public class CollectionUtils extends Object
Utility methods for working with Collection
types
Constructor and Description |
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CollectionUtils() |
Modifier and Type | Method and Description |
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static <T> Optional<Iterable<T>> |
convertCollection(Class<? extends Iterable<T>> iterableType,
Collection<T> collection)
Attempts to convert a collection to the given iterabable type
|
static <T> Iterable<T> |
enumerationToIterable(Enumeration<T> enumeration)
Convert an
Enumeration to a Iterable . |
static <T> Set<T> |
enumerationToSet(Enumeration<T> enumeration)
Convert an
Enumeration to a Set . |
static boolean |
isEmpty(Collection collection)
Null safe empty check.
|
static boolean |
isEmpty(Map map)
Null safe empty check.
|
static boolean |
isNotEmpty(Collection collection)
Null safe not empty check.
|
static boolean |
isNotEmpty(Map map)
Null safe not empty check.
|
static <T> List<T> |
iterableToList(Iterable<T> iterable)
|
static <T> Set<T> |
iterableToSet(Iterable<T> iterable)
|
static <T> Set<T> |
iteratorToSet(Iterator<T> iterator)
|
static Map |
mapOf(Object... values)
Create a
LinkedHashMap from an array of values. |
static <T> Set<T> |
setOf(T... objects)
Creates a set of the given objects.
|
static String |
toString(Iterable<?> iterable)
Produce a string representation of the given iterable.
|
static String |
toString(String delimiter,
Iterable<?> iterable)
Produce a string representation of the given iterable.
|
static <T> List<T> |
unmodifiableList(List<T> list)
Null safe version of
Collections.unmodifiableList(List) . |
public static boolean isEmpty(@Nullable Map map)
map
- The mappublic static boolean isNotEmpty(@Nullable Map map)
map
- The ,appublic static boolean isEmpty(@Nullable Collection collection)
collection
- The collectionpublic static boolean isNotEmpty(@Nullable Collection collection)
collection
- The collectionpublic static <T> Optional<Iterable<T>> convertCollection(Class<? extends Iterable<T>> iterableType, Collection<T> collection)
Attempts to convert a collection to the given iterabable type
.T
- The collection generic typeiterableType
- The iterable typecollection
- The collectionOptional
of the converted typepublic static Map mapOf(Object... values)
LinkedHashMap
from an array of values.values
- The valuespublic static <T> Set<T> iteratorToSet(Iterator<T> iterator)
T
- The typeiterator
- The iteratorpublic static <T> Set<T> enumerationToSet(Enumeration<T> enumeration)
Enumeration
to a Set
.T
- The typeenumeration
- The iterator@Nonnull public static <T> Iterable<T> enumerationToIterable(@Nullable Enumeration<T> enumeration)
Enumeration
to a Iterable
.T
- The typeenumeration
- The iteratorpublic static <T> Set<T> setOf(T... objects)
T
- The typeobjects
- The objectspublic static String toString(Iterable<?> iterable)
iterable
- The iterablepublic static String toString(String delimiter, Iterable<?> iterable)
delimiter
- The delimiteriterable
- The iterablepublic static <T> List<T> iterableToList(Iterable<T> iterable)
T
- The generic typeiterable
- The iterablepublic static <T> Set<T> iterableToSet(Iterable<T> iterable)
T
- The generic typeiterable
- The iterable@Nonnull public static <T> List<T> unmodifiableList(@Nullable List<T> list)
Collections.unmodifiableList(List)
.T
- The generic typelist
- The list