Package org.aksw.jena_sparql_api.algebra.transform

Class TransformExistsToOptional

java.lang.Object
org.apache.jena.sparql.algebra.TransformCopy
org.aksw.jena_sparql_api.algebra.transform.TransformExistsToOptional
All Implemented Interfaces:
org.apache.jena.sparql.algebra.Transform
public class TransformExistsToOptional extends org.apache.jena.sparql.algebra.TransformCopy
Transformer that rewrites 
 FILTER EXISTS { pattern }
into 
 OPTIONAL { pattern }
 FILTER BOUND(?v) # where ?v is an arbitrary variable exclusive to pattern
This is generally NOT an equivalence transformation, as the optional block may cause altering the cardinalities of bindings from the left hand side.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    class 
    TransformExistsToOptional.ExprTransformExistsToOptional
     

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected org.aksw.commons.collections.generator.Generator<org.apache.jena.sparql.core.Var>
    varGen
     

    Fields inherited from class org.apache.jena.sparql.algebra.TransformCopy

    COPY_ALWAYS, COPY_ONLY_ON_CHANGE

  • Constructor Summary

    Constructors
    Constructor
    Description
    TransformExistsToOptional()
     
    TransformExistsToOptional(org.aksw.commons.collections.generator.Generator<org.apache.jena.sparql.core.Var> varGen)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static TransformExistsToOptional
    create(org.apache.jena.sparql.algebra.Op inputOp)
     
    static void
    main(String[] args)
     
    org.apache.jena.sparql.algebra.Op
    transform(org.apache.jena.sparql.algebra.op.OpFilter opFilter, org.apache.jena.sparql.algebra.Op subOp)
     

    Methods inherited from class org.apache.jena.sparql.algebra.TransformCopy

    transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform

    Methods inherited from class java.lang.Object

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

  • Field Details

    • varGen

      protected org.aksw.commons.collections.generator.Generator<org.apache.jena.sparql.core.Var> varGen

  • Constructor Details

    • TransformExistsToOptional

      public TransformExistsToOptional()

    • TransformExistsToOptional

      public TransformExistsToOptional(org.aksw.commons.collections.generator.Generator<org.apache.jena.sparql.core.Var> varGen)

  • Method Details

    • create

      public static TransformExistsToOptional create(org.apache.jena.sparql.algebra.Op inputOp)

    • transform

      public org.apache.jena.sparql.algebra.Op transform(org.apache.jena.sparql.algebra.op.OpFilter opFilter, org.apache.jena.sparql.algebra.Op subOp)
      Specified by:
      transform in interface org.apache.jena.sparql.algebra.Transform
      Overrides:
      transform in class org.apache.jena.sparql.algebra.TransformCopy

    • main

      public static void main(String[] args)