com.alee.utils

Class CollectionUtils

java.lang.Object

com.alee.utils.CollectionUtils

public final class CollectionUtils
extends java.lang.Object

This class provides a set of utilities to work with collections.

Constructor Summary

Constructors

Constructor and Description
CollectionUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> boolean	addAll(java.util.Collection<T> collection, T... objects) Adds all objects into specified list.
static boolean	areEqual(java.util.List list1, java.util.List list2) Returns whether lists are equal or not.
static <T extends java.lang.Cloneable> java.util.List<T>	clone(java.util.Collection<T> collection) Returns clone of the specified list.
static <T> java.util.List<T>	copy(java.util.Collection<T> collection) Returns copy of the specified list.
static <T> java.util.List<T>	copy(T... data) Returns data converted into list.
static <T> java.util.List<T>	filter(java.util.Collection<T> collection, Filter<T> filter) Returns list of elements filtered from collection.
static <K,V> java.util.List<K>	keysList(java.util.Map<K,V> map) Returns map keys list.
static <T> java.util.List<T>	removeNulls(java.util.List<T> list) Removes all null elements from list.
static int[]	toArray(java.util.List<java.lang.Integer> list) Returns an int array created using Integer list.
static <T> java.util.List<T>	toList(java.util.Deque<T> deque) Returns a list of objects converted from deque.
static <T> java.util.List<T>	toList(T[] array) Returns a list of objects converted from array.
static <T> java.util.List<java.lang.String>	toStringList(java.util.List<T> list, TextProvider<T> textProvider) Returns list of strings extracted from the specified elements list.
static <K,V> java.util.List<V>	valuesList(java.util.Map<K,V> map) Returns map values list.
static <K,V> java.util.List<V>	valuesSummaryList(java.util.Map<K,java.util.List<V>> map) Returns map values summary list with unique elements only.

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

addAll

public static <T> boolean addAll(java.util.Collection<T> collection,
                 T... objects)

Adds all objects into specified list.

Type Parameters:

T - objects type

Parameters:

collection - list to fill

objects - objects

Returns:

true if list changed as the result of this operation, false otherwise

copy

public static <T> java.util.List<T> copy(java.util.Collection<T> collection)

Returns copy of the specified list. Note that this method will copy same list values into the new list.

Type Parameters:

T - list type

Parameters:

collection - list to copy

Returns:

copy of the specified list

clone

public static <T extends java.lang.Cloneable> java.util.List<T> clone(java.util.Collection<T> collection)

Returns clone of the specified list. Note that this method will clone all values into new list.

Type Parameters:

T - list type

Parameters:

collection - list to clone

Returns:

clone of the specified list

copy

public static <T> java.util.List<T> copy(T... data)

Returns data converted into list.

Type Parameters:

T - data type

Parameters:

data - data

Returns:

data list

removeNulls

public static <T> java.util.List<T> removeNulls(java.util.List<T> list)

Removes all null elements from list.

Type Parameters:

T - list type

Parameters:

list - list to refactor

Returns:

refactored list

areEqual

public static boolean areEqual(java.util.List list1,
               java.util.List list2)

Returns whether lists are equal or not.

Parameters:

list1 - first list

list2 - second list

Returns:

true if lists are equal, false otherwise

toStringList

public static <T> java.util.List<java.lang.String> toStringList(java.util.List<T> list,
                                                TextProvider<T> textProvider)

Returns list of strings extracted from the specified elements list.

Type Parameters:

T - elements type

Parameters:

list - elements list

textProvider - text provider

Returns:

list of strings extracted from the specified elements list

toArray

public static int[] toArray(java.util.List<java.lang.Integer> list)

Returns an int array created using Integer list.

Parameters:

list - Integer list

Returns:

int array

toList

public static <T> java.util.List<T> toList(T[] array)

Returns a list of objects converted from array.

Type Parameters:

T - data type

Parameters:

array - data array

Returns:

data list

toList

public static <T> java.util.List<T> toList(java.util.Deque<T> deque)

Returns a list of objects converted from deque.

Type Parameters:

T - data type

Parameters:

deque - data deque

Returns:

data list

filter

public static <T> java.util.List<T> filter(java.util.Collection<T> collection,
                           Filter<T> filter)

Returns list of elements filtered from collection.

Type Parameters:

T - elements type

Parameters:

collection - collecton to filter

filter - filter to process

Returns:

list of elements filtered from collection

keysList

public static <K,V> java.util.List<K> keysList(java.util.Map<K,V> map)

Returns map keys list.

Type Parameters:

K - key object type

V - value object type

Parameters:

map - map to process

Returns:

map keys list

valuesList

public static <K,V> java.util.List<V> valuesList(java.util.Map<K,V> map)

Returns map values list.

Type Parameters:

K - key object type

V - value object type

Parameters:

map - map to process

Returns:

map values list

valuesSummaryList

public static <K,V> java.util.List<V> valuesSummaryList(java.util.Map<K,java.util.List<V>> map)

Returns map values summary list with unique elements only.

Type Parameters:

K - key object type

V - value object type

Parameters:

map - map to process

Returns:

map values summary list with unique elements only