Package org.eclipse.rdf4j.model.impl

Class TreeModel

java.lang.Object

java.util.AbstractCollection<Statement>

java.util.AbstractSet<Statement>

org.eclipse.rdf4j.model.impl.AbstractModel

org.eclipse.rdf4j.model.impl.TreeModel

All Implemented Interfaces:

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

public class TreeModel
extends AbstractModel
implements SortedSet<Statement>

A Red-Black tree based Model implementation. The model is sorted according to the lexical ordering of terms.

This implementation provides guaranteed log(n) time cost for filtered access by any number of terms. If an index is not yet available for a set of positions, it is created at runtime using a TreeSet.

Note that this implementation is not synchronized. If multiple threads access a model concurrently, even if all of them are read operations, it must be synchronized externally. This is typically accomplished by synchronizing on some object that naturally encapsulates the model. If no such object exists, the set should be "wrapped" using the Models.synchronizedModel method.

Author:

James Leigh

See Also:

• Serialized Form

Field Summary

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

NULL_CONTEXT

Constructor Summary

Constructors

Constructor	Description
TreeModel()
TreeModel(Collection<? extends Statement> c)
TreeModel(Set<Namespace> namespaces)
TreeModel(Set<Namespace> namespaces, Collection<? extends Statement> c)
TreeModel(Model model)

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.
Statement	ceiling(Statement e)
void	clear()
Comparator<? super Statement>	comparator()
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.
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.
Statement	first()
Statement	floor(Statement e)
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.
SortedSet<Statement>	headSet(Statement toElement)
Statement	higher(Statement e)
boolean	isEmpty()
Iterator<Statement>	iterator()
Statement	last()
Statement	lower(Statement e)
Statement	pollFirst()
Statement	pollLast()
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.
void	removeTermIteration(Iterator<Statement> iterator, Resource subj, IRI pred, Value obj, Resource... contexts)	Called by aggregate sets when a term has been removed from a term iterator.
Namespace	setNamespace(String prefix, String name)	Sets the prefix for a namespace.
void	setNamespace(Namespace namespace)	Sets the prefix for a namespace.
int	size()
SortedSet<Statement>	subSet(Statement fromElement, Statement toElement)
SortedSet<Statement>	tailSet(Statement fromElement)

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

add, addAll, clear, closeIterator, contains, containsAll, contexts, objects, predicates, remove, removeAll, retainAll, subjects, toArray, toArray, unmodifiable

Methods inherited from class java.util.AbstractSet

equals, hashCode

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 org.eclipse.rdf4j.model.Model

getStatements

Methods inherited from interface java.util.Set

add, addAll, contains, containsAll, equals, hashCode, remove, removeAll, retainAll, toArray, toArray

Methods inherited from interface java.util.SortedSet

spliterator

Constructor Details

TreeModel

public TreeModel()

TreeModel

public TreeModel(Model model)

TreeModel

public TreeModel(Collection<? extends Statement> c)

TreeModel

public TreeModel(Set<Namespace> namespaces,
 Collection<? extends Statement> c)

TreeModel

public TreeModel(Set<Namespace> namespaces)

Method Details

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()

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>

clear

public void clear()

Specified by:

clear in interface Collection<Statement>

Specified by:

clear in interface Set<Statement>

Overrides:

clear in class AbstractModel

comparator

public Comparator<? super Statement> comparator()

Specified by:

comparator in interface SortedSet<Statement>

first

public Statement first()

Specified by:

first in interface SortedSet<Statement>

last

public Statement last()

Specified by:

last in interface SortedSet<Statement>

lower

public Statement lower(Statement e)

floor

public Statement floor(Statement e)

ceiling

public Statement ceiling(Statement e)

higher

public Statement higher(Statement e)

pollFirst

public Statement pollFirst()

pollLast

public Statement pollLast()

subSet

public SortedSet<Statement> subSet(Statement fromElement,
 Statement toElement)

Specified by:

subSet in interface SortedSet<Statement>

headSet

public SortedSet<Statement> headSet(Statement toElement)

Specified by:

headSet in interface SortedSet<Statement>

tailSet

public SortedSet<Statement> tailSet(Statement fromElement)

Specified by:

tailSet in interface SortedSet<Statement>

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.

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.

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.

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>

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...)

removeTermIteration

public void removeTermIteration(Iterator<Statement> iterator,
 Resource subj,
 IRI pred,
 Value obj,
 Resource... contexts)

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:

iterator - 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

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<Statement>

Specified by:

isEmpty in interface Set<Statement>

Overrides:

isEmpty in class AbstractModel