org.eclipse.rdf4j.sail.federation.optimizers

## Class EvaluationStatistics.CardinalityCalculator

- java.lang.Object
- - org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor<RuntimeException>
  - - org.eclipse.rdf4j.sail.federation.optimizers.EvaluationStatistics.CardinalityCalculator

- All Implemented Interfaces:
    QueryModelVisitor<RuntimeException>
  Enclosing class:
    EvaluationStatistics

      protected static class EvaluationStatistics.CardinalityCalculator
      extends AbstractQueryModelVisitor<RuntimeException>

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected double` | `cardinality`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `CardinalityCalculator()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected int` | `countConstantVars(Iterable<Var> vars)`
    `double` | `getCardinality()`
    `protected double` | `getCardinality(StatementPattern pattern)`
    `void` | `meet(EmptySet node)`
    `void` | `meet(Join node)`
    `void` | `meet(LeftJoin node)`
    `void` | `meet(SingletonSet node)`
    `void` | `meet(Slice slice)`
    `void` | `meet(StatementPattern pattern)`
    `protected void` | `meetBinaryTupleOperator(BinaryTupleOperator node)` Method called by all `meet` methods with a `BinaryTupleOperator` node as argument.
    `void` | `meetMultiJoin(NaryJoin node)`
    `void` | `meetOther(QueryModelNode node)`

    - ### Methods inherited from class org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor

      `meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetNode, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnaryValueOperator, meetUpdateExpr`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### cardinality

          protected double cardinality

  - ### Constructor Detail

    - #### CardinalityCalculator

          protected CardinalityCalculator()

  - ### Method Detail

    - #### getCardinality

          public double getCardinality()

    - #### meet

          public void meet(EmptySet node)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meet

          public void meet(SingletonSet node)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meet

          public void meet(StatementPattern pattern)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meet

          public void meet(Slice slice)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### getCardinality

          protected double getCardinality(StatementPattern pattern)

    - #### countConstantVars

          protected int countConstantVars(Iterable<Var> vars)

    - #### meetOther

          public void meetOther(QueryModelNode node)

      Specified by:
        `meetOther` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meetOther` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meetMultiJoin

          public void meetMultiJoin(NaryJoin node)

    - #### meet

          public void meet(Join node)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meet

          public void meet(LeftJoin node)

      Specified by:
        `meet` in interface `QueryModelVisitor<RuntimeException>`
      Overrides:
        `meet` in class `AbstractQueryModelVisitor<RuntimeException>`

    - #### meetBinaryTupleOperator

          protected void meetBinaryTupleOperator(BinaryTupleOperator node)

      Description copied from class: `AbstractQueryModelVisitor`
      Method called by all `meet` methods with a `BinaryTupleOperator` node as argument. Forwards the call to `AbstractQueryModelVisitor.meetNode(org.eclipse.rdf4j.query.algebra.QueryModelNode)` by default.
      Overrides:
        `meetBinaryTupleOperator` in class `AbstractQueryModelVisitor<RuntimeException>`
      Parameters:
        `node` - The node that is being visited.

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