Package org.eclipse.rdf4j.sparqlbuilder.core

Class PrefixDeclarations

java.lang.Object
org.eclipse.rdf4j.sparqlbuilder.core.QueryElementCollection<Prefix>
org.eclipse.rdf4j.sparqlbuilder.core.StandardQueryElementCollection<Prefix>
org.eclipse.rdf4j.sparqlbuilder.core.PrefixDeclarations
All Implemented Interfaces:
QueryElement
public class PrefixDeclarations extends StandardQueryElementCollection<Prefix>
A collection of SPARQL Prefix declarations
See Also:

  • Constructor Details

    • PrefixDeclarations

      public PrefixDeclarations()

  • Method Details

    • addPrefix

      public PrefixDeclarations addPrefix(Prefix... prefixes)
      Add prefix declarations to this collection
      Parameters:
      prefixes - the prefixes
      Returns:
      this

    • replacePrefixesInQuery

      public String replacePrefixesInQuery(String queryString)
      Replaces all occurrences of all declared namespaces with their prefix labels in the specified query string.

      For example, if the foaf: prefix is declared with PrefixDeclarations, the query 

       SELECT ?name WHERE {
   ?x <http://xmlns.com/foaf/0.1/name> ?name .
 }

      is transformed to 

       SELECT ?name WHERE {
   ?x foaf:name ?name .
 }

      Rules applied:

      • The longest matching namespace wins (if one namespace is a substring of another)
      • No replacement if the namespace occurs in a string, i.e., within " or '''
      • Only replace if the continuation of the match is a local name (
      Parameters:
      queryString - the query string
      Returns:
      the query string, namespaces replaced with prefix label