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/****************************************************************
*
* MODULE: v.external
*
* AUTHOR(S): Radim Blazek
*
* PURPOSE: Create a new vector as a link to OGR layer (read-only)
*
* COPYRIGHT: (C) 2003 by the GRASS Development Team
*
* This program is free software under the
* GNU General Public License (>=v2).
* Read the file COPYING that comes with GRASS
* for details.
*
**************************************************************/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "gis.h"
#include "dbmi.h"
#include "Vect.h"
#include "ogr_api.h"
int
main (int argc, char *argv[])
{
int i;
struct GModule *module;
struct Option *dsn_opt, *layer_opt, *out_opt;
char buf[2000];
FILE *fd;
struct Map_info Map;
OGRDataSourceH Ogr_ds;
OGRSFDriverH Ogr_driver;
OGRLayerH Ogr_layer;
OGRFeatureDefnH Ogr_featuredefn;
int nlayers;
int layer;
char *layer_name;
G_gisinit(argv[0]);
OGRRegisterAll();
/* Module options */
sprintf ( buf, "Create a new vector as a read-only link to OGR layer. Available drivers:\n" );
for ( i = 0; i < OGRGetDriverCount(); i++ ) {
Ogr_driver = OGRGetDriver( i );
if ( i == 0)
sprintf (buf, "%s%s", buf, OGR_Dr_GetName ( Ogr_driver) );
else
sprintf (buf, "%s,%s", buf, OGR_Dr_GetName ( Ogr_driver) );
}
module = G_define_module();
module->description = G_store(buf);
dsn_opt = G_define_option();
dsn_opt->key = "dsn";
dsn_opt->type = TYPE_STRING;
dsn_opt->required = YES;
dsn_opt->gisprompt = "file,file,file";
dsn_opt->description = "OGR datasource name.\n"
"\t\tESRI Shapefile: directory containing shapefiles\n"
"\t\tMapInfo File: directory containing mapinfo files";
out_opt = G_define_standard_option(G_OPT_V_OUTPUT);
out_opt->required = NO;
out_opt->description = "Output vector, if not given, available layers are printed only.";
layer_opt = G_define_option();
layer_opt->key = "layer";
layer_opt->type = TYPE_STRING;
layer_opt->required = NO;
layer_opt->multiple = NO;
layer_opt->description = "OGR layer name. If not given, available layers are printed only.\n"
"\t\tESRI Shapefile: shapefile name\n"
"\t\tMapInfo File: mapinfo file name";
if (G_parser (argc, argv)) exit(-1);
if ( !out_opt->answer && layer_opt->answer ) {
G_fatal_error ( "Output vector name was not specified.");
}
/* Open OGR DSN */
Ogr_ds = OGROpen( dsn_opt->answer, FALSE, NULL );
if( Ogr_ds == NULL ) G_fatal_error ("Cannot open data source");
/* Make a list of available layers */
nlayers = OGR_DS_GetLayerCount(Ogr_ds);
if ( !layer_opt->answer )
fprintf ( stdout, "Data source contains %d layers:\n", nlayers );
layer = -1;
for ( i = 0; i < nlayers; i++ ) {
Ogr_layer = OGR_DS_GetLayer( Ogr_ds, i );
Ogr_featuredefn = OGR_L_GetLayerDefn( Ogr_layer );
layer_name = (char *)OGR_FD_GetName( Ogr_featuredefn );
if ( !layer_opt->answer ) {
if ( i > 0 ) fprintf ( stdout, ", " );
fprintf ( stdout, "%s", layer_name );
} else {
if ( strcmp( layer_name, layer_opt->answer) == 0 ) {
layer = i;
}
}
}
if ( !layer_opt->answer ) {
fprintf ( stdout, "\n" );
exit(0) ;
}
if ( layer == -1 ) {
G_fatal_error ("Layer '%s' not available", layer_opt->answer);
}
G_debug (2, "layer '%s' was found", layer_opt->answer );
OGR_DS_Destroy( Ogr_ds );
Vect_open_new (&Map, out_opt->answer, 0 );
Vect_hist_command ( &Map );
Vect_close ( &Map );
/* Vect_open_new created 'head', 'coor', 'hist' -> delete 'coor' and create 'frmt' */
sprintf ( buf, "%s/%s/vector/%s/coor", G_location_path(), G_mapset(), out_opt->answer );
G_debug (2, "Delete '%s'", buf );
if ( unlink(buf) == -1 ) {
G_fatal_error ( "Cannot delete '%s'", buf );
}
/* Create frmt */
sprintf (buf, "%s/%s", GRASS_VECT_DIRECTORY, out_opt->answer );
fd = G_fopen_new (buf, GRASS_VECT_FRMT_ELEMENT);
if ( fd == NULL ) {
G_fatal_error ( "Cannot open 'frmt' file." );
}
fprintf ( fd, "FORMAT: ogr\n" );
fprintf ( fd, "DSN: %s\n", dsn_opt->answer );
fprintf ( fd, "LAYER: %s\n", layer_opt->answer );
fclose ( fd );
Vect_open_old (&Map, out_opt->answer, G_mapset() );
Vect_build ( &Map, stderr );
Vect_close ( &Map );
exit(0) ;
}
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