Package net.ontopia.topicmaps.query.impl.utils

Class PredicateDrivenCostEstimator

java.lang.Object
net.ontopia.topicmaps.query.impl.utils.CostEstimator
net.ontopia.topicmaps.query.impl.utils.PredicateDrivenCostEstimator
public class PredicateDrivenCostEstimator extends CostEstimator

  • Field Details

    • INFINITE_RESULT

      public static int INFINITE_RESULT

    • WHOLE_TM_RESULT

      public static int WHOLE_TM_RESULT

    • BIG_RESULT

      public static int BIG_RESULT

    • MEDIUM_RESULT

      public static int MEDIUM_RESULT

    • SMALL_RESULT

      public static int SMALL_RESULT

    • SINGLE_RESULT

      public static int SINGLE_RESULT

    • FILTER_RESULT

      public static int FILTER_RESULT

    • FAIL_RESULT

      public static int FAIL_RESULT

  • Constructor Details

    • PredicateDrivenCostEstimator

      public PredicateDrivenCostEstimator()

  • Method Details

    • computeCost

      public int computeCost(Set context, AbstractClause clause, Set literalvars, String rulename)
      INTERNAL: Computes the cost of evaluating the given clause in the given context of variable bindings. The cost largely depends on the number of unbound variables in the clause.
      Specified by:
      computeCost in class CostEstimator
      Parameters:
      context - A set of bound variables.
      clause - The clause whose cost we want to compute.
      literalvars - Contains the variables representing literals. Only an issue in rules.
      rulename - The name of the current rule (so we can delay recursive evaluation).

    • getComparisonPredicateCost

      public static int getComparisonPredicateCost(boolean[] boundparams)