Class RDFDataset

java.lang.Object

java.util.AbstractMap<String,Object>

java.util.HashMap<String,Object>

java.util.LinkedHashMap<String,Object>

com.github.jsonldjava.core.RDFDataset

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Object>, SequencedMap<String,Object>

public class RDFDataset
extends LinkedHashMap<String,Object>

Starting to migrate away from using plain java Maps as the internal RDF dataset store. Currently each item just wraps a Map based on the old format so everything doesn't break. Will phase this out once everything is using the new format.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RDFDataset.BlankNode
static class	RDFDataset.IRI
static class	RDFDataset.Literal
static class	RDFDataset.Node
static class	RDFDataset.Quad

Nested classes/interfaces inherited from class AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
private JsonLdApi	api
private final Map<String,String>	context
private static final RDFDataset.Node	first
private static final RDFDataset.Node	nil
private static final Pattern	PATTERN_DOUBLE
private static final Pattern	PATTERN_INTEGER
private static final RDFDataset.Node	rest
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
RDFDataset()
RDFDataset(JsonLdApi jsonLdApi)

Method Summary

Modifier and Type	Method	Description
void	addQuad(String subject, String predicate, String object, String graph)	Adds a triple to the specified graph of this dataset
void	addQuad(String s, String p, String value, String datatype, String language, String graph)	Adds a triple to the specified graph of this dataset
void	addTriple(String subject, String predicate, String object)	Adds a triple to the default graph of this dataset
void	addTriple(String subject, String predicate, String value, String datatype, String language)	Adds a triple to the @default graph of this dataset
void	clearNamespaces()	clears all the namespaces in this dataset
Map<String,Object>	getContext()	Returns a valid context containing any namespaces set
String	getNamespace(String ns)
Map<String,String>	getNamespaces()
List<RDFDataset.Quad>	getQuads(String graphName)
Set<String>	graphNames()
(package private) void	graphToRDF(String graphName, Map<String,Object> graph)	Creates an array of RDF triples for the given graph.
private RDFDataset.Node	objectToRDF(Object item)	Converts a JSON-LD value object to an RDF literal or a JSON-LD string or node object to an RDF resource.
void	parseContext(Object contextLike)	parses a context object and sets any namespaces found within it
void	setNamespace(String ns, String prefix)

Methods inherited from class LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, newLinkedHashMap, putFirst, putLast, removeEldestEntry, replaceAll, reversed, sequencedEntrySet, sequencedKeySet, sequencedValues, values

Methods inherited from class HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, newHashMap, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class AbstractMap

equals, hashCode, toString

Methods inherited from class Object

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

Methods inherited from interface Map

compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from interface SequencedMap

firstEntry, lastEntry, pollFirstEntry, pollLastEntry

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

PATTERN_INTEGER

private static final Pattern PATTERN_INTEGER

PATTERN_DOUBLE

private static final Pattern PATTERN_DOUBLE

first

private static final RDFDataset.Node first

rest

private static final RDFDataset.Node rest

nil

private static final RDFDataset.Node nil

context

private final Map<String,String> context

api

private JsonLdApi api

Constructor Details

RDFDataset

public RDFDataset()

RDFDataset

public RDFDataset(JsonLdApi jsonLdApi)

Method Details

setNamespace

public void setNamespace(String ns,
 String prefix)

getNamespace

public String getNamespace(String ns)

clearNamespaces

public void clearNamespaces()

clears all the namespaces in this dataset

getNamespaces

public Map<String,String> getNamespaces()

getContext

public Map<String,Object> getContext()

Returns a valid context containing any namespaces set

Returns:

The context map

parseContext

public void parseContext(Object contextLike)
                  throws JsonLdError

parses a context object and sets any namespaces found within it

Parameters:

contextLike - The context to parse

Throws:

JsonLdError - If the context can't be parsed

addTriple

public void addTriple(String subject,
 String predicate,
 String value,
 String datatype,
 String language)

Adds a triple to the @default graph of this dataset

Parameters:

subject - the subject for the triple

predicate - the predicate for the triple

value - the value of the literal object for the triple

datatype - the datatype of the literal object for the triple (null values will default to xsd:string)

language - the language of the literal object for the triple (or null)

addQuad

public void addQuad(String s,
 String p,
 String value,
 String datatype,
 String language,
 String graph)

Adds a triple to the specified graph of this dataset

Parameters:

s - the subject for the triple

p - the predicate for the triple

value - the value of the literal object for the triple

datatype - the datatype of the literal object for the triple (null values will default to xsd:string)

language - the language of the literal object for the triple (or null)

graph - the graph to add this triple to

addTriple

public void addTriple(String subject,
 String predicate,
 String object)

Adds a triple to the default graph of this dataset

Parameters:

subject - the subject for the triple

predicate - the predicate for the triple

object - the object for the triple

addQuad

public void addQuad(String subject,
 String predicate,
 String object,
 String graph)

Adds a triple to the specified graph of this dataset

Parameters:

subject - the subject for the triple

predicate - the predicate for the triple

object - the object for the triple

graph - the graph to add this triple to

graphToRDF

void graphToRDF(String graphName,
 Map<String,Object> graph)

Creates an array of RDF triples for the given graph.

Parameters:

graphName - The graph URI

graph - the graph to create RDF triples for.

objectToRDF

private RDFDataset.Node objectToRDF(Object item)

Converts a JSON-LD value object to an RDF literal or a JSON-LD string or node object to an RDF resource.

Parameters:

item - the JSON-LD value or node object.

Returns:

the RDF literal or RDF resource.

graphNames

public Set<String> graphNames()

getQuads

public List<RDFDataset.Quad> getQuads(String graphName)