grafter-2.rdf.protocols — grafter 2.1.12

Abstract functions for interacting with RDF & RDF backends, such as RDF4j.

add clj

(add target triples)

(add target graph triples)

(add target graph format triple-stream)

(add target graph base-uri format triple-stream)

Adds a sequence of statements to the specified datasink. Supports all the same targets as add-statement.

Takes an optional string/URI to use as a graph.

Depending on the target, this function will also write any prefixes associated with the rdf-writer to the target.

Returns target.

add-batched clj

(add-batched target triples)

(add-batched target graph-or-triples triples-or-batch-size)

(add-batched target graph triples batch-size)

Adds a collection of statements to a repository in batches. The batch size is optional and default-batch-size will be used if not specified. Some repository implementations cache added statements in memory until explicitly flushed which can cause out-of-memory errors if a large number of statements are added through add. Spliting the input sequence into batches limits the number of cached statements and therefore can reduce memory pressure.

add-statement clj

(add-statement target statement)

(add-statement target graph statement)

Add an RDF statement to the target datasink. Datasinks must implement grafter-2.rdf.protocols/ITripleWriteable.

Datasinks include RDF4j RDF repositories, connections and anything built by rdf-writer.

Takes an optional string/URI to use as a graph.

blank-node? clj/s multimethod

Predicate function that tests whether the supplied value is considered to be a blank node type.

BNode cljs

delete clj

(delete target quads)

(delete target graph triples)

Deletes a sequence of statements from the specified repository.

Takes an optional string/URI to use as a graph.

Returns target.

delete-batched clj

(delete-batched target quads)

(delete-batched target graph-or-quads triples-or-batch-size)

(delete-batched target graph triples batch-size)

Deletes a collection of statements from a repository in batches. The batch size is optional and default-batch-size will be used if not specified.

IDatatypeURI clj/s protocol

datatype-uri clj/s

(datatype-uri this)

Returns the RDF literals datatype URI as either a java.net.URI or grafter.vocabularies.core.URI, depending upon host platform

IGrafterRDFType clj/s protocol

This protocol coerces a backend RDF type, e.g. an RDF4j quad object into an equivalent Grafter RDF type. For example given an RDF4j quad it will convert it into a Grafter Quad.

->grafter-type clj/s

(->grafter-type this)

Convert a backend RDF Type into a Native Type

IRawValue clj/s protocol

raw-value clj/s

(raw-value this)

Returns the naked value of a literal. For native primitive values e.g. a java.lang.Integer or JS Boolean, this will return the supplied value (like identity). However for more complex types such as LangString's it will coerce the value into a more natural primitive type.

IRDFString clj/s protocol

lang clj/s

(lang this)

Return the strings language tag (as a clojure Keyword)

ISPARQLable clj protocol

NOTE this protocol is intended for low-level access. End users should use query instead.

Run an arbitrary SPARQL query. Works with ASK, DESCRIBE, CONSTRUCT and SELECT queries.

You can call this on a Repository however if you do you may in some cases cause a resource leak, for example if the sequence of results isn't fully consumed.

To use this without leaking resources it is recommended that you call ->connection on your repository, inside a with-open; and then consume all your results inside of a nested doseq/dorun/etc...

e.g.

(with-open [conn (->connection repo)]
   (doseq [res (query conn "SELECT * WHERE { ?s ?p ?o .}")]
      (println res)))

query-dataset clj

(query-dataset this sparql-string model)

(query-dataset this sparql-string model opts)

ISPARQLUpdateable clj protocol

update! clj

(update! this sparql-string)

Issue a SPARQL Update statement against the repository

IStatement clj/s protocol

An RDF triple or quad

context clj/s

(context statement)

object clj/s

(object statement)

predicate clj/s

(predicate statement)

subject clj/s

(subject statement)

ITransactable clj protocol

Low level protocol for transactions support. Most users probably want to use grafter-2.rdf4j.repository/with-transaction

begin clj

(begin repo)

Start a transaction

commit clj

(commit repo)

Commit a transaction

rollback clj

(rollback repo)

Rollback a transaction

ITripleDeleteable clj protocol

This protocol can be implemented by anything which you can delete statements from. For example a SPARQL Update Endpoint.

delete-statement clj

(delete-statement this statement)

(delete-statement this graph statement)

ITripleReadable clj protocol

Use the higher level wrapper function statements if you just wish to read in some RDF.

This protocol exists for implementers to hook in additional sources of statements.

Takes a source of statements or triples and converts it into a seq of triples.

A hash of options is passed to each implementation, they may be ignored or handled depending on the circumstance.

to-statements clj

(to-statements this options)

ITripleWriteable clj protocol

This protocol is implemented by anything which you can put statements into.

IURIable cljs protocol

->uri cljs

(->uri url)

Convert into a grafter.vocabularies.core/URI

LangString clj/s

language clj/s

(language s lang)

Create an RDF langauge string out of a value string and a given language tag. Language tags should be keywords representing the country code, e.g.

(language "Bonsoir" :fr)

literal clj/s

(literal val datatype-uri)

You can use this to declare an RDF typed literal value along with its URI. Note that there are implicit coercions already defined for many core clojure/java datatypes, so for common datatypes you shouldn't need this.

make-blank-node clj/s

(make-blank-node)

(make-blank-node id)

Construct a new blank node. If 0-arity is used a blank node with a new locally unique process id is used.

OffsetDate clj/s

Quad clj/s

rdf:langString clj/s deprecated

RDFLiteral clj/s

Triple clj

triple= clj/s

(triple= & quads)

Equality test for an RDF triple or quad, that checks whether the supplied RDF statements are equal in terms of RDFs semantics i.e. two quads will be equal regardless of their graph/context providing their subject, predicate and objects are equal.

Like clojure.core/= this function can be applied to any number of statements.

triple? clj/s

(triple? t)

Predicate function to test if object is a valid RDF triple.