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/****************************************************************
*
* MODULE: v.external
*
* AUTHOR(S): Radim Blazek
* Updated to GRASS 7 by Martin Landa <landa.martin gmail.com>
*
* PURPOSE: Create a new vector as a link to OGR layer
*
* COPYRIGHT: (C) 2003-2011 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/vector.h>
#include <grass/glocale.h>
#include <ogr_api.h>
#include "local_proto.h"
int main(int argc, char *argv[])
{
struct GModule *module;
struct _options options;
struct _flags flags;
struct Map_info Map;
FILE *fd;
int ilayer, use_ogr;
char buf[GPATH_MAX], *dsn;
const char *output;
G_gisinit(argv[0]);
module = G_define_module();
G_add_keyword(_("vector"));
G_add_keyword(_("import"));
G_add_keyword(_("external"));
G_add_keyword("OGR");
G_add_keyword("PostGIS");
module->description = _("Creates a new pseudo-vector map as a link to an OGR-supported layer "
"or a PostGIS feature table.");
parse_args(argc, argv,
&options, &flags);
use_ogr = TRUE;
G_debug(1, "GRASS_VECTOR_OGR defined? %s",
getenv("GRASS_VECTOR_OGR") ? "yes" : "no");
if(options.dsn->answer &&
G_strncasecmp(options.dsn->answer, "PG:", 3) == 0) {
/* -> PostgreSQL */
#if defined HAVE_OGR && defined HAVE_POSTGRES
if (getenv("GRASS_VECTOR_OGR"))
use_ogr = TRUE;
else
use_ogr = FALSE;
#else
#ifdef HAVE_POSTGRES
if (getenv("GRASS_VECTOR_OGR"))
G_warning(_("Environment variable GRASS_VECTOR_OGR defined, "
"but GRASS is compiled with OGR support. "
"Using GRASS-PostGIS data driver instead."));
use_ogr = FALSE;
#else /* -> force using OGR */
G_warning(_("GRASS is not compiled with PostgreSQL support. "
"Using OGR-PostgreSQL driver instead of native "
"GRASS-PostGIS data driver."));
use_ogr = TRUE;
#endif /* HAVE_POSTRES */
#endif /* HAVE_OGR && HAVE_POSTGRES */
}
#ifdef HAVE_OGR
if (use_ogr)
OGRRegisterAll();
#endif
if (flags.format->answer) {
/* list formats */
list_formats(stdout);
exit(EXIT_SUCCESS);
}
/* be friendly, ignored 'PG:' prefix for PostGIS links */
dsn = NULL;
if (options.dsn->answer) {
if (!use_ogr) {
int i, length;
length = strlen(options.dsn->answer);
dsn = (char *) G_malloc(length - 3);
for (i = 3; i < length; i++)
dsn[i-3] = options.dsn->answer[i];
dsn[length-3] = '\0';
}
else {
dsn = G_store(options.dsn->answer);
}
}
if (flags.list->answer || flags.tlist->answer) {
/* list layers */
if (!dsn)
G_fatal_error(_("Required parameter <%s> not set"), options.dsn->key);
list_layers(stdout, dsn, NULL,
flags.tlist->answer ? TRUE : FALSE, use_ogr);
exit(EXIT_SUCCESS);
}
/* define name for output */
if (!options.output->answer)
output = options.layer->answer;
else
output = options.output->answer;
/* get layer index */
ilayer = list_layers(NULL, dsn, options.layer->answer,
FALSE, use_ogr);
if (ilayer == -1) {
G_fatal_error(_("Layer <%s> not available"), options.layer->answer);
}
G_debug(2, "layer '%s' was found", options.layer->answer);
if (G_find_vector2(output, G_mapset()) && !G_check_overwrite(argc, argv)) {
G_fatal_error(_("option <%s>: <%s> exists."),
options.output->key, output);
}
/* create new vector map */
putenv("GRASS_VECTOR_EXTERNAL_IGNORE=1");
if (Vect_open_new(&Map, output, WITHOUT_Z) < 0) /* dimension is set later from data source */
G_fatal_error(_("Unable to create vector map <%s>"), output);
Vect_set_error_handler_io(NULL, &Map);
Vect_hist_command(&Map);
Vect_close(&Map);
/* Vect_open_new created 'head', 'coor', 'hist'
-> delete 'coor' and create 'frmt' */
sprintf(buf, "%s/%s/%s/%s/coor", G_location_path(), G_mapset(),
GV_DIRECTORY, output);
G_debug(2, "Delete '%s'", buf);
if (unlink(buf) == -1) {
G_fatal_error(_("Unable to delete '%s'"), buf);
}
/* create frmt file */
sprintf(buf, "%s/%s", GV_DIRECTORY, output);
fd = G_fopen_new(buf, GV_FRMT_ELEMENT);
if (fd == NULL)
G_fatal_error(_("Unable to create file '%s/%s'"), buf, GV_FRMT_ELEMENT);
if (!use_ogr) {
char *table_name, *schema_name;
get_table_name(options.layer->answer, &table_name, &schema_name);
fprintf(fd, "format: postgis\n");
fprintf(fd, "conninfo: %s\n", dsn);
if (schema_name)
fprintf(fd, "schema: %s\n", schema_name);
fprintf(fd, "table: %s\n", table_name);
G_free(table_name);
G_free(schema_name);
}
else {
fprintf(fd, "format: ogr\n");
fprintf(fd, "dsn: %s\n", dsn);
fprintf(fd, "layer: %s\n", options.layer->answer);
}
fclose(fd);
if (!flags.topo->answer) {
Vect_set_open_level(1);
if (Vect_open_old(&Map, output, G_mapset()) < 0)
G_fatal_error(_("Unable to open vector map <%s>"), output);
Vect_build(&Map);
Vect_close(&Map);
}
G_done_msg(_("Link to vector map <%s> created."), output);
exit(EXIT_SUCCESS);
}
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