Class BaseDataset

Abstract Base Class for Datasets which provides implementation of Active and Default Graph management.
Inheritance
System.Object
BaseDataset
BaseImmutableDataset
BaseTransactionalDataset
Implements
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: VDS.RDF.Query.Datasets
Assembly: dotNetRDF.dll
Syntax
public abstract class BaseDataset : ISparqlDataset

Constructors

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BaseDataset()

Creates a new Dataset.
Declaration
public BaseDataset()
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BaseDataset(Boolean)

Creates a new Dataset with the given Union Default Graph setting.
Declaration
public BaseDataset(bool unionDefaultGraph)
Parameters
Type Name Description
System.Boolean unionDefaultGraph Whether to use a Union Default Graph.
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BaseDataset(Uri)

Creates a new Dataset with a fixed Default Graph and without a Union Default Graph.
Declaration
public BaseDataset(Uri defaultGraphUri)
Parameters
Type Name Description
System.Uri defaultGraphUri

Properties

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ActiveGraphUris

Gets the Active Graph URIs.
Declaration
public IEnumerable<Uri> ActiveGraphUris { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.Uri>
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DefaultGraphUris

Gets the Default Graph URIs.
Declaration
public IEnumerable<Uri> DefaultGraphUris { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.Uri>
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Graphs

Gets all the Graphs in the Dataset.
Declaration
public abstract IEnumerable<IGraph> Graphs { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<IGraph>
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GraphUris

Gets all the URIs of Graphs in the Dataset.
Declaration
public abstract IEnumerable<Uri> GraphUris { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.Uri>
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HasTriples

Gets whether the Dataset has any Triples.
Declaration
public virtual bool HasTriples { get; }
Property Value
Type Description
System.Boolean
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InternalDefaultGraph

Gets a reference to the actual IGraph that is currently treated as the default graph.
Declaration
protected IGraph InternalDefaultGraph { get; }
Property Value
Type Description
IGraph
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Item[Uri]

Gets the Graph with the given URI from the Dataset.
Declaration
public virtual IGraph this[Uri graphUri] { get; }
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Property Value
Type Description
IGraph
Remarks

This property need only return a read-only view of the Graph, code which wishes to modify Graphs should use the GetModifiableGraph(Uri) method to guarantee a Graph they can modify and will be persisted to the underlying storage.

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Triples

Gets all the Triples in the Dataset.
Declaration
public IEnumerable<Triple> Triples { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<Triple>
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UsesUnionDefaultGraph

Gets whether the Default Graph is treated as being the union of all Graphs in the dataset when no Default Graph is otherwise set.
Declaration
public bool UsesUnionDefaultGraph { get; }
Property Value
Type Description
System.Boolean

Methods

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AddGraph(IGraph)

Adds a Graph to the Dataset.
Declaration
public abstract bool AddGraph(IGraph g)
Parameters
Type Name Description
IGraph g Graph.
Returns
Type Description
System.Boolean
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ContainsTriple(Triple)

Gets whether the Dataset contains a specific Triple.
Declaration
public bool ContainsTriple(Triple t)
Parameters
Type Name Description
Triple t Triple.
Returns
Type Description
System.Boolean
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ContainsTripleInternal(Triple)

Determines whether the Dataset contains a specific Triple.
Declaration
protected abstract bool ContainsTripleInternal(Triple t)
Parameters
Type Name Description
Triple t Triple to search for.
Returns
Type Description
System.Boolean
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Discard()

Ensures that any changes to the Dataset (if any) are discarded.
Declaration
public abstract void Discard()
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Flush()

Ensures that any changes to the Dataset (if any) are flushed to the underlying Storage.
Declaration
public abstract void Flush()
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GetAllTriples()

Abstract method that concrete implementations must implement to return an enumerable of all the Triples in the Dataset.
Declaration
protected abstract IEnumerable<Triple> GetAllTriples()
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetGraphInternal(Uri)

Gets the given Graph from the Dataset.
Declaration
protected abstract IGraph GetGraphInternal(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
IGraph
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GetModifiableGraph(Uri)

Gets the Graph with the given URI from the Dataset.
Declaration
public abstract IGraph GetModifiableGraph(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
IGraph
Remarks

Graphs returned from this method must be modifiable and the Dataset must guarantee that when it is Flushed or Disposed of that any changes to the Graph are persisted.

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GetTriplesWithObject(INode)

Gets all the Triples in the Dataset with the given Object.
Declaration
public IEnumerable<Triple> GetTriplesWithObject(INode obj)
Parameters
Type Name Description
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithObjectInternal(INode)

Gets all the Triples in the Dataset with the given Object.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithObjectInternal(INode obj)
Parameters
Type Name Description
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithPredicate(INode)

Gets all the Triples in the Dataset with the given Predicate.
Declaration
public IEnumerable<Triple> GetTriplesWithPredicate(INode pred)
Parameters
Type Name Description
INode pred Predicate.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithPredicateInternal(INode)

Gets all the Triples in the Dataset with the given Predicate.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithPredicateInternal(INode pred)
Parameters
Type Name Description
INode pred Predicate.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithPredicateObject(INode, INode)

Gets all the Triples in the Dataset with the given Predicate and Object.
Declaration
public IEnumerable<Triple> GetTriplesWithPredicateObject(INode pred, INode obj)
Parameters
Type Name Description
INode pred Predicate.
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithPredicateObjectInternal(INode, INode)

Gets all the Triples in the Dataset with the given Predicate and Object.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithPredicateObjectInternal(INode pred, INode obj)
Parameters
Type Name Description
INode pred Predicate.
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubject(INode)

Gets all the Triples in the Dataset with the given Subject.
Declaration
public IEnumerable<Triple> GetTriplesWithSubject(INode subj)
Parameters
Type Name Description
INode subj Subject.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubjectInternal(INode)

Gets all the Triples in the Dataset with the given Subject.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithSubjectInternal(INode subj)
Parameters
Type Name Description
INode subj Subject.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubjectObject(INode, INode)

Gets all the Triples in the Dataset with the given Subject and Object.
Declaration
public IEnumerable<Triple> GetTriplesWithSubjectObject(INode subj, INode obj)
Parameters
Type Name Description
INode subj Subject.
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubjectObjectInternal(INode, INode)

Gets all the Triples in the Dataset with the given Subject and Object.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithSubjectObjectInternal(INode subj, INode obj)
Parameters
Type Name Description
INode subj Subject.
INode obj Object.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubjectPredicate(INode, INode)

Gets all the Triples in the Dataset with the given Subject and Predicate.
Declaration
public IEnumerable<Triple> GetTriplesWithSubjectPredicate(INode subj, INode pred)
Parameters
Type Name Description
INode subj Subject.
INode pred Predicate.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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GetTriplesWithSubjectPredicateInternal(INode, INode)

Gets all the Triples in the Dataset with the given Subject and Predicate.
Declaration
protected abstract IEnumerable<Triple> GetTriplesWithSubjectPredicateInternal(INode subj, INode pred)
Parameters
Type Name Description
INode subj Subject.
INode pred Predicate.
Returns
Type Description
System.Collections.Generic.IEnumerable<Triple>
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HasGraph(Uri)

Gets whether a Graph with the given URI is the Dataset.
Declaration
public bool HasGraph(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
System.Boolean
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HasGraphInternal(Uri)

Determines whether a given Graph exists in the Dataset.
Declaration
protected abstract bool HasGraphInternal(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
System.Boolean
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RemoveGraph(Uri)

Removes a Graph from the Dataset.
Declaration
public virtual bool RemoveGraph(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
System.Boolean
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RemoveGraphInternal(Uri)

Removes a Graph from the Dataset.
Declaration
protected abstract bool RemoveGraphInternal(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.
Returns
Type Description
System.Boolean
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ResetActiveGraph()

Sets the Active Graph for the SPARQL query to be the previous Active Graph.
Declaration
public void ResetActiveGraph()
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ResetDefaultGraph()

Sets the Default Graph for the SPARQL Query to be the previous Default Graph.
Declaration
public void ResetDefaultGraph()
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SetActiveGraph(IEnumerable<Uri>)

Sets the Active Graph for the SPARQL query.
Declaration
public void SetActiveGraph(IEnumerable<Uri> graphUris)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.Uri> graphUris URIs of the Graphs which form the Active Graph.
Remarks
Helper function used primarily in the execution of GRAPH Clauses.
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SetActiveGraph(Uri)

Sets the Active Graph for the SPARQL query.
Declaration
public void SetActiveGraph(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Uri of the Active Graph.
Remarks
Helper function used primarily in the execution of GRAPH Clauses.
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SetDefaultGraph(IEnumerable<Uri>)

Sets the Default Graph.
Declaration
public void SetDefaultGraph(IEnumerable<Uri> graphUris)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.Uri> graphUris Graph URIs.
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SetDefaultGraph(Uri)

Sets the Default Graph.
Declaration
public void SetDefaultGraph(Uri graphUri)
Parameters
Type Name Description
System.Uri graphUri Graph URI.

Implements

Extension Methods