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

    • isOpeningAngledBracket

      private boolean isOpeningAngledBracket(String queryString, int pos)

    • isMultilineQuote

      private boolean isMultilineQuote(String queryString, int pos)

    • isEscapeChar

      private boolean isEscapeChar(String queryString, int pos)

    • isDoubleQuote

      private boolean isDoubleQuote(String queryString, int pos)

    • findNextRelevantIndex

      private int findNextRelevantIndex(String queryString, int lastPos, boolean isInsideString)

    • findMatchingPrefix

      private Prefix findMatchingPrefix(String queryString, int pos)
      Returns the longest prefix that is found starting at position pos in the queryString
      Parameters:
      queryString - the query string
      pos - the position at which to start looking
      Returns:
      the longest prefixIri that matches fully (no tie-break for duplicates)

    • isContinuationALocalName

      private boolean isContinuationALocalName(String continuation)

    • findNextWhitespace

      private int findNextWhitespace(String continuation)

    • getIRIStringFromPrefix

      private String getIRIStringFromPrefix(Prefix p)