org.jowidgets.util.maybe

Interface IMaybe<TYPE>

Type Parameters:

TYPE - the type of the maybe's value

All Known Implementing Classes:

Some

public interface IMaybe<TYPE>

An Object of the type TYPE that can be defined, that can be null (undefined) or that can be nothing (not even undefined). This can be used e.g. if a value is not available, e.g. when a user input was aborted

Method Summary

Methods

Modifier and Type	Method and Description
TYPE	getValue()
TYPE	getValueOrElse(TYPE defaultValue) Gets the value of the maybe, if the maybe is not nothing, else the default is returned
boolean	isNothing()
boolean	isSomething()

Method Detail

getValue

TYPE getValue()

Returns:

The value of the maybe

isNothing

boolean isNothing()

Returns:

true if the maybe is nothing, not even undefined Remark: isSomething() == true implies isNothing() == false and vice versa.

isSomething

boolean isSomething()

Returns:

true, if the maybe is something. Remark: isSomething() == true implies isNothing() == false and vice versa.

getValueOrElse

TYPE getValueOrElse(TYPE defaultValue)

Gets the value of the maybe, if the maybe is not nothing, else the default is returned

Parameters:

defaultValue - the default value

Returns:

the value if the maybe is not nothing and else the default