org.apache.jackrabbit.spi.commons.iterator

Class Iterators

java.lang.Object

org.apache.jackrabbit.spi.commons.iterator.Iterators

public final class Iterators
extends Object

Utility class containing type safe adapters for some of the iterators of commons-collections.

Method Summary

Modifier and Type	Method and Description
static <T> Iterator<T>	arrayIterator(T[] values, int from, int to) Returns an iterator for elements of an array of values.
static <T> Iterator<T>	empty() Returns an empty iterator of type T.
static <T> Iterator<T>	filterIterator(Iterator<? extends T> iterator, Predicate<? super T> predicate) Returns an iterator with elements from an original iterator where the given predicate matches removed.
static <T> Iterator<T>	iteratorChain(Collection<Iterator<? extends T>> iterators) Returns an iterator for the concatenation of all the given iterators.
static <T> Iterator<T>	iteratorChain(Iterator<? extends T>[] iterators) Returns an iterator for the concatenation of all the given iterators.
static <T> Iterator<T>	iteratorChain(Iterator<? extends T> iterator1, Iterator<? extends T> iterator2) Returns an iterator for the concatenation of iterator1 and iterator2.
static Iterator<Node>	nodes(NodeIterator nodeIterator) Returns an iterator of Node from a NodeIterator.
static Iterator<Property>	properties(PropertyIterator propertyIterator) Returns an iterator of Property from a PropertyIterator.
static <T> Iterator<T>	singleton(T element) Returns an iterator containing the single element element of type T.
static <T,R,S extends T> Iterator<R>	transformIterator(Iterator<? extends T> iterator, Transformer<S,? super R> transformer) Returns an iterator with elements of an original iterator transformed by a transformer.

Methods inherited from class java.lang.Object

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

Method Detail

singleton

public static <T> Iterator<T> singleton(T element)

Returns an iterator containing the single element element of type T.

Type Parameters:

T -

Parameters:

element -

Returns:

empty

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

Returns an empty iterator of type T.

Type Parameters:

T -

Returns:

iteratorChain

public static <T> Iterator<T> iteratorChain(Iterator<? extends T> iterator1,
                                            Iterator<? extends T> iterator2)

Returns an iterator for the concatenation of iterator1 and iterator2.

Type Parameters:

T -

Parameters:

iterator1 -

iterator2 -

Returns:

iteratorChain

public static <T> Iterator<T> iteratorChain(Iterator<? extends T>[] iterators)

Returns an iterator for the concatenation of all the given iterators.

Type Parameters:

T -

Parameters:

iterators -

Returns:

iteratorChain

public static <T> Iterator<T> iteratorChain(Collection<Iterator<? extends T>> iterators)

Returns an iterator for the concatenation of all the given iterators.

Type Parameters:

T -

Parameters:

iterators -

Returns:

arrayIterator

public static <T> Iterator<T> arrayIterator(T[] values,
                                            int from,
                                            int to)

Returns an iterator for elements of an array of values.

Type Parameters:

T -

Parameters:

values - the array to iterate over.

from - the index to start iterating at.

to - the index to finish iterating at.

Returns:

filterIterator

public static <T> Iterator<T> filterIterator(Iterator<? extends T> iterator,
                                             Predicate<? super T> predicate)

Returns an iterator with elements from an original iterator where the given predicate matches removed.

Type Parameters:

T -

Parameters:

iterator -

predicate -

Returns:

transformIterator

public static <T,R,S extends T> Iterator<R> transformIterator(Iterator<? extends T> iterator,
                                                              Transformer<S,? super R> transformer)

Returns an iterator with elements of an original iterator transformed by a transformer.

Type Parameters:

T -

R -

S -

Parameters:

iterator -

transformer -

Returns:

properties

public static Iterator<Property> properties(PropertyIterator propertyIterator)

Returns an iterator of Property from a PropertyIterator.

Parameters:

propertyIterator -

Returns:

nodes

public static Iterator<Node> nodes(NodeIterator nodeIterator)

Returns an iterator of Node from a NodeIterator.

Parameters:

nodeIterator -

Returns: