Package org.eclipse.rdf4j.model

Interface Model

All Superinterfaces:

Collection<Statement>, Iterable<Statement>, NamespaceAware, Serializable, Set<Statement>

All Known Implementing Classes:

AbstractMemoryOverflowModel, AbstractModel, DynamicModel, EmptyModel, FilteredModel, LinkedHashModel, SailModel, TreeModel

public interface Model
extends Set<Statement>, Serializable, NamespaceAware

An RDF Model, represented as a Set of Statements with predictable iteration order.

Additional utility functionality for working with Model objects is available in the org.eclipse.rdf4j.model.util.Models utility class.

Author:

James Leigh, Jeen Broekstra

Method Summary

Modifier and Type	Method	Description
boolean	add(Resource subj, IRI pred, Value obj, Resource... contexts)	Adds one or more statements to the model.
boolean	clear(Resource... context)	Removes statements with the specified context exist in this model.
boolean	contains(Resource subj, IRI pred, Value obj, Resource... contexts)	Determines if statements with the specified subject, predicate, object and (optionally) context exist in this model.
default Set<Resource>	contexts()	Returns a Set view of the contexts contained in this model.
Model	filter(Resource subj, IRI pred, Value obj, Resource... contexts)	Returns a filtered view of the statements with the specified subject, predicate, object and (optionally) context.
default Iterable<Statement>	getStatements(Resource subject, IRI predicate, Value object, Resource... contexts)	Returns an Iterable over all Statements in this Model that match the supplied criteria.
Set<Value>	objects()	Returns a Set view of the objects contained in this model.
Set<IRI>	predicates()	Returns a Set view of the predicates contained in this model.
boolean	remove(Resource subj, IRI pred, Value obj, Resource... contexts)	Removes statements with the specified subject, predicate, object and (optionally) context exist in this model.
Optional<Namespace>	removeNamespace(String prefix)	Removes a namespace declaration by removing the association between a prefix and a namespace name.
default Namespace	setNamespace(String prefix, String name)	Sets the prefix for a namespace.
void	setNamespace(Namespace namespace)	Sets the prefix for a namespace.
Set<Resource>	subjects()	Returns a Set view of the subjects contained in this model.
Model	unmodifiable()	Returns an unmodifiable view of this model.

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface org.eclipse.rdf4j.model.NamespaceAware

getNamespace, getNamespaces

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, spliterator, toArray, toArray

Method Details

unmodifiable

Model unmodifiable()

Returns an unmodifiable view of this model. This method provides "read-only" access to this model. Query operations on the returned model "read through" to this model, and attempts to modify the returned model, whether direct or via its iterator, result in an UnsupportedOperationException.

Returns:

an unmodifiable view of the specified set.

setNamespace

default Namespace setNamespace(String prefix,
 String name)

Sets the prefix for a namespace. This will replace any existing namespace associated to the prefix.

Parameters:

prefix - The new prefix.

name - The namespace name that the prefix maps to.

Returns:

The Namespace object for the given namespace.

setNamespace

void setNamespace(Namespace namespace)

Sets the prefix for a namespace. This will replace any existing namespace associated to the prefix.

Parameters:

namespace - A Namespace object to use in this Model.

removeNamespace

Optional<Namespace> removeNamespace(String prefix)

Removes a namespace declaration by removing the association between a prefix and a namespace name.

Parameters:

prefix - The namespace prefix of which the assocation with a namespace name is to be removed.

Returns:

the previous namespace bound to the prefix or Optional.empty()

contains

boolean contains(Resource subj,
 IRI pred,
 Value obj,
 Resource... contexts)

Determines if statements with the specified subject, predicate, object and (optionally) context exist in this model. The subject, predicate and object parameters can be null to indicate wildcards. The contexts parameter is a wildcard and accepts zero or more values. If no contexts are specified, statements will match disregarding their context. If one or more contexts are specified, statements with a context matching one of these will match. Note: to match statements without an associated context, specify the value null and explicitly cast it to type Resource.

Examples: model.contains(s1, null, null) is true if any statements in this model have subject s1,
model.contains(null, null, null, c1) is true if any statements in this model have context c1,
model.contains(null, null, null, (Resource)null) is true if any statements in this model have no associated context,
model.contains(null, null, null, c1, c2, c3) is true if any statements in this model have context c1, c2 or c3 .

Parameters:

subj - The subject of the statements to match, null to match statements with any subject.

pred - The predicate of the statements to match, null to match statements with any predicate.

obj - The object of the statements to match, null to match statements with any object.

contexts - The contexts of the statements to match. If no contexts are specified, statements will match disregarding their context. If one or more contexts are specified, statements with a context matching one of these will match.

Returns:

true if statements match the specified pattern.

add

boolean add(Resource subj,
 IRI pred,
 Value obj,
 Resource... contexts)

Adds one or more statements to the model. This method creates a statement for each specified context and adds those to the model. If no contexts are specified, a single statement with no associated context is added. If this Model is a filtered Model then null (if context empty) values are permitted and will use the corresponding filtered values.

Parameters:

subj - The statement's subject.

pred - The statement's predicate.

obj - The statement's object.

contexts - The contexts to add statements to.

Throws:

IllegalArgumentException - If This Model cannot store the given statement, because it is filtered out of this view.

UnsupportedOperationException - If this Model cannot accept any statements, because it is filtered to the empty set.

clear

boolean clear(Resource... context)

Removes statements with the specified context exist in this model.

Parameters:

context - The context of the statements to remove.

Returns:

true if one or more statements have been removed.

remove

boolean remove(Resource subj,
 IRI pred,
 Value obj,
 Resource... contexts)

Removes statements with the specified subject, predicate, object and (optionally) context exist in this model. The subject, predicate and object parameters can be null to indicate wildcards. The contexts parameter is a wildcard and accepts zero or more values. If no contexts are specified, statements will be removed disregarding their context. If one or more contexts are specified, statements with a context matching one of these will be removed. Note: to remove statements without an associated context, specify the value null and explicitly cast it to type Resource.

Examples: model.remove(s1, null, null) removes any statements in this model have subject s1,
model.remove(null, null, null, c1) removes any statements in this model have context c1 ,
model.remove(null, null, null, (Resource)null) removes any statements in this model have no associated context,
model.remove(null, null, null, c1, c2, c3) removes any statements in this model have context c1, c2 or c3.

Parameters:

subj - The subject of the statements to remove, null to remove statements with any subject.

pred - The predicate of the statements to remove, null to remove statements with any predicate.

obj - The object of the statements to remove, null to remove statements with any object.

contexts - The contexts of the statements to remove. If no contexts are specified, statements will be removed disregarding their context. If one or more contexts are specified, statements with a context matching one of these will be removed.

Returns:

true if one or more statements have been removed.

getStatements

default Iterable<Statement> getStatements(Resource subject,
 IRI predicate,
 Value object,
 Resource... contexts)

Returns an Iterable over all Statements in this Model that match the supplied criteria.

Examples:

• model.getStatements(s1, null, null) matches all statements that have subject s1
• model.getStatements(s1, p1, null) matches all statements that have subject s1 and predicate p1
• model.getStatements(null, null, null, c1) matches all statements that have context c1
• model.getStatements(null, null, null, (Resource)null) matches all statements that have no associated context
• model.getStatements(null, null, null, c1, c2, c3) matches all statements that have context c1, c2 or c3

Parameters:

subject - The subject of the statements to match, null to match statements with any subject.

predicate - The predicate of the statements to match, null to match statements with any predicate.

object - The object of the statements to match, null to match statements with any object.

contexts - The contexts of the statements to match. If no contexts are specified, statements will match disregarding their context. If one or more contexts are specified, statements with a context matching any one of these will match. To match statements without an associated context, specify the value null and explicitly cast it to type Resource.

Returns:

an Iterable over the statements in this Model that match the specified pattern.

Since:

3.2.0

See Also:

• filter(Resource, IRI, Value, Resource...)

filter

Model filter(Resource subj,
 IRI pred,
 Value obj,
 Resource... contexts)

Returns a filtered view of the statements with the specified subject, predicate, object and (optionally) context. The subject, predicate and object parameters can be null to indicate wildcards. The contexts parameter is a wildcard and accepts zero or more values. If no contexts are specified, statements will match disregarding their context. If one or more contexts are specified, statements with a context matching one of these will match. Note: to match statements without an associated context, specify the value null and explicitly cast it to type Resource.

The returned model is backed by this Model, so changes to this Model are reflected in the returned model, and vice-versa. If this Model is modified while an iteration over the returned model is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The model supports element removal, which removes the corresponding statement from this Model, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. The statements passed to the add and addAll operations must match the parameter pattern.

Examples: model.filter(s1, null, null) matches all statements that have subject s1,
model.filter(null, null, null, c1) matches all statements that have context c1,
model.filter(null, null, null, (Resource)null) matches all statements that have no associated context,
model.filter(null, null, null, c1, c2, c3) matches all statements that have context c1, c2 or c3.

Parameters:

subj - The subject of the statements to match, null to match statements with any subject.

pred - The predicate of the statements to match, null to match statements with any predicate.

obj - The object of the statements to match, null to match statements with any object.

contexts - The contexts of the statements to match. If no contexts are specified, statements will match disregarding their context. If one or more contexts are specified, statements with a context matching one of these will match.

Returns:

The statements that match the specified pattern.

See Also:

• getStatements(Resource, IRI, Value, Resource...)

subjects

Set<Resource> subjects()

Returns a Set view of the subjects contained in this model. The set is backed by the model, so changes to the model are reflected in the set, and vice-versa. If the model is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes all statements from the model for which that element is a subject value, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations if the parameters pred or obj are null.

Returns:

a set view of the subjects contained in this model

predicates

Set<IRI> predicates()

Returns a Set view of the predicates contained in this model. The set is backed by the model, so changes to the model are reflected in the set, and vice-versa. If the model is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes all statements from the model for which that element is a predicate value, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations if the parameters subj or obj are null.

Returns:

a set view of the predicates contained in this model

objects

Set<Value> objects()

Returns a Set view of the objects contained in this model. The set is backed by the model, so changes to the model are reflected in the set, and vice-versa. If the model is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes all statements from the model for which that element is an object value, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations if the parameters subj or pred are null.

Returns:

a set view of the objects contained in this model

contexts

default Set<Resource> contexts()

Returns a Set view of the contexts contained in this model. The set is backed by the model, so changes to the model are reflected in the set, and vice-versa. If the model is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes all statements from the model for which that element is a context value, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations if the parameters subj , pred or obj are null.

Returns:

a set view of the contexts contained in this model