Package com.yahoo.searchlib.rankingexpression.rule

Class ExpressionNode

java.lang.Object

com.yahoo.searchlib.rankingexpression.rule.ExpressionNode

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

CompositeNode, ConstantNode, GBDTForestNode, GBDTNode, NameNode

public abstract class ExpressionNode
extends Object
implements Serializable

Superclass of all expression nodes. Expression nodes have their identity determined by their content. All expression nodes are immutable.

Author:

Simon Thoresen Hult

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ExpressionNode()

Method Summary

Modifier and Type	Method	Description
final boolean	equals(Object obj)
abstract Value	evaluate(Context context)	Returns the value of evaluating this expression over the given context.
abstract int	hashCode()	Returns a hashcode computed from the data in this
final String	toString()
final StringBuilder	toString(SerializationContext context)
abstract StringBuilder	toString(StringBuilder builder, SerializationContext context, Deque<String> path, CompositeNode parent)	Returns this in serialized form.
abstract com.yahoo.tensor.TensorType	type(com.yahoo.tensor.evaluation.TypeContext<Reference> context)	Returns the type this will return if evaluated with the given context.

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionNode

public ExpressionNode()

Method Details

toString

public abstract StringBuilder toString(StringBuilder builder,
 SerializationContext context,
 Deque<String> path,
 CompositeNode parent)

Returns this in serialized form.

Parameters:

builder - the StringBuilder that will be appended to

context - the serialization context

path - the call path to this, used for cycle detection, or null if this is a root

parent - the parent node of this, or null if it is a root

Returns:

the main script, referring to script instances.

type

public abstract com.yahoo.tensor.TensorType type(com.yahoo.tensor.evaluation.TypeContext<Reference> context)

Returns the type this will return if evaluated with the given context.

Parameters:

context - the variable type bindings to use for this evaluation

Throws:

IllegalArgumentException - if there are variables which are not bound in the given map

evaluate

public abstract Value evaluate(Context context)

Returns the value of evaluating this expression over the given context.

Parameters:

context - the variable bindings to use for this evaluation

Throws:

IllegalArgumentException - if there are variables which are not bound in the given map

toString

public final StringBuilder toString(SerializationContext context)

equals

public final boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public abstract int hashCode()

Returns a hashcode computed from the data in this

Overrides:

hashCode in class Object

toString

public final String toString()

Overrides:

toString in class Object