com.yahoo.bullet.querying.evaluators

Class FieldEvaluator

java.lang.Object

com.yahoo.bullet.querying.evaluators.Evaluator

com.yahoo.bullet.querying.evaluators.FieldEvaluator

All Implemented Interfaces:

Serializable

public class FieldEvaluator
extends Evaluator

An evaluator that extracts a given field from a BulletRecord. This is the only evaluator that directly takes a BulletRecord.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	FieldEvaluator.FieldExtractor

Constructor Summary

Constructors

Constructor and Description
FieldEvaluator(FieldExpression fieldExpression) Constructor that creates a field evaluator from a FieldExpression.

Method Summary

Modifier and Type	Method and Description
com.yahoo.bullet.typesystem.TypedObject	evaluate(com.yahoo.bullet.record.BulletRecord record) Evaluates this evaluator on the given BulletRecord.

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldEvaluator

public FieldEvaluator(FieldExpression fieldExpression)

Constructor that creates a field evaluator from a FieldExpression.

Parameters:

fieldExpression - The field expression to construct the evaluator from.

Method Detail

evaluate

public com.yahoo.bullet.typesystem.TypedObject evaluate(com.yahoo.bullet.record.BulletRecord record)

Description copied from class: Evaluator

Evaluates this evaluator on the given BulletRecord.

Specified by:

evaluate in class Evaluator

Parameters:

record - The Bullet record to evaluate this evaluator on.

Returns:

The result of this evaluator on the given Bullet record.