de.tsl2.nano.collection

Class TransformingIterator<S,T>

java.lang.Object

de.tsl2.nano.collection.TransformingIterator<S,T>

All Implemented Interfaces:

Iterator<T>

public class TransformingIterator<S,T>
extends Object
implements Iterator<T>

Runtime transforming Iterator. Wraps the Iterator of the given collection. remove() is not supported! Please see getTransformingIterable(Iterable, ITransformer) to wrap your original collection into a filtered collection.

Version:

$Revision$

Author:

Thomas Schneider

Constructor Summary

Constructors

Constructor and Description
TransformingIterator(Iterable<S> parent, ITransformer<S,T> transformer) constructor

Method Summary

Modifier and Type	Method and Description
static <I extends Iterable<T>,S,T> I	getTransformingIterable(Iterable<S> iterable, ITransformer<S,T> transformer) creates a proxy using the given iterable instance. if an iterator is requested, the orginal iterator will be wrapped into the TransformingIterator.
boolean	hasNext()
T	next()
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

TransformingIterator

public TransformingIterator(Iterable<S> parent,
                            ITransformer<S,T> transformer)

constructor

Parameters:

parent -

transformer -

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

next

public T next()

Specified by:

next in interface Iterator<T>

remove

public void remove()

Specified by:

remove in interface Iterator<T>

getTransformingIterable

public static <I extends Iterable<T>,S,T> I getTransformingIterable(Iterable<S> iterable,
                                                                    ITransformer<S,T> transformer)

creates a proxy using the given iterable instance. if an iterator is requested, the orginal iterator will be wrapped into the TransformingIterator.

As the original instance (the collection) will be preserved, all other methods like size(), contains() etc. will work on the un-filtered content!

Type Parameters:

I - iterable type - mostly at least a collection

T - member type of the iterable

Parameters:

iterable - iterable instance

transformer - item filter/selector

Returns:

proxy, providing the given iterable filtered through the given predicate.