Package be.ugent.rml.store

Class QuadStore

java.lang.Object

be.ugent.rml.store.QuadStore

Direct Known Subclasses:

RDF4JStore, SimpleQuadStore

public abstract class QuadStore
extends Object

Vendor-neutral interface for managing RDF collections. Implemented for RDF4J and custom SimpleQuadStore (for faster implementation without indexing of RDF libraries)

Constructor Summary

Constructors

Constructor	Description
QuadStore()

Method Summary

Modifier and Type	Method	Description
void	addQuad(Quad q)	Helper function
void	addQuad(Term subject, Term predicate, Term object)	Helper function
abstract void	addQuad(Term subject, Term predicate, Term object, Term graph)	Add given Quad to store
void	addQuads(List<Quad> quads)	Add all quads in given list
boolean	contains(Term subject, Term predicate, Term object)	Helper function
abstract boolean	contains(Term subject, Term predicate, Term object, Term graph)	True if Quad matching input is present in store.
abstract void	copyNameSpaces(QuadStore store)	Copy namespaces between stores.
abstract boolean	equals(Object o)
Quad	getQuad(Term subject, Term predicate, Term object)	Helper function
Quad	getQuad(Term subject, Term predicate, Term object, Term graph)	Helper function
List<Quad>	getQuads(Term subject, Term predicate, Term object)	Helper function
abstract List<Quad>	getQuads(Term subject, Term predicate, Term object, Term graph)	Get all Quads in store matching arguments.
abstract boolean	isEmpty()	True if RDF quads present is 0
abstract boolean	isIsomorphic(QuadStore store)	Test if given store and this store are isomorphic RDF graph representations
abstract boolean	isSubset(QuadStore store)	Test if given store is subset of this store
abstract void	read(InputStream is, String base, org.eclipse.rdf4j.rio.RDFFormat format)	Read RDF to QuadStore TODO use class or enum for input format
abstract void	removeDuplicates()	Remove duplicate quads
void	removeQuads(Quad quad)
void	removeQuads(Term subject, Term predicate, Term object)	Helper function
abstract void	removeQuads(Term subject, Term predicate, Term object, Term graph)	Remove all Quads matching input from store.
void	removeQuads(List<Quad> quads)
void	renameAll(Term fromPredicate, Term toPredicate)	Rename all predicates in graph
abstract int	size()	Number of RDF quads
String	toSortedString()	Use sorted Quads in string representation
String	toString()	Uses Quads in string representation
void	tryPropertyTranslation(Term from, Term fromPredicate, Term to, Term toPredicate)	If fromPredicate is present on from, rename it to toPredicate and move it to to
void	write(ByteArrayOutputStream out, String format)	Helper function
void	write(PrintStream out, String format)	Helper function
abstract void	write(Writer out, String format)	Write out the QuadStore in given format TODO use class or enum for output format

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QuadStore

public QuadStore()

Method Detail

equals

public abstract boolean equals(Object o)

Overrides:

equals in class Object

removeQuads

public abstract void removeQuads(Term subject,
                                 Term predicate,
                                 Term object,
                                 Term graph)

Remove all Quads matching input from store.

Parameters:

subject -

predicate -

object -

graph -

contains

public abstract boolean contains(Term subject,
                                 Term predicate,
                                 Term object,
                                 Term graph)

True if Quad matching input is present in store.

Parameters:

subject -

predicate -

object -

graph -

Returns:

isIsomorphic

public abstract boolean isIsomorphic(QuadStore store)

Test if given store and this store are isomorphic RDF graph representations

Parameters:

store -

Returns:

isSubset

public abstract boolean isSubset(QuadStore store)

Test if given store is subset of this store

Parameters:

store -

Returns:

removeDuplicates

public abstract void removeDuplicates()

Remove duplicate quads

addQuad

public abstract void addQuad(Term subject,
                             Term predicate,
                             Term object,
                             Term graph)

Add given Quad to store

Parameters:

subject -

predicate -

object -

graph -

getQuads

public abstract List<Quad> getQuads(Term subject,
                                    Term predicate,
                                    Term object,
                                    Term graph)

Get all Quads in store matching arguments. Null can be used as a wildcard.

Parameters:

subject -

predicate -

object -

graph -

Returns:

copyNameSpaces

public abstract void copyNameSpaces(QuadStore store)

Copy namespaces between stores. Used in retaining the prefixes in the mapping file in the output. TODO define general Namespace class to use between QuadStore instances

Parameters:

store - QuadStore with namespaces to be copied to this store

isEmpty

public abstract boolean isEmpty()

True if RDF quads present is 0

Returns:

boolean

size

public abstract int size()

Number of RDF quads

Returns:

int

read

public abstract void read(InputStream is,
                          String base,
                          org.eclipse.rdf4j.rio.RDFFormat format)
                   throws Exception

Read RDF to QuadStore TODO use class or enum for input format

Parameters:

is - Stream of RDF in given format

base - Base URL

format - Given format for RDF

Throws:

Exception

write

public abstract void write(Writer out,
                           String format)
                    throws Exception

Write out the QuadStore in given format TODO use class or enum for output format

Parameters:

out - Writer output location

format - QuadStore format (.TTL)

Throws:

Exception

write

public final void write(ByteArrayOutputStream out,
                        String format)
                 throws Exception

Helper function

Parameters:

out -

format -

Throws:

Exception

write

public final void write(PrintStream out,
                        String format)
                 throws Exception

Helper function

Parameters:

out -

format -

Throws:

Exception

getQuad

public final Quad getQuad(Term subject,
                          Term predicate,
                          Term object,
                          Term graph)
                   throws Exception

Helper function

Parameters:

subject -

predicate -

object -

graph -

Returns:

Throws:

Exception

getQuad

public final Quad getQuad(Term subject,
                          Term predicate,
                          Term object)
                   throws Exception

Helper function

Parameters:

subject -

predicate -

object -

Returns:

Throws:

Exception

getQuads

public final List<Quad> getQuads(Term subject,
                                 Term predicate,
                                 Term object)

Helper function

Parameters:

subject -

predicate -

object -

Returns:

contains

public final boolean contains(Term subject,
                              Term predicate,
                              Term object)

Helper function

Parameters:

subject -

predicate -

object -

Returns:

addQuad

public final void addQuad(Term subject,
                          Term predicate,
                          Term object)

Helper function

Parameters:

subject -

predicate -

object -

addQuad

public final void addQuad(Quad q)

Helper function

Parameters:

q -

addQuads

public final void addQuads(List<Quad> quads)

Add all quads in given list

Parameters:

quads - to be added to QuadStore

removeQuads

public final void removeQuads(Term subject,
                              Term predicate,
                              Term object)

Helper function

Parameters:

subject -

predicate -

object -

removeQuads

public final void removeQuads(Quad quad)

removeQuads

public final void removeQuads(List<Quad> quads)

tryPropertyTranslation

public final void tryPropertyTranslation(Term from,
                                         Term fromPredicate,
                                         Term to,
                                         Term toPredicate)

If fromPredicate is present on from, rename it to toPredicate and move it to to

Parameters:

from -

fromPredicate -

to -

toPredicate -

renameAll

public final void renameAll(Term fromPredicate,
                            Term toPredicate)

Rename all predicates in graph

Parameters:

fromPredicate - predicate to be renamed

toPredicate - new predicate name

toString

public final String toString()

Uses Quads in string representation

Overrides:

toString in class Object

Returns:

String of QuadStore

toSortedString

public final String toSortedString()

Use sorted Quads in string representation

Returns:

sorted String of QuadStore