Package org.eclipse.rdf4j.query.parser

Class QueryPrologLexer

java.lang.Object

org.eclipse.rdf4j.query.parser.QueryPrologLexer

public class QueryPrologLexer
extends Object

A simple lexer that tokenizes a syntactically legal input SPARQL query string on prolog items (prefixes, base declarations, IRIs, comments, and syntactical tokens such as keywords, opening and closing brackets, and hashes).

Author:

Jeen Broekstra

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	QueryPrologLexer.Token
static enum	QueryPrologLexer.TokenType

Constructor Summary

Constructors

Constructor	Description
QueryPrologLexer()

Method Summary

Modifier and Type	Method	Description
static QueryPrologLexer.Token	getRestOfQueryToken(String input)	Tokenizes the input string on prolog elements and returns the final Token.
static List<QueryPrologLexer.Token>	lex(String input)	Tokenizes a syntactically legal input SPARQL query on prolog elements.

Methods inherited from class java.lang.Object

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

Constructor Details

QueryPrologLexer

public QueryPrologLexer()

Method Details

lex

public static List<QueryPrologLexer.Token> lex(String input)

Tokenizes a syntactically legal input SPARQL query on prolog elements. The last token in the returned list is of type QueryPrologLexer.TokenType.REST_OF_QUERY and contains the SPARQL query string minus the prolog.

Parameters:

input - a syntactically legal SPARQL query string

Returns:

a list with tokens for each prolog element. If the input string is syntactically legal SPARQL, the final returned token is guaranteed to be of type QueryPrologLexer.TokenType.REST_OF_QUERY and to contain the SPARQL query string minus the prolog. If the input string is not syntactically legal SPARQL, the method will still return normally but no guarantees about the returned list are made.

getRestOfQueryToken

public static QueryPrologLexer.Token getRestOfQueryToken(String input)

Tokenizes the input string on prolog elements and returns the final Token. If the input string is a syntactically legal SPARQL query, this Token will be of type QueryPrologLexer.TokenType.REST_OF_QUERY and contain the query string minus prolog.

Parameters:

input - a syntactically legal SPARQL string

Returns:

if the input is syntactically legal SPARQL, a Token containing the query string without prolog. If the input is not syntactically legal, the method will still exist normally, but no guarantees are made about the returned object.