org.apache.hadoop.hbase.util

Class CollectionUtils

java.lang.Object

org.apache.hadoop.hbase.util.CollectionUtils

@InterfaceAudience.Private
public class CollectionUtils
extends Object

Utility methods for dealing with Collections, including treating null collections as empty.

Constructor Summary

Constructors

Constructor and Description
CollectionUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	getFirst(Collection<T> collection) first/last
static <T> T	getLast(List<T> list)
static int	getLastIndex(List<?> list)
static <T> boolean	isEmpty(Collection<T> collection) empty
static boolean	isLastIndex(List<?> list, int index)
static <T> boolean	notEmpty(Collection<T> collection)
static <T> Collection<T>	nullSafe(Collection<T> in)
static <A,B> boolean	nullSafeSameSize(Collection<A> a, Collection<B> b)
static <T> int	nullSafeSize(Collection<T> collection) size

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

nullSafe

public static <T> Collection<T> nullSafe(Collection<T> in)

nullSafeSize

public static <T> int nullSafeSize(Collection<T> collection)

size

nullSafeSameSize

public static <A,B> boolean nullSafeSameSize(Collection<A> a,
                             Collection<B> b)

isEmpty

public static <T> boolean isEmpty(Collection<T> collection)

empty

notEmpty

public static <T> boolean notEmpty(Collection<T> collection)

getFirst

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

first/last

getLastIndex

public static int getLastIndex(List<?> list)

Parameters:

list - any list

Returns:

-1 if list is empty, otherwise the max index

isLastIndex

public static boolean isLastIndex(List<?> list,
                  int index)

Parameters:

list -

index - the index in question

Returns:

true if it is the last index or if list is empty and -1 is passed for the index param

getLast

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