Package io.deephaven.api.filter

Class FilterIsNull

java.lang.Object

io.deephaven.api.filter.FilterBase

io.deephaven.api.filter.FilterIsNull

All Implemented Interfaces:

Expression, Filter

@Immutable
public abstract class FilterIsNull
extends FilterBase

Evaluates to true when the given expression evaluates to null.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.api.filter.Filter

Filter.Visitor<T>

Constructor Summary

Constructors

Constructor	Description
FilterIsNull()

Method Summary

Modifier and Type	Method	Description
abstract Expression	expression()	The expression.
final FilterNot<FilterIsNull>	invert()	The logical inversion of this.
static FilterIsNull	of(Expression expression)
final <T> T	walk(Filter.Visitor<T> visitor)

Methods inherited from class io.deephaven.api.filter.FilterBase

walk

Methods inherited from class java.lang.Object

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

Constructor Details

FilterIsNull

public FilterIsNull()

Method Details

of

public static FilterIsNull of(Expression expression)

expression

@Parameter
public abstract Expression expression()

The expression.

Returns:

the expression

invert

public final FilterNot<FilterIsNull> invert()

Description copied from interface: Filter

The logical inversion of this. While logically equivalent to Filter.not(this), implementations of this method will return more specifically typed inversions where applicable.

Returns:

the inverse filter

See Also:

• Filter.not(Filter)

walk

public final <T> T walk(Filter.Visitor<T> visitor)