com.epimorphics.rdfutil

Class RDFNodeWrapper

java.lang.Object

com.epimorphics.rdfutil.RDFNodeWrapper

public class RDFNodeWrapper
extends Object

Provides a wrapper round an RDFNode from some model in some dataset. The wrapper provides uniform use of transaction/locking for safe access plus automatic prefix expansion to simplify use from scripting languages.

Author:

Dave Reynolds

Field Summary

Fields

Modifier and Type	Field and Description
protected ModelWrapper	modelw
protected org.apache.jena.rdf.model.RDFNode	node

Constructor Summary

Constructors

Constructor and Description
RDFNodeWrapper(ModelWrapper modelw, org.apache.jena.rdf.model.RDFNode node)

Method Summary

Modifier and Type	Method and Description
List<RDFNodeWrapper>	asList() Return the contents of the RDF list as a list of wrapped nodes
org.apache.jena.rdf.model.Literal	asLiteral() Return as a Jena Literal object
org.apache.jena.rdf.model.RDFNode	asRDFNode() Return unwrapped Jena RDFNode
org.apache.jena.rdf.model.Resource	asResource() Return as a Jena Resource object
String	asTurtle() Format a wrapped node as though it was being serialise as Turtle.
protected String	asTurtle(org.apache.jena.rdf.model.RDFNode val, org.apache.jena.shared.PrefixMapping prefixes)
ModelWrapper	closure() Return a wrapped memory model containing the bNode closure of this resource
ModelWrapper	closure(ModelWrapper target) Added the bNode closure of this resource into the given (wrapped) model
List<RDFNodeWrapper>	connectedNodes(String path) Return the list nodes which link to this one via a SPARQL property path
boolean	equals(Object other)
RDFNodeWrapper	firstValueOf(String props) Check each property in a comma-separated list of named properties and return the value of the first that has a value
RDFNodeWrapper	get(Object prop) Return a single value for the property of null if there is none, property can be specified using URI strings, curies or nodes
RDFNodeWrapper	getDatatype() If this is a literal return its datatype as a wrapped node, otherwise return null
String	getLanguage() If this is a literal return its language, otherwise return null
String	getLexicalForm() Return the lexical form for a literal, the URI of a resource, the anonID of a bNode
String	getLocalizedValue(Object prop) Return a string value for the given property, selecting one in the model's locale language if possible
ModelWrapper	getModelW()
String	getName()
RDFNodeWrapper	getPropertyValue(Object prop) Return a single value for the property of null if there is none, property can be specified using URI strings, curies or nodes
String	getShortURI() Return the shortform curi for the URI if possible, else the full URI
String	getURI() Return the URI
Object	getValue() If this is a literal return the literal value as a java object, otherwise returns self
int	hashCode()
boolean	hasResourceValue(Object prop, Object value) Return true if the property has the given value
boolean	isAnon() Return true if this is an anonymous resource
boolean	isList() Return true if the node is an RDF list
boolean	isLiteral() tests true of the node is a literal
boolean	isResource() Return true if this is an RDF resource
List<PropertyValue>	listInLinks() Return the set of nodes which point to us
List<RDFNodeWrapper>	listInLinks(Object prop) Return list of nodes that point to us by the given property
List<PropertyValue>	listProperties() Return the set of property values of this node as a ordered list of value bindings
List<RDFNodeWrapper>	listPropertyValues(Object prop) Return the value of the given property as a list of literal values or wrapped nodes, property can be specified using URI strings, curies or nodes
protected String	tokeniseWords(String name) Tokenise the input string into words based on camelCase boundaries and hyphen characters.
org.apache.jena.rdf.model.Property	toProperty(Object prop) Return the RDF property object identified by the given prop.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

node

protected org.apache.jena.rdf.model.RDFNode node

modelw

protected ModelWrapper modelw

Constructor Detail

RDFNodeWrapper

public RDFNodeWrapper(ModelWrapper modelw,
                      org.apache.jena.rdf.model.RDFNode node)

Method Detail

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

asTurtle

public String asTurtle()

Format a wrapped node as though it was being serialise as Turtle. Useful for embedding a node into, for example, a SPARQL query.

Returns:

The formatted node

asTurtle

protected String asTurtle(org.apache.jena.rdf.model.RDFNode val,
                          org.apache.jena.shared.PrefixMapping prefixes)

getModelW

public ModelWrapper getModelW()

asRDFNode

public org.apache.jena.rdf.model.RDFNode asRDFNode()

Return unwrapped Jena RDFNode

isLiteral

public boolean isLiteral()

tests true of the node is a literal

asLiteral

public org.apache.jena.rdf.model.Literal asLiteral()

Return as a Jena Literal object

isList

public boolean isList()

Return true if the node is an RDF list

asList

public List<RDFNodeWrapper> asList()

Return the contents of the RDF list as a list of wrapped nodes

getLexicalForm

public String getLexicalForm()

Return the lexical form for a literal, the URI of a resource, the anonID of a bNode

getName

public String getName()

Returns:

A name for the resource. By preference, this will be a label property of the resource. Otherwise, a curie or localname will be used if no naming property is found.

tokeniseWords

protected String tokeniseWords(String name)

Tokenise the input string into words based on camelCase boundaries and hyphen characters. If the input string is already tokenised into words (determined by whether it contains a space character or not), return the string unchanged.

Parameters:

name - The input name to tokenise

Returns:

The input string, with camel-case boundaries, hyphens and underscores replaced by spaces.

getLanguage

public String getLanguage()

If this is a literal return its language, otherwise return null

getValue

public Object getValue()

If this is a literal return the literal value as a java object, otherwise returns self

getDatatype

public RDFNodeWrapper getDatatype()

If this is a literal return its datatype as a wrapped node, otherwise return null

isResource

public boolean isResource()

Return true if this is an RDF resource

isAnon

public boolean isAnon()

Return true if this is an anonymous resource

asResource

public org.apache.jena.rdf.model.Resource asResource()

Return as a Jena Resource object

getURI

public String getURI()

Return the URI

getShortURI

public String getShortURI()

Return the shortform curi for the URI if possible, else the full URI

toProperty

public org.apache.jena.rdf.model.Property toProperty(Object prop)

Return the RDF property object identified by the given prop. Cases:

• prop is the URI of the property in full
• prop is the URI of the property in prefix:name form
• prop is an RDF Property object
• prop is an RDF Resource object
• prop is an RDFNodeWrapper, in which case the property denoted is that denoted by the wrapped RDF node

Parameters:

prop - An object identifying a property

Returns:

The RDF Property object, or null

get

public RDFNodeWrapper get(Object prop)

Return a single value for the property of null if there is none, property can be specified using URI strings, curies or nodes

getPropertyValue

public RDFNodeWrapper getPropertyValue(Object prop)

Return a single value for the property of null if there is none, property can be specified using URI strings, curies or nodes

getLocalizedValue

public String getLocalizedValue(Object prop)

Return a string value for the given property, selecting one in the model's locale language if possible

hasResourceValue

public boolean hasResourceValue(Object prop,
                                Object value)

Return true if the property has the given value

listPropertyValues

public List<RDFNodeWrapper> listPropertyValues(Object prop)

Return the value of the given property as a list of literal values or wrapped nodes, property can be specified using URI strings, curies or nodes

listProperties

public List<PropertyValue> listProperties()

Return the set of property values of this node as a ordered list of value bindings

listInLinks

public List<RDFNodeWrapper> listInLinks(Object prop)

Return list of nodes that point to us by the given property

listInLinks

public List<PropertyValue> listInLinks()

Return the set of nodes which point to us

firstValueOf

public RDFNodeWrapper firstValueOf(String props)

Check each property in a comma-separated list of named properties and return the value of the first that has a value

connectedNodes

public List<RDFNodeWrapper> connectedNodes(String path)

Return the list nodes which link to this one via a SPARQL property path

closure

public ModelWrapper closure()

Return a wrapped memory model containing the bNode closure of this resource

closure

public ModelWrapper closure(ModelWrapper target)

Added the bNode closure of this resource into the given (wrapped) model