com.technia.tvc.core.util

Class CollectionUtils

java.lang.Object

com.technia.tvc.core.util.CollectionUtils

public final class CollectionUtils
extends java.lang.Object

Contains an empty iterator and an empty enumeration.

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.Enumeration	EMPTY_ENUMERATION An empty enumeration.

Method Summary

Methods

Modifier and Type	Method and Description
static <T,S extends T> void	addIfNotNull(java.util.List<T> target, S item) Adds the specified item to the target list if the item is non-null.
static <T> java.util.Enumeration<T>	emptyEnumeration() Returns a type safe empty enumeration
static <T> java.util.Collection<T>	emptyIfNull(java.util.Collection<T> source) Return empty collection when source is null
static <K,V> java.util.Map<K,V>	emptyIfNull(java.util.Map<K,V> source) Return empty Map when source is null
static boolean	isEmpty(java.util.Collection<?> c) Checks if a collection is empty (or null)
static boolean	isEmpty(java.util.Map<?,?> map) Checks if a Map is empty (or null)
static boolean	isNotEmpty(java.util.Collection<?> c) Checks if a collection is not empty (or not null)
static boolean	isNotEmpty(java.util.Map<?,?> map) Checks if a Map is not empty (or not null)
static <T> void	multiSort(T[] items, java.util.Collection<java.util.Comparator<T>> comparators) Sorts an array of items using one or more comparators.
static <T> java.util.Collection<T>	nullIfEmpty(java.util.Collection<T> source) Return null when source is null or empty
static <K,V> java.util.Map<K,V>	nullIfEmpty(java.util.Map<K,V> source) Return null when source is null or empty
static int	sizeOf(java.util.Collection<?> c)
static <T> T[]	toArray(java.util.Collection<? extends T> c, java.lang.Class<T> componentType)
static <T> java.util.Iterator<T>	unmodifiableIterator(java.util.Iterator<T> iterator)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ENUMERATION

public static final java.util.Enumeration EMPTY_ENUMERATION

An empty enumeration.

Method Detail

unmodifiableIterator

public static <T> java.util.Iterator<T> unmodifiableIterator(java.util.Iterator<T> iterator)

Parameters:

iterator - An iterator.

Returns:

An unmodifiable version of the specified iterator (i.e., the remove() method has been disabled).

toArray

public static <T> T[] toArray(java.util.Collection<? extends T> c,
              java.lang.Class<T> componentType)

Parameters:

c - A collection.

componentType - The array component type.

Returns:

The array.

Since:

5.2

isEmpty

public static boolean isEmpty(java.util.Collection<?> c)

Checks if a collection is empty (or null)

Parameters:

c - A collection

Returns:

True if the collection is null, or it is empty

Since:

6.3.0

isNotEmpty

public static boolean isNotEmpty(java.util.Collection<?> c)

Checks if a collection is not empty (or not null)

Parameters:

c - A collection

Returns:

True if the collection is contains items

Since:

2015.3.0

isEmpty

public static boolean isEmpty(java.util.Map<?,?> map)

Checks if a Map is empty (or null)

Parameters:

map - A Map

Returns:

True if the map is null, or it is empty

Since:

2015.3.0

isNotEmpty

public static boolean isNotEmpty(java.util.Map<?,?> map)

Checks if a Map is not empty (or not null)

Parameters:

map - A Map

Returns:

True if the map is contains items

Since:

2015.3.0

emptyEnumeration

public static <T> java.util.Enumeration<T> emptyEnumeration()

Returns a type safe empty enumeration

Since:

2010.1.0

sizeOf

public static int sizeOf(java.util.Collection<?> c)

multiSort

public static <T> void multiSort(T[] items,
                 java.util.Collection<java.util.Comparator<T>> comparators)

Sorts an array of items using one or more comparators.

Type Parameters:

T -

Parameters:

items -

comparators -

Since:

2011.2.0

addIfNotNull

public static <T,S extends T> void addIfNotNull(java.util.List<T> target,
                                S item)

Adds the specified item to the target list if the item is non-null.

Type Parameters:

T - Any type

S - An object derived from T

Parameters:

target - The target list

item - The item to be added

Since:

2012.1.0

emptyIfNull

public static <T> java.util.Collection<T> emptyIfNull(java.util.Collection<T> source)

Return empty collection when source is null

Parameters:

source - The Collection

Returns:

The empty collection if the parameter is null, otherwise the parameter.

Since:

2015.1.0

nullIfEmpty

public static <T> java.util.Collection<T> nullIfEmpty(java.util.Collection<T> source)

Return null when source is null or empty

Parameters:

source - The Collection

Returns:

The null if the parameter is null or empty

Since:

2015.3.0

emptyIfNull

public static <K,V> java.util.Map<K,V> emptyIfNull(java.util.Map<K,V> source)

Return empty Map when source is null

Parameters:

source - The Map

Returns:

The empty Map if the parameter is null, otherwise the parameter.

Since:

2015.3.0

nullIfEmpty

public static <K,V> java.util.Map<K,V> nullIfEmpty(java.util.Map<K,V> source)

Return null when source is null or empty

Parameters:

source - The Map

Returns:

The null if the parameter is null or empty

Since:

2015.3.0