org.eclipse.rdf4j.query

Class QueryLanguage

java.lang.Object

org.eclipse.rdf4j.query.QueryLanguage

public class QueryLanguage
extends Object

A type-safe enumeration for RDF query languages such as SPARQL and SeRQL. QueryLanguage objects are identified by their name, which is treated in as case-insensitive way.

Field Summary

Fields

Modifier and Type	Field and Description
static QueryLanguage	SERQL SeRQL (Sesame RDF Query Language) is a Sesame-specific query language for RDF, which predates SPARQL.
static QueryLanguage	SERQO Deprecated. since 2.0. This language is no longer actively supported.
static QueryLanguage	SPARQL SPARQL (Simple Protocol and RDF Query Language) is a W3C Recommendation for querying and updating RDF data.

Constructor Summary

Constructors

Constructor and Description
QueryLanguage(String name) Creates a new QueryLanguage object.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object other)
String	getName() Gets the name of this query language.
int	hashCode()
boolean	hasName(String name)
static void	register(QueryLanguage ql) Registers the specified query language.
static QueryLanguage	register(String name) Registers the specified query language.
String	toString()
static QueryLanguage	valueOf(String qlName) Returns the query language whose name matches the specified name.
static Collection<QueryLanguage>	values() Returns all known/registered query languages.

Methods inherited from class java.lang.Object

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

Field Detail

SERQL

public static final QueryLanguage SERQL

SeRQL (Sesame RDF Query Language) is a Sesame-specific query language for RDF, which predates SPARQL.

See Also:

The SeRQL user manual

SPARQL

public static final QueryLanguage SPARQL

SPARQL (Simple Protocol and RDF Query Language) is a W3C Recommendation for querying and updating RDF data.

See Also:

SPARQL 1.1 Overview

SERQO

@Deprecated
public static final QueryLanguage SERQO

Deprecated. since 2.0. This language is no longer actively supported.

SeRQO (Sesame RDF Query Language - Objects) is a Sesame-specific query language using a syntax suited less for human editing but for easy transfer over the wire.

Constructor Detail

QueryLanguage

public QueryLanguage(String name)

Creates a new QueryLanguage object.

Parameters:

name - The (case-insensitive) name of the query language, e.g. "SPARQL".

Method Detail

values

public static Collection<QueryLanguage> values()

Returns all known/registered query languages.

register

public static QueryLanguage register(String name)

Registers the specified query language.

Parameters:

name - The name of the query language, e.g. "SPARQL".

register

public static void register(QueryLanguage ql)

Registers the specified query language.

valueOf

public static QueryLanguage valueOf(String qlName)

Returns the query language whose name matches the specified name.

Parameters:

qlName - A query language name.

Returns:

The query language whose name matches the specified name, or null if there is no such query language.

getName

public String getName()

Gets the name of this query language.

Returns:

A human-readable format name, e.g. "SPARQL".

hasName

public boolean hasName(String name)

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