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Util.Collections
Class FilterIterator  

java.lang.Object
  Util.Collections.UnmodifiableIterator
      Util.Collections.FilterIterator

All Implemented Interfaces:

java.util.Iterator

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public class FilterIterator

extends UnmodifiableIterator

implements java.util.Iterator

A FilterIterator filters and maps a source Iterator to generate a new one. Note that this implementation reads one element ahead, so if the Filter changes for an object 'o' between the time that is read (when next() is called, returning the object preceding 'o', and checking that 'o' satisfies the current Filter) and the time when hasNext() is called, 'o' will still be returned, regardless of what Filter.isElement(o) returns. Thus, it is recommended that only Filters which remain consistent throughout the iteration be used.

Version:

$Id: FilterIterator.java,v 1.1 2003/03/05 08:26:27 joewhaley Exp $

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Nested Class Summary
static class	FilterIterator.Filter

 

Field Summary
private  boolean	done
(package private)  FilterIterator.Filter	f
(package private)  java.util.Iterator	i
private  java.lang.Object	next

 

Constructor Summary

FilterIterator(java.util.Iterator i, FilterIterator.Filter f)           Creates a FilterIterator.

 

Method Summary
private  void	advance()
boolean	hasNext()           Tests whether there are elements remaining in the collection.
java.lang.Object	next()           Obtain the next element in the collection.

 

Methods inherited from class Util.Collections.UnmodifiableIterator

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

remove

 

Field Detail

i

java.util.Iterator i

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f

FilterIterator.Filter f

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next

private java.lang.Object next

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done

private boolean done

Constructor Detail

FilterIterator

public FilterIterator(java.util.Iterator i,
                      FilterIterator.Filter f)

Creates a FilterIterator.

Method Detail

advance

private void advance()

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next

public java.lang.Object next()

Description copied from interface: java.util.Iterator

Obtain the next element in the collection.

Specified by:

next in interface java.util.Iterator

Specified by:

next in class UnmodifiableIterator

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hasNext

public boolean hasNext()

Description copied from interface: java.util.Iterator

Tests whether there are elements remaining in the collection. In other words, calling next() will not throw an exception.

Specified by:

hasNext in interface java.util.Iterator

Specified by:

hasNext in class UnmodifiableIterator

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