/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2017, 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;


import java.util.function.Supplier;


public class Lazy<T> implements Supplier<T>
{
	private final Supplier<T> supplier;
	private T instance = null;

	public Lazy( final Supplier<T> supplier )
	{
		this.supplier = supplier;
	}

	@Override
	public T get()
	{
		if( this.instance == null )
		{
			this.instance = this.supplier.get();
		}
		return this.instance;
	}
}