-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
qgsalgorithmpackage.cpp
180 lines (151 loc) · 6.45 KB
/
qgsalgorithmpackage.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/***************************************************************************
qgsalgorithmpackage.cpp
---------------------
begin : November 2017
copyright : (C) 2017 by Nyall Dawson
email : nyall dot dawson at gmail dot 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 "qgsalgorithmpackage.h"
#include "qgsgeometryengine.h"
#include "qgsogrutils.h"
#include "qgsvectorfilewriter.h"
///@cond PRIVATE
QString QgsPackageAlgorithm::name() const
{
return QStringLiteral( "package" );
}
QString QgsPackageAlgorithm::displayName() const
{
return QObject::tr( "Package layers" );
}
QStringList QgsPackageAlgorithm::tags() const
{
return QObject::tr( "geopackage,collect,merge,combine" ).split( ',' );
}
QString QgsPackageAlgorithm::group() const
{
return QObject::tr( "Database" );
}
QString QgsPackageAlgorithm::groupId() const
{
return QStringLiteral( "database" );
}
void QgsPackageAlgorithm::initAlgorithm( const QVariantMap & )
{
addParameter( new QgsProcessingParameterMultipleLayers( QStringLiteral( "LAYERS" ), QObject::tr( "Input layers" ), QgsProcessing::TypeVector ) );
addParameter( new QgsProcessingParameterFileDestination( QStringLiteral( "OUTPUT" ), QObject::tr( "Destination GeoPackage" ), QObject::tr( "GeoPackage files (*.gpkg)" ) ) );
addParameter( new QgsProcessingParameterBoolean( QStringLiteral( "OVERWRITE" ), QObject::tr( "Overwrite existing GeoPackage" ), false ) );
addOutput( new QgsProcessingOutputFile( QStringLiteral( "OUTPUT" ), QObject::tr( "GeoPackage" ) ) );
addOutput( new QgsProcessingOutputMultipleLayers( QStringLiteral( "OUTPUT_LAYERS" ), QObject::tr( "Layers within new package" ) ) );
}
QString QgsPackageAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm collects a number of existing layers and packages them together into a single GeoPackage database." );
}
QgsPackageAlgorithm *QgsPackageAlgorithm::createInstance() const
{
return new QgsPackageAlgorithm();
}
QVariantMap QgsPackageAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
bool overwrite = parameterAsBool( parameters, QStringLiteral( "OVERWRITE" ), context );
QString packagePath = parameterAsString( parameters, QStringLiteral( "OUTPUT" ), context );
if ( packagePath.isEmpty() )
throw QgsProcessingException( QObject::tr( "No output file specified." ) );
// delete existing geopackage if it exists
if ( overwrite && QFile::exists( packagePath ) )
{
feedback->pushInfo( QObject::tr( "Removing existing file '%1'" ).arg( packagePath ) );
if ( !QFile( packagePath ).remove() )
{
throw QgsProcessingException( QObject::tr( "Could not remove existing file '%1'" ) );
}
}
OGRSFDriverH hGpkgDriver = OGRGetDriverByName( "GPKG" );
if ( !hGpkgDriver )
{
throw QgsProcessingException( QObject::tr( "GeoPackage driver not found." ) );
}
gdal::ogr_datasource_unique_ptr hDS( OGR_Dr_CreateDataSource( hGpkgDriver, packagePath.toUtf8().constData(), nullptr ) );
if ( !hDS )
throw QgsProcessingException( QObject::tr( "Creation of database failed (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
bool errored = false;
const QList< QgsMapLayer * > layers = parameterAsLayerList( parameters, QStringLiteral( "LAYERS" ), context );
QgsProcessingMultiStepFeedback multiStepFeedback( layers.count(), feedback );
QStringList outputLayers;
int i = 0;
for ( QgsMapLayer *layer : layers )
{
if ( feedback->isCanceled() )
break;
multiStepFeedback.setCurrentStep( i );
i++;
feedback->pushInfo( QObject::tr( "Packaging layer %1/%2: %3" ).arg( i ).arg( layers.count() ).arg( layer ? layer->name() : QString() ) );
if ( !layer )
{
// don't throw immediately - instead do what we can and error out later
feedback->pushDebugInfo( QObject::tr( "Error retrieving map layer." ) );
errored = true;
continue;
}
switch ( layer->type() )
{
case QgsMapLayer::VectorLayer:
{
if ( !packageVectorLayer( qobject_cast< QgsVectorLayer * >( layer ), packagePath,
context, &multiStepFeedback ) )
errored = true;
else
outputLayers.append( QStringLiteral( "%1|layername=%2" ).arg( packagePath, layer->name() ) );
break;
}
case QgsMapLayer::RasterLayer:
{
//not supported
feedback->pushDebugInfo( QObject::tr( "Raster layers are not currently supported." ) );
errored = true;
break;
}
case QgsMapLayer::PluginLayer:
//not supported
feedback->pushDebugInfo( QObject::tr( "Packaging plugin layers is not supported." ) );
errored = true;
break;
}
}
if ( errored )
throw QgsProcessingException( QObject::tr( "Error obtained while packaging one or more layers." ) );
QVariantMap outputs;
outputs.insert( QStringLiteral( "OUTPUT" ), packagePath );
outputs.insert( QStringLiteral( "OUTPUT_LAYERS" ), outputLayers );
return outputs;
}
bool QgsPackageAlgorithm::packageVectorLayer( QgsVectorLayer *layer, const QString &path, QgsProcessingContext &context,
QgsProcessingFeedback *feedback )
{
QgsVectorFileWriter::SaveVectorOptions options;
options.driverName = QStringLiteral( "GPKG" );
options.layerName = layer->name();
options.actionOnExistingFile = QgsVectorFileWriter::CreateOrOverwriteLayer;
options.fileEncoding = context.defaultEncoding();
options.feedback = feedback;
QString error;
if ( QgsVectorFileWriter::writeAsVectorFormat( layer, path, options, &error ) != QgsVectorFileWriter::NoError )
{
feedback->pushDebugInfo( QObject::tr( "Packaging layer failed: %1" ).arg( error ) );
return false;
}
else
{
return true;
}
}
///@endcond