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qgsgrassprovider.cpp
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qgsgrassprovider.cpp
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/***************************************************************************
qgsgrassprovider.cpp - Data provider for GRASS format
-------------------
begin : March, 2004
copyright : (C) 2004 by Gary E.Sherman, Radim Blazek
email : sherman@mrcc.com, blazek@itc.it
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsgrassprovider.h"
#include "qgsgrass.h"
#include "qgsapplication.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsfield.h"
#include "qgslogger.h"
#include <cfloat>
#include <QByteArray>
#include <QDir>
#include <QMessageBox>
#include <QTextCodec>
//#include <QtGui/qwindowdefs.h>
//#include <QtGui/qmacincludes_mac.h>
//#include <ApplicationServices/ApplicationServices.h>
#ifdef _MSC_VER
// enable grass prototypes
#define __STDC__ 1
#endif
extern "C"
{
#include <grass/gprojects.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/Vect.h>
}
#ifdef _MSC_VER
#undef __STDC__
#endif
std::vector<GLAYER> QgsGrassProvider::mLayers;
std::vector<GMAP> QgsGrassProvider::mMaps;
static QString GRASS_KEY = "grass"; // XXX verify this
static QString GRASS_DESCRIPTION = "Grass provider"; // XXX verify this
QgsGrassProvider::QgsGrassProvider( QString uri )
: QgsVectorDataProvider( uri )
{
QgsDebugMsg( QString( "QgsGrassProvider URI: %1" ).arg( uri ) );
QgsGrass::init();
QTime time;
time.start();
mValid = false;
// Parse URI
QDir dir( uri ); // it is not a directory in fact
QString myURI = dir.path(); // no dupl '/'
mLayer = dir.dirName();
myURI = myURI.left( dir.path().lastIndexOf( '/' ) );
dir = QDir( myURI );
mMapName = dir.dirName();
dir.cdUp();
mMapset = dir.dirName();
dir.cdUp();
mLocation = dir.dirName();
dir.cdUp();
mGisdbase = dir.path();
QgsDebugMsg( QString( "gisdbase: %1" ).arg( mGisdbase ) );
QgsDebugMsg( QString( "location: %1" ).arg( mLocation ) );
QgsDebugMsg( QString( "mapset: %1" ).arg( mMapset ) );
QgsDebugMsg( QString( "mapName: %1" ).arg( mMapName ) );
QgsDebugMsg( QString( "layer: %1" ).arg( mLayer ) );
/* Parse Layer, supported layers <field>_point, <field>_line, <field>_area
* Layer is opened even if it is empty (has no features)
*/
mLayerField = -1;
if ( mLayer.compare( "boundary" ) == 0 ) // currently not used
{
mLayerType = BOUNDARY;
mGrassType = GV_BOUNDARY;
}
else if ( mLayer.compare( "centroid" ) == 0 ) // currently not used
{
mLayerType = CENTROID;
mGrassType = GV_CENTROID;
}
else
{
mLayerField = grassLayer( mLayer );
if ( mLayerField == -1 )
{
QgsDebugMsg( QString( "Invalid layer name, no underscore found: %1" ).arg( mLayer ) );
return;
}
mGrassType = grassLayerType( mLayer );
if ( mGrassType == GV_POINT )
{
mLayerType = POINT;
}
else if ( mGrassType == GV_LINES )
{
mLayerType = LINE;
}
else if ( mGrassType == GV_AREA )
{
mLayerType = POLYGON;
}
else
{
QgsDebugMsg( QString( "Invalid layer name, wrong type: %1" ).arg( mLayer ) );
return;
}
}
QgsDebugMsg( QString( "mLayerField: %1" ).arg( mLayerField ) );
QgsDebugMsg( QString( "mLayerType: %1" ).arg( mLayerType ) );
if ( mLayerType == BOUNDARY || mLayerType == CENTROID )
{
QgsDebugMsg( "Layer type not supported." );
return;
}
// Set QGIS type
switch ( mLayerType )
{
case POINT:
case CENTROID:
mQgisType = QGis::WKBPoint;
break;
case LINE:
case BOUNDARY:
mQgisType = QGis::WKBLineString;
break;
case POLYGON:
mQgisType = QGis::WKBPolygon;
break;
}
mLayerId = openLayer( mGisdbase, mLocation, mMapset, mMapName, mLayerField );
if ( mLayerId < 0 )
{
QgsDebugMsg( QString( "Cannot open GRASS layer:%1" ).arg( myURI ) );
return;
}
QgsDebugMsg( QString( "mLayerId: %1" ).arg( mLayerId ) );
mMap = layerMap( mLayerId );
// Getting the total number of features in the layer
mNumberFeatures = 0;
mCidxFieldIndex = -1;
if ( mLayerField >= 0 )
{
mCidxFieldIndex = Vect_cidx_get_field_index( mMap, mLayerField );
if ( mCidxFieldIndex >= 0 )
{
mNumberFeatures = Vect_cidx_get_type_count( mMap, mLayerField, mGrassType );
mCidxFieldNumCats = Vect_cidx_get_num_cats_by_index( mMap, mCidxFieldIndex );
}
}
else
{
// TODO nofield layers
mNumberFeatures = 0;
mCidxFieldNumCats = 0;
}
mNextCidx = 0;
QgsDebugMsg( QString( "mNumberFeatures = %1 mCidxFieldIndex = %2 mCidxFieldNumCats = %3" ).arg( mNumberFeatures ).arg( mCidxFieldIndex ).arg( mCidxFieldNumCats ) );
// Create selection array
mSelectionSize = allocateSelection( mMap, &mSelection );
resetSelection( 1 ); // TODO ? - where what reset
mMapVersion = mMaps[mLayers[mLayerId].mapId].version;
// Init structures
mPoints = Vect_new_line_struct();
mCats = Vect_new_cats_struct();
mList = Vect_new_list();
mValid = true;
QgsDebugMsg( QString( "New GRASS layer opened, time (ms): %1" ).arg( time.elapsed() ) );
}
void QgsGrassProvider::update( void )
{
QgsDebugMsg( "entered." );
mValid = false;
if ( ! mMaps[mLayers[mLayerId].mapId].valid ) return;
// Getting the total number of features in the layer
// It may happen that the field disappeares from the map (deleted features, new map without that field)
mNumberFeatures = 0;
mCidxFieldIndex = -1;
if ( mLayerField >= 0 )
{
mCidxFieldIndex = Vect_cidx_get_field_index( mMap, mLayerField );
if ( mCidxFieldIndex >= 0 )
{
mNumberFeatures = Vect_cidx_get_type_count( mMap, mLayerField, mGrassType );
mCidxFieldNumCats = Vect_cidx_get_num_cats_by_index( mMap, mCidxFieldIndex );
}
}
else
{
// TODO nofield layers
mNumberFeatures = 0;
mCidxFieldNumCats = 0;
}
mNextCidx = 0;
QgsDebugMsg( QString( "mNumberFeatures = %1 mCidxFieldIndex = %2 mCidxFieldNumCats = %3" ).arg( mNumberFeatures ).arg( mCidxFieldIndex ).arg( mCidxFieldNumCats ) );
// Create selection array
if ( mSelection ) free( mSelection );
mSelectionSize = allocateSelection( mMap, &mSelection );
resetSelection( 1 );
mMapVersion = mMaps[mLayers[mLayerId].mapId].version;
mValid = true;
}
int QgsGrassProvider::allocateSelection( struct Map_info *map, char **selection )
{
int size;
QgsDebugMsg( "entered." );
int nlines = Vect_get_num_lines( map );
int nareas = Vect_get_num_areas( map );
if ( nlines > nareas )
{
size = nlines + 1;
}
else
{
size = nareas + 1;
}
QgsDebugMsg( QString( "nlines = %1 nareas = %2 size = %3" ).arg( nlines ).arg( nareas ).arg( size ) );
*selection = ( char * ) malloc( size );
return size;
}
QgsGrassProvider::~QgsGrassProvider()
{
QgsDebugMsg( "entered." );
closeLayer( mLayerId );
}
QString QgsGrassProvider::storageType() const
{
return "GRASS (Geographic Resources Analysis and Support System) file";
}
bool QgsGrassProvider::nextFeature( QgsFeature& feature )
{
int cat, type, id;
unsigned char *wkb;
int wkbsize;
QgsDebugMsgLevel( "entered.", 3 );
if ( isEdited() || isFrozen() || !mValid )
return false;
if ( mCidxFieldIndex < 0 ) return false; // No features, no features in this layer
// Get next line/area id
int found = 0;
while ( mNextCidx < mCidxFieldNumCats )
{
Vect_cidx_get_cat_by_index( mMap, mCidxFieldIndex, mNextCidx++, &cat, &type, &id );
// Warning: selection array is only of type line/area of current layer -> check type first
if ( !( type & mGrassType ) ) continue;
if ( !mSelection[id] ) continue;
found = 1;
break;
}
if ( !found ) return false; // No more features
#if QGISDEBUG > 3
QgsDebugMsg( QString( "cat = %1 type = %2 id = %3" ).arg( cat ).arg( type ).arg( id ) );
#endif
feature = QgsFeature( id );
// TODO int may be 64 bits (memcpy)
if ( type & ( GV_POINTS | GV_LINES ) ) /* points or lines */
{
Vect_read_line( mMap, mPoints, mCats, id );
int npoints = mPoints->n_points;
if ( type & GV_POINTS )
{
wkbsize = 1 + 4 + 2 * 8;
}
else // GV_LINES
{
wkbsize = 1 + 4 + 4 + npoints * 2 * 8;
}
wkb = new unsigned char[wkbsize];
unsigned char *wkbp = wkb;
wkbp[0] = ( unsigned char ) QgsApplication::endian();
wkbp += 1;
/* WKB type */
memcpy( wkbp, &mQgisType, 4 );
wkbp += 4;
/* number of points */
if ( type & GV_LINES )
{
memcpy( wkbp, &npoints, 4 );
wkbp += 4;
}
for ( int i = 0; i < npoints; i++ )
{
memcpy( wkbp, &( mPoints->x[i] ), 8 );
memcpy( wkbp + 8, &( mPoints->y[i] ), 8 );
wkbp += 16;
}
}
else // GV_AREA
{
Vect_get_area_points( mMap, id, mPoints );
int npoints = mPoints->n_points;
wkbsize = 1 + 4 + 4 + 4 + npoints * 2 * 8; // size without islands
wkb = new unsigned char[wkbsize];
wkb[0] = ( unsigned char ) QgsApplication::endian();
int offset = 1;
/* WKB type */
memcpy( wkb + offset, &mQgisType, 4 );
offset += 4;
/* Number of rings */
int nisles = Vect_get_area_num_isles( mMap, id );
int nrings = 1 + nisles;
memcpy( wkb + offset, &nrings, 4 );
offset += 4;
/* Outer ring */
memcpy( wkb + offset, &npoints, 4 );
offset += 4;
for ( int i = 0; i < npoints; i++ )
{
memcpy( wkb + offset, &( mPoints->x[i] ), 8 );
memcpy( wkb + offset + 8, &( mPoints->y[i] ), 8 );
offset += 16;
}
/* Isles */
for ( int i = 0; i < nisles; i++ )
{
Vect_get_isle_points( mMap, Vect_get_area_isle( mMap, id, i ), mPoints );
npoints = mPoints->n_points;
// add space
wkbsize += 4 + npoints * 2 * 8;
wkb = ( unsigned char * ) realloc( wkb, wkbsize );
memcpy( wkb + offset, &npoints, 4 );
offset += 4;
for ( int i = 0; i < npoints; i++ )
{
memcpy( wkb + offset, &( mPoints->x[i] ), 8 );
memcpy( wkb + offset + 8, &( mPoints->y[i] ), 8 );
offset += 16;
}
}
}
feature.setGeometryAndOwnership( wkb, wkbsize );
setFeatureAttributes( mLayerId, cat, &feature, mAttributesToFetch );
return true;
}
void QgsGrassProvider::resetSelection( bool sel )
{
QgsDebugMsg( "entered." );
if ( !mValid ) return;
memset( mSelection, ( int ) sel, mSelectionSize );
mNextCidx = 0;
}
void QgsGrassProvider::select( QgsAttributeList fetchAttributes,
QgsRect rect,
bool fetchGeometry,
bool useIntersect )
{
mAttributesToFetch = fetchAttributes;
mFetchGeom = fetchGeometry;
if ( isEdited() || isFrozen() || !mValid )
return;
// check if outdated and update if necessary
int mapId = mLayers[mLayerId].mapId;
if ( mapOutdated( mapId ) )
{
updateMap( mapId );
}
if ( mMapVersion < mMaps[mapId].version )
{
update();
}
if ( attributesOutdated( mapId ) )
{
loadAttributes( mLayers[mLayerId] );
}
//no selection rectangle - use all features
if ( rect.isEmpty() )
{
resetSelection( 1 );
return;
}
//apply selection rectangle
resetSelection( 0 );
if ( !useIntersect )
{ // select by bounding boxes only
BOUND_BOX box;
box.N = rect.yMax(); box.S = rect.yMin();
box.E = rect.xMax(); box.W = rect.xMin();
box.T = PORT_DOUBLE_MAX; box.B = -PORT_DOUBLE_MAX;
if ( mLayerType == POINT || mLayerType == CENTROID || mLayerType == LINE || mLayerType == BOUNDARY )
{
Vect_select_lines_by_box( mMap, &box, mGrassType, mList );
}
else if ( mLayerType == POLYGON )
{
Vect_select_areas_by_box( mMap, &box, mList );
}
}
else
{ // check intersection
struct line_pnts *Polygon;
Polygon = Vect_new_line_struct();
Vect_append_point( Polygon, rect.xMin(), rect.yMin(), 0 );
Vect_append_point( Polygon, rect.xMax(), rect.yMin(), 0 );
Vect_append_point( Polygon, rect.xMax(), rect.yMax(), 0 );
Vect_append_point( Polygon, rect.xMin(), rect.yMax(), 0 );
Vect_append_point( Polygon, rect.xMin(), rect.yMin(), 0 );
if ( mLayerType == POINT || mLayerType == CENTROID || mLayerType == LINE || mLayerType == BOUNDARY )
{
Vect_select_lines_by_polygon( mMap, Polygon, 0, NULL, mGrassType, mList );
}
else if ( mLayerType == POLYGON )
{
Vect_select_areas_by_polygon( mMap, Polygon, 0, NULL, mList );
}
Vect_destroy_line_struct( Polygon );
}
for ( int i = 0; i < mList->n_values; i++ )
{
if ( mList->value[i] <= mSelectionSize )
{
mSelection[mList->value[i]] = 1;
}
else
{
QgsDebugMsg( "Selected element out of range" );
}
}
}
QgsRect QgsGrassProvider::extent()
{
BOUND_BOX box;
Vect_get_map_box( mMap, &box );
return QgsRect( box.W, box.S, box.E, box.N );
}
/**
* Return the feature type
*/
QGis::WkbType QgsGrassProvider::geometryType() const
{
return mQgisType;
}
/**
* Return the feature type
*/
long QgsGrassProvider::featureCount() const
{
return mNumberFeatures;
}
/**
* Return the number of fields
*/
uint QgsGrassProvider::fieldCount() const
{
QgsDebugMsg( QString( "return: %1" ).arg( mLayers[mLayerId].fields.size() ) );
return mLayers[mLayerId].fields.size();
}
/**
* Return fields
*/
const QgsFieldMap & QgsGrassProvider::fields() const
{
return mLayers[mLayerId].fields;
}
int QgsGrassProvider::keyField()
{
return mLayers[mLayerId].keyColumn;
}
void QgsGrassProvider::begin()
{
if ( isEdited() || isFrozen() || !mValid )
return;
int mapId = mLayers[mLayerId].mapId;
if ( mapOutdated( mapId ) )
{
updateMap( mapId );
}
if ( mMapVersion < mMaps[mapId].version )
{
update();
}
if ( attributesOutdated( mapId ) )
{
loadAttributes( mLayers[mLayerId] );
}
mNextCidx = 0;
}
QVariant QgsGrassProvider::minimumValue( int index )
{
if ( !fields().contains( index ) )
{
QgsDebugMsg( "Warning: access requested to invalid field index: " + QString::number( index ) );
return QVariant();
}
return QVariant( mLayers[mLayerId].minmax[index][0] );
}
QVariant QgsGrassProvider::maxValue( int index )
{
if ( !fields().contains( index ) )
{
QgsDebugMsg( "Warning: access requested to invalid field index: " + QString::number( index ) );
return QVariant();
}
return QVariant( mLayers[mLayerId].minmax[index][1] );
}
bool QgsGrassProvider::isValid()
{
QgsDebugMsg( QString( "returned: %1" ).arg( mValid ? "true" : "false" ) );
return mValid;
}
// ------------------------------------------------------------------------------------------------------
// Compare categories in GATT
static int cmpAtt( const void *a, const void *b )
{
GATT *p1 = ( GATT * ) a;
GATT *p2 = ( GATT * ) b;
return ( p1->cat - p2->cat );
}
/* returns layerId or -1 on error */
int QgsGrassProvider::openLayer( QString gisdbase, QString location, QString mapset, QString mapName, int field )
{
QgsDebugMsg( QString( "gisdbase: %1" ).arg( gisdbase ) );
QgsDebugMsg( QString( "location: %1" ).arg( location ) );
QgsDebugMsg( QString( "mapset: %1" ).arg( mapset ) );
QgsDebugMsg( QString( "mapName: %1" ).arg( mapName ) );
QgsDebugMsg( QString( "field: %1" ).arg( field ) );
// Check if this layer is already opened
for ( unsigned int i = 0; i < mLayers.size(); i++ )
{
if ( !( mLayers[i].valid ) ) continue;
GMAP *mp = &( mMaps[mLayers[i].mapId] );
if ( mp->gisdbase == gisdbase && mp->location == location &&
mp->mapset == mapset && mp->mapName == mapName && mLayers[i].field == field )
{
// the layer already exists, return layer id
QgsDebugMsg( QString( "The layer is already opened with ID = %1" ).arg( i ) );
mLayers[i].nUsers++;
return i;
}
}
// Create a new layer
GLAYER layer;
layer.valid = false;
layer.field = field;
layer.nUsers = 1;
// Open map
layer.mapId = openMap( gisdbase, location, mapset, mapName );
if ( layer.mapId < 0 )
{
QgsDebugMsg( "Cannot open vector map" );
return -1;
}
QgsDebugMsg( QString( "layer.mapId = %1" ).arg( layer.mapId ) );
layer.map = mMaps[layer.mapId].map;
layer.attributes = 0; // because loadLayerSourcesFromMap will release old
loadLayerSourcesFromMap( layer );
layer.valid = true;
// Add new layer to layers
mLayers.push_back( layer );
QgsDebugMsg( QString( "New layer successfully opened%1" ).arg( layer.nAttributes ) );
return mLayers.size() - 1;
}
void QgsGrassProvider::loadLayerSourcesFromMap( GLAYER &layer )
{
QgsDebugMsg( "entered." );
// Reset and free
layer.fields.clear();
if ( layer.attributes )
{
for ( int i = 0; i < layer.nAttributes; i ++ )
{
for ( int j = 0; j < layer.nColumns; j ++ )
{
if ( layer.attributes[i].values[j] )
free( layer.attributes[i].values[j] );
}
free( layer.attributes[i].values );
}
free( layer.attributes );
}
loadAttributes( layer );
}
void QgsGrassProvider::loadAttributes( GLAYER &layer )
{
QgsDebugMsg( "entered." );
// TODO: free old attributes
if ( !layer.map ) return;
// Get field info
layer.fieldInfo = Vect_get_field( layer.map, layer.field ); // should work also with field = 0
// Read attributes
layer.nColumns = 0;
layer.nAttributes = 0;
layer.attributes = 0;
layer.fields.clear();
layer.keyColumn = -1;
if ( layer.fieldInfo == NULL )
{
QgsDebugMsg( "No field info -> no attribute table" );
}
else
{
QgsDebugMsg( "Field info found -> open database" );
dbDriver *databaseDriver = db_start_driver_open_database( layer.fieldInfo->driver,
layer.fieldInfo->database );
if ( databaseDriver == NULL )
{
QgsDebugMsg( QString( "Cannot open database %1 by driver %2" ).arg( layer.fieldInfo->database ).arg( layer.fieldInfo->driver ) );
}
else
{
QgsDebugMsg( "Database opened -> open select cursor" );
dbString dbstr;
db_init_string( &dbstr );
db_set_string( &dbstr, ( char * )"select * from " );
db_append_string( &dbstr, layer.fieldInfo->table );
QgsDebugMsg( QString( "SQL: %1" ).arg( db_get_string( &dbstr ) ) );
dbCursor databaseCursor;
if ( db_open_select_cursor( databaseDriver, &dbstr, &databaseCursor, DB_SCROLL ) != DB_OK )
{
layer.nColumns = 0;
db_close_database_shutdown_driver( databaseDriver );
QMessageBox::warning( 0, "Warning", "Cannot select attributes from table '" +
QString( layer.fieldInfo->table ) + "'" );
}
else
{
int nRecords = db_get_num_rows( &databaseCursor );
QgsDebugMsg( QString( "Number of records: %1" ).arg( nRecords ) );
dbTable *databaseTable = db_get_cursor_table( &databaseCursor );
layer.nColumns = db_get_table_number_of_columns( databaseTable );
layer.minmax = new double[layer.nColumns][2];
// Read columns' description
for ( int i = 0; i < layer.nColumns; i++ )
{
layer.minmax[i][0] = DBL_MAX;
layer.minmax[i][1] = -DBL_MAX;
dbColumn *column = db_get_table_column( databaseTable, i );
int ctype = db_sqltype_to_Ctype( db_get_column_sqltype( column ) );
QVariant::Type qtype = QVariant::String; //default to string
QgsDebugMsg( QString( "column = %1 ctype = %2" ).arg( db_get_column_name( column ) ).arg( ctype ) );
QString ctypeStr;
switch ( ctype )
{
case DB_C_TYPE_INT:
ctypeStr = "integer";
qtype = QVariant::Int;
break;
case DB_C_TYPE_DOUBLE:
ctypeStr = "double";
qtype = QVariant::Double;
break;
case DB_C_TYPE_STRING:
ctypeStr = "string";
qtype = QVariant::String;
break;
case DB_C_TYPE_DATETIME:
ctypeStr = "datetime";
qtype = QVariant::String;
break;
}
layer.fields[i] = QgsField( db_get_column_name( column ), qtype, ctypeStr,
db_get_column_length( column ), db_get_column_precision( column ) );
if ( G_strcasecmp( db_get_column_name( column ), layer.fieldInfo->key ) == 0 )
{
layer.keyColumn = i;
}
}
if ( layer.keyColumn < 0 )
{
layer.fields.clear();
layer.nColumns = 0;
QMessageBox::warning( 0, "Warning", "Key column '" + QString( layer.fieldInfo->key ) +
"' not found in the table '" + QString( layer.fieldInfo->table ) + "'" );
}
else
{
// Read attributes to the memory
layer.attributes = ( GATT * ) malloc( nRecords * sizeof( GATT ) );
while ( 1 )
{
int more;
if ( db_fetch( &databaseCursor, DB_NEXT, &more ) != DB_OK )
{
QgsDebugMsg( "Cannot fetch DB record" );
break;
}
if ( !more ) break; // no more records
// Check cat value
dbColumn *column = db_get_table_column( databaseTable, layer.keyColumn );
dbValue *value = db_get_column_value( column );
if ( db_test_value_isnull( value ) ) continue;
layer.attributes[layer.nAttributes].cat = db_get_value_int( value );
if ( layer.attributes[layer.nAttributes].cat < 0 ) continue;
layer.attributes[layer.nAttributes].values = ( char ** ) malloc( layer.nColumns * sizeof( char* ) );
for ( int i = 0; i < layer.nColumns; i++ )
{
column = db_get_table_column( databaseTable, i );
int sqltype = db_get_column_sqltype( column );
int ctype = db_sqltype_to_Ctype( sqltype );
value = db_get_column_value( column );
db_convert_value_to_string( value, sqltype, &dbstr );
#if QGISDEBUG > 3
QgsDebugMsg( QString( "column: %1" ).arg( db_get_column_name( column ) ) );
QgsDebugMsg( QString( "value: %1" ).arg( db_get_string( &dbstr ) ) );
#endif
layer.attributes[layer.nAttributes].values[i] = strdup( db_get_string( &dbstr ) );
if ( !db_test_value_isnull( value ) )
{
double dbl;
if ( ctype == DB_C_TYPE_INT )
{
dbl = db_get_value_int( value );
}
else if ( ctype == DB_C_TYPE_DOUBLE )
{
dbl = db_get_value_double( value );
}
else
{
dbl = 0;
}
if ( dbl < layer.minmax[i][0] )
{
layer.minmax[i][0] = dbl;
}
if ( dbl > layer.minmax[i][1] )
{
layer.minmax[i][1] = dbl;
}
}
}
layer.nAttributes++;
}
// Sort attributes by category
qsort( layer.attributes, layer.nAttributes, sizeof( GATT ), cmpAtt );
}
db_close_cursor( &databaseCursor );
db_close_database_shutdown_driver( databaseDriver );
db_free_string( &dbstr );
QgsDebugMsg( QString( "fields.size = %1" ).arg( layer.fields.size() ) );
QgsDebugMsg( QString( "number of attributes = %1" ).arg( layer.nAttributes ) );
}
}
}
// Add cat if no attribute fields exist (otherwise qgis crashes)
if ( layer.nColumns == 0 )
{
layer.keyColumn = 0;
layer.fields[0] = ( QgsField( "cat", QVariant::Int, "integer" ) );
layer.minmax = new double[1][2];
layer.minmax[0][0] = 0;
layer.minmax[0][1] = 0;
int cidx = Vect_cidx_get_field_index( layer.map, layer.field );
if ( cidx >= 0 )
{
int ncats, cat, type, id;
ncats = Vect_cidx_get_num_cats_by_index( layer.map, cidx );
if ( ncats > 0 )
{
Vect_cidx_get_cat_by_index( layer.map, cidx, 0, &cat, &type, &id );
layer.minmax[0][0] = cat;
Vect_cidx_get_cat_by_index( layer.map, cidx, ncats - 1, &cat, &type, &id );
layer.minmax[0][1] = cat;
}
}
}
GMAP *map = &( mMaps[layer.mapId] );
QFileInfo di( map->gisdbase + "/" + map->location + "/" + map->mapset + "/vector/" + map->mapName + "/dbln" );
map->lastAttributesModified = di.lastModified();
}
void QgsGrassProvider::closeLayer( int layerId )
{
QgsDebugMsg( QString( "Close layer %1 nUsers = %2" ).arg( layerId ).arg( mLayers[layerId].nUsers ) );
// TODO: not tested because delete is never used for providers
mLayers[layerId].nUsers--;
if ( mLayers[layerId].nUsers == 0 ) // No more users, free sources
{
QgsDebugMsg( "No more users -> delete layer" );
mLayers[layerId].valid = false;
// Column names/types
mLayers[layerId].fields.clear();
// Attributes
QgsDebugMsg( "Delete attribute values" );
for ( int i = 0; i < mLayers[layerId].nAttributes; i++ )
{
free( mLayers[layerId].attributes[i].values );
}
free( mLayers[layerId].attributes );
delete[] mLayers[layerId].minmax;
// Field info
free( mLayers[layerId].fieldInfo );
closeMap( mLayers[layerId].mapId );
}
}
/* returns mapId or -1 on error */
int QgsGrassProvider::openMap( QString gisdbase, QString location, QString mapset, QString mapName )
{
QgsDebugMsg( "entered." );
QString tmpPath = gisdbase + "/" + location + "/" + mapset + "/" + mapName;
// Check if this map is already opened
for ( unsigned int i = 0; i < mMaps.size(); i++ )
{
if ( mMaps[i].valid && mMaps[i].path == tmpPath )
{
// the map is already opened, return map id
QgsDebugMsg( QString( "The map is already opened with ID = %1" ).arg( i ) );
mMaps[i].nUsers++;
return i;
}
}
GMAP map;
map.valid = false;
map.frozen = false;
map.gisdbase = gisdbase;
map.location = location;
map.mapset = mapset;
map.mapName = mapName;
map.path = tmpPath;
map.nUsers = 1;
map.version = 1;
map.update = 0;
map.map = ( struct Map_info * ) malloc( sizeof( struct Map_info ) );
// Set GRASS location
QgsGrass::setLocation( gisdbase, location );
QgsDebugMsg( QString( "Setting gisdbase, location: %1, %2" ).arg( gisdbase ).arg( location ) );
// Find the vector
char *ms = G_find_vector2( mapName.toAscii().data(), mapset.toAscii().data() ) ;
if ( ms == NULL )
{
QgsDebugMsg( "Cannot find GRASS vector" );
return -1;
}
// Read the time of vector dir before Vect_open_old, because it may take long time (when the vector
// could be owerwritten)
QFileInfo di( gisdbase + "/" + location + "/" + mapset + "/vector/" + mapName );
map.lastModified = di.lastModified();