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

Class PrefixHelper

java.lang.Object

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

public class PrefixHelper
extends Object

Helper class for prefixes in sparql queries

Author:

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	PrefixHelper.LazyLoaded

Constructor Summary

Constructors

Constructor and Description
PrefixHelper()

Method Summary

Modifier and Type	Method and Description
static String	abbreviate(String uri) returns the abbreviation of an uri
static void	addPrefix(String prefix, String uri) Adds a new prefix to the PrefixHelper (not persistent).
static String	addPrefixes(String query)
static String	expand(String shortURI) expands an uri (reversal of abbreviation)
static String	formatPrefixes(Map<String,String> prefixes) Transforms a prefix map into sparql "PREFIX x: <...>" statements.
static String[]	generatePrefix(String fullURI) Generated an unused prefix for a uri if there is none and add it to the PrefixHelper (not persistent).
static String	getBase(String uri)
static String	getPrefix(String uri) returns prefixes
static Map<String,String>	getPrefixes() returns prefixes
static String	getSuffix(String uri)
static String	getURI(String prefix) returns uri
static Map<String,String>	restrictPrefixes(Map<String,String> prefixes, String query) returns only the subset of the given prefixes that is referenced in the query

Methods inherited from class java.lang.Object

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

Constructor Detail

PrefixHelper

public PrefixHelper()

Method Detail

addPrefix

public static void addPrefix(String prefix,
                             String uri)

Adds a new prefix to the PrefixHelper (not persistent). Threadsafe.

Parameters:

prefix - the abbreviated url, example "dbo"

uri - the url to abbreviate, e.g. "http://dbpedia.org/ontology/

generatePrefix

public static String[] generatePrefix(String fullURI)

Generated an unused prefix for a uri if there is none and add it to the PrefixHelper (not persistent).

Parameters:

fullURI - the full uri, for example "http://dbpedia.org/resource/Elephant"

Returns:

String[]{prefix,url}

addPrefixes

public static String addPrefixes(String query)

restrictPrefixes

public static Map<String,String> restrictPrefixes(Map<String,String> prefixes,
                                                  String query)

returns only the subset of the given prefixes that is referenced in the query

Parameters:

prefixes - prefixes to restrict

query - query from which the prefixes to be restricted are extracted

Returns:

restricted prefixes

getPrefixes

public static Map<String,String> getPrefixes()

returns prefixes

Returns:

prefixes

getPrefix

public static String getPrefix(String uri)

returns prefixes

Parameters:

uri - uri

Returns:

prefix prefix

getURI

public static String getURI(String prefix)

returns uri

Parameters:

prefix - prefix

Returns:

uri uri

getSuffix

public static String getSuffix(String uri)

Parameters:

uri - a URI, either in expanded form like "http://dbpedia.org/ontology/Settlement" or in abbreviated form like "dbo:Settlement".

Returns:

the suffix (last part) of the URI. The suffix of "http://dbpedia.org/ontology/Settlement" is "Settlement", for example.

getBase

public static String getBase(String uri)

Parameters:

uri - a URI, either in expanded form like "http://dbpedia.org/ontology/Settlement" or in abbreviated form like "dbo:Settlement".

Returns:

the base (first part) of the URI. The base of "http://dbpedia.org/ontology/Settlement" is "http://dbpedia.org/ontology/", for example.

abbreviate

public static String abbreviate(String uri)

returns the abbreviation of an uri

Parameters:

uri - uri

Returns:

abbreviation abbreviation

expand

public static String expand(String shortURI)

expands an uri (reversal of abbreviation)

Parameters:

shortURI - shortURI

Returns:

expanded URI

formatPrefixes

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

Transforms a prefix map into sparql "PREFIX x: <...>" statements.

Parameters:

prefixes - prefixes

Returns:

formatted prefix