it.techgap.common.utils

Class When

java.lang.Object

it.techgap.common.utils.When

public class When
extends Object

Class implementing a Kolin-like when structure, which execute some code when a condition is true

Constructor Summary

Constructors

Constructor and Description
When()

Method Summary

Modifier and Type	Method and Description
static <T> T	multiWhen(Object... results) Execute multiple when(java.lang.Boolean, it.techgap.common.utils.WhenLambda, java.lang.Object...) and returns the first value that isn't null.
static <T> T	when(Boolean expression, WhenLambda lambda) Evaluate a new condition that doesn't need any parameter
static <T> T	when(Boolean expression, WhenLambda lambda, Object... lambdaParams) Evaluate a new condition

Methods inherited from class java.lang.Object

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

Constructor Detail

When

public When()

Method Detail

when

public static <T> T when(Boolean expression,
                         WhenLambda lambda,
                         Object... lambdaParams)

Evaluate a new condition

Type Parameters:

T - Return type of the method

Parameters:

expression - boolean condition that triggers the lambda execution

lambda - code to run when the condition is true

lambdaParams - parameters that can be passed to the WhenLambda

Returns:

the return object of WhenLambda.execute(java.lang.Object...), or null if the expression is falsey

when

public static <T> T when(Boolean expression,
                         WhenLambda lambda)

Evaluate a new condition that doesn't need any parameter

Type Parameters:

T - Return type of the method

Parameters:

expression - boolean condition that triggers the lambda execution

lambda - code to run when the condition is true

Returns:

the return object of WhenLambda.execute(java.lang.Object...), or null if the expression is falsey

multiWhen

public static <T> T multiWhen(Object... results)

Execute multiple when(java.lang.Boolean, it.techgap.common.utils.WhenLambda, java.lang.Object...) and returns the first value that isn't null. Should be used with multiple mutually exclusive whens to execute the correct one based on a precise condition. Ideally, only one of the whens should return a non-null value at a time.

Type Parameters:

T - return type

Parameters:

results - outputs of multiple when(java.lang.Boolean, it.techgap.common.utils.WhenLambda, java.lang.Object...)

Returns:

the first non-null result value