/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.util.prioritylist;


import java.util.ArrayList;
import java.util.Collection;

import appeng.api.storage.data.IAEStack;


public final class MergedPriorityList<T extends IAEStack<T>> implements IPartitionList<T>
{

	private final Collection<IPartitionList<T>> positive = new ArrayList<IPartitionList<T>>();
	private final Collection<IPartitionList<T>> negative = new ArrayList<IPartitionList<T>>();

	public void addNewList( final IPartitionList<T> list, final boolean isWhitelist )
	{
		if( isWhitelist )
		{
			this.positive.add( list );
		}
		else
		{
			this.negative.add( list );
		}
	}

	@Override
	public boolean isListed( final T input )
	{
		for( final IPartitionList<T> l : this.negative )
		{
			if( l.isListed( input ) )
			{
				return false;
			}
		}

		if( !this.positive.isEmpty() )
		{
			for( final IPartitionList<T> l : this.positive )
			{
				if( l.isListed( input ) )
				{
					return true;
				}
			}

			return false;
		}

		return true;
	}

	@Override
	public boolean isEmpty()
	{
		return this.positive.isEmpty() && this.negative.isEmpty();
	}

	@Override
	public Iterable<T> getItems()
	{
		throw new UnsupportedOperationException();
	}
}