15 #ifndef QGSVECTORDATAPROVIDER_H
16 #define QGSVECTORDATAPROVIDER_H
65 DeleteFeatures = 1 << 1,
67 ChangeAttributeValues = 1 << 2,
69 AddAttributes = 1 << 3,
71 DeleteAttributes = 1 << 4,
73 SaveAsShapefile = 1 << 5,
75 CreateSpatialIndex = 1 << 6,
79 ChangeGeometries = 1 << 8,
81 SelectGeometryAtId = 1 << 9,
83 RandomSelectGeometryAtId = 1 << 10,
85 SequentialSelectGeometryAtId = 1 << 11,
86 CreateAttributeIndex = 1 << 12,
88 SelectEncoding = 1 << 13,
90 SimplifyGeometries = 1 << 14,
92 SimplifyGeometriesWithTopologicalValidation = 1 << 15,
96 const static int EditingCapabilities = AddFeatures | DeleteFeatures |
97 ChangeAttributeValues | ChangeGeometries | AddAttributes | DeleteAttributes;
131 virtual QString storageType()
const;
148 virtual long featureCount()
const = 0;
155 virtual const QgsFields &fields()
const = 0;
161 virtual QString dataComment()
const;
171 virtual QVariant minimumValue(
int index );
181 virtual QVariant maximumValue(
int index );
191 virtual void uniqueValues(
int index, QList<QVariant> &uniqueValues,
int limit = -1 );
200 virtual void enumValues(
int index, QStringList& enumList ) { Q_UNUSED( index ); enumList.clear(); }
221 virtual bool addAttributes(
const QList<QgsField> &attributes );
240 virtual QVariant defaultValue(
int fieldId );
249 virtual bool changeGeometryValues(
QgsGeometryMap & geometry_map );
255 virtual bool createSpatialIndex();
258 virtual bool createAttributeIndex(
int field );
265 virtual int capabilities()
const;
270 QString capabilitiesString()
const;
275 virtual void setEncoding(
const QString& e );
280 QString encoding()
const;
285 int fieldNameIndex(
const QString& fieldName )
const;
290 QMap<QString, int> fieldNameMap()
const;
312 bool supportedType(
const QgsField &field )
const;
316 NativeType( QString typeDesc, QString typeName, QVariant::Type type,
int minLen = 0,
int maxLen = 0,
int minPrec = 0,
int maxPrec = 0 ) :
317 mTypeDesc( typeDesc ), mTypeName( typeName ), mType( type ), mMinLen( minLen ), mMaxLen( maxLen ), mMinPrec( minPrec ), mMaxPrec( maxPrec ) {};
332 const QList< NativeType > &nativeTypes()
const;
340 static const QStringList &availableEncodings();
358 QStringList errors();
367 static QVariant convertValue( QVariant::Type type, QString value );
370 void clearMinMaxCache();
371 void fillMinMaxCache();
391 void pushError( QString msg );
Wrapper for iterator of features from vector data provider or vector layer.
QMap< QgsFeatureId, QgsGeometry > QgsGeometryMap
bool mFetchGeom
True if geometry should be added to the features in nextFeature calls.
QMap< QString, QVariant::Type > mOldTypeList
old notation
QgsAttributeList mAttributesToFetch
List of attribute indices to fetch with nextFeature calls.
virtual void enumValues(int index, QStringList &enumList)
Returns the possible enum values of an attribute.
QSet< QgsFeatureId > QgsFeatureIds
QList< QgsFeature > QgsFeatureList
NativeType(QString typeDesc, QString typeName, QVariant::Type type, int minLen=0, int maxLen=0, int minPrec=0, int maxPrec=0)
Container of fields for a vector layer.
WkbType
Used for symbology operations.
Abstract base class for spatial data provider implementations.
QList< int > QgsAttributeList
virtual QgsAttributeList pkAttributeIndexes()
Return list of indexes of fields that make up the primary key.
virtual QgsAbstractFeatureSource * featureSource() const
Return feature source object that can be used for querying provider's data.
bool mFetchFeaturesWithoutGeom
should provider fetch also features that don't have geometry?
QSet< int > QgsAttributeIds
QTextCodec * mEncoding
Encoding.
virtual QgsAttrPalIndexNameHash palAttributeIndexNames() const
Return list of indexes to names for QgsPalLabeling fix.
Capability
enumeration with capabilities that providers might implement
This class wraps a request for features to a vector layer (or directly its vector data provider)...
QList< int > QgsAttributeList
QList< NativeType > mNativeTypes
The names of the providers native types.
Encapsulate a field in an attribute table or data source.
base class that can be used for any class that is capable of returning features
QStringList mErrors
list of errors
QMap< QgsFeatureId, QgsAttributeMap > QgsChangedAttributesMap
static QStringList smEncodings
virtual bool doesStrictFeatureTypeCheck() const
Returns true if the provider is strict about the type of inserted features (e.g.
QgsAttrPalIndexNameHash mAttrPalIndexName
Old-style mapping of index to name for QgsPalLabeling fix.
This is the base class for vector data providers.
QHash< int, QString > QgsAttrPalIndexNameHash
QMap< int, QVariant > mCacheMinValues
virtual bool isSaveAndLoadStyleToDBSupported()
It returns false by default.