName() override;
    OGRDataSource       *Open( const char *, int ) override;

    int                 TestCapability( const char * ) override;
};

#endif /* ndef OGRGRASS_H_INCLUDED */