com.redhat.lightblue.eval

Class FieldComparisonEvaluator

java.lang.Object

com.redhat.lightblue.eval.QueryEvaluator

com.redhat.lightblue.eval.FieldComparisonEvaluator

public class FieldComparisonEvaluator
extends QueryEvaluator

Evaluates lfield op rfield type comparisons. Both fields can be simple fields or arrays. Here's the semantics of the operation:

• lfield op rfield : true if lfield op rfield
• lfield op rarray: true if lfield op rarray[i] for all elements i
• larray op rarray: true if larray[i] op rarray[i] for all elements i. for op other than $ne, array sizes must be equal

Constructor Summary

Constructors

Constructor and Description
FieldComparisonEvaluator(FieldComparisonExpression expr, FieldTreeNode context) Constructs evaluator for {field op field} style comparison

Method Summary

Methods

Modifier and Type	Method and Description
boolean	evaluate(QueryEvaluationContext ctx)

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

evaluate, getInstance, getInstance

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldComparisonEvaluator

public FieldComparisonEvaluator(FieldComparisonExpression expr,
                        FieldTreeNode context)

Constructs evaluator for {field op field} style comparison

Parameters:

expr - The expression

md - Entity metadata

context - The path relative to which the expression will be evaluated

Method Detail

evaluate

public boolean evaluate(QueryEvaluationContext ctx)

Specified by:

evaluate in class QueryEvaluator