Package org.apache.tinkerpop.gremlin.util

Class CollectionUtil

java.lang.Object

org.apache.tinkerpop.gremlin.util.CollectionUtil

public final class CollectionUtil
extends Object

Utility class for working with collections and arrays.

Method Summary

Modifier and Type	Method	Description
static <T> T[]	addFirst(T[] array, T element, Class<T> clazz)	Adds the element argument to the start of the supplied array argument, but if the array is null then return the element as a new array with just that item in it.
static <E> List<E>	asList(E... elements)	Converts varargs to a List.
static <K, V> LinkedHashMap<K,V>	asMap(Object... elements)	Converts varargs to a Map where the elements are key/value pairs.
static <E> LinkedHashSet<E>	asSet(E... elements)	Converts varargs to a Set.
static <E> LinkedHashSet<E>	asSet(Collection<E> elements)	Converts Collection to a Set.
static <K, V> ConcurrentHashMap<K,V>	clone(ConcurrentHashMap<K,V> map)	Clones a given ConcurrentHashMap by creating a new map and copying all entries from the original map.

Methods inherited from class java.lang.Object

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

Method Details

asList

public static <E> List<E> asList(E... elements)

Converts varargs to a List.

asSet

public static <E> LinkedHashSet<E> asSet(E... elements)

Converts varargs to a Set.

asSet

public static <E> LinkedHashSet<E> asSet(Collection<E> elements)

Converts Collection to a Set.

asMap

public static <K,
V> LinkedHashMap<K,V> asMap(Object... elements)

Converts varargs to a Map where the elements are key/value pairs.

clone

public static <K,
V> ConcurrentHashMap<K,V> clone(ConcurrentHashMap<K,V> map)

Clones a given ConcurrentHashMap by creating a new map and copying all entries from the original map. If the value of an entry is a Set or an ArrayList, a deep copy of the value is created. Otherwise, the value is copied as is.

addFirst

public static <T> T[] addFirst(T[] array,
 T element,
 Class<T> clazz)

Adds the element argument to the start of the supplied array argument, but if the array is null then return the element as a new array with just that item in it.