Package org.eclipse.rdf4j.model.impl

Class DynamicModel

java.lang.Object

java.util.AbstractCollection<Statement>

java.util.AbstractSet<Statement>

org.eclipse.rdf4j.model.impl.DynamicModel

All Implemented Interfaces:

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

public class DynamicModel
extends AbstractSet<Statement>
implements Model

A LinkedHashModel or a TreeModel achieves fast data access at the cost of higher indexing time. The DynamicModel postpones this cost until such access is actually needed. It stores all data in a LinkedHashMap and supports adding, retrieving and removing data. The model will upgrade to a full model (provided by the modelFactory) if more complex operations are called, for instance removing data according to a pattern (eg. all statements with rdf:type as predicate).

DynamicModel is thread safe to the extent that the underlying LinkedHashMap or Model is. The upgrade path is protected by the actual upgrade method being synchronized. The LinkedHashMap storage is not removed once upgraded, so concurrent reads that have started reading from the LinkedHashMap can continue to read even during an upgrade. We do make the LinkedHashMap unmodifiable to reduce the chance of there being a bug.

Author:

Håvard Mikkelsen Ottestad

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
DynamicModel(ModelFactory modelFactory)

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	add(Statement statement)
boolean	addAll(Collection<? extends Statement> c)
void	clear()
boolean	clear(Resource... context)	Removes statements with the specified context exist in this model.
boolean	contains(Object o)
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.
boolean	containsAll(Collection<?> c)
Set<Resource>	contexts()	Returns a Set view of the contexts contained in this model.
boolean	equals(Object o)
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.
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.
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.
int	hashCode()
boolean	isEmpty()
Iterator<Statement>	iterator()
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(Object o)
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.
boolean	removeAll(Collection<?> c)
Optional<Namespace>	removeNamespace(String prefix)	Removes a namespace declaration by removing the association between a prefix and a namespace name.
boolean	retainAll(Collection<?> c)
Namespace	setNamespace(String prefix, String name)	Sets the prefix for a namespace.
void	setNamespace(Namespace namespace)	Sets the prefix for a namespace.
int	size()
Set<Resource>	subjects()	Returns a Set view of the subjects contained in this model.
Object[]	toArray()
<T> T[]	toArray(T[] a)
Model	unmodifiable()	Returns an unmodifiable view of this model.

Methods inherited from class java.util.AbstractCollection

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

spliterator

Constructor Details

DynamicModel

public DynamicModel(ModelFactory modelFactory)

Method Details

unmodifiable

public Model unmodifiable()

Description copied from interface: Model

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.

Specified by:

unmodifiable in interface Model

Returns:

an unmodifiable view of the specified set.

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.

Specified by:

getNamespace in interface NamespaceAware

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.

Specified by:

getNamespaces in interface NamespaceAware

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.

Specified by:

setNamespace in interface Model

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.

Specified by:

setNamespace in interface Model

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.

Specified by:

removeNamespace in interface Model

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

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

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 .

Specified by:

contains in interface Model

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

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

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.

Specified by:

add in interface Model

Parameters:

subj - The statement's subject.

pred - The statement's predicate.

obj - The statement's object.

contexts - The contexts to add statements to.

clear

public boolean clear(Resource... context)

Description copied from interface: Model

Removes statements with the specified context exist in this model.

Specified by:

clear in interface Model

Parameters:

context - The context of the statements to remove.

Returns:

true if one or more statements have been removed.

remove

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

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.

Specified by:

remove in interface Model

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.

filter

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

Description copied from interface: Model

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.

Specified by:

filter in interface Model

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:

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

subjects

public Set<Resource> subjects()

Description copied from interface: Model

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.

Specified by:

subjects in interface Model

Returns:

a set view of the subjects contained in this model

predicates

public Set<IRI> predicates()

Description copied from interface: Model

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.

Specified by:

predicates in interface Model

Returns:

a set view of the predicates contained in this model

objects

public Set<Value> objects()

Description copied from interface: Model

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.

Specified by:

objects in interface Model

Returns:

a set view of the objects contained in this model

contexts

public Set<Resource> contexts()

Description copied from interface: Model

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.

Specified by:

contexts in interface Model

Returns:

a set view of the contexts contained in this model

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>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<Statement>

Specified by:

isEmpty in interface Set<Statement>

Overrides:

isEmpty in class AbstractCollection<Statement>

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection<Statement>

Specified by:

contains in interface Set<Statement>

Overrides:

contains in class AbstractCollection<Statement>

iterator

public Iterator<Statement> iterator()

Specified by:

iterator in interface Collection<Statement>

Specified by:

iterator in interface Iterable<Statement>

Specified by:

iterator in interface Set<Statement>

Specified by:

iterator in class AbstractCollection<Statement>

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<Statement>

Specified by:

toArray in interface Set<Statement>

Overrides:

toArray in class AbstractCollection<Statement>

toArray

public <T> T[] toArray(T[] a)

Specified by:

toArray in interface Collection<Statement>

Specified by:

toArray in interface Set<Statement>

Overrides:

toArray in class AbstractCollection<Statement>

add

public boolean add(Statement statement)

Specified by:

add in interface Collection<Statement>

Specified by:

add in interface Set<Statement>

Overrides:

add in class AbstractCollection<Statement>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<Statement>

Specified by:

remove in interface Set<Statement>

Overrides:

remove in class AbstractCollection<Statement>

containsAll

public boolean containsAll(Collection<?> c)

Specified by:

containsAll in interface Collection<Statement>

Specified by:

containsAll in interface Set<Statement>

Overrides:

containsAll in class AbstractCollection<Statement>

addAll

public boolean addAll(Collection<? extends Statement> c)

Specified by:

addAll in interface Collection<Statement>

Specified by:

addAll in interface Set<Statement>

Overrides:

addAll in class AbstractCollection<Statement>

retainAll

public boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<Statement>

Specified by:

retainAll in interface Set<Statement>

Overrides:

retainAll in class AbstractCollection<Statement>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<Statement>

Specified by:

removeAll in interface Set<Statement>

Overrides:

removeAll in class AbstractSet<Statement>

clear

public void clear()

Specified by:

clear in interface Collection<Statement>

Specified by:

clear in interface Set<Statement>

Overrides:

clear in class AbstractCollection<Statement>

getStatements

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

Description copied from interface: Model

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

Specified by:

getStatements in interface Model

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.

See Also:

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

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<Statement>

Specified by:

equals in interface Set<Statement>

Overrides:

equals in class AbstractSet<Statement>

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<Statement>

Specified by:

hashCode in interface Set<Statement>

Overrides:

hashCode in class AbstractSet<Statement>