Module org.apache.jena.arq
Package org.apache.jena.sparql.algebra

Class OpLib

java.lang.Object
org.apache.jena.sparql.algebra.OpLib
public class OpLib extends Object
Functions relating to Ops.

  • Constructor Summary

    Constructors
    Constructor
    Description
    OpLib()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static Op
    empty()
    Return an Op that is the join zero - (join empty(), X) = empty).
    static Op
    unionDefaultGraphQuads(Op op)
    Convert a pattern, assumed to be quad form, so that the default graph is the union of named graphs.
    static Op
    unit()
    Return an Op that is the join unit - (join unit(), X) = X).

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • OpLib

      public OpLib()

  • Method Details

    • unionDefaultGraphQuads

      public static Op unionDefaultGraphQuads(Op op)
      Convert a pattern, assumed to be quad form, so that the default graph is the union of named graphs.

    • unit

      public static Op unit()
      Return an Op that is the join unit - (join unit(), X) = X). It is one row of zero columns.

    • empty

      public static Op empty()
      Return an Op that is the join zero - (join empty(), X) = empty). It is zero rows.