com.speedment.runtime.compute.trait

Interface HasMapToDoubleIfPresent<T,MAPPER>

Type Parameters:

T - the input entity type

MAPPER - the functional interface used for mapping values

All Known Subinterfaces:

ToBooleanNullable<T>, ToByteNullable<T>, ToEnumNullable<T,E>, ToFloatNullable<T>, ToIntNullable<T>, ToLongNullable<T>, ToShortNullable<T>

public interface HasMapToDoubleIfPresent<T,MAPPER>

Trait for nullable expressions that can be mapped to a new expression of the same type by supplying a mapping function. If the value is present in the original expression, then it will be present in the new one as well. If the result of the original expression is null, then the new expression will evaluate to null also.

Since:

3.1.0

Author:

Emil Forslund

Method Summary

Modifier and Type	Method and Description
ToDoubleNullable<T>	mapToDoubleIfPresent(MAPPER mapper) Maps the result of this expression into a double by passing it to the specified mapper, producing a new expression that implements ToDouble.

Method Detail

mapToDoubleIfPresent

ToDoubleNullable<T> mapToDoubleIfPresent(MAPPER mapper)

Maps the result of this expression into a double by passing it to the specified mapper, producing a new expression that implements ToDouble. If this expression would have evaluated to null, then the new expression will as well.

Parameters:

mapper - the mapper to use on the result of this expression

Returns:

the new mapped expression