Package com.yahoo.searchlib.rankingexpression.evaluation

Class AbstractArrayContext

java.lang.Object
com.yahoo.searchlib.rankingexpression.evaluation.Context
com.yahoo.searchlib.rankingexpression.evaluation.AbstractArrayContext
All Implemented Interfaces:
ContextIndex, com.yahoo.tensor.evaluation.EvaluationContext<Reference>, com.yahoo.tensor.evaluation.TypeContext<Reference>, Cloneable
Direct Known Subclasses:
ArrayContext, DoubleOnlyArrayContext
public abstract class AbstractArrayContext extends Context implements Cloneable, ContextIndex
Superclass of contexts which supports array index based lookup. Instances may be reused indefinitely for evaluations of a single ranking expression, in a single thread at the time.
Author:
bratseth

  • Constructor Details

    • AbstractArrayContext

      protected AbstractArrayContext(RankingExpression expression)
      Create a fast lookup context for an expression. This instance should be reused indefinitely by a single thread. This will fail if unknown values are attempted added.

    • AbstractArrayContext

      protected AbstractArrayContext(RankingExpression expression, boolean ignoreUnknownValues)

    • AbstractArrayContext

      protected AbstractArrayContext(RankingExpression expression, boolean ignoreUnknownValues, Value missingValue)
      Create a fast lookup context for an expression. This instance should be reused indefinitely by a single thread.
      Parameters:
      expression - the expression to create a context for
      ignoreUnknownValues - whether attempts to put values not present in this expression should fail (false - the default), or be ignored (true)

  • Method Details

    • nameToIndex

      protected final Map<String,Integer> nameToIndex()

    • doubleValues

      protected final double[] doubleValues()

    • ignoreUnknownValues

      protected final boolean ignoreUnknownValues()

    • names

      public Set<String> names()
      Description copied from class: Context
      Returns all the names available in this, or throws an UnsupportedOperationException if this operation is not supported. This default implementation does the latter.
      Overrides:
      names in class Context
      Returns:
      the set of all variable names.

    • getIndex

      public final int getIndex(String name)
      Returns the index from a name.
      Specified by:
      getIndex in interface ContextIndex
      Throws:
      NullPointerException - is this name is not known to this context

    • size

      public int size()
      Returns the max number of variables which may be set in this
      Specified by:
      size in interface ContextIndex

    • getDouble

      public double getDouble(int index)
      Perform a fast lookup directly of the value as a double. This is faster than get(index).asDouble()
      Specified by:
      getDouble in interface ContextIndex
      Overrides:
      getDouble in class Context
      Parameters:
      index - the index of the variable whose value to return.
      Returns:
      the value of the indexed variable.

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • clone

      public AbstractArrayContext clone()
      Creates a clone of this context suitable for evaluating against the same ranking expression in a different thread (i.e, name name to index map, different value set.
      Overrides:
      clone in class Object