Class 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