OptionalDO (Ezio Mobile SDK API Documentation (5.0.0))

java.lang.Object
- com.gemalto.idp.mobile.qr.emv.OptionalDO<T>

```
public final class OptionalDO<T>
extends java.lang.Object
```
Subset implementation of Optional class from Java 8

Since:

5.0

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> OptionalDO<T>`	`empty()` Returns an empty `OptionalDO` instance.
`T`	`get()` Returns the value if present, otherwise throws `NoSuchElementException`.
`boolean`	`isPresent()` Returns `true` if present, otherwise `false`.
`static <T> OptionalDO<T>`	`of(T value)` Returns an `OptionalDO` describing the given non-`null` value.
`static <T> OptionalDO<T>`	`ofNullable(T value)` Returns an `OptionalDO` describing the given value, if non-`null`, otherwise returns an empty `OptionalDO`.
`T`	`orElse(T other)` Returns the value if present, otherwise returns `other`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - empty
```
public static <T> OptionalDO<T> empty()
```
    Returns an empty OptionalDO instance. No value is present for this OptionalDO.
    
    Type Parameters:
    
    T - The type of the non-existent value
    
    Returns:
    
    an empty OptionalDO
  - of
```
public static <T> OptionalDO<T> of(T value)
```
    Returns an OptionalDO describing the given non-null value.
    
    Type Parameters:
    
    T - the type of the value
    
    Parameters:
    
    value - the value to describe, which must be non-null
    
    Returns:
    
    an OptionalDO with the value present
    
    Throws:
    
    java.lang.NullPointerException - if value is null
  - ofNullable
```
public static <T> OptionalDO<T> ofNullable(T value)
```
    Returns an OptionalDO describing the given value, if non-null, otherwise returns an empty OptionalDO.
    
    Type Parameters:
    
    T - the type of the value
    
    Parameters:
    
    value - the possibly-null value to describe
    
    Returns:
    
    an OptionalDO with a present value if the specified value is non-null, otherwise an empty OptionalDO
  - get
```
public T get()
```
    Returns the value if present, otherwise throws NoSuchElementException.
    
    Returns:
    
    the non-null value described by this OptionalDO
    
    Throws:
    
    java.util.NoSuchElementException - if no value is present
    
    See Also:
    
    isPresent()
  - isPresent
```
public boolean isPresent()
```
    Returns true if present, otherwise false.
    
    Returns:
    
    true if a value is present, otherwise false
  - orElse
```
public T orElse(T other)
```
    Returns the value if present, otherwise returns other.
    
    Parameters:
    
    other - the value to be returned, if no value is present. May be null.
    
    Returns:
    
    the value, if present, otherwise other

Class OptionalDO<T>

Method Summary

Methods inherited from class java.lang.Object

Method Detail

empty

of

ofNullable

get

isPresent

orElse