org.neo4j.helpers.collection

Class Iterables

java.lang.Object

org.neo4j.helpers.collection.Iterables

public final class Iterables
extends Object

TODO: Combine this and IteratorUtil into one class

Constructor Summary

Constructors

Constructor and Description
Iterables()

Method Summary

Methods

Modifier and Type	Method and Description
static <T,C extends Collection<T>> C	addAll(C collection, Iterable<? extends T> iterable)
static <T,C extends T> Iterable<T>	append(C item, Iterable<T> iterable)
static <T> ResourceIterable<T>	asResourceIterable(Iterable<T> labels)
static <T> ResourceIterable<T>	asResourceIterable(ResourceIterator<T> it)
static <T> Iterable<T>	cache(Iterable<T> iterable)
static <FROM,TO> org.neo4j.function.Function<FROM,TO>	cast()
static <T,C> Iterable<T>	cast(Iterable<C> iterable)
static <T> Iterable<T>	concat(Iterable<? extends T>... iterables)
static <T> Iterable<T>	concat(Iterable<Iterable<T>> iterables)
static <T> Iterator<T>	concat(Iterator<? extends T>... iterables)
static <T> Iterator<T>	concat(Iterator<Iterator<T>> iterators)
static <T> ResourceIterator<T>	concatResourceIterators(Iterator<ResourceIterator<T>> iterators)
static long	count(Iterable<?> iterable)
static <T> Iterable<T>	empty()
static <X> Iterable<X>	filter(Predicate<? super X> specification, Iterable<X> i) Deprecated. use filter(Predicate, Iterable) instead
static <X> Iterable<X>	filter(org.neo4j.function.Predicate<? super X> specification, Iterable<X> i)
static <X> Iterator<X>	filter(Predicate<? super X> specification, Iterator<X> i) Deprecated. use filter(Predicate, Iterator) instead
static <X> Iterator<X>	filter(org.neo4j.function.Predicate<? super X> specification, Iterator<X> i)
static <X> X	first(Iterable<? extends X> i)
static <FROM,TO> Iterator<TO>	flatMap(org.neo4j.function.Function<? super FROM,? extends Iterator<TO>> function, Iterator<FROM> from)
static <X,I extends Iterable<? extends X>> Iterable<X>	flatten(I... multiIterator)
static <X,S extends Iterable<? extends X>,I extends Iterable<S>> Iterable<X>	flattenIterable(I multiIterator)
static <T> int	indexOf(T itemToFind, Iterable<T> iterable) Returns the index of the first occurrence of the specified element in this iterable, or -1 if this iterable does not contain the element.
static <T,C extends T> Iterable<T>	iterable(C... items)
static <T> ResourceIterable<T>	iterable(org.neo4j.kernel.impl.transaction.log.IOCursor<T> cursor)
static <T,C extends org.neo4j.cursor.Cursor> ResourceIterator<T>	iterator(C resourceCursor, org.neo4j.function.Function<C,T> map)
static String	join(String joinString, Iterable<?> iter)
static String	join(String joinString, Iterator<?> iter)
static <X> X	last(Iterable<? extends X> i)
static <T> org.neo4j.function.Function<Iterable<T>,Iterable<T>>	limit(int limitItems)
static <T> Iterable<T>	limit(int limitItems, Iterable<T> iterable)
static <FROM,TO> Iterable<TO>	map(org.neo4j.function.Function<? super FROM,? extends TO> function, Iterable<FROM> from)
static <FROM,TO> Iterator<TO>	map(org.neo4j.function.Function<? super FROM,? extends TO> function, Iterator<FROM> from)
static <T> Iterable<T>	mix(Iterable<T>... iterables)
static <T> Iterable<T>	option(T item)
static <T,C extends T> Iterable<T>	prepend(C item, Iterable<T> iterable)
static <X> Iterable<X>	reverse(Iterable<X> iterable)
static <X> X	single(Iterable<? extends X> i)
static <X> Iterable<X>	skip(int skip, Iterable<X> iterable)
static <T,S extends Comparable> Iterable<T>	sort(Iterable<T> iterable, org.neo4j.function.Function<T,S> compareFunction)
static <T> T[]	toArray(Class<T> componentType, Iterable<T> iterable)
static Object[]	toArray(Iterable<Object> iterable)
static <T> List<T>	toList(Iterable<T> iterable)
static <T> List<T>	toList(Iterator<T> iterator)
static <T> Set<T>	toSet(Iterable<T> iterable)
static String	toString(Iterable<?> values, String separator)
static <T> Iterable<T>	unique(Iterable<T> iterable)

Methods inherited from class java.lang.Object

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

Constructor Detail

Iterables

public Iterables()

Method Detail

empty

public static <T> Iterable<T> empty()

limit

public static <T> Iterable<T> limit(int limitItems,
                    Iterable<T> iterable)

limit

public static <T> org.neo4j.function.Function<Iterable<T>,Iterable<T>> limit(int limitItems)

unique

public static <T> Iterable<T> unique(Iterable<T> iterable)

addAll

public static <T,C extends Collection<T>> C addAll(C collection,
                                   Iterable<? extends T> iterable)

count

public static long count(Iterable<?> iterable)

filter

@Deprecated
public static <X> Iterable<X> filter(Predicate<? super X> specification,
                                Iterable<X> i)

Deprecated. use filter(Predicate, Iterable) instead

Type Parameters:

X - the type of the elements

Parameters:

specification - filter

i - source iterable

Returns:

a filtering iterable

filter

public static <X> Iterable<X> filter(org.neo4j.function.Predicate<? super X> specification,
                     Iterable<X> i)

filter

@Deprecated
public static <X> Iterator<X> filter(Predicate<? super X> specification,
                                Iterator<X> i)

Deprecated. use filter(Predicate, Iterator) instead

Type Parameters:

X - the type of the elements

Parameters:

specification - filter

i - source iterator

Returns:

a filtering iterator

filter

public static <X> Iterator<X> filter(org.neo4j.function.Predicate<? super X> specification,
                     Iterator<X> i)

first

public static <X> X first(Iterable<? extends X> i)

single

public static <X> X single(Iterable<? extends X> i)

skip

public static <X> Iterable<X> skip(int skip,
                   Iterable<X> iterable)

last

public static <X> X last(Iterable<? extends X> i)

reverse

public static <X> Iterable<X> reverse(Iterable<X> iterable)

flatten

@SafeVarargs
public static <X,I extends Iterable<? extends X>> Iterable<X> flatten(I... multiIterator)

flattenIterable

public static <X,S extends Iterable<? extends X>,I extends Iterable<S>> Iterable<X> flattenIterable(I multiIterator)

mix

@SafeVarargs
public static <T> Iterable<T> mix(Iterable<T>... iterables)

map

public static <FROM,TO> Iterable<TO> map(org.neo4j.function.Function<? super FROM,? extends TO> function,
                         Iterable<FROM> from)

map

public static <FROM,TO> Iterator<TO> map(org.neo4j.function.Function<? super FROM,? extends TO> function,
                         Iterator<FROM> from)

flatMap

public static <FROM,TO> Iterator<TO> flatMap(org.neo4j.function.Function<? super FROM,? extends Iterator<TO>> function,
                             Iterator<FROM> from)

iterable

@SafeVarargs
public static <T,C extends T> Iterable<T> iterable(C... items)

cast

public static <T,C> Iterable<T> cast(Iterable<C> iterable)

concat

@SafeVarargs
public static <T> Iterable<T> concat(Iterable<? extends T>... iterables)

concat

public static <T> Iterable<T> concat(Iterable<Iterable<T>> iterables)

concat

@SafeVarargs
public static <T> Iterator<T> concat(Iterator<? extends T>... iterables)

concatResourceIterators

public static <T> ResourceIterator<T> concatResourceIterators(Iterator<ResourceIterator<T>> iterators)

concat

public static <T> Iterator<T> concat(Iterator<Iterator<T>> iterators)

cast

public static <FROM,TO> org.neo4j.function.Function<FROM,TO> cast()

prepend

public static <T,C extends T> Iterable<T> prepend(C item,
                                  Iterable<T> iterable)

append

public static <T,C extends T> Iterable<T> append(C item,
                                 Iterable<T> iterable)

cache

public static <T> Iterable<T> cache(Iterable<T> iterable)

toList

public static <T> List<T> toList(Iterable<T> iterable)

toList

public static <T> List<T> toList(Iterator<T> iterator)

toArray

public static Object[] toArray(Iterable<Object> iterable)

toArray

public static <T> T[] toArray(Class<T> componentType,
              Iterable<T> iterable)

asResourceIterable

public static <T> ResourceIterable<T> asResourceIterable(Iterable<T> labels)

asResourceIterable

public static <T> ResourceIterable<T> asResourceIterable(ResourceIterator<T> it)

iterable

public static <T> ResourceIterable<T> iterable(org.neo4j.kernel.impl.transaction.log.IOCursor<T> cursor)

iterator

public static <T,C extends org.neo4j.cursor.Cursor> ResourceIterator<T> iterator(C resourceCursor,
                                                                 org.neo4j.function.Function<C,T> map)

toSet

public static <T> Set<T> toSet(Iterable<T> iterable)

toString

public static String toString(Iterable<?> values,
              String separator)

indexOf

public static <T> int indexOf(T itemToFind,
              Iterable<T> iterable)

Returns the index of the first occurrence of the specified element in this iterable, or -1 if this iterable does not contain the element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

Type Parameters:

T - the type of the elements

Parameters:

itemToFind - element to find

iterable - iterable to look for the element in

Returns:

the index of the first occurrence of the specified element (or null if that was specified) or -1

option

public static <T> Iterable<T> option(T item)

sort

public static <T,S extends Comparable> Iterable<T> sort(Iterable<T> iterable,
                                        org.neo4j.function.Function<T,S> compareFunction)

join

public static String join(String joinString,
          Iterable<?> iter)

join

public static String join(String joinString,
          Iterator<?> iter)