org.aksw.limes.core.gui.util.sparql

Class SPARQLHelper

java.lang.Object

org.aksw.limes.core.gui.util.sparql.SPARQLHelper

public class SPARQLHelper
extends Object

Helper class for sparql queries

Author:

Daniel Obraczka < soz11ffe@ studserv.uni-leipzig.de>

Field Summary

Fields

Modifier and Type	Field and Description
static String	DBPEDIA_ENDPOINT
static String	DBPEDIA_ENDPOINT_LIVE
static String	DBPEDIA_ENDPOINT_OFFICIAL
protected static Map<String,AdvancedMemoryCache>	samples

Constructor Summary

Constructors

Constructor and Description
SPARQLHelper()

Method Summary

Modifier and Type	Method and Description
static String[]	commonProperties(KBInfo kb, double threshold, Integer limit, Integer sampleSize) returns the common properties
static String	formatPrefixes(Map<String,String> prefixes) puts prefixes in a usable format for sparql query
protected static AdvancedMemoryCache	generateSample(KBInfo kb, int sampleSize) generates samples
protected static AdvancedMemoryCache	getSample(KBInfo kb, int sampleSize) returns samples
static String	lastPartOfURL(String url) gets the last part of a URL
static Set<String>	properties(String endpoint, String graph, String className, org.apache.jena.rdf.model.Model model) gets properties
static Set<String>	propertiesUncached(String endpoint, String graph, String className, org.apache.jena.rdf.model.Model model) Get all Properties of the given knowledge base
static org.apache.jena.query.QueryExecution	queryExecution(String query, String graph, String endpoint, org.apache.jena.rdf.model.Model model) creates a new object of QueryExecution
static org.apache.jena.query.ResultSet	querySelect(String query, String endpoint, String graph, org.apache.jena.rdf.model.Model model) executes query
static Set<String>	resultSetToList(org.apache.jena.query.ResultSet rs) puts result to list
static Set<String>	rootClasses(String endpoint, String graph, org.apache.jena.rdf.model.Model model) returns the root classes of a SPARQL endpoint's ontology ({owl:Thing} normally).
static Set<String>	rootClassesUncached(String endpoint, String graph, org.apache.jena.rdf.model.Model model, Config config) returns the root classes of a SPARQL endpoint's ontology ({owl:Thing} normally).
static Set<String>	subclassesOf(String endpoint, String graph, String clazz, org.apache.jena.rdf.model.Model model) returns subclasses of class
static Set<String>	subClassesOfUncached(String endpoint, String graph, String clazz, org.apache.jena.rdf.model.Model model) returns subclasses of uncached class
static String	wrapIfNecessary(String uriString) helper function for wrapping

Methods inherited from class java.lang.Object

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

Field Detail

DBPEDIA_ENDPOINT_OFFICIAL

public static final String DBPEDIA_ENDPOINT_OFFICIAL

See Also:

Constant Field Values

DBPEDIA_ENDPOINT_LIVE

public static final String DBPEDIA_ENDPOINT_LIVE

See Also:

Constant Field Values

DBPEDIA_ENDPOINT

public static final String DBPEDIA_ENDPOINT

See Also:

Constant Field Values

samples

protected static final Map<String,AdvancedMemoryCache> samples

Constructor Detail

SPARQLHelper

public SPARQLHelper()

Method Detail

formatPrefixes

public static String formatPrefixes(Map<String,String> prefixes)

puts prefixes in a usable format for sparql query

Parameters:

prefixes - prefixes to format

Returns:

formatted prefixes

lastPartOfURL

public static String lastPartOfURL(String url)

gets the last part of a URL

Parameters:

url - url to get the last part of

Returns:

the last part of a RDF resource url, e.g. http://dbpedia.org/ontology/City - > City, http://example.org/ontology#something -> something

subclassesOf

public static Set<String> subclassesOf(String endpoint,
                                       String graph,
                                       String clazz,
                                       org.apache.jena.rdf.model.Model model)

returns subclasses of class

Parameters:

endpoint - endpoint

graph - graph

clazz - class to get subclasses from

model - model

Returns:

subclasses

subClassesOfUncached

public static Set<String> subClassesOfUncached(String endpoint,
                                               String graph,
                                               String clazz,
                                               org.apache.jena.rdf.model.Model model)

returns subclasses of uncached class

Parameters:

endpoint - endpoint

graph - graph

clazz - class to get subclasses from

model - model

Returns:

subclasses

rootClasses

public static Set<String> rootClasses(String endpoint,
                                      String graph,
                                      org.apache.jena.rdf.model.Model model)

returns the root classes of a SPARQL endpoint's ontology ({owl:Thing} normally).

Parameters:

endpoint - endpoint

graph - graph

model - model

Returns:

rootClasses

rootClassesUncached

public static Set<String> rootClassesUncached(String endpoint,
                                              String graph,
                                              org.apache.jena.rdf.model.Model model,
                                              Config config)

returns the root classes of a SPARQL endpoint's ontology ({owl:Thing} normally).

Parameters:

endpoint - endpoint

graph - graph

model - model

Returns:

rootClasses

wrapIfNecessary

public static String wrapIfNecessary(String uriString)

helper function for wrapping

Parameters:

uriString - string to wrap

Returns:

wrapped string

properties

public static Set<String> properties(String endpoint,
                                     String graph,
                                     String className,
                                     org.apache.jena.rdf.model.Model model)

gets properties

Parameters:

endpoint - endpoint

graph - graph

className - class name to get properties from

model - model

Returns:

set of properties

propertiesUncached

public static Set<String> propertiesUncached(String endpoint,
                                             String graph,
                                             String className,
                                             org.apache.jena.rdf.model.Model model)

Get all Properties of the given knowledge base

Parameters:

endpoint - endpoint

graph - can be null (recommended as e.g. rdf:label doesn't have to be in the graph)

className - name of class to get properties from

model - model

Returns:

set of properties

queryExecution

public static org.apache.jena.query.QueryExecution queryExecution(String query,
                                                                  String graph,
                                                                  String endpoint,
                                                                  org.apache.jena.rdf.model.Model model)

creates a new object of QueryExecution

Parameters:

query - query

graph - graph

endpoint - endpoint

model - model

Returns:

QueryExecution object

resultSetToList

public static Set<String> resultSetToList(org.apache.jena.query.ResultSet rs)

puts result to list

Parameters:

rs - set of results

Returns:

set of results

querySelect

public static org.apache.jena.query.ResultSet querySelect(String query,
                                                          String endpoint,
                                                          String graph,
                                                          org.apache.jena.rdf.model.Model model)

executes query

Parameters:

query - query

endpoint - endpoint

graph - graph

model - model

Returns:

ResultSet

getSample

protected static AdvancedMemoryCache getSample(KBInfo kb,
                                               int sampleSize)

returns samples

Parameters:

kb -

sampleSize -

Returns:

generateSample

protected static AdvancedMemoryCache generateSample(KBInfo kb,
                                                    int sampleSize)

generates samples

Parameters:

kb -

sampleSize -

Returns:

commonProperties

public static String[] commonProperties(KBInfo kb,
                                        double threshold,
                                        Integer limit,
                                        Integer sampleSize)
                                 throws Exception

returns the common properties

Parameters:

kb - knowledgebase

threshold - threshold

limit - limit

sampleSize - size of sample

Returns:

string array of common properties

Throws:

Exception - thrown if something goes wrong