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qgsdelimitedtextprovider.cpp
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qgsdelimitedtextprovider.cpp
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/***************************************************************************
qgsdelimitedtextprovider.cpp - Data provider for delimited text
-------------------
begin : 2004-02-27
copyright : (C) 2004 by Gary E.Sherman
email : sherman at mrcc.com
***************************************************************************/
/***************************************************************************
* *
* 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 "qgsdelimitedtextprovider.h"
#include <QtGlobal>
#include <QFile>
#include <QFileInfo>
#include <QDataStream>
#include <QTextStream>
#include <QStringList>
#include <QSettings>
#include <QRegularExpression>
#include <QUrl>
#include <QUrlQuery>
#include "qgsapplication.h"
#include "qgscoordinateutils.h"
#include "qgsdataprovider.h"
#include "qgsexpression.h"
#include "qgsfeature.h"
#include "qgsfields.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsmessageoutput.h"
#include "qgsrectangle.h"
#include "qgsspatialindex.h"
#include "qgis.h"
#include "qgsexpressioncontextutils.h"
#include "qgsproviderregistry.h"
#include "qgsdelimitedtextfeatureiterator.h"
#include "qgsdelimitedtextfile.h"
const QString QgsDelimitedTextProvider::TEXT_PROVIDER_KEY = QStringLiteral( "delimitedtext" );
const QString QgsDelimitedTextProvider::TEXT_PROVIDER_DESCRIPTION = QStringLiteral( "Delimited text data provider" );
// If more than this fraction of records are not in a subset then use an index to
// iterate over records rather than simple iterator and filter.
static const int SUBSET_ID_THRESHOLD_FACTOR = 10;
QRegularExpression QgsDelimitedTextProvider::sWktPrefixRegexp( QStringLiteral( "^\\s*(?:\\d+\\s+|SRID\\=\\d+\\;)" ), QRegularExpression::CaseInsensitiveOption );
QRegularExpression QgsDelimitedTextProvider::sCrdDmsRegexp( QStringLiteral( "^\\s*(?:([-+nsew])\\s*)?(\\d{1,3})(?:[^0-9.]+([0-5]?\\d))?[^0-9.]+([0-5]?\\d(?:\\.\\d+)?)[^0-9.]*([-+nsew])?\\s*$" ), QRegularExpression::CaseInsensitiveOption );
QgsDelimitedTextProvider::QgsDelimitedTextProvider( const QString &uri, const ProviderOptions &options, QgsDataProvider::ReadFlags flags )
: QgsVectorDataProvider( uri, options, flags )
{
// Add supported types to enable creating expression fields in field calculator
setNativeTypes( QList< NativeType >()
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), QStringLiteral( "integer" ), QVariant::Int, 0, 10 )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer - 64 bit)" ), QStringLiteral( "int8" ), QVariant::LongLong )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), QStringLiteral( "double precision" ), QVariant::Double, -1, -1, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Text, unlimited length (text)" ), QStringLiteral( "text" ), QVariant::String, -1, -1, -1, -1 )
// date type
<< QgsVectorDataProvider::NativeType( tr( "Date" ), QStringLiteral( "date" ), QVariant::Date, -1, -1, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Time" ), QStringLiteral( "time" ), QVariant::Time, -1, -1, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Date & Time" ), QStringLiteral( "datetime" ), QVariant::DateTime, -1, -1, -1, -1 )
);
QgsDebugMsgLevel( "Delimited text file uri is " + uri, 2 );
const QUrl url = QUrl::fromEncoded( uri.toLatin1() );
mFile = std::make_unique< QgsDelimitedTextFile >();
mFile->setFromUrl( url );
QString subset;
const QUrlQuery query( url );
if ( query.hasQueryItem( QStringLiteral( "geomType" ) ) )
{
const QString gtype = query.queryItemValue( QStringLiteral( "geomType" ) ).toLower();
if ( gtype == QLatin1String( "point" ) ) mGeometryType = QgsWkbTypes::PointGeometry;
else if ( gtype == QLatin1String( "line" ) ) mGeometryType = QgsWkbTypes::LineGeometry;
else if ( gtype == QLatin1String( "polygon" ) ) mGeometryType = QgsWkbTypes::PolygonGeometry;
else if ( gtype == QLatin1String( "none " ) ) mGeometryType = QgsWkbTypes::NullGeometry;
}
if ( mGeometryType != QgsWkbTypes::NullGeometry )
{
if ( query.hasQueryItem( QStringLiteral( "wktField" ) ) )
{
mWktFieldName = query.queryItemValue( QStringLiteral( "wktField" ) );
mGeomRep = GeomAsWkt;
QgsDebugMsgLevel( "wktField is: " + mWktFieldName, 2 );
}
else if ( query.hasQueryItem( QStringLiteral( "xField" ) ) && query.hasQueryItem( QStringLiteral( "yField" ) ) )
{
mGeomRep = GeomAsXy;
mGeometryType = QgsWkbTypes::PointGeometry;
mXFieldName = query.queryItemValue( QStringLiteral( "xField" ) );
mYFieldName = query.queryItemValue( QStringLiteral( "yField" ) );
if ( query.hasQueryItem( QStringLiteral( "zField" ) ) )
mZFieldName = query.queryItemValue( QStringLiteral( "zField" ) );
if ( query.hasQueryItem( QStringLiteral( "mField" ) ) )
mMFieldName = query.queryItemValue( QStringLiteral( "mField" ) );
QgsDebugMsgLevel( "xField is: " + mXFieldName, 2 );
QgsDebugMsgLevel( "yField is: " + mYFieldName, 2 );
QgsDebugMsgLevel( "zField is: " + mZFieldName, 2 );
QgsDebugMsgLevel( "mField is: " + mMFieldName, 2 );
if ( query.hasQueryItem( QStringLiteral( "xyDms" ) ) )
{
mXyDms = ! query.queryItemValue( QStringLiteral( "xyDms" ) ).toLower().startsWith( 'n' );
}
}
else
{
mGeometryType = QgsWkbTypes::NullGeometry;
}
}
mDetectTypes = true;
if ( query.hasQueryItem( QStringLiteral( "detectTypes" ) ) )
mDetectTypes = ! query.queryItemValue( QStringLiteral( "detectTypes" ) ).toLower().startsWith( 'n' );
if ( query.hasQueryItem( QStringLiteral( "decimalPoint" ) ) )
mDecimalPoint = query.queryItemValue( QStringLiteral( "decimalPoint" ) );
if ( query.hasQueryItem( QStringLiteral( "crs" ) ) )
mCrs.createFromString( query.queryItemValue( QStringLiteral( "crs" ) ) );
if ( query.hasQueryItem( QStringLiteral( "subsetIndex" ) ) )
{
mBuildSubsetIndex = ! query.queryItemValue( QStringLiteral( "subsetIndex" ) ).toLower().startsWith( 'n' );
}
if ( query.hasQueryItem( QStringLiteral( "spatialIndex" ) ) )
{
mBuildSpatialIndex = ! query.queryItemValue( QStringLiteral( "spatialIndex" ) ).toLower().startsWith( 'n' );
}
if ( query.hasQueryItem( QStringLiteral( "subset" ) ) )
{
// We need to specify FullyDecoded so that %25 is decoded as %
subset = query.queryItemValue( QStringLiteral( "subset" ), QUrl::FullyDecoded );
QgsDebugMsgLevel( "subset is: " + subset, 2 );
}
if ( query.hasQueryItem( QStringLiteral( "quiet" ) ) ) mShowInvalidLines = false;
// Do an initial scan of the file to determine field names, types,
// geometry type (for Wkt), extents, etc. Parameter value subset.isEmpty()
// avoid redundant building indexes if we will be building a subset string,
// in which case indexes will be rebuilt.
scanFile( subset.isEmpty() );
if ( ! subset.isEmpty() )
{
setSubsetString( subset );
}
}
QgsDelimitedTextProvider::~QgsDelimitedTextProvider() = default;
QgsAbstractFeatureSource *QgsDelimitedTextProvider::featureSource() const
{
// If the file has become invalid, rescan to check that it is still invalid.
//
if ( ( mLayerValid && ! mValid ) || mRescanRequired )
const_cast<QgsDelimitedTextProvider *>( this )->rescanFile();
return new QgsDelimitedTextFeatureSource( this );
}
QStringList QgsDelimitedTextProvider::readCsvtFieldTypes( const QString &filename, QString *message )
{
// Look for a file with the same name as the data file, but an extra 't' or 'T' at the end
QStringList types;
QFileInfo csvtInfo( filename + 't' );
if ( ! csvtInfo.exists() ) csvtInfo.setFile( filename + 'T' );
if ( ! csvtInfo.exists() ) return types;
QFile csvtFile( csvtInfo.filePath() );
if ( ! csvtFile.open( QIODevice::ReadOnly ) ) return types;
// If anything goes wrong here, just ignore it, as the file
// is not valid, so just ignore any exceptions.
// For it to be valid, there must be just one non blank line at the beginning of the
// file.
QString strTypeList;
try
{
QTextStream csvtStream( &csvtFile );
strTypeList = csvtStream.readLine();
if ( strTypeList.isEmpty() ) return types;
QString extra = csvtStream.readLine();
while ( ! extra.isNull() )
{
if ( ! extra.isEmpty() ) return types;
extra = csvtStream.readLine();
}
}
catch ( ... )
{
return types;
}
csvtFile.close();
// Is the type string valid?
// This is a slightly generous regular expression in that it allows spaces and unquoted field types
// not allowed in OGR CSVT files. Also doesn't care if int and string fields have
strTypeList = strTypeList.toLower();
const QRegularExpression reTypeList( QRegularExpression::anchoredPattern( QStringLiteral( "^(?:\\s*(\\\"?)(?:integer|real|double|long|longlong|int8|string|date|datetime|time)(?:\\(\\d+(?:\\.\\d+)?\\))?\\1\\s*(?:,|$))+" ) ) );
const QRegularExpressionMatch match = reTypeList.match( strTypeList );
if ( !match.hasMatch() )
{
// Looks like this was supposed to be a CSVT file, so report bad formatted string
if ( message ) { *message = tr( "File type string in %1 is not correctly formatted" ).arg( csvtInfo.fileName() ); }
return types;
}
// All good, so pull out the types from the string. Currently only returning integer, real, and string types
QgsDebugMsgLevel( QStringLiteral( "Reading field types from %1" ).arg( csvtInfo.fileName() ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Field type string: %1" ).arg( strTypeList ), 2 );
int pos = 0;
const QRegularExpression reType( QStringLiteral( "(integer|real|double|string|datetime|date|time)" ) );
QRegularExpressionMatch typeMatch = reType.match( strTypeList, pos );
while ( typeMatch.hasMatch() )
{
QgsDebugMsgLevel( QStringLiteral( "Found type: %1" ).arg( typeMatch.captured( 1 ) ), 2 );
types << typeMatch.captured( 1 );
pos = typeMatch.capturedEnd();
typeMatch = reType.match( strTypeList, pos );
}
if ( message )
{
// Would be a useful info message, but don't want dialog to pop up every time...
// *message=tr("Reading field types from %1").arg(csvtInfo.fileName());
}
return types;
}
void QgsDelimitedTextProvider::resetCachedSubset() const
{
mCachedSubsetString = QString();
mCachedUseSubsetIndex = false;
mCachedUseSpatialIndex = false;
}
void QgsDelimitedTextProvider::resetIndexes() const
{
resetCachedSubset();
mUseSubsetIndex = false;
mUseSpatialIndex = false;
mSubsetIndex.clear();
if ( mBuildSpatialIndex && mGeomRep != GeomNone )
mSpatialIndex = std::make_unique< QgsSpatialIndex >();
}
bool QgsDelimitedTextProvider::createSpatialIndex()
{
if ( mBuildSpatialIndex )
return true; // Already built
if ( mGeomRep == GeomNone )
return false; // Cannot build index - no geometries
// OK, set the spatial index option, set the Uri parameter so that the index is
// rebuilt when theproject is reloaded, and rescan the file to populate the index
mBuildSpatialIndex = true;
setUriParameter( QStringLiteral( "spatialIndex" ), QStringLiteral( "yes" ) );
rescanFile();
return true;
}
QgsFeatureSource::SpatialIndexPresence QgsDelimitedTextProvider::hasSpatialIndex() const
{
return mSpatialIndex ? QgsFeatureSource::SpatialIndexPresent : QgsFeatureSource::SpatialIndexNotPresent;
}
// Really want to merge scanFile and rescan into single code. Currently the reason
// this is not done is that scanFile is done initially to create field names and, rescan
// file includes building subset expression and assumes field names/types are already
// defined. Merging would not only make code a lot cleaner, but would also avoid
// double scan when loading a file with a subset expression.
// buildIndexes parameter of scanFile is set to false when we know we will be
// immediately rescanning (when the file is loaded and then the subset expression is
// set)
void QgsDelimitedTextProvider::scanFile( bool buildIndexes )
{
QStringList messages;
// assume the layer is invalid until proven otherwise
mLayerValid = false;
mValid = false;
mRescanRequired = false;
clearInvalidLines();
// Initiallize indexes
resetIndexes();
const bool buildSpatialIndex = buildIndexes && nullptr != mSpatialIndex;
// No point building a subset index if there is no geometry, as all
// records will be included.
const bool buildSubsetIndex = buildIndexes && mBuildSubsetIndex && mGeomRep != GeomNone;
if ( ! mFile->isValid() )
{
// uri is invalid so the layer must be too...
messages.append( tr( "File cannot be opened or delimiter parameters are not valid" ) );
reportErrors( messages );
QgsDebugMsgLevel( QStringLiteral( "Delimited text source invalid - filename or delimiter parameters" ), 2 );
return;
}
// Open the file and get number of rows, etc. We assume that the
// file has a header row and process accordingly. Caller should make
// sure that the delimited file is properly formed.
if ( mGeomRep == GeomAsWkt )
{
mWktFieldIndex = mFile->fieldIndex( mWktFieldName );
if ( mWktFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "Wkt" ), mWktFieldName ) );
}
}
else if ( mGeomRep == GeomAsXy )
{
mXFieldIndex = mFile->fieldIndex( mXFieldName );
mYFieldIndex = mFile->fieldIndex( mYFieldName );
if ( mXFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "X" ), mXFieldName ) );
}
if ( mYFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "Y" ), mYFieldName ) );
}
if ( !mZFieldName.isEmpty() )
{
mZFieldIndex = mFile->fieldIndex( mZFieldName );
if ( mZFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "Z" ), mZFieldName ) );
}
}
if ( !mMFieldName.isEmpty() )
{
mMFieldIndex = mFile->fieldIndex( mMFieldName );
if ( mMFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "M" ), mMFieldName ) );
}
}
}
if ( !messages.isEmpty() )
{
reportErrors( messages );
QgsDebugMsgLevel( QStringLiteral( "Delimited text source invalid - missing geometry fields" ), 2 );
return;
}
// Scan the entire file to determine
// 1) the number of fields (this is handled by QgsDelimitedTextFile mFile
// 2) the number of valid features. Note that the selection of valid features
// should match the code in QgsDelimitedTextFeatureIterator
// 3) the geometric extents of the layer
// 4) the type of each field
//
// Also build subset and spatial indexes.
QStringList parts;
long nEmptyRecords = 0;
long nBadFormatRecords = 0;
long nIncompatibleGeometry = 0;
long nInvalidGeometry = 0;
long nEmptyGeometry = 0;
mNumberFeatures = 0;
mExtent = QgsRectangle();
QList<bool> isEmpty;
QList<bool> couldBeInt;
QList<bool> couldBeLongLong;
QList<bool> couldBeDouble;
QList<bool> couldBeDateTime;
QList<bool> couldBeDate;
QList<bool> couldBeTime;
bool foundFirstGeometry = false;
while ( true )
{
const QgsDelimitedTextFile::Status status = mFile->nextRecord( parts );
if ( status == QgsDelimitedTextFile::RecordEOF )
break;
if ( status != QgsDelimitedTextFile::RecordOk )
{
nBadFormatRecords++;
recordInvalidLine( tr( "Invalid record format at line %1" ) );
continue;
}
// Skip over empty records
if ( recordIsEmpty( parts ) )
{
nEmptyRecords++;
continue;
}
// Check geometries are valid
bool geomValid = true;
if ( mGeomRep == GeomAsWkt )
{
if ( mWktFieldIndex >= parts.size() || parts[mWktFieldIndex].isEmpty() )
{
nEmptyGeometry++;
mNumberFeatures++;
}
else
{
// Get the wkt - confirm it is valid, get the type, and
// if compatible with the rest of file, add to the extents
QString sWkt = parts[mWktFieldIndex];
QgsGeometry geom;
if ( !mWktHasPrefix && sWkt.indexOf( sWktPrefixRegexp ) >= 0 )
mWktHasPrefix = true;
geom = geomFromWkt( sWkt, mWktHasPrefix );
if ( !geom.isNull() )
{
const QgsWkbTypes::Type type = geom.wkbType();
if ( type != QgsWkbTypes::NoGeometry )
{
if ( mGeometryType == QgsWkbTypes::UnknownGeometry || geom.type() == mGeometryType )
{
mGeometryType = geom.type();
if ( !foundFirstGeometry )
{
mNumberFeatures++;
mWkbType = type;
mExtent = geom.boundingBox();
foundFirstGeometry = true;
}
else
{
mNumberFeatures++;
if ( geom.isMultipart() )
mWkbType = type;
const QgsRectangle bbox( geom.boundingBox() );
mExtent.combineExtentWith( bbox );
}
if ( buildSpatialIndex )
{
QgsFeature f;
f.setId( mFile->recordId() );
f.setGeometry( geom );
mSpatialIndex->addFeature( f );
}
}
else
{
nIncompatibleGeometry++;
geomValid = false;
}
}
}
else
{
geomValid = false;
nInvalidGeometry++;
recordInvalidLine( tr( "Invalid WKT at line %1" ) );
}
}
}
else if ( mGeomRep == GeomAsXy )
{
// Get the x and y values, first checking to make sure they
// aren't null.
QString sX = mXFieldIndex < parts.size() ? parts[mXFieldIndex] : QString();
QString sY = mYFieldIndex < parts.size() ? parts[mYFieldIndex] : QString();
QString sZ, sM;
if ( mZFieldIndex > -1 )
sZ = mZFieldIndex < parts.size() ? parts[mZFieldIndex] : QString();
if ( mMFieldIndex > -1 )
sM = mMFieldIndex < parts.size() ? parts[mMFieldIndex] : QString();
if ( sX.isEmpty() && sY.isEmpty() )
{
nEmptyGeometry++;
mNumberFeatures++;
}
else
{
QgsPoint pt;
const bool ok = pointFromXY( sX, sY, pt, mDecimalPoint, mXyDms );
if ( ok )
{
if ( !sZ.isEmpty() || sM.isEmpty() )
appendZM( sZ, sM, pt, mDecimalPoint );
if ( foundFirstGeometry )
{
mExtent.combineExtentWith( pt.x(), pt.y() );
}
else
{
// Extent for the first point is just the first point
mExtent.set( pt.x(), pt.y(), pt.x(), pt.y() );
mWkbType = QgsWkbTypes::Point;
if ( mZFieldIndex > -1 )
mWkbType = QgsWkbTypes::addZ( mWkbType );
if ( mMFieldIndex > -1 )
mWkbType = QgsWkbTypes::addM( mWkbType );
mGeometryType = QgsWkbTypes::PointGeometry;
foundFirstGeometry = true;
}
mNumberFeatures++;
if ( buildSpatialIndex && std::isfinite( pt.x() ) && std::isfinite( pt.y() ) )
{
QgsFeature f;
f.setId( mFile->recordId() );
f.setGeometry( QgsGeometry::fromPointXY( pt ) );
mSpatialIndex->addFeature( f );
}
}
else
{
geomValid = false;
nInvalidGeometry++;
recordInvalidLine( tr( "Invalid X or Y fields at line %1" ) );
}
}
}
else
{
mWkbType = QgsWkbTypes::NoGeometry;
mNumberFeatures++;
}
if ( !geomValid )
continue;
if ( buildSubsetIndex )
mSubsetIndex.append( mFile->recordId() );
// If we are going to use this record, then assess the potential types of each column
for ( int i = 0; i < parts.size(); i++ )
{
QString &value = parts[i];
// Ignore empty fields - spreadsheet generated CSV files often
// have random empty fields at the end of a row
if ( value.isEmpty() )
continue;
// Expand the columns to include this non empty field if necessary
while ( couldBeInt.size() <= i )
{
isEmpty.append( true );
couldBeInt.append( false );
couldBeLongLong.append( false );
couldBeDouble.append( false );
couldBeDateTime.append( false );
couldBeDate.append( false );
couldBeTime.append( false );
}
// If this column has been empty so far then initiallize it
// for possible types
if ( isEmpty[i] )
{
isEmpty[i] = false;
couldBeInt[i] = true;
couldBeLongLong[i] = true;
couldBeDouble[i] = true;
couldBeDateTime[i] = true;
couldBeDate[i] = true;
couldBeTime[i] = true;
}
if ( ! mDetectTypes )
{
continue;
}
// Now test for still valid possible types for the field
// Types are possible until first record which cannot be parsed
if ( couldBeInt[i] )
{
( void )value.toInt( &couldBeInt[i] );
}
if ( couldBeLongLong[i] && !couldBeInt[i] )
{
( void )value.toLongLong( &couldBeLongLong[i] );
}
if ( couldBeDouble[i] && !couldBeLongLong[i] )
{
if ( ! mDecimalPoint.isEmpty() )
{
value.replace( mDecimalPoint, QLatin1String( "." ) );
}
( void )value.toDouble( &couldBeDouble[i] );
}
if ( couldBeDateTime[i] )
{
QDateTime dt;
if ( value.length() > 10 )
{
dt = QDateTime::fromString( value, Qt::ISODate );
}
couldBeDateTime[i] = ( dt.isValid() );
}
if ( couldBeDate[i] && !couldBeDateTime[i] )
{
const QDate d = QDate::fromString( value, Qt::ISODate );
couldBeDate[i] = d.isValid();
}
if ( couldBeTime[i] && !couldBeDateTime[i] )
{
#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
const QTime t = QTime::fromString( value );
couldBeTime[i] = t.isValid();
#else
// Accept 12:34, 12:34:56 or 12:34:56.789
// We do not use QTime::fromString() with Qt < 5.14 as it accepts
// strings like 01/03/2004 as valid times
couldBeTime[i] = value.length() >= 5 &&
value[0] >= '0' && value[0] <= '2' &&
value[1] >= '0' && value[1] <= '9' &&
value[2] == ':' &&
value[3] >= '0' && value[3] <= '5' &&
value[4] >= '0' && value[4] <= '9';
if ( couldBeTime[i] && value.length() == 5 )
{
// ok
}
else if ( couldBeTime[i] && value.length() >= 8 )
{
couldBeTime[i] = value[5] == ':' &&
value[6] >= '0' && value[6] <= '6' &&
value[7] >= '0' && value[7] <= '9';
if ( couldBeTime[i] && value.length() == 8 )
{
// ok
}
else if ( couldBeTime[i] && value.length() >= 9 )
{
couldBeTime[i] = value[8] == '.';
}
else
{
couldBeTime[i] = false;
}
}
else
{
couldBeTime[i] = false;
}
#endif
}
}
}
// Now create the attribute fields. Field types are determined by prioritizing
// integer, failing that double, datetime, date, time, and finally text.
QStringList fieldNames = mFile->fieldNames();
mFieldCount = fieldNames.size();
attributeColumns.clear();
attributeFields.clear();
QString csvtMessage;
QStringList csvtTypes = readCsvtFieldTypes( mFile->fileName(), &csvtMessage );
for ( int i = 0; i < fieldNames.size(); i++ )
{
// Skip over WKT field ... don't want to display in attribute table
if ( i == mWktFieldIndex )
continue;
// Add the field index lookup for the column
attributeColumns.append( i );
QVariant::Type fieldType = QVariant::String;
QString typeName = QStringLiteral( "text" );
if ( i < csvtTypes.size() )
{
typeName = csvtTypes[i];
}
else if ( mDetectTypes && i < couldBeInt.size() )
{
if ( couldBeInt[i] )
{
typeName = QStringLiteral( "integer" );
}
else if ( couldBeLongLong[i] )
{
typeName = QStringLiteral( "longlong" );
}
else if ( couldBeDouble[i] )
{
typeName = QStringLiteral( "double" );
}
else if ( couldBeDateTime[i] )
{
typeName = QStringLiteral( "datetime" );
}
else if ( couldBeDate[i] )
{
typeName = QStringLiteral( "date" );
}
else if ( couldBeTime[i] )
{
typeName = QStringLiteral( "time" );
}
}
if ( typeName == QLatin1String( "integer" ) )
{
fieldType = QVariant::Int;
}
else if ( typeName == QLatin1String( "longlong" ) )
{
fieldType = QVariant::LongLong;
}
else if ( typeName == QLatin1String( "real" ) || typeName == QLatin1String( "double" ) )
{
typeName = QStringLiteral( "double" );
fieldType = QVariant::Double;
}
else if ( typeName == QLatin1String( "datetime" ) )
{
fieldType = QVariant::DateTime;
}
else if ( typeName == QLatin1String( "date" ) )
{
fieldType = QVariant::Date;
}
else if ( typeName == QLatin1String( "time" ) )
{
fieldType = QVariant::Time;
}
else
{
typeName = QStringLiteral( "text" );
}
attributeFields.append( QgsField( fieldNames[i], fieldType, typeName ) );
}
QgsDebugMsgLevel( "Field count for the delimited text file is " + QString::number( attributeFields.size() ), 2 );
QgsDebugMsgLevel( "geometry type is: " + QString::number( mWkbType ), 2 );
QgsDebugMsgLevel( "feature count is: " + QString::number( mNumberFeatures ), 2 );
QStringList warnings;
if ( ! csvtMessage.isEmpty() )
warnings.append( csvtMessage );
if ( nBadFormatRecords > 0 )
warnings.append( tr( "%1 records discarded due to invalid format" ).arg( nBadFormatRecords ) );
if ( nEmptyGeometry > 0 )
warnings.append( tr( "%1 records have missing geometry definitions" ).arg( nEmptyGeometry ) );
if ( nInvalidGeometry > 0 )
warnings.append( tr( "%1 records discarded due to invalid geometry definitions" ).arg( nInvalidGeometry ) );
if ( nIncompatibleGeometry > 0 )
warnings.append( tr( "%1 records discarded due to incompatible geometry types" ).arg( nIncompatibleGeometry ) );
reportErrors( warnings );
// Decide whether to use subset ids to index records rather than simple iteration through all
// If more than 10% of records are being skipped, then use index. (Not based on any experimentation,
// could do with some analysis?)
if ( buildSubsetIndex )
{
long recordCount = mFile->recordCount();
recordCount -= recordCount / SUBSET_ID_THRESHOLD_FACTOR;
mUseSubsetIndex = mSubsetIndex.size() < recordCount;
if ( ! mUseSubsetIndex )
mSubsetIndex = QList<quintptr>();
}
mUseSpatialIndex = buildSpatialIndex;
mValid = mGeometryType != QgsWkbTypes::UnknownGeometry;
mLayerValid = mValid;
// If it is valid, then watch for changes to the file
connect( mFile.get(), &QgsDelimitedTextFile::fileUpdated, this, &QgsDelimitedTextProvider::onFileUpdated );
}
// rescanFile. Called if something has changed file definition, such as
// selecting a subset, the file has been changed by another program, etc
void QgsDelimitedTextProvider::rescanFile() const
{
mRescanRequired = false;
resetIndexes();
const bool buildSpatialIndex = nullptr != mSpatialIndex;
const bool buildSubsetIndex = mBuildSubsetIndex && ( mSubsetExpression || mGeomRep != GeomNone );
// In case file has been rewritten check that it is still valid
mValid = mLayerValid && mFile->isValid();
if ( ! mValid )
return;
// Open the file and get number of rows, etc. We assume that the
// file has a header row and process accordingly. Caller should make
// sure that the delimited file is properly formed.
QStringList messages;
if ( mGeomRep == GeomAsWkt )
{
mWktFieldIndex = mFile->fieldIndex( mWktFieldName );
if ( mWktFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "Wkt" ), mWktFieldName ) );
}
}
else if ( mGeomRep == GeomAsXy )
{
mXFieldIndex = mFile->fieldIndex( mXFieldName );
mYFieldIndex = mFile->fieldIndex( mYFieldName );
if ( mXFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "X" ), mWktFieldName ) );
}
if ( mYFieldIndex < 0 )
{
messages.append( tr( "%0 field %1 is not defined in delimited text file" ).arg( QStringLiteral( "Y" ), mWktFieldName ) );
}
}
if ( !messages.isEmpty() )
{
reportErrors( messages );
QgsDebugMsgLevel( QStringLiteral( "Delimited text source invalid on rescan - missing geometry fields" ), 2 );
mValid = false;
return;
}
// Reset the field columns
for ( int i = 0; i < attributeFields.size(); i++ )
{
attributeColumns[i] = mFile->fieldIndex( attributeFields.at( i ).name() );
}
// Scan through the features in the file
mSubsetIndex.clear();
mUseSubsetIndex = false;
QgsFeatureIterator fi = getFeatures( QgsFeatureRequest() );
mNumberFeatures = 0;
mExtent = QgsRectangle();
QgsFeature f;
bool foundFirstGeometry = false;
while ( fi.nextFeature( f ) )
{
if ( mGeometryType != QgsWkbTypes::NullGeometry && f.hasGeometry() )
{
if ( !foundFirstGeometry )
{
mExtent = f.geometry().boundingBox();
foundFirstGeometry = true;
}
else
{
const QgsRectangle bbox( f.geometry().boundingBox() );
mExtent.combineExtentWith( bbox );
}
if ( buildSpatialIndex )
mSpatialIndex->addFeature( f );
}
if ( buildSubsetIndex )
mSubsetIndex.append( ( quintptr ) f.id() );
mNumberFeatures++;
}
if ( buildSubsetIndex )
{
long recordCount = mFile->recordCount();
recordCount -= recordCount / SUBSET_ID_THRESHOLD_FACTOR;
mUseSubsetIndex = recordCount < mSubsetIndex.size();
if ( ! mUseSubsetIndex )
mSubsetIndex.clear();
}
mUseSpatialIndex = buildSpatialIndex;
}
QgsGeometry QgsDelimitedTextProvider::geomFromWkt( QString &sWkt, bool wktHasPrefixRegexp )
{
QgsGeometry geom;
try
{
if ( wktHasPrefixRegexp )
{
sWkt.remove( sWktPrefixRegexp );
}
geom = QgsGeometry::fromWkt( sWkt );
}
catch ( ... )
{
geom = QgsGeometry();
}
return geom;
}
void QgsDelimitedTextProvider::appendZM( QString &sZ, QString &sM, QgsPoint &point, const QString &decimalPoint )
{
if ( ! decimalPoint.isEmpty() )
{
sZ.replace( decimalPoint, QLatin1String( "." ) );
sM.replace( decimalPoint, QLatin1String( "." ) );
}
bool zOk, mOk;
double z, m;
if ( !sZ.isEmpty() )
{
z = sZ.toDouble( &zOk );
if ( zOk )
point.addZValue( z );
}
if ( !sM.isEmpty() )
{
m = sM.toDouble( &mOk );
if ( mOk )
point.addMValue( m );
}
}
bool QgsDelimitedTextProvider::pointFromXY( QString &sX, QString &sY, QgsPoint &pt, const QString &decimalPoint, bool xyDms )
{
if ( ! decimalPoint.isEmpty() )
{
sX.replace( decimalPoint, QLatin1String( "." ) );
sY.replace( decimalPoint, QLatin1String( "." ) );
}
bool xOk, yOk;
double x, y;
if ( xyDms )
{
x = QgsCoordinateUtils::dmsToDecimal( sX, &xOk );
y = QgsCoordinateUtils::dmsToDecimal( sY, &yOk );
}
else
{
x = sX.toDouble( &xOk );
y = sY.toDouble( &yOk );
}
if ( xOk && yOk )
{
pt.setX( x );
pt.setY( y );
return true;
}
return false;
}