com.apollographql.apollo.api

Class Input<V>

java.lang.Object

com.apollographql.apollo.api.Input<V>

Type Parameters:

V - the type of instance that can be contained

public final class Input<V>
extends java.lang.Object

An immutable object that wraps reference to another object. Reference can be in two states: defined means reference to another object is set explicitly and undefined means reference is not set.
It provides a convenience way to distinguish the case when value is provided explicitly and should be serialized (even if it's null) and the case when value is undefined (means it won't be serialized).

Field Summary

Fields

Modifier and Type	Field and Description
boolean	defined
V	value

Method Summary

Modifier and Type	Method and Description
static <V> Input<V>	absent() Creates a new Input instance that is always undefined.
static <V> Input<V>	fromNullable(V value) Creates a new Input instance that is always defined.
static <V> Input<V>	optional(V value) Creates a new Input instance that is defined in case if value is not-null and undefined otherwise.

Methods inherited from class java.lang.Object

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

Field Detail

value

public final V value

defined

public final boolean defined

Method Detail

optional

public static <V> Input<V> optional(@Nullable
                                    V value)

Creates a new Input instance that is defined in case if value is not-null and undefined otherwise.

Parameters:

value - to be wrapped

Returns:

a new Input instance

fromNullable

public static <V> Input<V> fromNullable(@Nullable
                                        V value)

Creates a new Input instance that is always defined.

Parameters:

value - to be wrapped

Returns:

a new Input instance

absent

public static <V> Input<V> absent()

Creates a new Input instance that is always undefined.

Parameters:

value - to be wrapped

Returns:

a new Input instance