org.springframework.data.gemfire.util

Class CollectionUtils

java.lang.Object

org.springframework.util.CollectionUtils

org.springframework.data.gemfire.util.CollectionUtils

public abstract class CollectionUtils
extends CollectionUtils

The CollectionUtils class is a utility class for working with Java Collections Framework and classes.

Since:

1.7.0

See Also:

Collection, Collections, CollectionUtils

Constructor Summary

Constructors

Constructor and Description
CollectionUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Iterable<T>	iterable(Enumeration<T> enumeration) Adapts the given Enumeration as an Iterable object for use within a for each loop.
static <T> Iterable<T>	iterable(Iterator<T> iterator) Adapts the given Iterator as an Iterable object for use within a for each loop.
static <T> Collection<T>	nullSafeCollection(Collection<T> collection) A null-safe operation returning the original Collection if non-null or an empty Collection (implemented with List) if null.
static <T> Iterable<T>	nullSafeIterable(Iterable<T> iterable) A null-safe operation returning the original Iterable object if non-null or a default, empty Iterable implementation if null.

Methods inherited from class org.springframework.util.CollectionUtils

arrayToList, contains, contains, containsAny, containsInstance, findCommonElementType, findFirstMatch, findValueOfType, findValueOfType, hasUniqueObject, isEmpty, isEmpty, mergeArrayIntoCollection, mergePropertiesIntoMap, toArray, toIterator, toMultiValueMap, unmodifiableMultiValueMap

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

iterable

public static <T> Iterable<T> iterable(Enumeration<T> enumeration)

Adapts the given Enumeration as an Iterable object for use within a for each loop.

Type Parameters:

T - the class type of the Enumeration elements.

Parameters:

enumeration - the Enumeration to adapt as an Iterable object.

Returns:

an Iterable instance of the Enumeration.

See Also:

Iterable, Enumeration

iterable

public static <T> Iterable<T> iterable(Iterator<T> iterator)

Adapts the given Iterator as an Iterable object for use within a for each loop.

Type Parameters:

T - the class type of the Iterator elements.

Parameters:

iterator - the Iterator to adapt as an Iterable object.

Returns:

an Iterable instance of the Iterator.

See Also:

Iterable, Iterator

nullSafeCollection

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

A null-safe operation returning the original Collection if non-null or an empty Collection (implemented with List) if null.

Type Parameters:

T - the element class type of the Collection.

Parameters:

collection - the Collection to evaluate for being null.

Returns:

the given Collection if not null, otherwise return an empty Collection (List).

See Also:

Collections.emptyList()

nullSafeIterable

public static <T> Iterable<T> nullSafeIterable(Iterable<T> iterable)

A null-safe operation returning the original Iterable object if non-null or a default, empty Iterable implementation if null.

Type Parameters:

T - the class type of the iterable elements.

Parameters:

iterable - the Iterable object evaluated for a null reference.

Returns:

the Iterable object if not null or a default, empty Iterable implementation otherwise.

See Also:

Iterable, Iterator