at.molindo.utils.collections
Class IteratorUtils

java.lang.Object
  at.molindo.utils.collections.IteratorUtils

public class IteratorUtils
extends Object

Field Summary

static Iterator<?>

EMPTY_ITERATOR

Method Summary

static <T,C extends Collection<T>> C	addAll(C collection, Iterator<T> iter) adds all elements from iter to collection
static <T> Iterable<T>	cast(Class<T> cls, Iterable<?> iterable) a type safe cast for Iterable
static <T> Iterable<T>	cast(Class<T> cls, Object[] list) type safe cast from any array to an Iterable
static <T> Iterator<T>	empty() type save access to EMPTY_ITERATOR
static <T> Iterable<T>	iterable(Iterator<T> iter)
static <T> ArrayList<T>	list(Iterator<T> iter)
static <T> ArrayList<T>	list(Iterator<T> iter, int initialCapacity)
static <T> Iterator<T>	max(Iterator<T> iter, int max) don't return more elements than given by max
static <T> T	next(Iterator<T> iter)
static <T> Iterator<T>	skip(Iterator<T> iter, int skip) skips a given number of elements in iterator while there are available

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ITERATOR

public static final Iterator<?> EMPTY_ITERATOR

Method Detail

iterable

public static <T> Iterable<T> iterable(Iterator<T> iter)

Type Parameters:

T -

Parameters:

iter -

Returns:

an Iterable that alway returns the passed Iterator instance

next

public static <T> T next(Iterator<T> iter)

Type Parameters:

T -

Parameters:

iter -

Returns:

the next element if available, null otherwise

list

public static <T> ArrayList<T> list(Iterator<T> iter)

Type Parameters:

T -

Parameters:

iter -

Returns:

an ArrayList containing all elements

list

public static <T> ArrayList<T> list(Iterator<T> iter,
                                    int initialCapacity)

Type Parameters:

T -

Parameters:

iter -

Returns:

an ArrayList containing all elements

addAll

public static <T,C extends Collection<T>> C addAll(C collection,
                                                   Iterator<T> iter)

adds all elements from iter to collection

Type Parameters:

T -

C -

Parameters:

collection -

iter -

Returns:

empty

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

type save access to EMPTY_ITERATOR

Type Parameters:

T -

Returns:

cast

public static <T> Iterable<T> cast(Class<T> cls,
                                   Object[] list)

type safe cast from any array to an Iterable

Type Parameters:

T -

Parameters:

cls -

list -

Returns:

cast

public static <T> Iterable<T> cast(Class<T> cls,
                                   Iterable<?> iterable)

a type safe cast for Iterable

Type Parameters:

T -

Parameters:

cls -

iterable -

Returns:

skip

public static <T> Iterator<T> skip(Iterator<T> iter,
                                   int skip)

skips a given number of elements in iterator while there are available

Type Parameters:

T -

Parameters:

iter -

skip -

Returns:

max

public static <T> Iterator<T> max(Iterator<T> iter,
                                  int max)

don't return more elements than given by max

Type Parameters:

T -

Parameters:

iter -

max -

Returns: