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| 1 | +/*************************************************************************** |
| 2 | + qgsogrutils.cpp |
| 3 | + --------------- |
| 4 | + begin : February 2016 |
| 5 | + copyright : (C) 2016 Nyall Dawson |
| 6 | + email : nyall dot dawson at gmail dot com |
| 7 | + *************************************************************************** |
| 8 | + * * |
| 9 | + * This program is free software; you can redistribute it and/or modify * |
| 10 | + * it under the terms of the GNU General Public License as published by * |
| 11 | + * the Free Software Foundation; either version 2 of the License, or * |
| 12 | + * (at your option) any later version. * |
| 13 | + * * |
| 14 | + ***************************************************************************/ |
| 15 | + |
| 16 | +#include "qgsogrutils.h" |
| 17 | +#include "qgsapplication.h" |
| 18 | +#include "qgslogger.h" |
| 19 | +#include "qgsgeometry.h" |
| 20 | +#include <QTextCodec> |
| 21 | +#include <QUuid> |
| 22 | + |
| 23 | +#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800 |
| 24 | +#define TO8(x) (x).toUtf8().constData() |
| 25 | +#define TO8F(x) (x).toUtf8().constData() |
| 26 | +#define FROM8(x) QString::fromUtf8(x) |
| 27 | +#else |
| 28 | +#define TO8(x) (x).toLocal8Bit().constData() |
| 29 | +#define TO8F(x) QFile::encodeName( x ).constData() |
| 30 | +#define FROM8(x) QString::fromLocal8Bit(x) |
| 31 | +#endif |
| 32 | + |
| 33 | +QgsFeature QgsOgrUtils::readOgrFeature( OGRFeatureH ogrFet, const QgsFields& fields, QTextCodec* encoding ) |
| 34 | +{ |
| 35 | + QgsFeature feature; |
| 36 | + if ( !ogrFet ) |
| 37 | + { |
| 38 | + feature.setValid( false ); |
| 39 | + return feature; |
| 40 | + } |
| 41 | + |
| 42 | + feature.setFeatureId( OGR_F_GetFID( ogrFet ) ); |
| 43 | + feature.setValid( true ); |
| 44 | + |
| 45 | + if ( !readOgrFeatureGeometry( ogrFet, feature ) ) |
| 46 | + { |
| 47 | + feature.setValid( false ); |
| 48 | + } |
| 49 | + |
| 50 | + if ( !readOgrFeatureAttributes( ogrFet, fields, feature, encoding ) ) |
| 51 | + { |
| 52 | + feature.setValid( false ); |
| 53 | + } |
| 54 | + |
| 55 | + return feature; |
| 56 | +} |
| 57 | + |
| 58 | +QgsFields QgsOgrUtils::readOgrFields( OGRFeatureH ogrFet, QTextCodec* encoding ) |
| 59 | +{ |
| 60 | + QgsFields fields; |
| 61 | + |
| 62 | + if ( !ogrFet ) |
| 63 | + return fields; |
| 64 | + |
| 65 | + int fieldCount = OGR_F_GetFieldCount( ogrFet ); |
| 66 | + for ( int i = 0; i < fieldCount; ++i ) |
| 67 | + { |
| 68 | + OGRFieldDefnH fldDef = OGR_F_GetFieldDefnRef( ogrFet, i ); |
| 69 | + if ( !fldDef ) |
| 70 | + { |
| 71 | + fields.append( QgsField() ); |
| 72 | + continue; |
| 73 | + } |
| 74 | + |
| 75 | + QString name = encoding->toUnicode( OGR_Fld_GetNameRef( fldDef ) ); |
| 76 | + QVariant::Type varType; |
| 77 | + switch ( OGR_Fld_GetType( fldDef ) ) |
| 78 | + { |
| 79 | + case OFTInteger: |
| 80 | + varType = QVariant::Int; |
| 81 | + break; |
| 82 | +#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 2000000 |
| 83 | + case OFTInteger64: |
| 84 | + varType = QVariant::LongLong; |
| 85 | + break; |
| 86 | +#endif |
| 87 | + case OFTReal: |
| 88 | + varType = QVariant::Double; |
| 89 | + break; |
| 90 | +#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1400 |
| 91 | + case OFTDate: |
| 92 | + varType = QVariant::Date; |
| 93 | + break; |
| 94 | + case OFTTime: |
| 95 | + varType = QVariant::Time; |
| 96 | + break; |
| 97 | + case OFTDateTime: |
| 98 | + varType = QVariant::DateTime; |
| 99 | + break; |
| 100 | + case OFTString: |
| 101 | +#endif |
| 102 | + default: |
| 103 | + varType = QVariant::String; // other unsupported, leave it as a string |
| 104 | + } |
| 105 | + fields.append( QgsField( name, varType ) ); |
| 106 | + } |
| 107 | + return fields; |
| 108 | +} |
| 109 | + |
| 110 | +QVariant QgsOgrUtils::getOgrFeatureAttribute( OGRFeatureH ogrFet, const QgsFields& fields, int attIndex, QTextCodec* encoding , bool* ok ) |
| 111 | +{ |
| 112 | + if ( !ogrFet || attIndex < 0 || attIndex >= fields.count() ) |
| 113 | + { |
| 114 | + if ( ok ) |
| 115 | + *ok = false; |
| 116 | + return QVariant(); |
| 117 | + } |
| 118 | + |
| 119 | + OGRFieldDefnH fldDef = OGR_F_GetFieldDefnRef( ogrFet, attIndex ); |
| 120 | + |
| 121 | + if ( ! fldDef ) |
| 122 | + { |
| 123 | + if ( ok ) |
| 124 | + *ok = false; |
| 125 | + |
| 126 | + QgsDebugMsg( "ogrFet->GetFieldDefnRef(attindex) returns NULL" ); |
| 127 | + return QVariant(); |
| 128 | + } |
| 129 | + |
| 130 | + QVariant value; |
| 131 | + |
| 132 | + if ( ok ) |
| 133 | + *ok = true; |
| 134 | + |
| 135 | + if ( OGR_F_IsFieldSet( ogrFet, attIndex ) ) |
| 136 | + { |
| 137 | + switch ( fields.at( attIndex ).type() ) |
| 138 | + { |
| 139 | + case QVariant::String: |
| 140 | + value = QVariant( encoding->toUnicode( OGR_F_GetFieldAsString( ogrFet, attIndex ) ) ); |
| 141 | + break; |
| 142 | + case QVariant::Int: |
| 143 | + value = QVariant( OGR_F_GetFieldAsInteger( ogrFet, attIndex ) ); |
| 144 | + break; |
| 145 | +#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 2000000 |
| 146 | + case QVariant::LongLong: |
| 147 | + value = QVariant( OGR_F_GetFieldAsInteger64( ogrFet, attIndex ) ); |
| 148 | + break; |
| 149 | +#endif |
| 150 | + case QVariant::Double: |
| 151 | + value = QVariant( OGR_F_GetFieldAsDouble( ogrFet, attIndex ) ); |
| 152 | + break; |
| 153 | + case QVariant::Date: |
| 154 | + case QVariant::DateTime: |
| 155 | + case QVariant::Time: |
| 156 | + { |
| 157 | + int year, month, day, hour, minute, second, tzf; |
| 158 | + |
| 159 | + OGR_F_GetFieldAsDateTime( ogrFet, attIndex, &year, &month, &day, &hour, &minute, &second, &tzf ); |
| 160 | + if ( fields.at( attIndex ).type() == QVariant::Date ) |
| 161 | + value = QDate( year, month, day ); |
| 162 | + else if ( fields.at( attIndex ).type() == QVariant::Time ) |
| 163 | + value = QTime( hour, minute, second ); |
| 164 | + else |
| 165 | + value = QDateTime( QDate( year, month, day ), QTime( hour, minute, second ) ); |
| 166 | + } |
| 167 | + break; |
| 168 | + default: |
| 169 | + Q_ASSERT_X( false, "QgsOgrUtils::getOgrFeatureAttribute", "unsupported field type" ); |
| 170 | + if ( ok ) |
| 171 | + *ok = false; |
| 172 | + } |
| 173 | + } |
| 174 | + else |
| 175 | + { |
| 176 | + value = QVariant( QString::null ); |
| 177 | + } |
| 178 | + |
| 179 | + return value; |
| 180 | +} |
| 181 | + |
| 182 | +bool QgsOgrUtils::readOgrFeatureAttributes( OGRFeatureH ogrFet, const QgsFields& fields, QgsFeature& feature, QTextCodec* encoding ) |
| 183 | +{ |
| 184 | + // read all attributes |
| 185 | + feature.initAttributes( fields.count() ); |
| 186 | + feature.setFields( fields ); |
| 187 | + |
| 188 | + if ( !ogrFet ) |
| 189 | + return false; |
| 190 | + |
| 191 | + bool ok = false; |
| 192 | + for ( int idx = 0; idx < fields.count(); ++idx ) |
| 193 | + { |
| 194 | + QVariant value = getOgrFeatureAttribute( ogrFet, fields, idx, encoding, &ok ); |
| 195 | + if ( ok ) |
| 196 | + { |
| 197 | + feature.setAttribute( idx, value ); |
| 198 | + } |
| 199 | + } |
| 200 | + return true; |
| 201 | +} |
| 202 | + |
| 203 | +bool QgsOgrUtils::readOgrFeatureGeometry( OGRFeatureH ogrFet, QgsFeature& feature ) |
| 204 | +{ |
| 205 | + if ( !ogrFet ) |
| 206 | + return false; |
| 207 | + |
| 208 | + OGRGeometryH geom = OGR_F_GetGeometryRef( ogrFet ); |
| 209 | + if ( !geom ) |
| 210 | + feature.setGeometry( nullptr ); |
| 211 | + else |
| 212 | + feature.setGeometry( ogrGeometryToQgsGeometry( geom ) ); |
| 213 | + |
| 214 | + return true; |
| 215 | +} |
| 216 | + |
| 217 | +QgsGeometry* QgsOgrUtils::ogrGeometryToQgsGeometry( OGRGeometryH geom ) |
| 218 | +{ |
| 219 | + if ( !geom ) |
| 220 | + return nullptr; |
| 221 | + |
| 222 | + // get the wkb representation |
| 223 | + int memorySize = OGR_G_WkbSize( geom ); |
| 224 | + unsigned char *wkb = new unsigned char[memorySize]; |
| 225 | + OGR_G_ExportToWkb( geom, ( OGRwkbByteOrder ) QgsApplication::endian(), wkb ); |
| 226 | + |
| 227 | + QgsGeometry *g = new QgsGeometry(); |
| 228 | + g->fromWkb( wkb, memorySize ); |
| 229 | + return g; |
| 230 | +} |
| 231 | + |
| 232 | +QgsFeatureList QgsOgrUtils::stringToFeatureList( const QString& string, const QgsFields& fields, QTextCodec* encoding ) |
| 233 | +{ |
| 234 | + QgsFeatureList features; |
| 235 | + if ( string.isEmpty() ) |
| 236 | + return features; |
| 237 | + |
| 238 | + QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid() ); |
| 239 | + |
| 240 | + // create memory file system object from string buffer |
| 241 | + QByteArray ba = string.toUtf8(); |
| 242 | + VSIFCloseL( VSIFileFromMemBuffer( TO8( randomFileName ), reinterpret_cast< GByte* >( ba.data() ), |
| 243 | + static_cast< vsi_l_offset >( ba.size() ), FALSE ) ); |
| 244 | + |
| 245 | + OGRDataSourceH hDS = OGROpen( TO8( randomFileName ), false, nullptr ); |
| 246 | + if ( !hDS ) |
| 247 | + { |
| 248 | + VSIUnlink( TO8( randomFileName ) ); |
| 249 | + return features; |
| 250 | + } |
| 251 | + |
| 252 | + OGRLayerH ogrLayer = OGR_DS_GetLayer( hDS, 0 ); |
| 253 | + if ( !ogrLayer ) |
| 254 | + { |
| 255 | + OGR_DS_Destroy( hDS ); |
| 256 | + VSIUnlink( TO8( randomFileName ) ); |
| 257 | + return features; |
| 258 | + } |
| 259 | + |
| 260 | + OGRFeatureH oFeat; |
| 261 | + while (( oFeat = OGR_L_GetNextFeature( ogrLayer ) ) ) |
| 262 | + { |
| 263 | + QgsFeature feat = readOgrFeature( oFeat, fields, encoding ); |
| 264 | + if ( feat.isValid() ) |
| 265 | + features << feat; |
| 266 | + |
| 267 | + OGR_F_Destroy( oFeat ); |
| 268 | + } |
| 269 | + |
| 270 | + OGR_DS_Destroy( hDS ); |
| 271 | + VSIUnlink( "/vsimem/clipboard.dat" ); |
| 272 | + |
| 273 | + return features; |
| 274 | +} |
| 275 | + |
| 276 | +QgsFields QgsOgrUtils::stringToFields( const QString& string, QTextCodec* encoding ) |
| 277 | +{ |
| 278 | + QgsFields fields; |
| 279 | + if ( string.isEmpty() ) |
| 280 | + return fields; |
| 281 | + |
| 282 | + QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid() ); |
| 283 | + |
| 284 | + // create memory file system object from buffer |
| 285 | + QByteArray ba = string.toUtf8(); |
| 286 | + VSIFCloseL( VSIFileFromMemBuffer( TO8( randomFileName ), reinterpret_cast< GByte* >( ba.data() ), |
| 287 | + static_cast< vsi_l_offset >( ba.size() ), FALSE ) ); |
| 288 | + |
| 289 | + OGRDataSourceH hDS = OGROpen( TO8( randomFileName ), false, nullptr ); |
| 290 | + if ( !hDS ) |
| 291 | + { |
| 292 | + VSIUnlink( TO8( randomFileName ) ); |
| 293 | + return fields; |
| 294 | + } |
| 295 | + |
| 296 | + OGRLayerH ogrLayer = OGR_DS_GetLayer( hDS, 0 ); |
| 297 | + if ( !ogrLayer ) |
| 298 | + { |
| 299 | + OGR_DS_Destroy( hDS ); |
| 300 | + VSIUnlink( TO8( randomFileName ) ); |
| 301 | + return fields; |
| 302 | + } |
| 303 | + |
| 304 | + OGRFeatureH oFeat; |
| 305 | + //read in the first feature only |
| 306 | + if (( oFeat = OGR_L_GetNextFeature( ogrLayer ) ) ) |
| 307 | + { |
| 308 | + fields = readOgrFields( oFeat, encoding ); |
| 309 | + OGR_F_Destroy( oFeat ); |
| 310 | + } |
| 311 | + |
| 312 | + OGR_DS_Destroy( hDS ); |
| 313 | + VSIUnlink( TO8( randomFileName ) ); |
| 314 | + return fields; |
| 315 | +} |
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