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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.AbstractList;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import java.util.RandomAccess;

final class NullList extends AbstractList implements RandomAccess {
	
	private final int size;
	
	private static final class Iterator implements ListIterator {
		private final int size;
		private int i = 0;
		
		public Iterator(int size) {
			this.size = size;
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#hasNext()
		 */
		@Override
		public boolean hasNext() {
			return (i < size);
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#next()
		 */
		@Override
		public Object next() {
			if(!hasNext())
				throw new NoSuchElementException();
			i++;
			return null;
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#hasPrevious()
		 */
		@Override
		public boolean hasPrevious() {
			return (i > 0);
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#previous()
		 */
		@Override
		public Object previous() {
			if(!hasPrevious())
				throw new NoSuchElementException();
			--i;
			return null;
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#nextIndex()
		 */
		@Override
		public int nextIndex() {
			return i;
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#previousIndex()
		 */
		@Override
		public int previousIndex() {
			return i-1;
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#remove()
		 */
		@Override
		public void remove() {
			throw new UnsupportedOperationException();
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#set(java.lang.Object)
		 */
		@Override
		public void set(Object e) {
			throw new UnsupportedOperationException();
		}
		
		/*
		 * (non-Javadoc)
		 * @see java.util.ListIterator#add(java.lang.Object)
		 */
		@Override
		public void add(Object e) {
			throw new UnsupportedOperationException();
		}
	}
	
	public NullList(int size) {
		this.size = size;
	}

	/*
	 * (non-Javadoc)
	 * @see java.util.AbstractList#get(int)
	 */
	@Override
	public Object get(int index) {
		if(index < 0 || index >= size)
			throw new IndexOutOfBoundsException();
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see java.util.AbstractCollection#size()
	 */
	@Override
	public int size() {
		return size;
	}
	
	/*
	 * (non-Javadoc)
	 * @see java.util.AbstractList#iterator()
	 */
	@Override
	public java.util.Iterator iterator() {
		return new Iterator(size);
	}
	
	/*
	 * (non-Javadoc)
	 * @see java.util.AbstractList#listIterator()
	 */
	@Override
	public ListIterator listIterator() {
		return new Iterator(size);
	}

}
    

    

    
            
    
            







    
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