/*
 * Copyright (C) 2021 Christian Pierre MOMON <christian.momon@devinsy.fr>
 * 
 * This file is part of AgirStatool, simple key value database.
 * 
 * AgirStatool is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * AgirStatool 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with AgirStatool.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.april.agirstatool.core;

import java.util.ArrayList;
import java.util.Collections;

/**
 * The Class LongList.
 */
public class LongList extends ArrayList<Long>
{
	private static final long serialVersionUID = 2724688980125113107L;

	/**
	 * Instantiates a new stat.
	 */
	public LongList()
	{
		super();
	}

	/**
	 * Median.
	 *
	 * @return the double
	 */
	public double median()
	{
		double result;

		sort();

		if (this.isEmpty())
		{
			result = 0;
		}
		else if (this.size() % 2 == 0)
		{
			long a = get(this.size() / 2 - 1);
			long b = get(this.size() / 2);
			result = (a + b) / 2;
		}
		else
		{
			result = get(this.size() / 2);
		}

		//
		return result;
	}

	/**
	 * Sort.
	 */
	public void sort()
	{
		Collections.sort(this);
	}
}