23 QString QgsMergeVectorAlgorithm::name()
const
25 return QStringLiteral(
"mergevectorlayers" );
28 QString QgsMergeVectorAlgorithm::displayName()
const
30 return QObject::tr(
"Merge vector layers" );
33 QStringList QgsMergeVectorAlgorithm::tags()
const
35 return QObject::tr(
"vector,layers,collect,merge,combine" ).split(
',' );
38 QString QgsMergeVectorAlgorithm::group()
const
40 return QObject::tr(
"Vector general" );
43 QString QgsMergeVectorAlgorithm::groupId()
const
45 return QStringLiteral(
"vectorgeneral" );
48 void QgsMergeVectorAlgorithm::initAlgorithm(
const QVariantMap & )
51 addParameter(
new QgsProcessingParameterCrs( QStringLiteral(
"CRS" ), QObject::tr(
"Destination CRS" ), QVariant(),
true ) );
55 QString QgsMergeVectorAlgorithm::shortDescription()
const
57 return QObject::tr(
"Combines multiple vector layers of the same geometry type into a single one." );
60 QString QgsMergeVectorAlgorithm::shortHelpString()
const
62 return QObject::tr(
"This algorithm combines multiple vector layers of the same geometry type into a single one.\n\n"
63 "The attribute table of the resulting layer will contain the fields from all input layers. "
64 "If fields with the same name but different types are found then the exported field will be automatically converted into a string type field. "
65 "New fields storing the original layer name and source are also added.\n\n"
66 "If any input layers contain Z or M values, then the output layer will also contain these values. Similarly, "
67 "if any of the input layers are multi-part, the output layer will also be a multi-part layer.\n\n"
68 "Optionally, the destination coordinate reference system (CRS) for the merged layer can be set. If it is not set, the CRS will be "
69 "taken from the first input layer. All layers will all be reprojected to match this CRS." );
72 QgsMergeVectorAlgorithm *QgsMergeVectorAlgorithm::createInstance()
const
74 return new QgsMergeVectorAlgorithm();
79 const QList< QgsMapLayer * > layers = parameterAsLayerList( parameters, QStringLiteral(
"LAYERS" ), context );
82 long totalFeatureCount = 0;
102 feedback->
pushDebugInfo( QObject::tr(
"Error retrieving map layer." ) );
122 throw QgsProcessingException( QObject::tr(
"All layers must have same geometry type! Encountered a %1 layer when expecting a %2 layer." )
154 for (
QgsField &destField : outputFields )
156 if ( destField.name().compare( sourceField.name(), Qt::CaseInsensitive ) == 0 )
159 if ( destField.type() != sourceField.type() )
161 feedback->
pushWarning( QObject::tr(
"%1 field in layer %2 has different data type than the destination layer (%3 instead of %4). "
162 "%1 field will be converted to string type." )
163 .arg( sourceField.name(), vl->
name(), sourceField.typeName(), destField.typeName() ) );
164 destField.setType( QVariant::String );
165 destField.setSubType( QVariant::Invalid );
166 destField.setLength( 0 );
167 destField.setPrecision( 0 );
174 outputFields.append( sourceField );
178 bool addLayerField =
false;
179 if ( outputFields.lookupField( QStringLiteral(
"layer" ) ) < 0 )
181 outputFields.append(
QgsField( QStringLiteral(
"layer" ), QVariant::String, QString() ) );
182 addLayerField =
true;
184 bool addPathField =
false;
185 if ( outputFields.lookupField( QStringLiteral(
"path" ) ) < 0 )
187 outputFields.append(
QgsField( QStringLiteral(
"path" ), QVariant::String, QString() ) );
199 const double step = totalFeatureCount > 0 ? 100.0 / totalFeatureCount : 1;
212 feedback->
pushInfo( QObject::tr(
"Packaging layer %1/%2: %3" ).arg( layerNumber ).arg( layers.count() ).arg( layer->name() ) );
224 bool changed =
false;
247 for (
const QgsField &destField : outputFields )
249 if ( addLayerField && destField.name() == QLatin1String(
"layer" ) )
251 destAttributes.append( layer->name() );
254 else if ( addPathField && destField.name() == QLatin1String(
"path" ) )
256 destAttributes.append( layer->publicSource() );
260 QVariant destAttribute;
262 if ( sourceIndex >= 0 )
264 destAttribute = f.
attributes().at( sourceIndex );
266 destAttributes.append( destAttribute );
281 outputs.insert( QStringLiteral(
"OUTPUT" ), dest );
virtual bool addZValue(double zValue=0)=0
Adds a z-dimension to the geometry, initialized to a preset value.
bool is3D() const SIP_HOLDGIL
Returns true if the geometry is 3D and contains a z-value.
virtual bool addMValue(double mValue=0)=0
Adds a measure to the geometry, initialized to a preset value.
bool isMeasure() const SIP_HOLDGIL
Returns true if the geometry contains m values.
This class represents a coordinate reference system (CRS).
bool isValid() const
Returns whether this CRS is correctly initialized and usable.
QString authid() const
Returns the authority identifier for the CRS.
Wrapper for iterator of features from vector data provider or vector layer.
bool nextFeature(QgsFeature &f)
This class wraps a request for features to a vector layer (or directly its vector data provider).
@ FastInsert
Use faster inserts, at the cost of updating the passed features to reflect changes made at the provid...
@ RegeneratePrimaryKey
This flag indicates, that a primary key field cannot be guaranteed to be unique and the sink should i...
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
void setAttributes(const QgsAttributes &attrs)
Sets the feature's attributes.
bool hasGeometry() const
Returns true if the feature has an associated geometry.
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
bool isCanceled() const SIP_HOLDGIL
Tells whether the operation has been canceled already.
void setProgress(double progress)
Sets the current progress for the feedback object.
Encapsulate a field in an attribute table or data source.
Container of fields for a vector layer.
int lookupField(const QString &fieldName) const
Looks up field's index from the field name.
A geometry is the spatial representation of a feature.
const QgsAbstractGeometry * constGet() const SIP_HOLDGIL
Returns a non-modifiable (const) reference to the underlying abstract geometry primitive.
QgsAbstractGeometry * get()
Returns a modifiable (non-const) reference to the underlying abstract geometry primitive.
bool isMultipart() const SIP_HOLDGIL
Returns true if WKB of the geometry is of WKBMulti* type.
bool convertToMultiType()
Converts single type geometry into multitype geometry e.g.
Base class for all map layer types.
QgsCoordinateReferenceSystem crs
Contains information about the context in which a processing algorithm is executed.
QgsCoordinateTransformContext transformContext() const
Returns the coordinate transform context.
Custom exception class for processing related exceptions.
Base class for providing feedback from a processing algorithm.
virtual void pushInfo(const QString &info)
Pushes a general informational message from the algorithm.
virtual void pushWarning(const QString &warning)
Pushes a warning informational message from the algorithm.
virtual void pushDebugInfo(const QString &info)
Pushes an informational message containing debugging helpers from the algorithm.
A coordinate reference system parameter for processing algorithms.
A feature sink output for processing algorithms.
A parameter for processing algorithms which accepts multiple map layers.
@ TypeVector
Tables (i.e. vector layers with or without geometry). When used for a sink this indicates the sink ha...
Represents a vector layer which manages a vector based data sets.
Q_INVOKABLE QgsWkbTypes::Type wkbType() const FINAL
Returns the WKBType or WKBUnknown in case of error.
long long featureCount(const QString &legendKey) const
Number of features rendered with specified legend key.
QgsFeatureIterator getFeatures(const QgsFeatureRequest &request=QgsFeatureRequest()) const FINAL
Queries the layer for features specified in request.
QgsFields fields() const FINAL
Returns the list of fields of this layer.
static GeometryType geometryType(Type type) SIP_HOLDGIL
Returns the geometry type for a WKB type, e.g., both MultiPolygon and CurvePolygon would have a Polyg...
static QString geometryDisplayString(GeometryType type) SIP_HOLDGIL
Returns a display string for a geometry type.
static bool isMultiType(Type type) SIP_HOLDGIL
Returns true if the WKB type is a multi type.
static bool hasM(Type type) SIP_HOLDGIL
Tests whether a WKB type contains m values.
Type
The WKB type describes the number of dimensions a geometry has.
static QString displayString(Type type) SIP_HOLDGIL
Returns a non-translated display string type for a WKB type, e.g., the geometry name used in WKT geom...
static Type multiType(Type type) SIP_HOLDGIL
Returns the multi type for a WKB type.
static Type addZ(Type type) SIP_HOLDGIL
Adds the z dimension to a WKB type and returns the new type.
static bool hasZ(Type type) SIP_HOLDGIL
Tests whether a WKB type contains the z-dimension.
static Type addM(Type type) SIP_HOLDGIL
Adds the m dimension to a WKB type and returns the new type.
const QgsCoordinateReferenceSystem & outputCrs