org.echocat.locela.api.java.utils

Class CollectionUtils

java.lang.Object

org.echocat.locela.api.java.utils.CollectionUtils

public class CollectionUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static <T,C extends Collection<T>> C	addAll(C to, Iterable<T> elements)
static <T,C extends Collection<T>> C	addAll(C to, Iterator<T> elements)
static <T,C extends Collection<T>> C	addAll(C to, T... elements)
static <T> Collection<T>	asCollection(Iterable<T> in)
static <T> List<T>	asImmutableList(Iterable<T> in)
static <T> List<T>	asImmutableList(T... objects) Returns an unmodifiable List containing the given objects, returns an empty List, if objects is null.
static <K,V> Map<K,V>	asImmutableMap(Map<K,V> map)
static <K,V> Map<K,V>	asImmutableMap(Object... a) Returns a LinkedHashMap with the mappings a[0] => a[1], a[2] => a[3], ....
static <T> Set<T>	asImmutableSet(Iterable<T> in)
static <T> List<T>	asList(Enumeration<T> in)
static <T> List<T>	asList(Iterable<T> in)
static <T> List<T>	asList(Iterator<T> iterator)
static <T> List<T>	asList(T... objects) Returns a List containing the given objects, returns an empty List, if objects is null.
static <K,V> Map<K,V>	asMap(Object... a) Returns a LinkedHashMap with the mappings a[0] => a[1], a[2] => a[3], ....
static <T> Set<T>	asSet(Iterable<T> in)
static <T> long	countElementsOf(Iterable<T> iterable)
static <T> long	countElementsOf(Iterator<T> iterator)
static <T> CloseableIterator<T>	emptyIterator()
static <K,V> Map<K,V>	putAll(Map<K,V> original, Object... a) Returns the given map enriched with the mappings a[0] => a[1], a[2] => a[3], ....
static <K,V> Map<K,V>	putAllAndMakeImmutable(Map<K,V> original, Object... a) Returns the given map enriched with the mappings a[0] => a[1], a[2] => a[3], ....

Methods inherited from class java.lang.Object

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

Method Detail

putAll

@Nonnull
public static <K,V> Map<K,V> putAll(@Nonnull
                                             Map<K,V> original,
                                             @Nullable
                                             Object... a)

Returns the given map enriched with the mappings a[0] => a[1], a[2] => a[3], ....

Parameters:

a - the elements to construct a Map from.

Returns:

a Map constructed of the specified elements.

asMap

@Nonnull
public static <K,V> Map<K,V> asMap(@Nullable
                                            Object... a)

Returns a LinkedHashMap with the mappings a[0] => a[1], a[2] => a[3], ....

Parameters:

a - the elements to construct a Map from.

Returns:

a Map constructed of the specified elements.

putAllAndMakeImmutable

@Nonnull
public static <K,V> Map<K,V> putAllAndMakeImmutable(@Nonnull
                                                             Map<K,V> original,
                                                             @Nullable
                                                             Object... a)

Returns the given map enriched with the mappings a[0] => a[1], a[2] => a[3], ....

Parameters:

a - the elements to construct a Map from.

Returns:

an immutable Map constructed of the specified elements.

asImmutableMap

@Nonnull
public static <K,V> Map<K,V> asImmutableMap(@Nullable
                                                     Object... a)

Returns a LinkedHashMap with the mappings a[0] => a[1], a[2] => a[3], ....

Parameters:

a - the elements to construct a Map from.

Returns:

an immutable Map constructed of the specified elements.

asImmutableMap

@Nonnull
public static <K,V> Map<K,V> asImmutableMap(@Nullable
                                                     Map<K,V> map)

addAll

@SafeVarargs
 @Nonnull
public static <T,C extends Collection<T>> C addAll(@Nonnull
                                                                          C to,
                                                                          @Nullable
                                                                          T... elements)

addAll

@Nonnull
public static <T,C extends Collection<T>> C addAll(@Nonnull
                                                            C to,
                                                            @Nullable
                                                            Iterable<T> elements)

addAll

@Nonnull
public static <T,C extends Collection<T>> C addAll(@Nonnull
                                                            C to,
                                                            @Nullable
                                                            Iterator<T> elements)

asCollection

@Nonnull
public static <T> Collection<T> asCollection(@Nullable
                                                      Iterable<T> in)

asList

@SafeVarargs
 @Nonnull
public static <T> List<T> asList(@Nullable
                                                        T... objects)

Returns a List containing the given objects, returns an empty List, if objects is null.

asImmutableList

@SafeVarargs
 @Nonnull
public static <T> List<T> asImmutableList(@Nullable
                                                                 T... objects)

Returns an unmodifiable List containing the given objects, returns an empty List, if objects is null.

asList

@Nonnull
public static <T> List<T> asList(@Nullable
                                          Iterator<T> iterator)

asList

@Nonnull
public static <T> List<T> asList(@Nullable
                                          Iterable<T> in)

asList

@Nonnull
public static <T> List<T> asList(@Nullable
                                          Enumeration<T> in)

asImmutableList

@Nonnull
public static <T> List<T> asImmutableList(@Nullable
                                                   Iterable<T> in)

asSet

@Nonnull
public static <T> Set<T> asSet(@Nullable
                                        Iterable<T> in)

asImmutableSet

@Nonnull
public static <T> Set<T> asImmutableSet(@Nullable
                                                 Iterable<T> in)

emptyIterator

@Nonnull
public static <T> CloseableIterator<T> emptyIterator()

countElementsOf

@Nonnegative
public static <T> long countElementsOf(@Nullable
                                                    Iterable<T> iterable)

countElementsOf

@Nonnegative
public static <T> long countElementsOf(@Nullable
                                                    Iterator<T> iterator)