com.redhat.lightblue.eval

Class FieldProjector

java.lang.Object

com.redhat.lightblue.eval.Projector

com.redhat.lightblue.eval.FieldProjector

public class FieldProjector
extends Projector

Constructor Summary

Constructors

Constructor and Description
FieldProjector(FieldProjection p, Path ctxPath, FieldTreeNode ctx)

Method Summary

Modifier and Type	Method and Description
Projector	getNestedProjector() Returns the nested projector for this path *only if* project returns true.
Projection.Inclusion	project(Path p, QueryEvaluationContext ctx) Returns true, false, or null if the result cannot be determined.

Methods inherited from class com.redhat.lightblue.eval.Projector

getInstance, getInstance, project

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldProjector

public FieldProjector(FieldProjection p,
                      Path ctxPath,
                      FieldTreeNode ctx)

Method Detail

getNestedProjector

public Projector getNestedProjector()

Description copied from class: Projector

Returns the nested projector for this path *only if* project returns true. Nested projector is used to project array elements. When a nested projector exists, projection operation should use the nested projector to project array elements. May return null, which means to continue using existing projector (this).

Specified by:

getNestedProjector in class Projector

project

public Projection.Inclusion project(Path p,
                                    QueryEvaluationContext ctx)

Description copied from class: Projector

Returns true, false, or null if the result cannot be determined.

Specified by:

project in class Projector

Parameters:

p - The absolute field path

ctx - Query evaluation context