BlobStore.OptionalOrUnknown (Nuxeo 2021.53.3 API Documentation)

java.lang.Object
- org.nuxeo.ecm.core.blob.BlobStore.OptionalOrUnknown<T>

Enclosing interface:

BlobStore
```
public static class BlobStore.OptionalOrUnknown<T>
extends Object
```
A class representing an unknown value, a missing value, or a present (non-null) value.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`
`T`	`get()`	Returns the value if it is present, otherwise throws `NoSuchElementException`.
`int`	`hashCode()`
`boolean`	`isKnown()`	Returns `true` if the value is known (missing or present), otherwise `false`.
`boolean`	`isMissing()`	Returns `true` if the value is missing, otherwise `false`.
`boolean`	`isPresent()`	Returns `true` if the value is present, otherwise `false`.
`boolean`	`isUnknown()`	Returns `true` if the value is unknown, otherwise `false`.
`static <T> BlobStore.OptionalOrUnknown<T>`	`missing()`	Returns a missing instance.
`static <T> BlobStore.OptionalOrUnknown<T>`	`of(T value)`	Returns an instance of a present, non-null value.
`static <T> BlobStore.OptionalOrUnknown<T>`	`unknown()`	Returns an unknown instance.

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

- Method Detail
  - unknown
```
public static <T> BlobStore.OptionalOrUnknown<T> unknown()
```
    Returns an unknown instance.
  - missing
```
public static <T> BlobStore.OptionalOrUnknown<T> missing()
```
    Returns a missing instance.
  - of
```
public static <T> BlobStore.OptionalOrUnknown<T> of(T value)
```
    Returns an instance of a present, non-null value.
  - isUnknown
```
public boolean isUnknown()
```
    Returns true if the value is unknown, otherwise false.
  - isKnown
```
public boolean isKnown()
```
    Returns true if the value is known (missing or present), otherwise false.
  - isPresent
```
public boolean isPresent()
```
    Returns true if the value is present, otherwise false.
  - isMissing
```
public boolean isMissing()
```
    Returns true if the value is missing, otherwise false.
  - get
```
@NotNull
public T get()
```
    Returns the value if it is present, otherwise throws NoSuchElementException.
    
    Throws:
    
    NoSuchElementException - if there is no value present
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object