Is (Nerd4j Utils 2.0.0 API)

java.lang.Object
- org.nerd4j.utils.lang.Is

```
public class Is
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 null
- empty - checks if a String, a Collection, a Map, an array or an implementation of the Emptily interface is empty
- blank - checks if a String contains only characters satisfying Character.isWhitespace(char)
This utility class can be used in if statements like:
```
  if( Is.empty(collection) )
    // Do something

  if( Is.blank(string) )
    // Do something
 
```
or can be used as Predicates in statements like:
```
  collection.stream().filter( Is::NULL ) // Do something

  or

  optional.filter( Is::blank ) // Do something
 
```
Since:

2.0.0

Author:

Massimo Coluzzi

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`blank(String value)` Checks if the given value is `null`, empty or contains only characters that satisfies the check performed by `Character.isWhitespace(char)`.
`static boolean`	`empty(boolean[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(byte[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(char[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(Collection<?> value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(double[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(Emptily value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(float[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(int[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(long[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(Map<?,?> value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(short[] value)` Checks if the given value is `null` or empty.
`static boolean`	`empty(String value)` Checks if the given value is `null` or empty.
`static <V> boolean`	`empty(V[] value)` Checks if the given value is `null` or empty.
`static boolean`	`NULL(Object value)` Checks 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
  - NULL
```
public static boolean NULL(Object value)
```
    Checks if the given value is 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:
    
    true if the value is null.
  - empty
```
public static boolean empty(Emptily value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(String value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - blank
```
public static boolean blank(String value)
```
    Checks if the given value is null, empty or contains only characters that satisfies the check performed by Character.isWhitespace(char).
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null, empty or contains only white spaces.
  - empty
```
public static boolean empty(Collection<?> value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(Map<?,?> value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static <V> boolean empty(V[] value)
```
    Checks if the given value is null or empty.
    
    Type Parameters:
    
    V - type of the elements in the array.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(boolean[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(char[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(byte[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(short[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(int[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(float[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(long[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.
  - empty
```
public static boolean empty(double[] value)
```
    Checks if the given value is null or empty.
    
    Parameters:
    
    value - the value to check.
    
    Returns:
    
    true if the value is null or empty.

Class Is

Method Summary

Methods inherited from class java.lang.Object

Method Detail

NULL

empty

empty

blank

empty

empty

empty

empty

empty

empty

empty

empty

empty

empty

empty