org.eclipse.rdf4j.model.impl

Class FilteredModel

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<Statement>

org.eclipse.rdf4j.model.impl.AbstractModel

org.eclipse.rdf4j.model.impl.FilteredModel

All Implemented Interfaces:

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

public abstract class FilteredModel
extends AbstractModel

Applies a basic graph pattern filter to what triples can be see.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Resource[]	contexts
protected Value	obj
protected IRI	pred
protected Resource	subj

Constructor Summary

Constructors

Constructor and Description
FilteredModel(AbstractModel model, Resource subj, IRI pred, Value obj, Resource... contexts)

Method Summary

Modifier and Type	Method and Description
boolean	add(Resource s, IRI p, Value o, Resource... c) Adds one or more statements to the model.
boolean	contains(Resource s, IRI p, Value o, Resource... c) Determines if statements with the specified subject, predicate, object and (optionally) context exist in this model.
Model	filter(Resource s, IRI p, Value o, Resource... c) Returns a view of the statements with the specified subject, predicate, object and (optionally) context.
Optional<Namespace>	getNamespace(String prefix) Gets the namespace that is associated with the specified prefix, if any.
Set<Namespace>	getNamespaces() Gets the set that contains the assigned namespaces.
boolean	remove(Resource s, IRI p, Value o, Resource... c) Removes statements with the specified subject, predicate, object and (optionally) context exist in this model.
protected abstract void	removeFilteredTermIteration(Iterator<Statement> iter, Resource subj, IRI pred, Value obj, Resource... contexts) Called by aggregate sets when a term has been removed from a term iterator.
Optional<Namespace>	removeNamespace(String prefix) Removes a namespace declaration by removing the association between a prefix and a namespace name.
void	removeTermIteration(Iterator<Statement> iter, Resource s, IRI p, Value o, Resource... c) Called by aggregate sets when a term has been removed from a term iterator.
void	setNamespace(Namespace namespace) Sets the prefix for a namespace.
Namespace	setNamespace(String prefix, String name) Sets the prefix for a namespace.
int	size()

Methods inherited from class org.eclipse.rdf4j.model.impl.AbstractModel

add, addAll, clear, clear, closeIterator, contains, containsAll, contexts, equals, getValueFactory, hashCode, isEmpty, match, objects, predicates, remove, removeAll, retainAll, subjects, toArray, toArray, unmodifiable

Methods inherited from class java.util.AbstractCollection

iterator, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

add, contains, filter, objectIRI, objectLiteral, objectResource, objectString, objectURI, objectValue, remove, subjectBNode, subjectIRI, subjectResource, subjectURI

Methods inherited from interface java.util.Set

iterator, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

subj

protected Resource subj

pred

protected IRI pred

obj

protected Value obj

contexts

protected Resource[] contexts

Constructor Detail

FilteredModel

public FilteredModel(AbstractModel model,
                     Resource subj,
                     IRI pred,
                     Value obj,
                     Resource... contexts)

Method Detail

getNamespace

public Optional<Namespace> getNamespace(String prefix)

Description copied from interface: NamespaceAware

Gets the namespace that is associated with the specified prefix, if any. If multiple namespaces match the given prefix, the result may not be consistent over successive calls to this method.

Parameters:

prefix - A namespace prefix.

Returns:

The namespace name that is associated with the specified prefix, or Optional.empty() if there is no such namespace.

getNamespaces

public Set<Namespace> getNamespaces()

Description copied from interface: NamespaceAware

Gets the set that contains the assigned namespaces.

Returns:

A Set containing the Namespace objects that are available.

setNamespace

public Namespace setNamespace(String prefix,
                              String name)

Description copied from interface: Model

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

public void setNamespace(Namespace namespace)

Description copied from interface: Model

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

public Optional<Namespace> removeNamespace(String prefix)

Description copied from interface: Model

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()

size

public int size()

Specified by:

size in interface Collection<Statement>

Specified by:

size in interface Set<Statement>

Specified by:

size in class AbstractCollection<Statement>

add

public boolean add(Resource s,
                   IRI p,
                   Value o,
                   Resource... c)

Description copied from interface: Model

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:

s - The statement's subject.

p - The statement's predicate.

o - The statement's object.

c - The contexts to add statements to.

remove

public boolean remove(Resource s,
                      IRI p,
                      Value o,
                      Resource... c)

Description copied from interface: Model

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:

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

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

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

c - 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.

contains

public boolean contains(Resource s,
                        IRI p,
                        Value o,
                        Resource... c)

Description copied from interface: Model

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:

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

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

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

c - 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.

filter

public Model filter(Resource s,
                    IRI p,
                    Value o,
                    Resource... c)

Description copied from interface: Model

Returns a 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:

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

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

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

c - 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.

removeTermIteration

public final void removeTermIteration(Iterator<Statement> iter,
                                      Resource s,
                                      IRI p,
                                      Value o,
                                      Resource... c)

Description copied from class: AbstractModel

Called by aggregate sets when a term has been removed from a term iterator. Exactly one of the last four terms will be non-empty.

Specified by:

removeTermIteration in class AbstractModel

Parameters:

iter - The iterator used to navigate the live set (never null)

s - the subject term to be removed or null

p - the predicate term to be removed or null

o - the object term to be removed or null

c - an array of one context term to be removed or an empty array

removeFilteredTermIteration

protected abstract void removeFilteredTermIteration(Iterator<Statement> iter,
                                                    Resource subj,
                                                    IRI pred,
                                                    Value obj,
                                                    Resource... contexts)

Called by aggregate sets when a term has been removed from a term iterator. At least one of the last four terms will be non-empty.

Parameters:

iter - The iterator used to navigate the live set (never null)

subj - the subject term to be removed or null

pred - the predicate term to be removed or null

obj - the object term to be removed or null

contexts - an array of one context term to be removed or an empty array