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qgscoordinatereferencesystem.cpp
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qgscoordinatereferencesystem.cpp
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/***************************************************************************
qgscoordinatereferencesystem.cpp
-------------------
begin : 2007
copyright : (C) 2007 by Gary E. Sherman
email : sherman@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 "qgscoordinatereferencesystem.h"
#include "qgscoordinatereferencesystem_p.h"
#include <cmath>
#include <QDir>
#include <QTemporaryFile>
#include <QDomNode>
#include <QDomElement>
#include <QFileInfo>
#include <QRegExp>
#include <QTextStream>
#include <QFile>
#include <QRegularExpression>
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgis.h" //const vals declared here
#include "qgslocalec.h"
#include "qgssettings.h"
#include <sqlite3.h>
#include <proj_api.h>
//gdal and ogr includes (needed for == operator)
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
#include <cpl_csv.h>
//! The length of the string "+lat_1="
const int LAT_PREFIX_LEN = 7;
CUSTOM_CRS_VALIDATION QgsCoordinateReferenceSystem::mCustomSrsValidation = nullptr;
QReadWriteLock QgsCoordinateReferenceSystem::sSrIdCacheLock;
QHash< long, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sSrIdCache;
QReadWriteLock QgsCoordinateReferenceSystem::sOgcLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sOgcCache;
QReadWriteLock QgsCoordinateReferenceSystem::sProj4CacheLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sProj4Cache;
QReadWriteLock QgsCoordinateReferenceSystem::sCRSWktLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sWktCache;
QReadWriteLock QgsCoordinateReferenceSystem::sCRSSrsIdLock;
QHash< long, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sSrsIdCache;
QReadWriteLock QgsCoordinateReferenceSystem::sCrsStringLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sStringCache;
//--------------------------
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem()
{
d = new QgsCoordinateReferenceSystemPrivate();
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const QString &definition )
{
d = new QgsCoordinateReferenceSystemPrivate();
createFromString( definition );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const long id, CrsType type )
{
d = new QgsCoordinateReferenceSystemPrivate();
createFromId( id, type );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &srs ) //NOLINT
: d( srs.d )
{
}
QgsCoordinateReferenceSystem &QgsCoordinateReferenceSystem::operator=( const QgsCoordinateReferenceSystem &srs ) //NOLINT
{
d = srs.d;
return *this;
}
QList<long> QgsCoordinateReferenceSystem::validSrsIds()
{
QList<long> results;
// check both standard & user defined projection databases
QStringList dbs = QStringList() << QgsApplication::srsDatabaseFilePath() << QgsApplication::qgisUserDatabaseFilePath();
Q_FOREACH ( const QString &db, dbs )
{
QFileInfo myInfo( db );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + db + " does not exist!" );
continue;
}
sqlite3_database_unique_ptr database;
sqlite3_statement_unique_ptr statement;
//check the db is available
int result = openDatabase( db, database );
if ( result != SQLITE_OK )
{
QgsDebugMsg( "failed : " + db + " could not be opened!" );
continue;
}
QString sql = QStringLiteral( "select srs_id from tbl_srs" );
int rc;
statement = database.prepare( sql, rc );
while ( true )
{
// this one is an infinitive loop, intended to fetch any row
int ret = statement.step();
if ( ret == SQLITE_DONE )
{
// there are no more rows to fetch - we can stop looping
break;
}
if ( ret == SQLITE_ROW )
{
results.append( statement.columnAsInt64( 0 ) );
}
else
{
QgsMessageLog::logMessage( QObject::tr( "SQLite error: %2\nSQL: %1" ).arg( sql, sqlite3_errmsg( database.get() ) ), QObject::tr( "SpatiaLite" ) );
break;
}
}
}
std::sort( results.begin(), results.end() );
return results;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromOgcWmsCrs( const QString &ogcCrs )
{
QgsCoordinateReferenceSystem crs;
crs.createFromOgcWmsCrs( ogcCrs );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromEpsgId( long epsg )
{
return fromOgcWmsCrs( "EPSG:" + QString::number( epsg ) );
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromProj4( const QString &proj4 )
{
QgsCoordinateReferenceSystem crs;
crs.createFromProj4( proj4 );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromWkt( const QString &wkt )
{
QgsCoordinateReferenceSystem crs;
crs.createFromWkt( wkt );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromSrsId( long srsId )
{
QgsCoordinateReferenceSystem crs;
crs.createFromSrsId( srsId );
return crs;
}
QgsCoordinateReferenceSystem::~QgsCoordinateReferenceSystem() //NOLINT
{
}
bool QgsCoordinateReferenceSystem::createFromId( const long id, CrsType type )
{
bool result = false;
switch ( type )
{
case InternalCrsId:
result = createFromSrsId( id );
break;
case PostgisCrsId:
result = createFromSrid( id );
break;
case EpsgCrsId:
result = createFromOgcWmsCrs( QStringLiteral( "EPSG:%1" ).arg( id ) );
break;
default:
//THIS IS BAD...THIS PART OF CODE SHOULD NEVER BE REACHED...
QgsDebugMsg( "Unexpected case reached!" );
};
return result;
}
bool QgsCoordinateReferenceSystem::createFromString( const QString &definition )
{
sCrsStringLock.lockForRead();
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sStringCache.constFind( definition );
if ( crsIt != sStringCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sCrsStringLock.unlock();
return true;
}
sCrsStringLock.unlock();
bool result = false;
QRegularExpression reCrsId( "^(epsg|postgis|internal|user)\\:(\\d+)$", QRegularExpression::CaseInsensitiveOption );
QRegularExpressionMatch match = reCrsId.match( definition );
if ( match.capturedStart() == 0 )
{
QString authName = match.captured( 1 ).toLower();
CrsType type = InternalCrsId;
if ( authName == QLatin1String( "epsg" ) )
type = EpsgCrsId;
if ( authName == QLatin1String( "postgis" ) )
type = PostgisCrsId;
long id = match.captured( 2 ).toLong();
result = createFromId( id, type );
}
else
{
QRegularExpression reCrsStr( "^(?:(wkt|proj4)\\:)?(.+)$", QRegularExpression::CaseInsensitiveOption );
match = reCrsStr.match( definition );
if ( match.capturedStart() == 0 )
{
if ( match.captured( 1 ).compare( QLatin1String( "proj4" ), Qt::CaseInsensitive ) == 0 )
{
result = createFromProj4( match.captured( 2 ) );
//TODO: createFromProj4 used to save to the user database any new CRS
// this behavior was changed in order to separate creation and saving.
// Not sure if it necessary to save it here, should be checked by someone
// familiar with the code (should also give a more descriptive name to the generated CRS)
if ( srsid() == 0 )
{
QString myName = QStringLiteral( " * %1 (%2)" )
.arg( QObject::tr( "Generated CRS", "A CRS automatically generated from layer info get this prefix for description" ),
toProj4() );
saveAsUserCrs( myName );
}
}
else
{
result = createFromWkt( match.captured( 2 ) );
}
}
}
sCrsStringLock.lockForWrite();
sStringCache.insert( definition, *this );
sCrsStringLock.unlock();
return result;
}
bool QgsCoordinateReferenceSystem::createFromUserInput( const QString &definition )
{
QString userWkt;
char *wkt = nullptr;
OGRSpatialReferenceH crs = OSRNewSpatialReference( nullptr );
// make sure towgs84 parameter is loaded if using an ESRI definition and gdal >= 1.9
if ( definition.startsWith( QLatin1String( "ESRI::" ) ) )
{
setupESRIWktFix();
}
if ( OSRSetFromUserInput( crs, definition.toLocal8Bit().constData() ) == OGRERR_NONE )
{
if ( OSRExportToWkt( crs, &wkt ) == OGRERR_NONE )
{
userWkt = wkt;
CPLFree( wkt );
}
OSRDestroySpatialReference( crs );
}
//QgsDebugMsg( "definition: " + definition + " wkt = " + wkt );
return createFromWkt( userWkt );
}
void QgsCoordinateReferenceSystem::setupESRIWktFix()
{
// make sure towgs84 parameter is loaded if gdal >= 1.9
// this requires setting GDAL_FIX_ESRI_WKT=GEOGCS (see qgis bug #5598 and gdal bug #4673)
const char *configOld = CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" );
const char *configNew = "GEOGCS";
// only set if it was not set, to let user change the value if needed
if ( strcmp( configOld, "" ) == 0 )
{
CPLSetConfigOption( "GDAL_FIX_ESRI_WKT", configNew );
if ( strcmp( configNew, CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) != 0 )
QgsLogger::warning( QStringLiteral( "GDAL_FIX_ESRI_WKT could not be set to %1 : %2" )
.arg( configNew, CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) );
QgsDebugMsgLevel( QString( "set GDAL_FIX_ESRI_WKT : %1" ).arg( configNew ), 4 );
}
else
{
QgsDebugMsgLevel( QString( "GDAL_FIX_ESRI_WKT was already set : %1" ).arg( configNew ), 4 );
}
}
bool QgsCoordinateReferenceSystem::createFromOgcWmsCrs( const QString &crs )
{
sOgcLock.lockForRead();
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sOgcCache.constFind( crs );
if ( crsIt != sOgcCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sOgcLock.unlock();
return true;
}
sOgcLock.unlock();
QString wmsCrs = crs;
QRegExp re( "urn:ogc:def:crs:([^:]+).+([^:]+)", Qt::CaseInsensitive );
if ( re.exactMatch( wmsCrs ) )
{
wmsCrs = re.cap( 1 ) + ':' + re.cap( 2 );
}
else
{
re.setPattern( QStringLiteral( "(user|custom|qgis):(\\d+)" ) );
if ( re.exactMatch( wmsCrs ) && createFromSrsId( re.cap( 2 ).toInt() ) )
{
sOgcLock.lockForWrite();
sOgcCache.insert( crs, *this );
sOgcLock.unlock();
return true;
}
}
if ( loadFromDatabase( QgsApplication::srsDatabaseFilePath(), QStringLiteral( "lower(auth_name||':'||auth_id)" ), wmsCrs.toLower() ) )
{
sOgcLock.lockForWrite();
sOgcCache.insert( crs, *this );
sOgcLock.unlock();
return true;
}
// NAD27
if ( wmsCrs.compare( QLatin1String( "CRS:27" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS27" ), Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( QStringLiteral( "EPSG:4267" ) );
}
// NAD83
if ( wmsCrs.compare( QLatin1String( "CRS:83" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS83" ), Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( QStringLiteral( "EPSG:4269" ) );
}
// WGS84
if ( wmsCrs.compare( QLatin1String( "CRS:84" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS84" ), Qt::CaseInsensitive ) == 0 )
{
createFromOgcWmsCrs( QStringLiteral( "EPSG:4326" ) );
d.detach();
d->mAxisInverted = false;
d->mAxisInvertedDirty = false;
sOgcLock.lockForWrite();
sOgcCache.insert( crs, *this );
sOgcLock.unlock();
return d->mIsValid;
}
sOgcLock.lockForWrite();
sOgcCache.insert( crs, QgsCoordinateReferenceSystem() );
sOgcLock.unlock();
return false;
}
// Misc helper functions -----------------------
void QgsCoordinateReferenceSystem::validate()
{
if ( d->mIsValid )
return;
d.detach();
// try to validate using custom validation routines
if ( mCustomSrsValidation )
mCustomSrsValidation( *this );
if ( !d->mIsValid )
{
*this = QgsCoordinateReferenceSystem::fromOgcWmsCrs( GEO_EPSG_CRS_AUTHID );
}
}
bool QgsCoordinateReferenceSystem::createFromSrid( const long id )
{
sSrIdCacheLock.lockForRead();
QHash< long, QgsCoordinateReferenceSystem >::const_iterator crsIt = sSrIdCache.constFind( id );
if ( crsIt != sSrIdCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sSrIdCacheLock.unlock();
return true;
}
sSrIdCacheLock.unlock();
bool result = loadFromDatabase( QgsApplication::srsDatabaseFilePath(), QStringLiteral( "srid" ), QString::number( id ) );
sSrIdCacheLock.lockForWrite();
sSrIdCache.insert( id, *this );
sSrIdCacheLock.unlock();
return result;
}
bool QgsCoordinateReferenceSystem::createFromSrsId( const long id )
{
sCRSSrsIdLock.lockForRead();
QHash< long, QgsCoordinateReferenceSystem >::const_iterator crsIt = sSrsIdCache.constFind( id );
if ( crsIt != sSrsIdCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sCRSSrsIdLock.unlock();
return true;
}
sCRSSrsIdLock.unlock();
bool result = loadFromDatabase( id < USER_CRS_START_ID ? QgsApplication::srsDatabaseFilePath() :
QgsApplication::qgisUserDatabaseFilePath(),
QStringLiteral( "srs_id" ), QString::number( id ) );
sCRSSrsIdLock.lockForWrite();
sSrsIdCache.insert( id, *this );
sCRSSrsIdLock.unlock();
return result;
}
bool QgsCoordinateReferenceSystem::loadFromDatabase( const QString &db, const QString &expression, const QString &value )
{
d.detach();
QgsDebugMsgLevel( "load CRS from " + db + " where " + expression + " is " + value, 3 );
d->mIsValid = false;
d->mWkt.clear();
QFileInfo myInfo( db );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + db + " does not exist!" );
return d->mIsValid;
}
sqlite3_database_unique_ptr database;
sqlite3_statement_unique_ptr statement;
int myResult;
//check the db is available
myResult = openDatabase( db, database );
if ( myResult != SQLITE_OK )
{
return d->mIsValid;
}
/*
srs_id INTEGER PRIMARY KEY,
description text NOT NULL,
projection_acronym text NOT NULL,
ellipsoid_acronym NOT NULL,
parameters text NOT NULL,
srid integer NOT NULL,
auth_name varchar NOT NULL,
auth_id integer NOT NULL,
is_geo integer NOT NULL);
*/
QString mySql = "select srs_id,description,projection_acronym,"
"ellipsoid_acronym,parameters,srid,auth_name||':'||auth_id,is_geo "
"from tbl_srs where " + expression + '=' + QgsSqliteUtils::quotedString( value ) + " order by deprecated";
statement = database.prepare( mySql, myResult );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && statement.step() == SQLITE_ROW )
{
d->mSrsId = statement.columnAsText( 0 ).toLong();
d->mDescription = statement.columnAsText( 1 );
d->mProjectionAcronym = statement.columnAsText( 2 );
d->mEllipsoidAcronym = statement.columnAsText( 3 );
d->mProj4 = statement.columnAsText( 4 );
d->mSRID = statement.columnAsText( 5 ).toLong();
d->mAuthId = statement.columnAsText( 6 );
d->mIsGeographic = statement.columnAsText( 7 ).toInt() != 0;
d->mAxisInvertedDirty = true;
if ( d->mSrsId >= USER_CRS_START_ID && d->mAuthId.isEmpty() )
{
d->mAuthId = QStringLiteral( "USER:%1" ).arg( d->mSrsId );
}
else if ( d->mAuthId.startsWith( QLatin1String( "EPSG:" ), Qt::CaseInsensitive ) )
{
OSRDestroySpatialReference( d->mCRS );
d->mCRS = OSRNewSpatialReference( nullptr );
d->mIsValid = OSRSetFromUserInput( d->mCRS, d->mAuthId.toLower().toLatin1() ) == OGRERR_NONE;
setMapUnits();
}
if ( !d->mIsValid )
{
setProj4String( d->mProj4 );
}
}
else
{
QgsDebugMsgLevel( "failed : " + mySql, 4 );
}
return d->mIsValid;
}
bool QgsCoordinateReferenceSystem::hasAxisInverted() const
{
if ( d->mAxisInvertedDirty )
{
OGRAxisOrientation orientation;
OSRGetAxis( d->mCRS, OSRIsGeographic( d->mCRS ) ? "GEOGCS" : "PROJCS", 0, &orientation );
// If axis orientation is unknown, try again with OSRImportFromEPSGA for EPSG crs
if ( orientation == OAO_Other && d->mAuthId.startsWith( QLatin1String( "EPSG:" ), Qt::CaseInsensitive ) )
{
OGRSpatialReferenceH crs = OSRNewSpatialReference( nullptr );
if ( OSRImportFromEPSGA( crs, d->mAuthId.midRef( 5 ).toInt() ) == OGRERR_NONE )
{
OSRGetAxis( crs, OSRIsGeographic( crs ) ? "GEOGCS" : "PROJCS", 0, &orientation );
}
OSRDestroySpatialReference( crs );
}
d->mAxisInverted = orientation == OAO_North;
d->mAxisInvertedDirty = false;
}
return d->mAxisInverted;
}
bool QgsCoordinateReferenceSystem::createFromWkt( const QString &wkt )
{
d.detach();
sCRSWktLock.lockForRead();
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sWktCache.constFind( wkt );
if ( crsIt != sWktCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sCRSWktLock.unlock();
return true;
}
sCRSWktLock.unlock();
d->mIsValid = false;
d->mWkt.clear();
d->mProj4.clear();
if ( wkt.isEmpty() )
{
QgsDebugMsgLevel( "theWkt is uninitialized, operation failed", 4 );
return d->mIsValid;
}
QByteArray ba = wkt.toLatin1();
const char *pWkt = ba.data();
OGRErr myInputResult = OSRImportFromWkt( d->mCRS, const_cast< char ** >( & pWkt ) );
if ( myInputResult != OGRERR_NONE )
{
QgsDebugMsg( "\n---------------------------------------------------------------" );
QgsDebugMsg( "This CRS could *** NOT *** be set from the supplied Wkt " );
QgsDebugMsg( "INPUT: " + wkt );
QgsDebugMsg( QString( "UNUSED WKT: %1" ).arg( pWkt ) );
QgsDebugMsg( "---------------------------------------------------------------\n" );
sCRSWktLock.lockForWrite();
sWktCache.insert( wkt, *this );
sCRSWktLock.unlock();
return d->mIsValid;
}
if ( OSRAutoIdentifyEPSG( d->mCRS ) == OGRERR_NONE )
{
QString authid = QStringLiteral( "%1:%2" )
.arg( OSRGetAuthorityName( d->mCRS, nullptr ),
OSRGetAuthorityCode( d->mCRS, nullptr ) );
bool result = createFromOgcWmsCrs( authid );
sCRSWktLock.lockForWrite();
sWktCache.insert( wkt, *this );
sCRSWktLock.unlock();
return result;
}
// always morph from esri as it doesn't hurt anything
// FW: Hey, that's not right! It can screw stuff up! Disable
//myOgrSpatialRef.morphFromESRI();
// create the proj4 structs needed for transforming
char *proj4src = nullptr;
OSRExportToProj4( d->mCRS, &proj4src );
//now that we have the proj4string, delegate to createFromProj4 so
// that we can try to fill in the remaining class members...
//create from Proj will set the isValidFlag
if ( !createFromProj4( proj4src ) )
{
CPLFree( proj4src );
// try fixed up version
OSRFixup( d->mCRS );
OSRExportToProj4( d->mCRS, &proj4src );
createFromProj4( proj4src );
}
//TODO: createFromProj4 used to save to the user database any new CRS
// this behavior was changed in order to separate creation and saving.
// Not sure if it necessary to save it here, should be checked by someone
// familiar with the code (should also give a more descriptive name to the generated CRS)
if ( d->mSrsId == 0 )
{
QString myName = QStringLiteral( " * %1 (%2)" )
.arg( QObject::tr( "Generated CRS", "A CRS automatically generated from layer info get this prefix for description" ),
toProj4() );
saveAsUserCrs( myName );
}
CPLFree( proj4src );
sCRSWktLock.lockForWrite();
sWktCache.insert( wkt, *this );
sCRSWktLock.unlock();
return d->mIsValid;
//setMapunits will be called by createfromproj above
}
bool QgsCoordinateReferenceSystem::isValid() const
{
return d->mIsValid;
}
bool QgsCoordinateReferenceSystem::createFromProj4( const QString &proj4String )
{
d.detach();
sProj4CacheLock.lockForRead();
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sProj4Cache.constFind( proj4String );
if ( crsIt != sProj4Cache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
sProj4CacheLock.unlock();
return true;
}
sProj4CacheLock.unlock();
//
// Examples:
// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0
// +ellps=clrk80 +towgs84=-255,-15,71,0,0,0,0 +units=m +no_defs
//
// +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=2.337229166666664 +k_0=0.99987742
// +x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515.000000472 +units=m +no_defs
//
QString myProj4String = proj4String.trimmed();
d->mIsValid = false;
d->mWkt.clear();
QRegExp myProjRegExp( "\\+proj=(\\S+)" );
int myStart = myProjRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
sProj4CacheLock.lockForWrite();
sProj4Cache.insert( proj4String, *this );
sProj4CacheLock.unlock();
return d->mIsValid;
}
d->mProjectionAcronym = myProjRegExp.cap( 1 );
QRegExp myEllipseRegExp( "\\+ellps=(\\S+)" );
myStart = myEllipseRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
d->mEllipsoidAcronym.clear();
}
else
{
d->mEllipsoidAcronym = myEllipseRegExp.cap( 1 );
}
QRegExp myAxisRegExp( "\\+a=(\\S+)" );
myStart = myAxisRegExp.indexIn( myProj4String );
long mySrsId = 0;
QgsCoordinateReferenceSystem::RecordMap myRecord;
/*
* We try to match the proj string to and srsid using the following logic:
* - perform a whole text search on proj4 string (if not null)
*/
myRecord = getRecord( "select * from tbl_srs where parameters=" + QgsSqliteUtils::quotedString( myProj4String ) + " order by deprecated" );
if ( myRecord.empty() )
{
// Ticket #722 - aaronr
// Check if we can swap the lat_1 and lat_2 params (if they exist) to see if we match...
// First we check for lat_1 and lat_2
QRegExp myLat1RegExp( "\\+lat_1=\\S+" );
QRegExp myLat2RegExp( "\\+lat_2=\\S+" );
int myStart1 = 0;
int myLength1 = 0;
int myStart2 = 0;
int myLength2 = 0;
QString lat1Str;
QString lat2Str;
myStart1 = myLat1RegExp.indexIn( myProj4String, myStart1 );
myStart2 = myLat2RegExp.indexIn( myProj4String, myStart2 );
if ( myStart1 != -1 && myStart2 != -1 )
{
myLength1 = myLat1RegExp.matchedLength();
myLength2 = myLat2RegExp.matchedLength();
lat1Str = myProj4String.mid( myStart1 + LAT_PREFIX_LEN, myLength1 - LAT_PREFIX_LEN );
lat2Str = myProj4String.mid( myStart2 + LAT_PREFIX_LEN, myLength2 - LAT_PREFIX_LEN );
}
// If we found the lat_1 and lat_2 we need to swap and check to see if we can find it...
if ( !lat1Str.isEmpty() && !lat2Str.isEmpty() )
{
// Make our new string to check...
QString proj4StringModified = myProj4String;
// First just swap in the lat_2 value for lat_1 value
proj4StringModified.replace( myStart1 + LAT_PREFIX_LEN, myLength1 - LAT_PREFIX_LEN, lat2Str );
// Now we have to find the lat_2 location again since it has potentially moved...
myStart2 = 0;
myStart2 = myLat2RegExp.indexIn( proj4String, myStart2 );
proj4StringModified.replace( myStart2 + LAT_PREFIX_LEN, myLength2 - LAT_PREFIX_LEN, lat1Str );
QgsDebugMsgLevel( "trying proj4string match with swapped lat_1,lat_2", 4 );
myRecord = getRecord( "select * from tbl_srs where parameters=" + QgsSqliteUtils::quotedString( proj4StringModified.trimmed() ) + " order by deprecated" );
}
}
if ( myRecord.empty() )
{
// match all parameters individually:
// - order of parameters doesn't matter
// - found definition may have more parameters (like +towgs84 in GDAL)
// - retry without datum, if no match is found (looks like +datum<>WGS84 was dropped in GDAL)
QString sql = QStringLiteral( "SELECT * FROM tbl_srs WHERE " );
QString delim;
QString datum;
// split on spaces followed by a plus sign (+) to deal
// also with parameters containing spaces (e.g. +nadgrids)
// make sure result is trimmed (#5598)
QStringList myParams;
Q_FOREACH ( const QString ¶m, myProj4String.split( QRegExp( "\\s+(?=\\+)" ), QString::SkipEmptyParts ) )
{
QString arg = QStringLiteral( "' '||parameters||' ' LIKE %1" ).arg( QgsSqliteUtils::quotedString( QStringLiteral( "% %1 %" ).arg( param.trimmed() ) ) );
if ( param.startsWith( QLatin1String( "+datum=" ) ) )
{
datum = arg;
}
else
{
sql += delim + arg;
delim = QStringLiteral( " AND " );
myParams << param.trimmed();
}
}
if ( !datum.isEmpty() )
{
myRecord = getRecord( sql + delim + datum + " order by deprecated" );
}
if ( myRecord.empty() )
{
// datum might have disappeared in definition - retry without it
myRecord = getRecord( sql + " order by deprecated" );
}
if ( !myRecord.empty() )
{
// Bugfix 8487 : test param lists are equal, except for +datum
QStringList foundParams;
Q_FOREACH ( const QString ¶m, myRecord["parameters"].split( QRegExp( "\\s+(?=\\+)" ), QString::SkipEmptyParts ) )
{
if ( !param.startsWith( QLatin1String( "+datum=" ) ) )
foundParams << param.trimmed();
}
myParams.sort();
foundParams.sort();
if ( myParams != foundParams )
{
myRecord.clear();
}
}
}
if ( !myRecord.empty() )
{
mySrsId = myRecord[QStringLiteral( "srs_id" )].toLong();
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
}
else
{
// Last ditch attempt to piece together what we know of the projection to find a match...
setProj4String( myProj4String );
mySrsId = findMatchingProj();
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
else
{
d->mIsValid = false;
}
}
// if we failed to look up the projection in database, don't worry. we can still use it :)
if ( !d->mIsValid )
{
QgsDebugMsgLevel( "Projection is not found in databases.", 4 );
//setProj4String will set mIsValidFlag to true if there is no issue
setProj4String( myProj4String );
}
sProj4CacheLock.lockForWrite();
sProj4Cache.insert( proj4String, *this );
sProj4CacheLock.unlock();
return d->mIsValid;
}
//private method meant for internal use by this class only
QgsCoordinateReferenceSystem::RecordMap QgsCoordinateReferenceSystem::getRecord( const QString &sql )
{
QString myDatabaseFileName;
QgsCoordinateReferenceSystem::RecordMap myMap;
QString myFieldName;
QString myFieldValue;
sqlite3_database_unique_ptr database;
sqlite3_statement_unique_ptr statement;
int myResult;
// Get the full path name to the sqlite3 spatial reference database.
myDatabaseFileName = QgsApplication::srsDatabaseFilePath();
QFileInfo myInfo( myDatabaseFileName );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + myDatabaseFileName + " does not exist!" );
return myMap;
}
//check the db is available
myResult = openDatabase( myDatabaseFileName, database );
if ( myResult != SQLITE_OK )
{
return myMap;
}
statement = database.prepare( sql, myResult );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && statement.step() == SQLITE_ROW )
{
int myColumnCount = statement.columnCount();
//loop through each column in the record adding its expression name and value to the map
for ( int myColNo = 0; myColNo < myColumnCount; myColNo++ )
{
myFieldName = statement.columnName( myColNo );
myFieldValue = statement.columnAsText( myColNo );
myMap[myFieldName] = myFieldValue;
}
if ( statement.step() != SQLITE_DONE )
{
QgsDebugMsgLevel( "Multiple records found in srs.db", 4 );
myMap.clear();
}
}
else
{
QgsDebugMsgLevel( "failed : " + sql, 4 );
}
if ( myMap.empty() )
{
myDatabaseFileName = QgsApplication::qgisUserDatabaseFilePath();
QFileInfo myFileInfo;
myFileInfo.setFile( myDatabaseFileName );
if ( !myFileInfo.exists() )
{
QgsDebugMsg( "user qgis.db not found" );
return myMap;
}
//check the db is available
myResult = openDatabase( myDatabaseFileName, database );
if ( myResult != SQLITE_OK )
{
return myMap;
}
statement = database.prepare( sql, myResult );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && statement.step() == SQLITE_ROW )
{
int myColumnCount = statement.columnCount();
//loop through each column in the record adding its field name and value to the map
for ( int myColNo = 0; myColNo < myColumnCount; myColNo++ )
{
myFieldName = statement.columnName( myColNo );
myFieldValue = statement.columnAsText( myColNo );
myMap[myFieldName] = myFieldValue;
}
if ( statement.step() != SQLITE_DONE )
{
QgsDebugMsgLevel( "Multiple records found in srs.db", 4 );
myMap.clear();
}
}
else
{
QgsDebugMsgLevel( "failed : " + sql, 4 );
}
}
return myMap;
}
// Accessors -----------------------------------
long QgsCoordinateReferenceSystem::srsid() const
{
return d->mSrsId;
}
long QgsCoordinateReferenceSystem::postgisSrid() const
{
return d->mSRID;
}
QString QgsCoordinateReferenceSystem::authid() const
{
return d->mAuthId;
}
QString QgsCoordinateReferenceSystem::description() const
{
if ( d->mDescription.isNull() )
{
return QString();
}
else
{
return d->mDescription;
}
}
QString QgsCoordinateReferenceSystem::projectionAcronym() const
{
if ( d->mProjectionAcronym.isNull() )
{
return QString();
}
else