org.eclipse.rdf4j.model.util

Class Models

java.lang.Object

org.eclipse.rdf4j.model.util.Models

public class Models
extends Object

Utility functions for working with Models and other Statement collections.

Author:

Jeen Broekstra, Arjohn Kampman

See Also:

Model, ModelBuilder

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Models()

Method Summary

Modifier and Type	Method and Description
static Set<Value>	getProperties(Model m, Resource subject, IRI property, Resource... contexts) Retrieve all property values for the supplied subject and property from the given model.
static Optional<Value>	getProperty(Model m, Resource subject, IRI property, Resource... contexts) Retrieve a property value for the supplied subject from the given model.
static Optional<IRI>	getPropertyIRI(Model m, Resource subject, IRI property, Resource... contexts) Retrieve a property value as an IRI for the supplied subject from the given model.
static Set<IRI>	getPropertyIRIs(Model m, Resource subject, IRI property, Resource... contexts) Retrieve all property IRI values for the supplied subject and property from the given model.
static Optional<Literal>	getPropertyLiteral(Model m, Resource subject, IRI property, Resource... contexts) Retrieve a property value as a Literal for the supplied subject from the given model.
static Set<Literal>	getPropertyLiterals(Model m, Resource subject, IRI property, Resource... contexts) Retrieve all property Literal values for the supplied subject and property from the given model.
static Optional<Resource>	getPropertyResource(Model m, Resource subject, IRI property, Resource... contexts) Retrieve a property value as an IRI for the supplied subject from the given model.
static Set<Resource>	getPropertyResources(Model m, Resource subject, IRI property, Resource... contexts) Retrieve all property Resource values for the supplied subject and property from the given model.
static Optional<String>	getPropertyString(Model m, Resource subject, IRI property, Resource... contexts) Retrieve a property value as a String for the supplied subject from the given model.
static Set<String>	getPropertyStrings(Model m, Resource subject, IRI property, Resource... contexts) Retrieve all property values as Strings for the supplied subject and property from the given model.
static boolean	isomorphic(Iterable<? extends Statement> model1, Iterable<? extends Statement> model2) Compares two RDF models, and returns true if they consist of isomorphic graphs and the isomorphic graph identifiers map 1:1 to each other.
static boolean	isSubset(Iterable<? extends Statement> model1, Iterable<? extends Statement> model2) Compares two RDF models, and returns true if the first model is a subset of the second model, using graph isomorphism to map statements between models.
static boolean	isSubset(Set<? extends Statement> model1, Set<? extends Statement> model2) Compares two RDF models, and returns true if the first model is a subset of the second model, using graph isomorphism to map statements between models.
static java.util.function.Supplier<ModelException>	modelException(String message) Creates a Supplier of ModelException objects that be passed to Optional.orElseThrow(Supplier) to generate exceptions as necessary.
static Optional<Value>	object(Model m) Retrieves an object Value from the statements in the given model.
static Optional<IRI>	objectIRI(Model m) Retrieves an object IRI value from the statements in the given model.
static Set<IRI>	objectIRIs(Model m) Retrieves all object IRI values from the statements in the given model.
static Optional<Literal>	objectLiteral(Model m) Retrieves an object Literal value from the statements in the given model.
static Set<Literal>	objectLiterals(Model m) Retrieves all object Literal values from the statements in the given model.
static Optional<Resource>	objectResource(Model m) Retrieves an object Resource value from the statements in the given model.
static Set<Resource>	objectResources(Model m) Retrieves all object Resource values from the statements in the given model.
static Optional<String>	objectString(Model m) Retrieves an object value as a String from the statements in the given model.
static Set<String>	objectStrings(Model m) Retrieves all object String values from the statements in the given model.
static Optional<IRI>	predicate(Model m) Retrieves a predicate from the statements in the given model.
static Model	setProperty(Model m, Resource subject, IRI property, Value value, Resource... contexts) Sets the property value for the given subject to the given object value, replacing any existing value(s) for the subject's property.
static Model	stripContexts(Model model, Resource... contexts) Strips contexts from the input model.
static Optional<Resource>	subject(Model m) Retrieves a subject Resource from the statements in the given model.
static Optional<BNode>	subjectBNode(Model m) Retrieves a subject BNode from the statements in the given model.
static Set<BNode>	subjectBNodes(Model m) Retrieves all subject BNodes from the statements in the given model.
static Optional<IRI>	subjectIRI(Model m) Retrieves a subject IRI from the statements in the given model.
static Set<IRI>	subjectIRIs(Model m) Retrieves all subject IRIs from the statements in the given model.
static Model	synchronizedModel(Model toSynchronize) Make a model thread-safe by synchronizing all its methods.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Models

protected Models()

Method Detail

object

public static Optional<Value> object(Model m)

Retrieves an object Value from the statements in the given model. If more than one possible object value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

Returns:

an object value from the given model, or Optional.empty() if no such value exists.

objectLiteral

public static Optional<Literal> objectLiteral(Model m)

Retrieves an object Literal value from the statements in the given model. If more than one possible Literal value exists, any one Literal value is picked and returned.

Parameters:

m - the model from which to retrieve an object Literal value.

Returns:

an object Literal value from the given model, or Optional.empty() if no such value exists.

objectLiterals

public static Set<Literal> objectLiterals(Model m)

Retrieves all object Literal values from the statements in the given model.

Parameters:

m - the model from which to retrieve all object Literal values.

Returns:

a Set containing object Literal values from the given model, which will be empty if no such value exists.

See Also:

Model.objects()

objectResource

public static Optional<Resource> objectResource(Model m)

Retrieves an object Resource value from the statements in the given model. If more than one possible Resource value exists, any one Resource value is picked and returned.

Parameters:

m - the model from which to retrieve an object Resource value.

Returns:

an Optional object Resource value from the given model, which will be empty if no such value exists.

objectResources

public static Set<Resource> objectResources(Model m)

Retrieves all object Resource values from the statements in the given model.

Parameters:

m - the model from which to retrieve all object Resource values.

Returns:

a Set containing object Resource values from the given model, which will be empty if no such value exists.

See Also:

Model.objects()

objectIRI

public static Optional<IRI> objectIRI(Model m)

Retrieves an object IRI value from the statements in the given model. If more than one possible IRI value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object IRI value.

Returns:

an Optional object IRI value from the given model, which will be empty if no such value exists.

objectIRIs

public static Set<IRI> objectIRIs(Model m)

Retrieves all object IRI values from the statements in the given model.

Parameters:

m - the model from which to retrieve all object IRI values.

Returns:

a Set containing object IRI values from the given model, which will be empty if no such value exists.

See Also:

Model.objects()

objectString

public static Optional<String> objectString(Model m)

Retrieves an object value as a String from the statements in the given model. If more than one possible object value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object String value.

Returns:

an Optional object String value from the given model, which will be empty if no such value exists.

objectStrings

public static Set<String> objectStrings(Model m)

Retrieves all object String values from the statements in the given model.

Parameters:

m - the model from which to retrieve all object String values.

Returns:

a Set containing object String values from the given model, which will be empty if no such value exists.

See Also:

Model.objects()

subject

public static Optional<Resource> subject(Model m)

Retrieves a subject Resource from the statements in the given model. If more than one possible resource value exists, any one resource value is picked and returned.

Parameters:

m - the model from which to retrieve a subject Resource.

Returns:

an Optional subject resource from the given model, which will be empty if no such value exists.

subjectIRI

public static Optional<IRI> subjectIRI(Model m)

Retrieves a subject IRI from the statements in the given model. If more than one possible IRI value exists, any one IRI value is picked and returned.

Parameters:

m - the model from which to retrieve a subject IRI value.

Returns:

an Optional subject IRI value from the given model, which will be empty if no such value exists.

subjectIRIs

public static Set<IRI> subjectIRIs(Model m)

Retrieves all subject IRIs from the statements in the given model.

Parameters:

m - the model from which to retrieve a subject IRI value.

Returns:

a Set of subject IRI values from the given model. The returned Set may be empty.

subjectBNode

public static Optional<BNode> subjectBNode(Model m)

Retrieves a subject BNode from the statements in the given model. If more than one possible blank node value exists, any one blank node value is picked and returned.

Parameters:

m - the model from which to retrieve a subject BNode value.

Returns:

an Optional subject BNode value from the given model, which will be empty if no such value exists.

subjectBNodes

public static Set<BNode> subjectBNodes(Model m)

Retrieves all subject BNodes from the statements in the given model.

Parameters:

m - the model from which to retrieve a subject IRI value.

Returns:

a Set of subject BNode values from the given model. The returned Set may be empty.

predicate

public static Optional<IRI> predicate(Model m)

Retrieves a predicate from the statements in the given model. If more than one possible predicate value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve a predicate value.

Returns:

an Optional predicate value from the given model, which will be empty if no such value exists.

setProperty

public static Model setProperty(Model m,
                                Resource subject,
                                IRI property,
                                Value value,
                                Resource... contexts)

Sets the property value for the given subject to the given object value, replacing any existing value(s) for the subject's property. This method updates the original input Model and then returns that same Model object.

Parameters:

m - the model in which to set the property value. May not be null.

subject - the subject for which to set/replace the property value. May not be null.

property - the property for which to set/replace the value. May not be null.

value - the value to set for the given subject and property. May not be null.

contexts - the context(s) in which to set/replace the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

the Model object, containing the updated property value.

getProperty

public static Optional<Value> getProperty(Model m,
                                          Resource subject,
                                          IRI property,
                                          Resource... contexts)

Retrieve a property value for the supplied subject from the given model. If more than one property value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

subject - the subject resource for which to retrieve a property value.

property - the property for which to retrieve a value.

contexts - the contexts from which to retrieve the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a property value from the given model, or Optional.empty() if no such value exists.

getProperties

public static Set<Value> getProperties(Model m,
                                       Resource subject,
                                       IRI property,
                                       Resource... contexts)

Retrieve all property values for the supplied subject and property from the given model.

Parameters:

m - the model from which to retrieve the property values.

subject - the subject resource for which to retrieve all property values.

property - the property for which to retrieve all values.

contexts - the contexts from which to retrieve the property values. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a Set of all property values for the supplied input. The resulting set may be empty.

getPropertyResource

public static Optional<Resource> getPropertyResource(Model m,
                                                     Resource subject,
                                                     IRI property,
                                                     Resource... contexts)

Retrieve a property value as an IRI for the supplied subject from the given model. If more than one property value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

subject - the subject resource for which to retrieve a property value.

property - the property for which to retrieve a value.

contexts - the contexts from which to retrieve the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a property value Resource from the given model, or Optional.empty() if no such value exists.

getPropertyResources

public static Set<Resource> getPropertyResources(Model m,
                                                 Resource subject,
                                                 IRI property,
                                                 Resource... contexts)

Retrieve all property Resource values for the supplied subject and property from the given model.

Parameters:

m - the model from which to retrieve the property Resource values.

subject - the subject resource for which to retrieve all property Resource values.

property - the property for which to retrieve all Resource values.

contexts - the contexts from which to retrieve the property values. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a Set of all property Resource values for the supplied input. The resulting set may be empty.

getPropertyIRI

public static Optional<IRI> getPropertyIRI(Model m,
                                           Resource subject,
                                           IRI property,
                                           Resource... contexts)

Retrieve a property value as an IRI for the supplied subject from the given model. If more than one property value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

subject - the subject resource for which to retrieve a property value.

property - the property for which to retrieve a value.

contexts - the contexts from which to retrieve the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a property value IRI from the given model, or Optional.empty() if no such value exists.

getPropertyIRIs

public static Set<IRI> getPropertyIRIs(Model m,
                                       Resource subject,
                                       IRI property,
                                       Resource... contexts)

Retrieve all property IRI values for the supplied subject and property from the given model.

Parameters:

m - the model from which to retrieve the property IRI values.

subject - the subject resource for which to retrieve all property IRI values.

property - the property for which to retrieve all IRI values.

contexts - the contexts from which to retrieve the property values. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a Set of all property IRI values for the supplied input. The resulting set may be empty.

getPropertyLiteral

public static Optional<Literal> getPropertyLiteral(Model m,
                                                   Resource subject,
                                                   IRI property,
                                                   Resource... contexts)

Retrieve a property value as a Literal for the supplied subject from the given model. If more than one property value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

subject - the subject resource for which to retrieve a property literal value.

property - the property for which to retrieve a value.

contexts - the contexts from which to retrieve the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a property value Literal from the given model, or Optional.empty() if no such value exists.

getPropertyLiterals

public static Set<Literal> getPropertyLiterals(Model m,
                                               Resource subject,
                                               IRI property,
                                               Resource... contexts)

Retrieve all property Literal values for the supplied subject and property from the given model.

Parameters:

m - the model from which to retrieve the property Literal values.

subject - the subject resource for which to retrieve all property Literal values.

property - the property for which to retrieve all Literal values.

contexts - the contexts from which to retrieve the property values. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a Set of all property IRI values for the supplied input. The resulting set may be empty.

getPropertyString

public static Optional<String> getPropertyString(Model m,
                                                 Resource subject,
                                                 IRI property,
                                                 Resource... contexts)

Retrieve a property value as a String for the supplied subject from the given model. If more than one property value exists, any one value is picked and returned.

Parameters:

m - the model from which to retrieve an object value.

subject - the subject resource for which to retrieve a property literal value.

property - the property for which to retrieve a value.

contexts - the contexts from which to retrieve the property value. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a property value String from the given model, or Optional.empty() if no such value exists.

getPropertyStrings

public static Set<String> getPropertyStrings(Model m,
                                             Resource subject,
                                             IRI property,
                                             Resource... contexts)

Retrieve all property values as Strings for the supplied subject and property from the given model.

Parameters:

m - the model from which to retrieve the property values as Strings.

subject - the subject resource for which to retrieve all property values as Strings.

property - the property for which to retrieve all values as Strings.

contexts - the contexts from which to retrieve the property values. Optional vararg argument. If not specified the operations works on the entire Model.

Returns:

a Set of all property values as Strings for the supplied input. The resulting set may be empty.

isomorphic

public static boolean isomorphic(Iterable<? extends Statement> model1,
                                 Iterable<? extends Statement> model2)

Compares two RDF models, and returns true if they consist of isomorphic graphs and the isomorphic graph identifiers map 1:1 to each other. RDF graphs are isomorphic graphs if statements from one graphs can be mapped 1:1 on to statements in the other graphs. In this mapping, blank nodes are not considered mapped when having an identical internal id, but are mapped from one graph to the other by looking at the statements in which the blank nodes occur. A Model can consist of more than one graph (denoted by context identifiers). Two models are considered isomorphic if for each of the graphs in one model, an isomorphic graph exists in the other model, and the context identifiers of these graphs are either identical or (in the case of blank nodes) map 1:1 on each other.

See Also:

RDF Concepts & Abstract Syntax, section 3.6 (Graph Comparison)

isSubset

public static boolean isSubset(Iterable<? extends Statement> model1,
                               Iterable<? extends Statement> model2)

Compares two RDF models, and returns true if the first model is a subset of the second model, using graph isomorphism to map statements between models.

isSubset

public static boolean isSubset(Set<? extends Statement> model1,
                               Set<? extends Statement> model2)

Compares two RDF models, and returns true if the first model is a subset of the second model, using graph isomorphism to map statements between models.

stripContexts

public static Model stripContexts(Model model,
                                  Resource... contexts)

Strips contexts from the input model. This method provides a new Model containing all statements from the input model, with the supplied contexts removed from those statements.

Parameters:

model - the input model

contexts - the contexts to remove. This is a vararg and as such is optional. If not supplied, the method strips all contexts.

Returns:

a new Model object containg the same statements as the input model, with the supplied contexts stripped.

modelException

public static java.util.function.Supplier<ModelException> modelException(String message)

Creates a Supplier of ModelException objects that be passed to Optional.orElseThrow(Supplier) to generate exceptions as necessary.

Parameters:

message - The message to be used for the exception

Returns:

A Supplier that will create ModelException objects with the given message.

synchronizedModel

public static Model synchronizedModel(Model toSynchronize)

Make a model thread-safe by synchronizing all its methods. Iterators will still not be thread-safe!

Parameters:

toSynchronize - the model that should be synchronized

Returns:

Synchronized Model