/*
This file is part of JOP, the Java Optimized Processor
see <http://www.jopdesign.com/>
Copyright (C) 2011, Benedikt Huber (benedikt@vmars.tuwien.ac.at)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.jopdesign.common.misc;
import java.util.Iterator;
/**
* Purpose: A functional map for Iterables
*
* @author Benedikt Huber (benedikt@vmars.tuwien.ac.at)
*
*/
public abstract class MappedIterable<T1, T2> implements Iterable<T2> {
private Iterable<? extends T1> source;
/**
* @param source input generator
*/
public MappedIterable(Iterable<? extends T1> source) {
this.source = source;
}
protected abstract T2 map(T1 in);
private class MapIterator implements Iterator<T2> {
private Iterator<? extends T1> sourceIterator;
public MapIterator() {
this.sourceIterator = source.iterator();
}
@Override
public boolean hasNext() {
return sourceIterator.hasNext();
}
@Override
public T2 next() {
T1 in = sourceIterator.next();
if(in == null) return null;
return map(in);
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove() not supported by MapIterator");
}
}
@Override
public Iterator<T2> iterator() {
return new MapIterator();
}
}