org.nerd4j.utils.lang

Class IsNot

java.lang.Object

org.nerd4j.utils.lang.IsNot

public class IsNot
extends Object

This class consists of static utility methods intended to operate boolean checks on objects.

This class provides null-safe operations for the most common checks over Objects, Strings, Collections Maps, arrays and objects that implement the Emptily interface.

The main aim of this class is to provide an easy and readable way to perform the most common checks in conditional statements and in functional statements like those provided by Stream and Optional.

• NULL - checks if an Object is NOT null
• empty - checks if a String, a Collection, a Map, an array or an implementation of the Emptily interface is NOT empty
• blank - checks if a String does NOT contain only characters satisfying Character.isWhitespace(char)

This utility class can be used in if statements like:

  if( IsNot.empty(collection) )
    // Do something

  if( IsNot.blank(string) )
    // Do something
 

or can be used as Predicates in statements like:

  collection.stream().filter( IsNot::NULL ).// Do something

  or

  optional.filter( IsNot::blank ).// Do something
 

Since:

2.0.0

Author:

Massimo Coluzzi

Method Summary

Modifier and Type	Method and Description
static boolean	blank(String value) Checks if the given value is not null, nor empty and contains characters that do not satisfy the check performed by Character.isWhitespace(char).
static boolean	empty(boolean[] value) Checks if the given value is not null nor empty.
static boolean	empty(byte[] value) Checks if the given value is not null nor empty.
static boolean	empty(char[] value) Checks if the given value is not null nor empty.
static boolean	empty(Collection<?> value) Checks if the given value is not null nor empty.
static boolean	empty(double[] value) Checks if the given value is not null nor empty.
static boolean	empty(Emptily value) Checks if the given value is not null nor empty.
static boolean	empty(float[] value) Checks if the given value is not null nor empty.
static boolean	empty(int[] value) Checks if the given value is not null nor empty.
static boolean	empty(long[] value) Checks if the given value is not null nor empty.
static boolean	empty(Map<?,?> value) Checks if the given value is not null nor empty.
static boolean	empty(short[] value) Checks if the given value is not null nor empty.
static boolean	empty(String value) Checks if the given value is not null nor empty.
static <V> boolean	empty(V[] value) Checks if the given value is not null nor empty.
static boolean	NULL(Object value) Checks if the given value is not null.

Methods inherited from class java.lang.Object

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

Method Detail

NULL

public static boolean NULL(Object value)

Checks if the given value is not null.

Since null is a keyword and therefore cannot be used as a method name, we choose to name the method in upper case.

Parameters:

value - the value to check.

Returns:

false if the value is null.

empty

public static boolean empty(Emptily value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(String value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

blank

public static boolean blank(String value)

Checks if the given value is not null, nor empty and contains characters that do not satisfy the check performed by Character.isWhitespace(char).

Parameters:

value - the value to check.

Returns:

false if the value is null, empty or contains only white spaces.

empty

public static boolean empty(Collection<?> value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(Map<?,?> value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static <V> boolean empty(V[] value)

Checks if the given value is not null nor empty.

Type Parameters:

V - type of the elements in the array.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(boolean[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(char[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(byte[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(short[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(int[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(float[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(long[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.

empty

public static boolean empty(double[] value)

Checks if the given value is not null nor empty.

Parameters:

value - the value to check.

Returns:

false if the value is null or empty.