PredicateIterator.java Java code example - Click here to copy ->>>
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// -----------------------------------------------------------------------------
// PredicateIterator.java
// -----------------------------------------------------------------------------
/*
* =============================================================================
* Copyright (c) 1998-2005 Jeffrey M. Hunter. All rights reserved.
*
* All source code and material located at the Internet address of
* http://www.idevelopment.info is the copyright of Jeffrey M. Hunter, 2005 and
* is protected under copyright laws of the United States. This source code may
* not be hosted on any other site without my express, prior, written
* permission. Application to host any of the material elsewhere can be made by
* contacting me at jhunter@idevelopment.info.
*
* I have made every effort and taken great care in making sure that the source
* code and other content included on my web site is technically accurate, but I
* disclaim any and all responsibility for any loss, damage or destruction of
* data or any other property which may arise from relying on it. I will in no
* case be liable for any monetary damages arising from such loss, damage or
* destruction.
*
* As with any code, ensure to test this code in a development environment
* before attempting to run it in production.
* =============================================================================
*/
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* -----------------------------------------------------------------------------
* The following class implements the Iterator interface and provides access
* to a predicate that will filter out certains elements using the Predicate
* interface.
*
* @version 1.0
* @author Jeffrey M. Hunter (jhunter@idevelopment.info)
* @author http://www.idevelopment.info
* -----------------------------------------------------------------------------
*/
public class PredicateIterator implements Iterator {
Iterator iter;
Predicate pred;
Object next;
boolean doneNext = false;
public PredicateIterator(Iterator iter, Predicate pred) {
this.iter = iter;
this.pred = pred;
}
public void remove() {
throw new UnsupportedOperationException();
}
public boolean hasNext() {
doneNext = true;
boolean hasNext;
while (hasNext = iter.hasNext()) {
next = iter.next();
if (pred.predicate(next)) {
break;
}
}
return hasNext;
}
public Object next() {
if (!doneNext) {
boolean has = hasNext();
if (!has) {
throw new NoSuchElementException();
}
}
doneNext = false;
return next;
}
}
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The list of classes which were used on this page you can find below. The
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