Package org.aksw.jena_sparql_api.sparql_path2

Class PropertyFunctionPathFinder

java.lang.Object
org.apache.jena.sparql.pfunction.PropertyFunctionBase
org.apache.jena.sparql.pfunction.PropertyFunctionEval
org.aksw.jena_sparql_api.sparql_path2.PropertyFunctionPathFinder
All Implemented Interfaces:
org.apache.jena.sparql.pfunction.PropertyFunction
public class PropertyFunctionPathFinder extends org.apache.jena.sparql.pfunction.PropertyFunctionEval
Select ?path { ?s path:find (?expr ?path ?target ?k) }
  • ?s: The start node for which to find paths
  • ?expr: A string representation of a property expression
  • ?path: The target variable, this variable will be bound to
  • ?target: A target node the property path must terminate it
  • ?k: How many paths, ordered by length, to retrieve
?path i
Author:
raven

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected Function<org.aksw.jenax.dataaccess.sparql.datasource.RDFDataSource,SparqlKShortestPathFinder>
    dataSourceToPathFinder
     
    static final String
    DEFAULT_IRI
     
    static final String
    NORSE_NS
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    PropertyFunctionPathFinder(Function<org.aksw.jenax.dataaccess.sparql.datasource.RDFDataSource,SparqlKShortestPathFinder> dataSourceToPathFinder)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    org.apache.jena.sparql.engine.QueryIterator
    execEvaluated(org.apache.jena.sparql.engine.binding.Binding binding, org.apache.jena.sparql.pfunction.PropFuncArg argSubject, org.apache.jena.graph.Node predicate, org.apache.jena.sparql.pfunction.PropFuncArg argObject, org.apache.jena.sparql.engine.ExecutionContext execCxt)
     
    static org.aksw.jenax.arq.util.node.NodeList
    pathToNodeList(org.aksw.commons.util.triplet.TripletPath<org.apache.jena.graph.Node,org.aksw.commons.util.Directed<org.apache.jena.graph.Node>> path)
    The result array for a path is always: [ start, end, (property, direction, target)* ] This way, the edges of a path can be iterated using

    Methods inherited from class org.apache.jena.sparql.pfunction.PropertyFunctionEval

    exec

    Methods inherited from class org.apache.jena.sparql.pfunction.PropertyFunctionBase

    build, exec

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Constructor Details

    • PropertyFunctionPathFinder

      public PropertyFunctionPathFinder(Function<org.aksw.jenax.dataaccess.sparql.datasource.RDFDataSource,SparqlKShortestPathFinder> dataSourceToPathFinder)

  • Method Details

    • execEvaluated

      public org.apache.jena.sparql.engine.QueryIterator execEvaluated(org.apache.jena.sparql.engine.binding.Binding binding, org.apache.jena.sparql.pfunction.PropFuncArg argSubject, org.apache.jena.graph.Node predicate, org.apache.jena.sparql.pfunction.PropFuncArg argObject, org.apache.jena.sparql.engine.ExecutionContext execCxt)
      Specified by:
      execEvaluated in class org.apache.jena.sparql.pfunction.PropertyFunctionEval

    • pathToNodeList

      public static org.aksw.jenax.arq.util.node.NodeList pathToNodeList(org.aksw.commons.util.triplet.TripletPath<org.apache.jena.graph.Node,org.aksw.commons.util.Directed<org.apache.jena.graph.Node>> path)
      The result array for a path is always: [ start, end, (property, direction, target)* ] This way, the edges of a path can be iterated using 
         BIND(array:size(?path) AS n)
   (2 ?n 3) number:range ?idx
   BIND(array:get(?path, ?idx) AS ?property)
   BIND(array:get(?path, ?idx + 1) AS ?direction)
   BIND(array:get(?path, ?idx + 2) AS ?target)
      Parameters:
      path -
      Returns: