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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/*
* The contents of this file are subject to the terms of the Common Development
* and Distribution License (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the License at http://www.sun.com/cddl/cddl.html
* or http://www.netbeans.org/cddl.txt.
*
* When distributing Covered Code, include this CDDL Header Notice in each file
* and include the License file at http://www.netbeans.org/cddl.txt.
* If applicable, add the following below the CDDL Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* The Original Software is SezPoz. The Initial Developer of the Original
* Software is Sun Microsystems, Inc. Portions Copyright 2008 Sun
* Microsystems, Inc. All Rights Reserved.
*/package org.jvnet.hudson.annotation_indexer;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* @author Kohsuke Kawaguchi
*/
abstract class FilterIterator<T> implements Iterator<T> {
private final Iterator<? extends T> core;
private T next;
private boolean fetched;
protected FilterIterator(Iterator<? extends T> core) {
this.core = core;
}
protected FilterIterator(Iterable<? extends T> core) {
this(core.iterator());
}
private void fetch() {
while(!fetched && core.hasNext()) {
T n = core.next();
if(filter(n)) {
next = n;
fetched = true;
}
}
}
/**
* Filter out items in the original collection.
*
* @return
* true to leave this item and return this item from this iterator.
* false to hide this item.
*/
protected abstract boolean filter(T t);
public boolean hasNext() {
fetch();
return fetched;
}
public T next() {
fetch();
if(!fetched) throw new NoSuchElementException();
fetched = false;
return next;
}
public void remove() {
core.remove();
}
}
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