Class Extensions

Provides useful Extension Methods for use elsewhere in the Library.

Inheritance

System.Object

Extensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: VDS.RDF

Assembly: dotNetRdf.dll

Syntax

public static class Extensions

Methods

AddToList(IGraph, INode, IEnumerable<INode>)

Adds new items to the end of a list (aka a RDF collection).

Declaration

public static void AddToList(this IGraph g, INode listRoot, IEnumerable<INode> objects)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
INode	listRoot	Root Node for the list.
System.Collections.Generic.IEnumerable<T><INode>	objects	Objects to add to the collection.

AddToList<T>(IGraph, INode, IEnumerable<T>, Func<T, INode>)

Adds new items to the end of a list (aka a RDF collection).

Declaration

public static void AddToList<T>(this IGraph g, INode listRoot, IEnumerable<T> objects, Func<T, INode> mapFunc)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
INode	listRoot	Root Node for the list.
System.Collections.Generic.IEnumerable<T><T>	objects	Objects to add to the collection.
System.Func<T, TResult><T, INode>	mapFunc	Mapping from Object Type to INode.

Type Parameters

Name	Description
T	Type of Objects.

AppendIndented(StringBuilder, string, int)

Appends a String to the StringBuilder with an indent of indent spaces.

Declaration

public static void AppendIndented(this StringBuilder builder, string line, int indent)

Parameters

Type	Name	Description
System.Text.StringBuilder	builder	String Builder.
string	line	String to append.
int	indent	Indent.

AppendLineIndented(StringBuilder, string, int)

Appends a String to the StringBuilder with an indent of indent spaces.

Declaration

public static void AppendLineIndented(this StringBuilder builder, string line, int indent)

Parameters

Type	Name	Description
System.Text.StringBuilder	builder	String Builder.
string	line	String to append.
int	indent	Indent.

Remarks

Strings containing new lines are split over multiple lines.

AsEnumerable<T>(T)

Takes a single item and generates an IEnumerable containing only it.

Declaration

public static IEnumerable<T> AsEnumerable<T>(this T item)

Parameters

Type	Name	Description
T	item	Item to wrap in an IEnumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T	Type of the enumerable.

Remarks

This method taken from Stack Overflow - see. here

Assert(IGraph, INode, INode, INode)

Asserts a new Triple in the Graph.

Declaration

public static void Assert(this IGraph g, INode subj, INode pred, INode obj)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
INode	subj	Subject.
INode	pred	Predicate.
INode	obj	Object.

Remarks

Handy method which means you can assert a Triple by specifying the Subject, Predicate and Object without having to explicity declare a new Triple.

AssertList(IGraph, IEnumerable<INode>)

Asserts a list as a RDF collection and returns the node that represents the root of the RDF collection.

Declaration

public static INode AssertList(this IGraph g, IEnumerable<INode> objects)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
System.Collections.Generic.IEnumerable<T><INode>	objects	Objects to place in the collection.

Returns

Type	Description
INode	Either the blank node which is the root of the collection or rdf:nil for empty collections.

AssertList(IGraph, INode, IEnumerable<INode>)

Asserts a list as a RDF collection using an existing node as the list root.

Declaration

public static void AssertList(this IGraph g, INode listRoot, IEnumerable<INode> objects)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
INode	listRoot	Root Node for List.
System.Collections.Generic.IEnumerable<T><INode>	objects	Objects to place in the collection.

AssertList<T>(IGraph, IEnumerable<T>, Func<T, INode>)

Asserts a list as a RDF collection and returns the node that represents the root of the RDF collection.

Declaration

public static INode AssertList<T>(this IGraph g, IEnumerable<T> objects, Func<T, INode> mapFunc)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
System.Collections.Generic.IEnumerable<T><T>	objects	Objects to place in the collection.
System.Func<T, TResult><T, INode>	mapFunc	Mapping from Object Type to INode.

Returns

Type	Description
INode	Either the blank node which is the root of the collection or rdf:nil for empty collections.

Type Parameters

Name	Description
T	Type of Objects.

AssertList<T>(IGraph, INode, IEnumerable<T>, Func<T, INode>)

Asserts a list as a RDF collection using an existing node as the list root.

Declaration

public static void AssertList<T>(this IGraph g, INode listRoot, IEnumerable<T> objects, Func<T, INode> mapFunc)

Parameters

Type	Name	Description
IGraph	g	Graph to assert in.
INode	listRoot	Root Node for List.
System.Collections.Generic.IEnumerable<T><T>	objects	Objects to place in the collection.
System.Func<T, TResult><T, INode>	mapFunc	Mapping from Object Type to INode.

Type Parameters

Name	Description
T	Type of Objects.

BlankNodes(IEnumerable<INode>)

Gets the Blank Nodes.

Declaration

public static IEnumerable<IBlankNode> BlankNodes(this IEnumerable<INode> ns)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><INode>	ns	Nodes.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><IBlankNode>

ChunkBy<T>(IEnumerable<T>, int)

Splits a sequence into bounded chunks.

Declaration

public static IEnumerable<T[]> ChunkBy<T>(this IEnumerable<T> source, int size)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	An Enumerable.
int	size	Max Chunk Size.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T[]>

Type Parameters

Name	Description
T	Type Parameter.

EffectiveBooleanValue(INode)

Calculates the Effective Boolean Value of a given Node according to the Sparql specification.

Declaration

public static bool EffectiveBooleanValue(this INode n)

Parameters

Type	Name	Description
INode	n	Node to computer EBV for.

Returns

Type	Description
System.Boolean

GetEnhancedHashCode(Uri)

Gets an Enhanced Hash Code for a Uri.

Declaration

public static int GetEnhancedHashCode(this Uri u)

Parameters

Type	Name	Description
System.Uri	u	Uri to get Hash Code for.

Returns

Type	Description
int

Remarks

The .Net System.Uri class Hash Code ignores the Fragment ID when computing the Hash Code which means that URIs with the same basic URI but different Fragment IDs have identical Hash Codes. This is perfectly acceptable and sensible behaviour for normal URI usage since Fragment IDs are only relevant to the Client and not the Server. But in the case of URIs in RDF the Fragment ID is significant and so we need in some circumstances to compute a Hash Code which includes this information.

GetListAsTriples(IGraph, INode)

Gets all the Triples that make up a list (aka a RDF collection).

Declaration

public static IEnumerable<Triple> GetListAsTriples(this IGraph g, INode listRoot)

Parameters

Type	Name	Description
IGraph	g	Graph.
INode	listRoot	Root Node for List.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><Triple>	Triples that make up the List.

GetListItems(IGraph, INode)

Gets all the Nodes which are the items of the list (aka the RDF collection).

Declaration

public static IEnumerable<INode> GetListItems(this IGraph g, INode listRoot)

Parameters

Type	Name	Description
IGraph	g	Graph.
INode	listRoot	Root Node for List.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><INode>	Nodes that are the items in the list.

GetListNodes(IGraph, INode)

Gets all the Nodes which are the intermediate nodes in the list (aka the RDF collection). These represents the nodes used to link the actual items of the list together rather than the actual items of the list.

Declaration

public static IEnumerable<INode> GetListNodes(this IGraph g, INode listRoot)

Parameters

Type	Name	Description
IGraph	g	Graph.
INode	listRoot	Root Node for List.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><INode>	Nodes that are the intermediate nodes of the list.

GetSha256Hash(string)

Gets a SHA256 Hash for a String.

Declaration

public static string GetSha256Hash(this string s)

Parameters

Type	Name	Description
string	s	String to hash.

Returns

Type	Description
string

GetSha256Hash(Uri)

Gets an SHA256 Hash for a URI.

Declaration

public static string GetSha256Hash(this Uri u)

Parameters

Type	Name	Description
System.Uri	u	URI to get Hash Code for.

Returns

Type	Description
string

GraphLiteralNodes(IEnumerable<INode>)

Gets the Graph Literal Nodes.

Declaration

public static IEnumerable<IGraphLiteralNode> GraphLiteralNodes(this IEnumerable<INode> ns)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><INode>	ns	Nodes.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><IGraphLiteralNode>

IsAscii(string)

Determines whether a string is ASCII.

Declaration

public static bool IsAscii(this string value)

Parameters

Type	Name	Description
string	value

Returns

Type	Description
System.Boolean

IsDisjoint<T>(IEnumerable<T>, IEnumerable<T>)

Determines whether the contents of two enumerables are disjoint.

Declaration

public static bool IsDisjoint<T>(this IEnumerable<T> x, IEnumerable<T> y)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	x	An Enumerable.
System.Collections.Generic.IEnumerable<T><T>	y	Another Enumerable.

Returns

Type	Description
System.Boolean

Type Parameters

Name	Description
T	Type Parameter.

IsListRoot(INode, IGraph)

Gets whether a given Node is valid as a List Root, this does not guarantee that the list itself is valid simply that the Node appears to be the root of a list.

Declaration

public static bool IsListRoot(this INode n, IGraph g)

Parameters

Type	Name	Description
INode	n	Node to check.
IGraph	g	Graph.

Returns

Type	Description
System.Boolean

Remarks

We consider a node to be a list root if there are no incoming rdf:rest triples and only a single outgoing rdf:first triple.

LiteralNodes(IEnumerable<INode>)

Gets the Literal Nodes.

Declaration

public static IEnumerable<ILiteralNode> LiteralNodes(this IEnumerable<INode> ns)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><INode>	ns	Nodes.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><ILiteralNode>

MapTriple(Triple, IGraph, Dictionary<INode, INode>)

Copies a Triple from one Graph mapping Nodes as appropriate.

Declaration

public static Triple MapTriple(this Triple t, IGraph target, Dictionary<INode, INode> mapping)

Parameters

Type	Name	Description
Triple	t	Triple to copy.
IGraph	target	TargetGraph.
System.Collections.Generic.Dictionary<TKey, TValue><INode, INode>	mapping	Mapping of Nodes.

Returns

Type	Description
Triple

RemoveFromList(IGraph, INode, IEnumerable<INode>)

Removes the given items from a list (aka a RDF collection), if an item occurs multiple times in the list all occurrences will be removed.

Declaration

public static void RemoveFromList(this IGraph g, INode listRoot, IEnumerable<INode> objects)

Parameters

Type	Name	Description
IGraph	g	Graph to retract from.
INode	listRoot	Root Node for the list.
System.Collections.Generic.IEnumerable<T><INode>	objects	Objects to remove from the collection.

RemoveFromList<T>(IGraph, INode, IEnumerable<T>, Func<T, INode>)

Removes the given items from a list (aka a RDF collection), if an item occurs multiple times in the list all occurrences will be removed.

Declaration

public static void RemoveFromList<T>(this IGraph g, INode listRoot, IEnumerable<T> objects, Func<T, INode> mapFunc)

Parameters

Type	Name	Description
IGraph	g	Graph to retract from.
INode	listRoot	Root Node for the list.
System.Collections.Generic.IEnumerable<T><T>	objects	Objects to remove from the collection.
System.Func<T, TResult><T, INode>	mapFunc	Mapping from Object Type to INode.

Type Parameters

Name	Description
T	Type of Objects.

Retract(IGraph, INode, INode, INode)

Retracts a Triple from the Graph.

Declaration

public static void Retract(this IGraph g, INode subj, INode pred, INode obj)

Parameters

Type	Name	Description
IGraph	g	Graph to retract from.
INode	subj	Subject.
INode	pred	Predicate.
INode	obj	Object.

Remarks

Handy method which means you can retract a Triple by specifying the Subject, Predicate and Object without having to explicity declare a new Triple.

RetractList(IGraph, INode)

Retracts a List (aka a RDF collection).

Declaration

public static void RetractList(this IGraph g, INode listRoot)

Parameters

Type	Name	Description
IGraph	g	Graph.
INode	listRoot	Root Node for List.

ToSafeString(object)

Gets either the String representation of the Object or the Empty String if the object is null.

Declaration

public static string ToSafeString(this object obj)

Parameters

Type	Name	Description
System.Object	obj	Object.

Returns

Type	Description
string

ToSafeString(Uri)

Gets either the String representation of the URI or the Empty String if the URI is null.

Declaration

public static string ToSafeString(this Uri u)

Parameters

Type	Name	Description
System.Uri	u	URI.

Returns

Type	Description
string

ToSafeUri(string, IUriFactory)

Turns a string into a safe URI.

Declaration

public static Uri ToSafeUri(this string str, IUriFactory uriFactory = null)

Parameters

Type	Name	Description
string	str	String.
IUriFactory	uriFactory	Factor to use when creating the URI. If not specified, the Root instance will be used.

Returns

Type	Description
System.Uri	Either null if the string is null/empty or a URI otherwise.

ToString(Uri, IUriFormatter)

Gets the String representation of the URI formatted using the given Formatter.

Declaration

public static string ToString(this Uri u, IUriFormatter formatter)

Parameters

Type	Name	Description
System.Uri	u	URI.
IUriFormatter	formatter	URI Formatter.

Returns

Type	Description
string

UriNodes(IEnumerable<INode>)

Gets the URI Nodes.

Declaration

public static IEnumerable<IUriNode> UriNodes(this IEnumerable<INode> ns)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><INode>	ns	Nodes.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><IUriNode>

VariableNodes(IEnumerable<INode>)

Gets the Variable Nodes.

Declaration

public static IEnumerable<IVariableNode> VariableNodes(this IEnumerable<INode> ns)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><INode>	ns	Nodes.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><IVariableNode>

WithObject(IEnumerable<Triple>, INode)

Gets the Subset of Triples from an existing Enumerable that have a given Object.

Declaration

public static IEnumerable<Triple> WithObject(this IEnumerable<Triple> ts, INode obj)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><Triple>	ts	Enumerable of Triples.
INode	obj	Object to match.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><Triple>

WithPredicate(IEnumerable<Triple>, INode)

Gets the Subset of Triples from an existing Enumerable that have a given Predicate.

Declaration

public static IEnumerable<Triple> WithPredicate(this IEnumerable<Triple> ts, INode predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><Triple>	ts	Enumerable of Triples.
INode	predicate	Predicate to match.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><Triple>

WithSubject(IEnumerable<Triple>, INode)

Gets the Subset of Triples from an existing Enumerable that have a given Subject.

Declaration

public static IEnumerable<Triple> WithSubject(this IEnumerable<Triple> ts, INode subject)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><Triple>	ts	Enumerable of Triples.
INode	subject	Subject to match.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><Triple>