Package org.opensearch.common.util
Class CollectionUtils
java.lang.Object
org.opensearch.common.util.CollectionUtils
public class CollectionUtils
extends java.lang.Object
Collections-related utility methods.
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Constructor Summary
Constructors Constructor Description CollectionUtils()
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Method Summary
Modifier and Type Method Description static <E> java.util.ArrayList<E>
arrayAsArrayList(E... elements)
static <E> java.util.ArrayList<E>
asArrayList(E first, E... other)
static <E> java.util.ArrayList<E>
asArrayList(E first, E second, E... other)
static <R, T> java.util.Map<R,T>
copyMap(java.util.Map<R,T> map)
Returns an unmodifiable copy of the given map.static <E> java.util.List<java.util.List<E>>
eagerPartition(java.util.List<E> list, int size)
static void
ensureNoSelfReferences(java.lang.Object value, java.lang.String messageHint)
Deeply inspects a Map, Iterable, or Object array looking for references back to itself.static boolean
isEmpty(java.lang.Object[] array)
Checks if the given array contains any elements.static <E> java.util.ArrayList<E>
iterableAsArrayList(java.lang.Iterable<? extends E> elements)
static <E> java.util.ArrayList<E>
newSingletonArrayList(E element)
static <T> java.util.List<T>
rotate(java.util.List<T> list, int distance)
Return a rotated view of the given list with the given distance.static void
sort(com.carrotsearch.hppc.ObjectArrayList<byte[]> array)
static void
sort(org.apache.lucene.util.BytesRefArray bytes, int[] indices)
static void
sortAndDedup(com.carrotsearch.hppc.ObjectArrayList<byte[]> array)
static int
sortAndDedup(org.apache.lucene.util.BytesRefArray bytes, int[] indices)
static int[]
toArray(java.util.Collection<java.lang.Integer> ints)
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Constructor Details
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CollectionUtils
public CollectionUtils()
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Method Details
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isEmpty
public static boolean isEmpty(java.lang.Object[] array)Checks if the given array contains any elements.- Parameters:
array
- The array to check- Returns:
- false if the array contains an element, true if not or the array is null.
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rotate
public static <T> java.util.List<T> rotate(java.util.List<T> list, int distance)Return a rotated view of the given list with the given distance. -
sortAndDedup
public static void sortAndDedup(com.carrotsearch.hppc.ObjectArrayList<byte[]> array) -
sort
public static void sort(com.carrotsearch.hppc.ObjectArrayList<byte[]> array) -
toArray
public static int[] toArray(java.util.Collection<java.lang.Integer> ints) -
ensureNoSelfReferences
public static void ensureNoSelfReferences(java.lang.Object value, java.lang.String messageHint)Deeply inspects a Map, Iterable, or Object array looking for references back to itself.- Parameters:
value
- The object to evaluate looking for self referencesmessageHint
- A string to be included in the exception message if the call fails, to provide more context to the handler of the exception- Throws:
java.lang.IllegalArgumentException
- if a self-reference is found
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copyMap
public static <R, T> java.util.Map<R,T> copyMap(java.util.Map<R,T> map)Returns an unmodifiable copy of the given map.- Parameters:
map
- Map to copy- Returns:
- unmodifiable copy of the map
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sort
public static void sort(org.apache.lucene.util.BytesRefArray bytes, int[] indices) -
sortAndDedup
public static int sortAndDedup(org.apache.lucene.util.BytesRefArray bytes, int[] indices) -
iterableAsArrayList
public static <E> java.util.ArrayList<E> iterableAsArrayList(java.lang.Iterable<? extends E> elements) -
arrayAsArrayList
public static <E> java.util.ArrayList<E> arrayAsArrayList(E... elements) -
asArrayList
public static <E> java.util.ArrayList<E> asArrayList(E first, E... other) -
asArrayList
public static <E> java.util.ArrayList<E> asArrayList(E first, E second, E... other) -
newSingletonArrayList
public static <E> java.util.ArrayList<E> newSingletonArrayList(E element) -
eagerPartition
public static <E> java.util.List<java.util.List<E>> eagerPartition(java.util.List<E> list, int size)
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