Module xyz.ronella.casual.trivial

Package xyz.ronella.trivial.handy

Class NPESilencer<TYPE_ROOT_OBJECT,TYPE_OUTPUT>

java.lang.Object

xyz.ronella.trivial.handy.NPESilencer<TYPE_ROOT_OBJECT,TYPE_OUTPUT>

Type Parameters:

TYPE_ROOT_OBJECT - The type of the root object of the expression.

TYPE_OUTPUT - The type of output that the expression will produce.

public final class NPESilencer<TYPE_ROOT_OBJECT,TYPE_OUTPUT>
extends Object

A handy class for silencing the NPE. This means if it detects a NPE was thrown from the expression then the overall expression will be null.

Since:

2.3.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NPESilencer.NPESilencerBuilder<TYPE_ROOT_OBJECT,TYPE_OUTPUT>	The only class that can create NPESilencer.

Method Summary

Modifier and Type	Method	Description
TYPE_OUTPUT	evaluate()	Evaluate all the expressions and detecting NPE.
static <TYPE_ROOT_OBJECT, TYPE_OUTPUT> NPESilencer.NPESilencerBuilder<TYPE_ROOT_OBJECT,TYPE_OUTPUT>	getBuilder()	Creates the builder of the NPESilencer.
static <TYPE_OUTPUT> TYPE_OUTPUT	nullable(Supplier expression)	A convenience method for evaluating a single expression (i.e.

Methods inherited from class java.lang.Object

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

Method Details

getBuilder

public static <TYPE_ROOT_OBJECT,
TYPE_OUTPUT>
NPESilencer.NPESilencerBuilder<TYPE_ROOT_OBJECT,TYPE_OUTPUT> getBuilder()

Creates the builder of the NPESilencer.

Type Parameters:

TYPE_ROOT_OBJECT - The type of the root object of the expression.

TYPE_OUTPUT - The type of output that the expression will produce.

Returns:

An instance of NPESilencerBuilder

evaluate

public TYPE_OUTPUT evaluate()

Evaluate all the expressions and detecting NPE.

Returns:

The desired output of the last expression.

nullable

public static <TYPE_OUTPUT> TYPE_OUTPUT nullable(Supplier expression)

A convenience method for evaluating a single expression (i.e. the complexity of the expression depends on how you construct it) that potentially throws an NPE.

Type Parameters:

TYPE_OUTPUT - The output expression.

Parameters:

expression - An expression that can potentially throws an NPE

Returns:

The output of the expression.