de.javagl.jgltf.model

Class Optionals

java.lang.Object

de.javagl.jgltf.model.Optionals

public class Optionals
extends java.lang.Object

Utility methods related to values that are optional. These values may be null, and the utility methods will provide default values in this case.

Method Summary

Modifier and Type	Method and Description
static <T> T	get(java.util.List<T> list, int index) Returns the specified element from the given list, or null if the list is null or the index is not valid.
static <V> V	get(java.lang.Object key, java.util.Map<?,V> map) Returns the value that is associated with the given key in the given map, or null if either the key or the map is null.
static <T> java.util.List<T>	of(java.util.List<T> list) Returns the given list, or an unmodifiable empty list if the given list is null.
static <K,V> java.util.Map<K,V>	of(java.util.Map<K,V> map) Returns the given map, or an unmodifiable empty map if the given map is null.
static <T> T	of(T value, T defaultValue) Returns the given value, or the default value if the given value is null.

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <T> java.util.List<T> of(java.util.List<T> list)

Returns the given list, or an unmodifiable empty list if the given list is null.

Type Parameters:

T - The element type

Parameters:

list - The list

Returns:

The result

get

public static <T> T get(java.util.List<T> list,
                        int index)

Returns the specified element from the given list, or null if the list is null or the index is not valid.

Type Parameters:

T - The element type

Parameters:

list - The list

index - The index

Returns:

The element

of

public static <K,V> java.util.Map<K,V> of(java.util.Map<K,V> map)

Returns the given map, or an unmodifiable empty map if the given map is null.

Type Parameters:

K - The key type

V - The value type

Parameters:

map - The map

Returns:

The result

of

public static <T> T of(T value,
                       T defaultValue)

Returns the given value, or the default value if the given value is null.

Type Parameters:

T - The value type

Parameters:

value - The value

defaultValue - The default value

Returns:

The result

get

public static <V> V get(java.lang.Object key,
                        java.util.Map<?,V> map)

Returns the value that is associated with the given key in the given map, or null if either the key or the map is null.

Type Parameters:

V - The value type

Parameters:

key - The key

map - The map

Returns:

The value