de.unkrig.commons.util.collections

Class IteratorUtil

java.lang.Object

de.unkrig.commons.util.collections.IteratorUtil

public final class IteratorUtil
extends java.lang.Object

Various Iterator-related utility methods.

Method Summary

Modifier and Type	Method and Description
static <T> java.util.Iterator<T>	atEnd()
static <T> java.util.Iterator<T>	filter(java.util.Iterator<T> delegate, Predicate<? super T> qualifies) Returns an iterator which skips the elements of the delegate which do not qualifiy.
static <T> java.util.Iterator<T>	repeat(int n, T value)
static <T> java.util.Iterator<T>	repeat(T value)
static <I,O> java.util.Iterator<O>	transform(java.util.Iterator<? extends I> delegate, Transformer<? super I,O> transform) Returns an iterator which iterates the transformed elements of the delegate

Methods inherited from class java.lang.Object

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

Method Detail

atEnd

public static <T> java.util.Iterator<T> atEnd()

Returns:

An Iterator which is always at its end

filter

public static <T> java.util.Iterator<T> filter(java.util.Iterator<T> delegate,
                                               Predicate<? super T> qualifies)

Returns an iterator which skips the elements of the delegate which do not qualifiy.

transform

public static <I,O> java.util.Iterator<O> transform(java.util.Iterator<? extends I> delegate,
                                                    Transformer<? super I,O> transform)

Returns an iterator which iterates the transformed elements of the delegate

repeat

public static <T> java.util.Iterator<T> repeat(T value)

Returns:

An iterator that produces an infinite sequence of value elements

repeat

public static <T> java.util.Iterator<T> repeat(int n,
                                               T value)

Returns:

An iterator that produces a sequence of n value elements