Package org.apache.commons.rdf.simple

Class SimpleRDF

  • All Implemented Interfaces:
    RDF
    public class SimpleRDF
extends java.lang.Object
implements RDF
    Simple RDF implementation.

    The RDFTerm, Triple, Quad, Graph and Dataset instances created by SimpleRDF are simple in-memory Implementations that are not thread-safe or efficient, but which may be useful for testing and prototyping purposes.

    • Constructor Detail

      • SimpleRDF

        public SimpleRDF()

    • Method Detail

      • createBlankNode

        public BlankNode createBlankNode​(java.lang.String name)
        Description copied from interface: RDF
        Create a blank node based on the given name.

        All BlankNodes created with the given name on a particular instance of RDF MUST be equivalent according to BlankNode.equals(Object),

        The returned BlankNode MUST NOT be equal to BlankNode instances returned for any other name or those returned from RDF.createBlankNode().

        The returned BlankNode SHOULD NOT be equivalent to any BlankNodes created on a different RDF instance, e.g. different instances of RDF should produce different blank nodes for the same name unless they purposely are intending to create equivalent BlankNode instances (e.g. a reinstated Serializable factory).

        Specified by:
        createBlankNode in interface RDF
        Parameters:
        name - A non-empty, non-null, String that is unique to this blank node in the context of this RDF.
        Returns:
        A BlankNode for the given name

      • createGraph

        public Graph createGraph()
        Description copied from interface: RDF
        Create a new graph. It is undefined if the graph will be persisted by any underlying storage mechanism.
        Specified by:
        createGraph in interface RDF
        Returns:
        A new Graph

      • createDataset

        public Dataset createDataset()
                      throws java.lang.UnsupportedOperationException
        Description copied from interface: RDF
        Create a new dataset. It is undefined if the dataset will be persisted by any underlying storage mechanism.
        Specified by:
        createDataset in interface RDF
        Returns:
        A new Dataset
        Throws:
        java.lang.UnsupportedOperationException

      • createIRI

        public IRI createIRI​(java.lang.String iri)
        Description copied from interface: RDF
        Create an IRI from a (possibly escaped) String. The provided iri string MUST be valid according to the W3C RDF-1.1 IRI definition.
        Specified by:
        createIRI in interface RDF
        Parameters:
        iri - Internationalized Resource Identifier
        Returns:
        A new IRI

      • createLiteral

        public Literal createLiteral​(java.lang.String literal)
        Description copied from interface: RDF
        Create a simple literal. The provided lexical form should not be escaped in any sense, e.g. should not include "quotes" unless those are part of the literal value. The returned Literal MUST have a Literal.getLexicalForm() that is equal to the provided lexical form, MUST NOT have a Literal.getLanguageTag() present, and SHOULD return a Literal.getDatatype() that is equal to the IRI http://www.w3.org/2001/XMLSchema#string.
        Specified by:
        createLiteral in interface RDF
        Parameters:
        literal - The literal value in plain text
        Returns:
        The created Literal

      • createLiteral

        public Literal createLiteral​(java.lang.String literal,
                             IRI dataType)
        Description copied from interface: RDF
        Create a literal with the specified data type. The provided lexical form should not be escaped in any sense, e.g. should not include "quotes" unless those are part of the literal value. It is RECOMMENDED that the provided dataType is one of the RDF-compatible XSD types. The provided lexical form SHOULD be in the lexical space of the provided dataType. The returned Literal SHOULD have a Literal.getLexicalForm() that is equal to the provided lexicalForm, MUST NOT have a Literal.getLanguageTag() present, and MUST return a Literal.getDatatype() that is equivalent to the provided dataType IRI.
        Specified by:
        createLiteral in interface RDF
        Parameters:
        literal - The literal value
        dataType - The data type IRI for the literal value, e.g. http://www.w3.org/2001/XMLSchema#integer
        Returns:
        The created Literal

      • createLiteral

        public Literal createLiteral​(java.lang.String literal,
                             java.lang.String language)
        Description copied from interface: RDF
        Create a language-tagged literal. The provided lexical form should not be escaped in any sense, e.g. should not include "quotes" unless those are part of the literal value. The provided language tag MUST be valid according to BCP47, e.g. en. The provided language tag MAY be converted to lower case. The returned Literal SHOULD have a Literal.getLexicalForm() which is equal to the provided lexicalForm, MUST return a Literal.getDatatype() that is equal to the IRI http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, and MUST have a Literal.getLanguageTag() present which SHOULD be equal to the provided language tag (compared as String.toLowerCase(Locale) using Locale.ENGLISH).
        Specified by:
        createLiteral in interface RDF
        Parameters:
        literal - The literal value
        language - The non-empty language tag as defined by BCP47
        Returns:
        The created Literal

      • createTriple

        public Triple createTriple​(BlankNodeOrIRI subject,
                           IRI predicate,
                           RDFTerm object)
        Description copied from interface: RDF
        Create a triple. The returned Triple SHOULD have a Triple.getSubject() that is equal to the provided subject, a Triple.getPredicate() that is equal to the provided predicate, and a Triple.getObject() that is equal to the provided object.
        Specified by:
        createTriple in interface RDF
        Parameters:
        subject - The IRI or BlankNode that is the subject of the triple
        predicate - The IRI that is the predicate of the triple
        object - The IRI, BlankNode or Literal that is the object of the triple
        Returns:
        The created Triple

      • createQuad

        public Quad createQuad​(BlankNodeOrIRI graphName,
                       BlankNodeOrIRI subject,
                       IRI predicate,
                       RDFTerm object)
                throws java.lang.IllegalArgumentException
        Description copied from interface: RDF
        Create a quad.

        The returned Quad SHOULD have a Quad.getGraphName() that is equal to the provided graphName, a Quad.getSubject() that is equal to the provided subject, a Quad.getPredicate() that is equal to the provided predicate, and a Quad.getObject() that is equal to the provided object.

        Specified by:
        createQuad in interface RDF
        Parameters:
        graphName - The IRI or BlankNode that this quad belongs to, or null for the public graph
        subject - The IRI or BlankNode that is the subject of the quad
        predicate - The IRI that is the predicate of the quad
        object - The IRI, BlankNode or Literal that is the object of the quad
        Returns:
        The created Quad
        Throws:
        java.lang.IllegalArgumentException - If any of the provided arguments are not acceptable, e.g. because a Literal has a lexicalForm that is too large for an underlying storage.