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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. *
* *
***************************************************************************/
#include <cstring>
#include <vector>
#include <cfloat>
#include <QString>
#include <QDateTime>
#include "qgis.h"
#include "qgsdataprovider.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgslinestringv2.h"
#include "qgspointv2.h"
#include "qgspolygonv2.h"
#include "qgsrectangle.h"
#include "qgsvectorlayer.h"
#include "qgsvectorlayereditbuffer.h"
#include "qgsgrass.h"
#include "qgsgrassprovider.h"
#include "qgsgrassfeatureiterator.h"
#include "qgsgrassvector.h"
#include "qgsapplication.h"
#include "qgscoordinatereferencesystem.h"
#include "qgslogger.h"
#include <QByteArray>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QMessageBox>
#include <QTextCodec>
#ifdef _MSC_VER
// enable grass prototypes
#define __STDC__ 1
#endif
extern "C"
{
#include <grass/version.h>
#include <grass/gprojects.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#if GRASS_VERSION_MAJOR < 7
#include <grass/Vect.h>
#else
#include <grass/vector.h>
#define BOUND_BOX bound_box
#endif
}
#ifdef _MSC_VER
#undef __STDC__
#endif
static QString GRASS_KEY = "grass";
QgsGrassProvider::QgsGrassProvider( QString uri )
: QgsVectorDataProvider( uri )
, mLayerField( -1 )
, mLayerType( POINT )
, mGrassType( 0 )
, mQgisType( QGis::WKBUnknown )
, mLayer( 0 )
, mMapVersion( 0 )
, mCidxFieldIndex( -1 )
, mCidxFieldNumCats( 0 )
, mNumberFeatures( 0 )
, mEditBuffer( 0 )
, mEditLayer( 0 )
, mNewFeatureType( 0 )
{
QgsDebugMsg( "uri = " + uri );
mValid = false;
if ( !QgsGrass::init() )
{
appendError( QgsGrass::errorMessage() );
return;
}
QTime time;
time.start();
// Parse URI
QDir dir( uri ); // it is not a directory in fact
QString myURI = dir.path(); // no dupl '/'
mLayerName = dir.dirName();
myURI = myURI.left( dir.path().lastIndexOf( '/' ) );
dir = QDir( myURI );
QString mapName = dir.dirName();
dir.cdUp();
QString mapset = dir.dirName();
dir.cdUp();
QString location = dir.dirName();
dir.cdUp();
QString gisdbase = dir.path();
mGrassObject = QgsGrassObject( gisdbase, location, mapset, mapName );
QgsDebugMsg( "mGrassObject = " + mGrassObject.toString() + " mLayerName = " + mLayerName );
/* Parse Layer, supported layers <field>_point, <field>_line, <field>_area
* Layer is opened even if it is empty (has no features)
*/
if ( mLayerName.compare( "boundary" ) == 0 ) // currently not used
{
mLayerType = BOUNDARY;
mGrassType = GV_BOUNDARY;
}
else if ( mLayerName.compare( "centroid" ) == 0 ) // currently not used
{
mLayerType = CENTROID;
mGrassType = GV_CENTROID;
}
else if ( mLayerName == "topo_point" )
{
mLayerType = TOPO_POINT;
mGrassType = GV_POINTS;
}
else if ( mLayerName == "topo_line" )
{
mLayerType = TOPO_LINE;
mGrassType = GV_LINES;
}
else if ( mLayerName == "topo_node" )
{
mLayerType = TOPO_NODE;
mGrassType = 0;
}
else
{
mLayerField = grassLayer( mLayerName );
if ( mLayerField == -1 )
{
QgsDebugMsg( QString( "Invalid layer name, no underscore found: %1" ).arg( mLayerName ) );
return;
}
mGrassType = grassLayerType( mLayerName );
if ( mGrassType == GV_POINT )
{
mLayerType = POINT;
}
else if ( mGrassType == GV_LINES )
{
mLayerType = LINE;
}
else if ( mGrassType == GV_FACE )
{
mLayerType = FACE;
}
else if ( mGrassType == GV_AREA )
{
mLayerType = POLYGON;
}
else
{
QgsDebugMsg( QString( "Invalid layer name, wrong type: %1" ).arg( mLayerName ) );
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:
case TOPO_POINT:
case TOPO_NODE:
mQgisType = QGis::WKBPoint;
break;
case LINE:
case BOUNDARY:
case TOPO_LINE:
mQgisType = QGis::WKBLineString;
break;
case POLYGON:
case FACE:
mQgisType = QGis::WKBPolygon;
break;
}
// the map may be invalid (e.g. wrong uri or open failed)
QgsGrassVectorMap *vectorMap = QgsGrassVectorMapStore::instance()->openMap( mGrassObject );
if ( !vectorMap ) // should not happen
{
QgsDebugMsg( "Cannot open map" );
return;
}
if ( !vectorMap->isValid() ) // may happen
{
QgsDebugMsg( "vectorMap is not valid" );
return;
}
mLayer = vectorMap->openLayer( mLayerField );
if ( !mLayer ) // should not happen
{
QgsDebugMsg( "Cannot open layer" );
return;
}
if ( !mLayer->map() || !mLayer->map()->map() ) // should not happen
{
QgsDebugMsg( "map is null" );
return;
}
loadMapInfo();
setTopoFields();
mLayer->map()->version();
connect( mLayer->map(), SIGNAL( dataChanged() ), SLOT( onDataChanged() ) );
// TODO: types according to database
mNativeTypes
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), "integer", QVariant::Int, 1, 10 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (real)" ), "double precision", QVariant::Double, 1, 20, 0, 15 )
<< QgsVectorDataProvider::NativeType( tr( "Text, limited variable length (varchar)" ), "varchar", QVariant::String, 1, 255, -1, -1 );
// TODO:
// << QgsVectorDataProvider::NativeType( tr( "Date" ), "date", QVariant::Date, 8, 8 );
mValid = true;
QgsDebugMsg( QString( "New GRASS layer opened, time (ms): %1" ).arg( time.elapsed() ) );
}
int QgsGrassProvider::capabilities() const
{
// for now, only one map may be edited at time
if ( mEditBuffer || ( mLayer && mLayer->map() && !mLayer->map()->isEdited() ) )
{
return AddFeatures | DeleteFeatures | ChangeGeometries | AddAttributes | DeleteAttributes | ChangeAttributeValues;
}
return 0;
}
void QgsGrassProvider::loadMapInfo()
{
// Getting the total number of features in the layer
mNumberFeatures = 0;
mCidxFieldIndex = -1;
if ( mLayerType == TOPO_POINT )
{
mNumberFeatures = Vect_get_num_primitives( map(), GV_POINTS );
}
else if ( mLayerType == TOPO_LINE )
{
mNumberFeatures = Vect_get_num_primitives( map(), GV_LINES );
}
else if ( mLayerType == TOPO_NODE )
{
mNumberFeatures = Vect_get_num_nodes( map() );
}
else
{
if ( mLayerField >= 0 )
{
mCidxFieldIndex = Vect_cidx_get_field_index( map(), mLayerField );
if ( mCidxFieldIndex >= 0 )
{
mNumberFeatures = Vect_cidx_get_type_count( map(), mLayerField, mGrassType );
mCidxFieldNumCats = Vect_cidx_get_num_cats_by_index( map(), mCidxFieldIndex );
}
}
else
{
// TODO nofield layers
mNumberFeatures = 0;
mCidxFieldNumCats = 0;
}
}
QgsDebugMsg( QString( "mNumberFeatures = %1 mCidxFieldIndex = %2 mCidxFieldNumCats = %3" ).arg( mNumberFeatures ).arg( mCidxFieldIndex ).arg( mCidxFieldNumCats ) );
}
void QgsGrassProvider::update( void )
{
QgsDebugMsg( "entered" );
// TODO
#if 0
mValid = false;
if ( !map()s[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)
loadMapInfo();
map()Version = map()s[mLayers[mLayerId].mapId].version;
mValid = true;
#endif
}
QgsGrassProvider::~QgsGrassProvider()
{
QgsDebugMsg( "entered" );
mLayer->close();
}
QgsAbstractFeatureSource* QgsGrassProvider::featureSource() const
{
const_cast<QgsGrassProvider*>( this )->ensureUpdated();
return new QgsGrassFeatureSource( this );
}
QString QgsGrassProvider::storageType() const
{
return "GRASS (Geographic Resources Analysis and Support System) file";
}
QgsFeatureIterator QgsGrassProvider::getFeatures( const QgsFeatureRequest& request )
{
//if ( isEdited() || isFrozen() || !mValid )
if ( isFrozen() || !mValid )
{
return QgsFeatureIterator();
}
// check if outdated and update if necessary
ensureUpdated();
QgsGrassFeatureSource * source = new QgsGrassFeatureSource( this );
QgsGrassFeatureIterator * iterator = new QgsGrassFeatureIterator( source, true, request );
return QgsFeatureIterator( iterator );
}
QgsRectangle QgsGrassProvider::extent()
{
if ( isValid() )
{
BOUND_BOX box;
Vect_get_map_box( map(), &box );
return QgsRectangle( box.W, box.S, box.E, box.N );
}
return QgsRectangle();
}
/**
* Return the feature type
*/
QGis::WkbType QgsGrassProvider::geometryType() const
{
return mQgisType;
}
long QgsGrassProvider::featureCount() const
{
return mNumberFeatures;
}
const QgsFields & QgsGrassProvider::fields() const
{
if ( isTopoType() )
{
return mTopoFields;
}
else
{
// Original fields must be returned during editing because edit buffer updates fields by indices
return mLayer->fields();
}
}
int QgsGrassProvider::keyField()
{
return mLayer->keyColumn();
}
QVariant QgsGrassProvider::minimumValue( int index )
{
if ( isValid() )
{
return mLayer->minMax().value( index ).first;
}
return QVariant();
}
QVariant QgsGrassProvider::maxValue( int index )
{
if ( isValid() )
{
return mLayer->minMax().value( index ).second;
}
return QVariant();
}
bool QgsGrassProvider::isValid()
{
QgsDebugMsg( QString( "returned: %1" ).arg( mValid ) );
return mValid && mLayer && mLayer->map() && mLayer->map()->map();
}
QgsCoordinateReferenceSystem QgsGrassProvider::crs()
{
return QgsGrass::crs( mGrassObject.gisdbase(), mGrassObject.location() );
}
int QgsGrassProvider::grassLayer()
{
return mLayerField;
}
int QgsGrassProvider::grassLayer( QString name )
{
// Get field number
int pos = name.indexOf( '_' );
if ( pos == -1 )
{
return -1;
}
return name.left( pos ).toInt();
}
int QgsGrassProvider::grassLayerType( QString name )
{
int pos = name.indexOf( '_' );
if ( pos == -1 )
{
return -1;
}
QString ts = name.right( name.length() - pos - 1 );
if ( ts.compare( "point" ) == 0 )
{
return GV_POINT; // ?! centroids may be points
}
else if ( ts.compare( "line" ) == 0 )
{
return GV_LINES;
}
else if ( ts.compare( "face" ) == 0 )
{
return GV_FACE;
}
else if ( ts.compare( "polygon" ) == 0 )
{
return GV_AREA;
}
return -1;
}
void QgsGrassProvider::onDataChanged()
{
QgsDebugMsg( "entered" );
emit dataChanged();
}
//----------------------------------------- Edit -------------------------------------------------------
bool QgsGrassProvider::isGrassEditable( void )
{
QgsDebugMsg( "entered" );
if ( !isValid() )
return false;
/* Check if current user is owner of mapset */
if ( G__mapset_permissions2( mGrassObject.gisdbase().toUtf8().data(), mGrassObject.location().toUtf8().data(), mGrassObject.mapset().toUtf8().data() ) != 1 )
return false;
// TODO: check format? (cannot edit OGR layers)
return true;
}
bool QgsGrassProvider::isEdited( void )
{
QgsDebugMsgLevel( "entered", 3 );
return ( mEditBuffer );
}
bool QgsGrassProvider::isFrozen( void )
{
QgsDebugMsgLevel( "entered", 3 );
// TODO ?
//return ( map()->mFrozen );
return false;
}
void QgsGrassProvider::freeze()
{
QgsDebugMsg( "entered" );
// TODO ?
#if 0
if ( !isValid() )
return;
QgsGrassVectorMap *map = &( map()s[mLayers[mLayerId].mapId] );
if ( map->mFrozen )
return;
map->mFrozen = true;
Vect_close( map->map() );
#endif
}
void QgsGrassProvider::thaw()
{
QgsDebugMsg( "entered" );
// TODO ?
#if 0
if ( !isValid() )
return;
QgsGrassVectorMap *map = &( map()s[mLayers[mLayerId].mapId] );
if ( !map->mFrozen )
return;
if ( reopenMap() )
{
map->mFrozen = false;
}
#endif
}
bool QgsGrassProvider::closeEdit( bool newMap, QgsVectorLayer *vectorLayer )
{
QgsDebugMsg( "entered" );
if ( !isValid() )
{
QgsDebugMsg( "not valid" );
return false;
}
mEditBuffer = 0;
mEditLayer = 0;
if ( mLayer->map()->closeEdit( newMap ) )
{
loadMapInfo();
if ( vectorLayer )
{
vectorLayer->updateFields();
}
return true;
}
return false;
}
void QgsGrassProvider::ensureUpdated()
{
// TODO
#if 0
int mapId = mLayers[mLayerId].mapId;
if ( mapOutdated( mapId ) )
{
updateMap( mapId );
}
if ( map()Version < map()s[mapId].version )
{
update();
}
if ( attributesOutdated( mapId ) )
{
loadAttributes( mLayers[mLayerId] );
}
#endif
}
int QgsGrassProvider::numLines( void )
{
QgsDebugMsg( "entered" );
//return ( Vect_get_num_lines( map() ) );
return mLayer->map()->numLines();
}
int QgsGrassProvider::numNodes( void )
{
QgsDebugMsg( "entered" );
return ( Vect_get_num_nodes( map() ) );
}
int QgsGrassProvider::readLine( struct line_pnts *Points, struct line_cats *Cats, int line )
{
QgsDebugMsgLevel( "entered", 3 );
if ( Points )
Vect_reset_line( Points );
if ( Cats )
Vect_reset_cats( Cats );
if ( !Vect_line_alive( map(), line ) )
return -1;
return ( Vect_read_line( map(), Points, Cats, line ) );
}
bool QgsGrassProvider::nodeCoor( int node, double *x, double *y )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_node_alive( map(), node ) )
{
*x = 0.0;
*y = 0.0;
return false;
}
Vect_get_node_coor( map(), node, x, y, NULL );
return true;
}
bool QgsGrassProvider::lineNodes( int line, int *node1, int *node2 )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_line_alive( map(), line ) )
{
*node1 = 0;
*node2 = 0;
return false;
}
#if GRASS_VERSION_MAJOR < 7
Vect_get_line_nodes( map(), line, node1, node2 );
#else
/* points don't have topology in GRASS >= 7 */
*node1 = 0;
*node2 = 0;
#endif
return true;
}
int QgsGrassProvider::writeLine( int type, struct line_pnts *Points, struct line_cats *Cats )
{
QgsDebugMsg( QString( "n_points = %1 n_cats = %2" ).arg( Points->n_points ).arg( Cats->n_cats ) );
if ( !isEdited() )
return -1;
return (( int ) Vect_write_line( map(), type, Points, Cats ) );
}
int QgsGrassProvider::rewriteLine( int line, int type, struct line_pnts *Points, struct line_cats *Cats )
{
QgsDebugMsg( QString( "n_points = %1 n_cats = %2" ).arg( Points->n_points ).arg( Cats->n_cats ) );
if ( !isEdited() )
return -1;
return ( Vect_rewrite_line( map(), line, type, Points, Cats ) );
}
int QgsGrassProvider::deleteLine( int line )
{
QgsDebugMsg( "entered" );
if ( !isEdited() )
return -1;
return ( Vect_delete_line( map(), line ) );
}
int QgsGrassProvider::findLine( double x, double y, int type, double threshold )
{
QgsDebugMsgLevel( "entered", 3 );
return ( Vect_find_line( map(), x, y, 0, type, threshold, 0, 0 ) );
}
int QgsGrassProvider::findNode( double x, double y, double threshold )
{
return ( Vect_find_node( map(), x, y, 0, threshold, 0 ) );
}
bool QgsGrassProvider::lineAreas( int line, int *left, int *right )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_line_alive( map(), line ) )
{
*left = 0;
*right = 0;
return false;
}
Vect_get_line_areas( map(), line, left, right );
return true;
}
int QgsGrassProvider::isleArea( int isle )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_isle_alive( map(), isle ) )
{
return 0;
}
return ( Vect_get_isle_area( map(), isle ) );
}
int QgsGrassProvider::centroidArea( int centroid )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_line_alive( map(), centroid ) )
{
return 0;
}
return ( Vect_get_centroid_area( map(), centroid ) );
}
int QgsGrassProvider::nodeNLines( int node )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_node_alive( map(), node ) )
{
return 0;
}
return ( Vect_get_node_n_lines( map(), node ) );
}
int QgsGrassProvider::nodeLine( int node, int idx )
{
QgsDebugMsgLevel( "entered", 3 );
if ( !Vect_node_alive( map(), node ) )
{
return 0;
}
return ( Vect_get_node_line( map(), node, idx ) );
}
int QgsGrassProvider::lineAlive( int line )
{
QgsDebugMsgLevel( "entered", 3 );
return ( Vect_line_alive( map(), line ) );
}
int QgsGrassProvider::nodeAlive( int node )
{
QgsDebugMsgLevel( "QgsGrassProvider::nodeAlive", 3 );
return ( Vect_node_alive( map(), node ) );
}
int QgsGrassProvider::numUpdatedLines( void )
{
QgsDebugMsg( QString( "numUpdatedLines = %1" ).arg( Vect_get_num_updated_lines( map() ) ) );
return ( Vect_get_num_updated_lines( map() ) );
}
int QgsGrassProvider::numUpdatedNodes( void )
{
QgsDebugMsg( QString( "numUpdatedNodes = %1" ).arg( Vect_get_num_updated_nodes( map() ) ) );
return ( Vect_get_num_updated_nodes( map() ) );
}
int QgsGrassProvider::updatedLine( int idx )
{
QgsDebugMsg( QString( "idx = %1" ).arg( idx ) );
QgsDebugMsg( QString( " updatedLine = %1" ).arg( Vect_get_updated_line( map(), idx ) ) );
return ( Vect_get_updated_line( map(), idx ) );
}
int QgsGrassProvider::updatedNode( int idx )
{
QgsDebugMsg( QString( "idx = %1" ).arg( idx ) );
QgsDebugMsg( QString( " updatedNode = %1" ).arg( Vect_get_updated_node( map(), idx ) ) );
return ( Vect_get_updated_node( map(), idx ) );
}
// ------------------ Attributes -------------------------------------------------
QString QgsGrassProvider::key( int field )
{
QgsDebugMsg( QString( "field = %1" ).arg( field ) );
struct field_info *fi = Vect_get_field( map(), field ); // should work also with field = 0
if ( !fi )
{
QgsDebugMsg( "No field info -> no attributes" );
return QString();
}
return QString::fromUtf8( fi->key );
}
QgsAttributeMap *QgsGrassProvider::attributes( int field, int cat )
{
QgsDebugMsg( QString( "field = %1 cat = %2" ).arg( field ).arg( cat ) );
QgsAttributeMap *att = new QgsAttributeMap;
struct field_info *fi = Vect_get_field( map(), field ); // should work also with field = 0
// Read attributes
if ( !fi )
{
QgsDebugMsg( "No field info -> no attributes" );
return att;
}
QgsDebugMsg( "Field info found -> open database" );
setMapset();
dbDriver *driver = db_start_driver_open_database( fi->driver, fi->database );
if ( !driver )
{
QgsDebugMsg( QString( "Cannot open database %1 by driver %2" ).arg( fi->database ).arg( fi->driver ) );
return att;
}
QgsDebugMsg( "Database opened -> read attributes" );
dbString dbstr;
db_init_string( &dbstr );
QString query;
query.sprintf( "select * from %s where %s = %d", fi->table, fi->key, cat );
db_set_string( &dbstr, query.toUtf8().data() );
QgsDebugMsg( QString( "SQL: %1" ).arg( db_get_string( &dbstr ) ) );
dbCursor databaseCursor;
if ( db_open_select_cursor( driver, &dbstr, &databaseCursor, DB_SCROLL ) != DB_OK )
{
db_close_database_shutdown_driver( driver );
QgsDebugMsg( "Cannot select attributes from table" );
return att;
}
int nRecords = db_get_num_rows( &databaseCursor );
QgsDebugMsg( QString( "Number of records: %1" ).arg( nRecords ) );
if ( nRecords < 1 )
{
db_close_database_shutdown_driver( driver );
QgsDebugMsg( "No DB record" );
return att;
}
dbTable *databaseTable = db_get_cursor_table( &databaseCursor );
int nColumns = db_get_table_number_of_columns( databaseTable );
int more;
if ( db_fetch( &databaseCursor, DB_NEXT, &more ) != DB_OK )
{
db_close_database_shutdown_driver( driver );
QgsDebugMsg( "Cannot fetch DB record" );
return att;
}
// Read columns' description
for ( int i = 0; i < nColumns; i++ )
{
dbColumn *column = db_get_table_column( databaseTable, i );
db_convert_column_value_to_string( column, &dbstr );
QString v = mEncoding->toUnicode( db_get_string( &dbstr ) );
QgsDebugMsg( QString( "Value: %1" ).arg( v ) );
att->insert( i, QVariant( v ) );
}
db_close_cursor( &databaseCursor );
db_close_database_shutdown_driver( driver );
db_free_string( &dbstr );
return att;
}
int QgsGrassProvider::numDbLinks( void )
{
QgsDebugMsg( "entered" );
return ( Vect_get_num_dblinks( map() ) );
}
int QgsGrassProvider::dbLinkField( int link )
{
QgsDebugMsg( "entered" );
struct field_info *fi = Vect_get_dblink( map(), link );
if ( !fi )
return 0;
return ( fi->number );
}
bool QgsGrassProvider::isTopoType() const
{
return isTopoType( mLayerType );
}
bool QgsGrassProvider::isTopoType( int layerType )
{
return layerType == TOPO_POINT || layerType == TOPO_LINE || layerType == TOPO_NODE;
}
void QgsGrassProvider::setTopoFields()
{
mTopoFields.append( QgsField( "id", QVariant::Int ) );
if ( mLayerType == TOPO_POINT )
{
mTopoFields.append( QgsField( "type", QVariant::String ) );
mTopoFields.append( QgsField( "node", QVariant::Int ) );
}
else if ( mLayerType == TOPO_LINE )
{
mTopoFields.append( QgsField( "type", QVariant::String ) );
mTopoFields.append( QgsField( "node1", QVariant::Int ) );
mTopoFields.append( QgsField( "node2", QVariant::Int ) );
mTopoFields.append( QgsField( "left", QVariant::Int ) );
mTopoFields.append( QgsField( "right", QVariant::Int ) );
}
else if ( mLayerType == TOPO_NODE )
{
mTopoFields.append( QgsField( "lines", QVariant::String ) );
}
}
void QgsGrassProvider::startEditing( QgsVectorLayer *vectorLayer )
{
QgsDebugMsg( "uri = " + dataSourceUri() );
if ( !vectorLayer || !vectorLayer->editBuffer() )
{
QgsDebugMsg( "vector or buffer is null" );
return;
}
mEditLayer = vectorLayer;
if ( !isValid() || !isGrassEditable() )
{
QgsDebugMsg( "not valid or not editable" );
return;
}
if ( mEditBuffer )
{
QgsDebugMsg( "already edited" );
return;
}
mLayer->map()->startEdit();
mEditBuffer = vectorLayer->editBuffer();
connect( mEditBuffer, SIGNAL( featureAdded( QgsFeatureId ) ), SLOT( onFeatureAdded( QgsFeatureId ) ) );