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 and Description
    --- | ---
    `static class` | `QueryPrologLexer.Token`
    `static class` | `QueryPrologLexer.TokenType`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `QueryPrologLexer()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and 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 Detail

    - #### QueryPrologLexer

          public QueryPrologLexer()

  - ### Method Detail

    - #### 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.

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