Package org.aksw.jena_sparql_api.algebra.analysis

Class DistinctExtendFilter2

java.lang.Object
org.aksw.jena_sparql_api.algebra.analysis.DistinctExtendFilter2
public class DistinctExtendFilter2 extends Object
This class captures the following generic SPARQL query set: Select (project / extend) { // postDistinctVarDefs select distinct (project / extend) { // preDestinctVarDefs [subOp] filter(...) } } - if there is no distinct, there are no post-distinct definitions (indicated by null); only pre-distinct ones - the filters are always expressed to reference pre-distinct variables this means, that any filter must be expanded first using the post-distinct definitions and subsequently the pre-distsinct definitions - initially: as long as there is no distinct encountered: - have all projections / expressions affect the pre-distinct definitions When encountering distinct: - Any new distinct makes a prior one obsolete. - The postDistinct expressions become simply identity mappings of the pre-distinct definitions Note: It is possible to have nested distinct's that cannot be flattened, such as: Extend(?foo = , Distinct(?s ... )
Author:
raven

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected ExprHolder
    filter
     
    protected boolean
    isDistinct
     
    protected Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr>
    postDistinctVarDefs
     
    protected Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr>
    preDistinctVarDefs
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    DistinctExtendFilter2(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varToDef, boolean distinct, ExprHolder filter)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    DistinctExtendFilter2
    applyDistinct()
    Conceptually overrides a prior distinct, and marks all so far visible variables as distinct - If there was no prior distinct: Initialize the post distinct map to an identity mapping of the visible variables after pre-distinct - Otherwise Merge the current post-distinct definitions with the pre-distinct ones: Create a post-distinct identity mapping with all visible variables of pre-distinct
    DistinctExtendFilter2
    applyExtend(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> extend)
     
    DistinctExtendFilter2
    applyExtend(org.apache.jena.sparql.core.VarExprList extend)
     
    DistinctExtendFilter2
    applyFilter(org.apache.jena.sparql.expr.Expr contribExpr)
    Expand any filter according to any prior extend
    DistinctExtendFilter2
    applyFilter(org.apache.jena.sparql.expr.ExprList contribExprs)
     
    DistinctExtendFilter2
    applyProject(Collection<org.apache.jena.sparql.core.Var> projectVars)
    Update the projection
    static DistinctExtendFilter2
    create()
     
    static DistinctExtendFilter2
    create(Collection<org.apache.jena.sparql.core.Var> initialVars)
     
    static org.apache.jena.sparql.expr.ExprTransform
    createExprTransform(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)
     
    static Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr>
    createIdentityMap(Collection<org.apache.jena.sparql.core.Var> vars)
     
    static Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr>
    expandDefs(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> src, Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)
     
    org.apache.jena.sparql.expr.Expr
    expandExpr(org.apache.jena.sparql.expr.Expr expr)
     
    static org.apache.jena.sparql.expr.Expr
    expandExpr(org.apache.jena.sparql.expr.Expr expr, Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)
     
    static void
    main(String[] args)
     
    org.apache.jena.sparql.algebra.Op
    toOp(org.apache.jena.sparql.algebra.Op result)
     
    String
    toString()
     
    static String
    toString(Map.Entry<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> e)
     
    static String
    toString(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)
     

    Methods inherited from class java.lang.Object

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

  • Field Details

    • postDistinctVarDefs

      protected Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> postDistinctVarDefs

    • isDistinct

      protected boolean isDistinct

    • preDistinctVarDefs

      protected Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> preDistinctVarDefs

    • filter

      protected ExprHolder filter

  • Constructor Details

    • DistinctExtendFilter2

      public DistinctExtendFilter2(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varToDef, boolean distinct, ExprHolder filter)

  • Method Details

    • toOp

      public org.apache.jena.sparql.algebra.Op toOp(org.apache.jena.sparql.algebra.Op result)

    • create

      public static DistinctExtendFilter2 create()

    • createIdentityMap

      public static Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> createIdentityMap(Collection<org.apache.jena.sparql.core.Var> vars)

    • create

      public static DistinctExtendFilter2 create(Collection<org.apache.jena.sparql.core.Var> initialVars)

    • applyProject

      public DistinctExtendFilter2 applyProject(Collection<org.apache.jena.sparql.core.Var> projectVars)
      Update the projection
      Parameters:
      projectVars -
      Returns:

    • applyDistinct

      public DistinctExtendFilter2 applyDistinct()
      Conceptually overrides a prior distinct, and marks all so far visible variables as distinct - If there was no prior distinct: Initialize the post distinct map to an identity mapping of the visible variables after pre-distinct - Otherwise Merge the current post-distinct definitions with the pre-distinct ones: Create a post-distinct identity mapping with all visible variables of pre-distinct
      Returns:

    • applyExtend

      public DistinctExtendFilter2 applyExtend(org.apache.jena.sparql.core.VarExprList extend)

    • applyExtend

      public DistinctExtendFilter2 applyExtend(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> extend)

    • applyFilter

      public DistinctExtendFilter2 applyFilter(org.apache.jena.sparql.expr.ExprList contribExprs)

    • applyFilter

      public DistinctExtendFilter2 applyFilter(org.apache.jena.sparql.expr.Expr contribExpr)
      Expand any filter according to any prior extend
      Parameters:
      exprHolder -
      Returns:

    • toString

      public static String toString(Map.Entry<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> e)

    • toString

      public static String toString(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • expandExpr

      public org.apache.jena.sparql.expr.Expr expandExpr(org.apache.jena.sparql.expr.Expr expr)

    • expandDefs

      public static Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> expandDefs(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> src, Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)

    • createExprTransform

      public static org.apache.jena.sparql.expr.ExprTransform createExprTransform(Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)

    • expandExpr

      public static org.apache.jena.sparql.expr.Expr expandExpr(org.apache.jena.sparql.expr.Expr expr, Map<org.apache.jena.sparql.core.Var,org.apache.jena.sparql.expr.Expr> varDefs)

    • main

      public static void main(String[] args)