Class BGPRequestImpl

java.lang.Object
se.liu.ida.hefquin.federation.access.impl.req.BGPRequestImpl
All Implemented Interfaces:
BGPRequest, DataRetrievalRequest, SPARQLRequest
public class BGPRequestImpl extends Object implements BGPRequest

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected final BGP
    bgp
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    BGPRequestImpl(BGP bgp)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    equals(Object o)
     
    boolean
    getDistinctRequired()
    Returns true if this request explicitly requires that the requested result is duplicate free.
    ExpectedVariables
    getExpectedVariables()
    Returns the query variables for which this data retrieval request aims to fetch data (if any), where some of these variables may be 'certain variables' whereas others are 'possible variables'.
    Set<org.apache.jena.sparql.core.Var>
    getProjectionVars()
    Returns the set of variables that should be projected in the result, or null if no projection is specified for this request.
    BGP
    getQueryPattern()
    Returns the graph pattern for which solutions should be requested, or null if this request is based on an actual SPARQL query (to be accessed via the method SPARQLRequest.getQuery().
    int
    hashCode()
     
    String
    toString()
     

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    Methods inherited from interface se.liu.ida.hefquin.federation.access.SPARQLRequest

    getQuery

  • Field Details

    • bgp

      protected final BGP bgp

  • Constructor Details

    • BGPRequestImpl

      public BGPRequestImpl(BGP bgp)

  • Method Details

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • getQueryPattern

      public BGP getQueryPattern()
      Description copied from interface: SPARQLRequest
      Returns the graph pattern for which solutions should be requested, or null if this request is based on an actual SPARQL query (to be accessed via the method SPARQLRequest.getQuery().
      Specified by:
      getQueryPattern in interface BGPRequest
      Specified by:
      getQueryPattern in interface SPARQLRequest

    • getExpectedVariables

      public ExpectedVariables getExpectedVariables()
      Description copied from interface: DataRetrievalRequest
      Returns the query variables for which this data retrieval request aims to fetch data (if any), where some of these variables may be 'certain variables' whereas others are 'possible variables'. For the distinction between these two types of variables, refer to ExpectedVariables.getCertainVariables() and to
      invalid @link 
      {@link ExpectedVariables#getPossibleVariables())
      }. For instance, if this request is about fetching triples that match a given triple pattern, then the variables of that triple pattern would be returned here as certain variables. Note that the method may also return null (which would be the case for types of data retrieval requests for which this method is not applicable in any reasonable way).
      Specified by:
      getExpectedVariables in interface DataRetrievalRequest

    • toString

      public String toString()
      Specified by:
      toString in interface DataRetrievalRequest
      Overrides:
      toString in class Object

    • getProjectionVars

      public Set<org.apache.jena.sparql.core.Var> getProjectionVars()
      Description copied from interface: SPARQLRequest
      Returns the set of variables that should be projected in the result, or null if no projection is specified for this request.

      If a non-null set is returned (including the empty set), then projection is considered an explicit part of this request and must be respected by components that can support it.

      Deciding whether such a projection can be safely applied or pushed into a request is the responsibility of the query planning and rewriting logic, not of this interface or its implementations.

      Specified by:
      getProjectionVars in interface SPARQLRequest

    • getDistinctRequired

      public boolean getDistinctRequired()
      Description copied from interface: SPARQLRequest
      Returns true if this request explicitly requires that the requested result is duplicate free.
      Specified by:
      getDistinctRequired in interface SPARQLRequest
      Returns:
      true if duplicate elimination is requested; false otherwise