org.jooby.util

Class Switch<In,Out>

java.lang.Object

org.jooby.util.Switch<In,Out>

Type Parameters:

In - Input type.

Out - Output type.

public class Switch<In,Out>
extends Object

A programmatic switch:

   String var = ...;
   Out out = Switch.newSwitch(var)
    .when("A", ()  -> doA())
    .when("B", ()  -> doB())
    .value();
 

Author:

edgar

Method Summary

Modifier and Type	Method and Description
static <In,Out> Switch<In,Out>	newSwitch(In value) Creates a new switch.
static <Out> Switch<String,Out>	newSwitch(String value) Creates a new string switch.
Optional<Out>	value() Test all the switches and find the first who best matches the input value.
Switch<In,Out>	when(In value, ExSupplier<Out> fn) Append a new option.
Switch<In,Out>	when(In value, Out result) Append a new option.
Switch<In,Out>	when(Predicate<In> predicate, ExSupplier<Out> fn) Append a new option.
Switch<In,Out>	when(Predicate<In> predicate, Out result) Append a new option.

Methods inherited from class java.lang.Object

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

Method Detail

when

public Switch<In,Out> when(In value,
                           Out result)

Append a new option.

Parameters:

value - A value to test.

result - A constant value.

Returns:

This switch.

when

public Switch<In,Out> when(Predicate<In> predicate,
                           Out result)

Append a new option.

Parameters:

predicate - A predicate to test.

result - A constant value.

Returns:

This switch.

when

public Switch<In,Out> when(In value,
                           ExSupplier<Out> fn)

Append a new option.

Parameters:

value - A value to test.

fn - A result supplier value.

Returns:

This switch.

when

public Switch<In,Out> when(Predicate<In> predicate,
                           ExSupplier<Out> fn)

Append a new option.

Parameters:

predicate - A predicate to test.

fn - A result supplier value.

Returns:

This switch.

value

public Optional<Out> value()
                    throws Exception

Test all the switches and find the first who best matches the input value.

Returns:

A value or empty optional.

Throws:

Exception - If something goes wrong.

newSwitch

public static <In,Out> Switch<In,Out> newSwitch(In value)

Creates a new switch.

Type Parameters:

In - Input value.

Out - Output value.

Parameters:

value - An input value.

Returns:

A new switch.

newSwitch

public static <Out> Switch<String,Out> newSwitch(String value)

Creates a new string switch.

Type Parameters:

Out - Output value.

Parameters:

value - An input value.

Returns:

A new switch.