com.redhat.lightblue.eval

Class ArrayProjector

java.lang.Object

com.redhat.lightblue.eval.Projector

com.redhat.lightblue.eval.ArrayProjector

Direct Known Subclasses:

ArrayQueryProjector, ArrayRangeProjector

public abstract class ArrayProjector
extends Projector

Base class for array projectors.

Constructor Summary

Constructors

Constructor and Description
ArrayProjector(ArrayProjection p, Path ctxPath, FieldTreeNode context) Sets up the projector context

Method Summary

Methods

Modifier and Type	Method and Description
Path	getArrayFieldPattern()
Projector	getNestedProjector() Returns the nested projector
Sort	getSort()
protected boolean	isIncluded()
Projection.Inclusion	project(Path p, QueryEvaluationContext ctx) Returns true, false, or null if the result cannot be determined.
protected abstract Projection.Inclusion	projectArray(Path p, QueryEvaluationContext ctx) Check if the array element matches.
com.fasterxml.jackson.databind.node.ArrayNode	sortArray(com.fasterxml.jackson.databind.node.ArrayNode array, com.fasterxml.jackson.databind.node.JsonNodeFactory factory) Sorts the given array node using the sort criteria given in this ArrayProjector

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

ArrayProjector

public ArrayProjector(ArrayProjection p,
              Path ctxPath,
              FieldTreeNode context)

Sets up the projector context

Method Detail

isIncluded

protected boolean isIncluded()

getArrayFieldPattern

public Path getArrayFieldPattern()

getSort

public Sort getSort()

getNestedProjector

public Projector getNestedProjector()

Returns the nested projector

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

sortArray

public com.fasterxml.jackson.databind.node.ArrayNode sortArray(com.fasterxml.jackson.databind.node.ArrayNode array,
                                                      com.fasterxml.jackson.databind.node.JsonNodeFactory factory)

Sorts the given array node using the sort criteria given in this ArrayProjector

Parameters:

array - The array node to sort

factory - Json node factory If there is a sort criteria defined in this, the array elements are sorted using that.

Returns:

A new ArrayNode containing the sorted elements, or if there is no sort defined, the array itself

projectArray

protected abstract Projection.Inclusion projectArray(Path p,
                                QueryEvaluationContext ctx)

Check if the array element matches. This is called after determining that the path points to a field that can be interpreted by this projector.