Null (BandM metatools API doc)

java.lang.Object

eu.bandm.tools.ops.Null

public abstract class Null extends Object

An abstract class that has no instances, and only the null reference.

Method Summary

Modifier and Type

Method

Description

static <A> A

check(A x)

Deprecated.
Use Objects.requireNonNull(Object) instead.

static <A> A

check(A x, String msg)

Deprecated.
Use Objects.requireNonNull(Object, String) instead.

static <A> A

check(String name, A x)

Deprecated.
Use Objects.requireNonNull(Object, String) instead.

static <A> boolean

equals(A x, A y)

Deprecated.
Use Objects.equals(java.lang.Object, java.lang.Object) instead.

static int

hashCode(Object x)

Deprecated.
Use Objects.hashCode(java.lang.Object) instead.

static <A, B> Function<A,B>

lift(Function<A,B> fun)

Deprecated.
use Functions.strict(Function)

static <A, B extends A, C extends A> A

orElse(B first, C second)

Deprecated.
use Objects.requireNonNullElse(Object, Object)

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

Method Details
- equals
  
  public static <A> boolean equals(A x, A y)
  
  Deprecated.
  Use Objects.equals(java.lang.Object, java.lang.Object) instead.
- hashCode
  
  public static int hashCode(Object x)
  
  Deprecated.
  Use Objects.hashCode(java.lang.Object) instead.
- check
  
  public static <A> A check(A x)
  
  Deprecated.
  Use Objects.requireNonNull(Object) instead.
- check
  
  public static <A> A check(A x, String msg)
  
  Deprecated.
  Use Objects.requireNonNull(Object, String) instead.
- check
  
  public static <A> A check(String name, A x)
  
  Deprecated.
  Use Objects.requireNonNull(Object, String) instead.
- lift
  
  @Deprecated public static <A, B> Function<A,B> lift(Function<A,B> fun)
  
  Deprecated.
  use Functions.strict(Function)
  
  Returns a variant of the given function that handles null arguments.
  
  Parameters:
  
  fun - a function
  
  Returns:
  
  a function that computes the same results as fun, but returns null immediately when applied to null.
  
  Throws:
  
  NullPointerException - if fun == null.
- orElse
  
  @Deprecated public static <A, B extends A, C extends A> A orElse(B first, C second)
  
  Deprecated.
  use Objects.requireNonNullElse(Object, Object)
  
  Returns the second value iff the first is null.