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Basic utility library containing several useful classes (e.g., a Pair class) to ease everyday programming.

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/* Copyright (C) 2013 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 * 
 * AutomataLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * AutomataLib 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with AutomataLib; if not, see
 * http://www.gnu.de/documents/lgpl.en.html.
 */
package net.automatalib.commons.util.collections;

import java.util.Iterator;


public abstract class ThreeLevelIterator implements Iterator {
	
	private static class Outer {
		private L1 l1Item;
		private L2 l2Item;
	}
	
	private class OuterIterator extends TwoLevelIterator> {

		private final Outer value = new Outer<>();
		
		public OuterIterator(Iterator l1Iterator) {
			super(l1Iterator);
		}

		@Override
		protected Iterator l2Iterator(L1 l1Object) {
			return ThreeLevelIterator.this.l2Iterator(l1Object);
		}

		@Override
		protected Outer combine(L1 l1Object, L2 l2Object) {
			value.l1Item = l1Object;
			value.l2Item = l2Object;
			return value;
		}
	}
	
	private class InnerIterator extends TwoLevelIterator,L3,O> {
		public InnerIterator(Iterator> outerIterator) {
			super(outerIterator);
		}
		@Override
		protected Iterator l2Iterator(Outer outer) {
			return ThreeLevelIterator.this.l3Iterator(outer.l1Item, outer.l2Item);
		}
		@Override
		protected O combine(Outer outer, L3 l3Object) {
			return ThreeLevelIterator.this.combine(outer.l1Item, outer.l2Item, l3Object);
		}
	}
	
	private final InnerIterator innerIterator;
	
	public ThreeLevelIterator(Iterator l1Iterator) {
		OuterIterator outerIterator = new OuterIterator(l1Iterator);
		this.innerIterator = new InnerIterator(outerIterator);
	}

	
	protected abstract Iterator l2Iterator(L1 l1Object);
	protected abstract Iterator l3Iterator(L1 l1Object, L2 l2Object);
	
	
	protected abstract O combine(L1 l1Object, L2 l2Object, L3 l3Object);


	/* (non-Javadoc)
	 * @see java.util.Iterator#hasNext()
	 */
	@Override
	public boolean hasNext() {
		return innerIterator.hasNext();
	}


	/* (non-Javadoc)
	 * @see java.util.Iterator#next()
	 */
	@Override
	public O next() {
		return innerIterator.next();
	}


	/* (non-Javadoc)
	 * @see java.util.Iterator#remove()
	 */
	@Override
	public void remove() {
		innerIterator.remove();
	}	
	
	

}