Package stream.nebula.operators

Class FilterOperator

java.lang.Object

stream.nebula.operators.Operator

stream.nebula.operators.FilterOperator

public class FilterOperator
extends Operator

This Operator encodes a Query.filter(stream.nebula.expression.LogicalExpression) operation.

Field Summary

Fields inherited from class stream.nebula.operators.Operator

childOperator

Constructor Summary

Constructors

Constructor	Description
FilterOperator(@NonNull Operator childOperator, @NonNull LogicalExpression expression)	Create a new FilterOperator.

Method Summary

Modifier and Type	Method	Description
LogicalExpression	getFilterExpression()	Access the filter expression.

Methods inherited from class stream.nebula.operators.Operator

getChildOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterOperator

public FilterOperator(@NonNull Operator childOperator,
                      @NonNull LogicalExpression expression)
               throws java.lang.IllegalStateException

Create a new FilterOperator.

Parameters:

childOperator - The previous operator in the operator chain of Query instance.

expression - The filter expression.

Throws:

java.lang.IllegalStateException - If expression is null.

Method Detail

getFilterExpression

public LogicalExpression getFilterExpression()

Access the filter expression.

Returns:

The filter expression specified in the call to Query.filter(stream.nebula.expression.LogicalExpression).