Package org.apache.sis.filter

Class UnaryFunction.IsNil<R>

java.lang.Object

org.apache.sis.internal.filter.Node

org.apache.sis.filter.UnaryFunction<R,Object>

org.apache.sis.filter.UnaryFunction.IsNil<R>

Type Parameters:

R - the type of resources used as inputs.

All Implemented Interfaces:

Serializable, Predicate<R>, Filter<R>, Optimization.OnFilter<R>

Enclosing class:

UnaryFunction<R,V>

static final class UnaryFunction.IsNil<R>
extends UnaryFunction<R,Object>
implements Filter<R>, Optimization.OnFilter<R>

Filter operator that checks if an expression's value is nil. The difference with UnaryFunction.IsNull is that a value should exist but cannot be provided for the reason given by getNilReason().

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sis.filter.UnaryFunction

UnaryFunction.IsNil<R>, UnaryFunction.IsNull<R>

Field Summary

Fields

Modifier and Type	Field	Description
private final String	nilReason	The reason why the value is nil, or null for accepting any reason.
private static final long	serialVersionUID	For cross-version compatibility.

Fields inherited from class org.apache.sis.filter.UnaryFunction

expression

Constructor Summary

Constructors

Constructor	Description
IsNil(Expression<? super R,?> expression, String nilReason)	Creates a new operator.

Method Summary

Modifier and Type	Method	Description
Optional<String>	getNilReason()	Returns the reason why the value is nil.
ComparisonOperatorName	getOperatorType()	Returns the nature of the operator.
Filter<R>	recreate(Expression<? super R,?>[] effective)	Creates a new filter of the same type but different parameters.
boolean	test(R object)	Evaluate this filter on the given object.

Methods inherited from class org.apache.sis.filter.UnaryFunction

getChildren, getExpressions, getParameters

Methods inherited from class org.apache.sis.internal.filter.Node

createName, createType, equals, getGeometryLibrary, hashCode, symbol, toGeometryWrapper, toString, unwrap, warning

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.sis.filter.Filter

getExpressions

Methods inherited from interface org.apache.sis.filter.Optimization.OnFilter

and, negate, optimize, or

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

nilReason

private final String nilReason

The reason why the value is nil, or null for accepting any reason.

Constructor Details

IsNil

IsNil(Expression<? super R,?> expression,
 String nilReason)

Creates a new operator.

Method Details

getOperatorType

public ComparisonOperatorName getOperatorType()

Description copied from interface: Filter

Returns the nature of the operator.

Specified by:

getOperatorType in interface Filter<R>

Returns:

the nature of this operator.

recreate

public Filter<R> recreate(Expression<? super R,?>[] effective)

Creates a new filter of the same type but different parameters.

Specified by:

recreate in interface Optimization.OnFilter<R>

Parameters:

effective - the expressions to use as a replacement of this filter expressions.

Returns:

the new filter, or this if unsupported.

getNilReason

public Optional<String> getNilReason()

Returns the reason why the value is nil.

test

public boolean test(R object)

Evaluate this filter on the given object.

Specified by:

test in interface Filter<R>

Specified by:

test in interface Predicate<R>

Parameters:

object - the object (often a Feature instance) to evaluate.

Returns:

true if the test(s) are passed for the provided object.