Package com.yahoo.searchlib.rankingexpression.evaluation

Class MapContext

java.lang.Object
com.yahoo.searchlib.rankingexpression.evaluation.Context
com.yahoo.searchlib.rankingexpression.evaluation.MapContext
All Implemented Interfaces:
com.yahoo.tensor.evaluation.EvaluationContext<Reference>, com.yahoo.tensor.evaluation.TypeContext<Reference>
public class MapContext extends Context
A context backed by a Map
Author:
bratseth

  • Constructor Details

    • MapContext

      public MapContext()

    • MapContext

      public MapContext(Value missingValue)

    • MapContext

      public MapContext(Map<String,Value> bindings)

    • MapContext

      public MapContext(Map<String,Value> bindings, Value missingValue)
      Creates a map context from a map. All the Values of the map will be frozen.

  • Method Details

    • freeze

      public MapContext freeze()
      Freezes this. Returns this for convenience.

    • getType

      public com.yahoo.tensor.TensorType getType(Reference key)
      Returns the type of the given value key, or null if it is not bound.

    • get

      public Value get(String key)
      Returns the value of a key. 0 is returned if the given key is not bound in this.
      Specified by:
      get in class Context
      Parameters:
      key - the name of the variable whose value to return.
      Returns:
      the value of the named variable.

    • put

      public void put(String key, Value value)
      Sets the value of a key. The value is frozen by this.
      Overrides:
      put in class Context
      Parameters:
      key - the name of the variable to set.
      value - the value to set. Ownership of this value is transferred to this - if it is mutable (not frozen) it may be modified during execution

    • bindings

      public Map<String,Value> bindings()
      Returns an immutable view of the bindings of this.

    • thawedCopy

      public MapContext thawedCopy()
      Returns a new, modifiable context containing all the bindings of this

    • names

      public Set<String> names()
      Returns an unmodifiable map of the names of this
      Overrides:
      names in class Context
      Returns:
      the set of all variable names.

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • fromString

      public static MapContext fromString(String contextString)
      A convenience constructor which returns a map context from a string on the form name1:value1, name2:value2 .... Extra spaces are allowed anywhere. Any other deviation from the syntax causes an exception to be thrown.