org.topbraid.jenax.util

Class RDFLabels

java.lang.Object

org.topbraid.jenax.util.RDFLabels

public class RDFLabels
extends Object

A singleton that is used to render resources into strings. By default this displays qnames (if possible). Can be changed, for example, to switch to displaying rdfs:labels instead of qnames etc.

Author:

Holger Knublauch

Constructor Summary

Constructors

Constructor and Description
RDFLabels()

Method Summary

Modifier and Type	Method and Description
static void	appendTemplateCallLabel(StringBuffer buffer, String labelTemplate, Map<String,org.apache.jena.rdf.model.RDFNode> args) Renders a template call's label template into a label by inserting the evaluated SPARQL expressions into appropriate spaces marked with {expression}.
static RDFLabels	get() Gets the singleton instance of this class.
String	getBlankNodeLabel(org.apache.jena.rdf.model.Resource resource) Gets a "human-readable" label for a blank node, e.g.
String	getCustomizedLabel(org.apache.jena.rdf.model.Resource resource) Gets a "human-readable" label for a given Resource.
String	getLabel(org.apache.jena.rdf.model.Resource resource) Gets the label for a given Resource.
String	getNodeLabel(org.apache.jena.rdf.model.RDFNode node)
static void	set(RDFLabels value) Replaces the singleton to a subclass with different behavior.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RDFLabels

public RDFLabels()

Method Detail

get

public static RDFLabels get()

Gets the singleton instance of this class.

Returns:

the singleton

set

public static void set(RDFLabels value)

Replaces the singleton to a subclass with different behavior. This is used by TopBraid, which has its own rendering engine.

Parameters:

value - the new engine

getBlankNodeLabel

public String getBlankNodeLabel(org.apache.jena.rdf.model.Resource resource)

Gets a "human-readable" label for a blank node, e.g. Manchester Syntax for OWL restrictions. The default implementation doesn't do much yet it's overloaded in TopBraid.

Parameters:

resource - the blank node resource to get the label for

Returns:

a label for the bnode

getCustomizedLabel

public String getCustomizedLabel(org.apache.jena.rdf.model.Resource resource)

Gets a "human-readable" label for a given Resource. This checks for any existing rdfs:label, otherwise falls back to getLabel().

Parameters:

resource - the resource to get the label for

Returns:

the label (never null)

getLabel

public String getLabel(org.apache.jena.rdf.model.Resource resource)

Gets the label for a given Resource.

Parameters:

resource - the Resource to get the label of

Returns:

the label (never null)

getNodeLabel

public String getNodeLabel(org.apache.jena.rdf.model.RDFNode node)

appendTemplateCallLabel

public static void appendTemplateCallLabel(StringBuffer buffer,
                                           String labelTemplate,
                                           Map<String,org.apache.jena.rdf.model.RDFNode> args)

Renders a template call's label template into a label by inserting the evaluated SPARQL expressions into appropriate spaces marked with {expression}. Currently only simple variables are supported, e.g. {?test }.

Parameters:

buffer - the StringBuffer to write to

labelTemplate - the labelTemplate

args - the arguments a Map of pre-bound variables (supplied arguments)