Package com.totvs.tjf.core.common

Class CollectionUtils

java.lang.Object

com.totvs.tjf.core.common.CollectionUtils

public final class CollectionUtils
extends Object

This class consists exclusively of static methods, with null safe parameters, that operate on, or return, collections.

Author:

Thiago A. de Souza Weber

See Also:

Collection, Set, List, Map, Arrays

Method Summary

Modifier and Type	Method	Description
static <T> List<T>	arrayListNullabeSafe(List<T> list)	Null safe implementation for a ArrayList.
static <T> Set<T>	hashSetNullableSafe(Set<T> set)	Null safe implementation for a HashSet.
static <T> Collection<T>	unmodifiable(Collection<T> collection)	Null safe implementation for unmodifiableCollection.
static <T> List<T>	unmodifiable(List<T> collection)	Null safe implementation for unmodifiableList.
static <K,V> Map<K,V>	unmodifiable(Map<K,V> map)	Null safe implementation for unmodifiableMap.
static <T> Set<T>	unmodifiable(Set<T> collection)	Null safe implementation for unmodifiableSet.
static <T> List<T>	unmodifiable(T[] array)	Null safe implementation for unmodifiableList.

Methods inherited from class java.lang.Object

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

Method Detail

unmodifiable

public static <T> Collection<T> unmodifiable(Collection<T> collection)

Null safe implementation for unmodifiableCollection.

Parameters:

collection - for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified collection

See Also:

Collections.emptyList(), Collections.unmodifiableCollection(java.util.Collection<? extends T>)

unmodifiable

public static <T> List<T> unmodifiable(List<T> collection)

Null safe implementation for unmodifiableList.

Parameters:

collection - the list for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified list

See Also:

Collections.emptyList(), Collections.unmodifiableList(java.util.List<? extends T>)

unmodifiable

public static <T> Set<T> unmodifiable(Set<T> collection)

Null safe implementation for unmodifiableSet.

Parameters:

collection - the set for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified set

See Also:

Collections.emptySet(), Collections.unmodifiableSet(java.util.Set<? extends T>)

unmodifiable

public static <K,V> Map<K,V> unmodifiable(Map<K,V> map)

Null safe implementation for unmodifiableMap.

Parameters:

map - the map for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified map

See Also:

Collections.emptyMap(), Collections.unmodifiableMap(java.util.Map<? extends K, ? extends V>)

unmodifiable

public static <T> List<T> unmodifiable(T[] array)

Null safe implementation for unmodifiableList.

Parameters:

array - for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified list

See Also:

Collections.emptyList(), Collections.unmodifiableList(java.util.List<? extends T>)

arrayListNullabeSafe

public static <T> List<T> arrayListNullabeSafe(List<T> list)

Null safe implementation for a ArrayList.

Type Parameters:

T - list type

Parameters:

list - list that will be verified

Returns:

a new ArrayList if the list is null

hashSetNullableSafe

public static <T> Set<T> hashSetNullableSafe(Set<T> set)

Null safe implementation for a HashSet.

Type Parameters:

T - set type

Parameters:

set - set that will be verified

Returns:

a new HashSet if the list is null