Package org.apache.solr.common.util

Class CollectionUtil

java.lang.Object

org.apache.solr.common.util.CollectionUtil

public final class CollectionUtil
extends Object

Methods for creating collections with exact sizes, and other convenience methods

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Method Summary

Modifier and Type	Method	Description
static boolean	isEmpty(Collection<?> collection)
static boolean	isEmpty(Map<?,?> map)
static boolean	isNotEmpty(Collection<?> collection)
static boolean	isNotEmpty(Map<?,?> map)
static <K, V> HashMap<K,V>	newHashMap(int size)	Returns a new HashMap sized to contain size items without resizing the internal array.
static <E> HashSet<E>	newHashSet(int size)	Returns a new HashSet sized to contain size items without resizing the internal array.
static <K, V> LinkedHashMap<K,V>	newLinkedHashMap(int size)	Returns a new LinkedHashMap sized to contain size items without resizing the internal array.

Methods inherited from class java.lang.Object

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

Method Details

newHashMap

public static <K,
V> HashMap<K,V> newHashMap(int size)

Returns a new HashMap sized to contain size items without resizing the internal array.

newLinkedHashMap

public static <K,
V> LinkedHashMap<K,V> newLinkedHashMap(int size)

Returns a new LinkedHashMap sized to contain size items without resizing the internal array.

newHashSet

public static <E> HashSet<E> newHashSet(int size)

Returns a new HashSet sized to contain size items without resizing the internal array.

isEmpty

public static boolean isEmpty(Collection<?> collection)

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

isEmpty

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

isNotEmpty

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