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The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.
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package it.unimi.dsi.util;

/*
 * DSI utilities
 *
 * Copyright (C) 2010-2018 Sebastiano Vigna
 *
 *  This library 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.
 *
 *  This library 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 this program; if not, see .
 *
 */

import static it.unimi.dsi.util.Intervals.EMPTY_INTERVAL;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import it.unimi.dsi.fastutil.ints.IntIterators;
import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
import it.unimi.dsi.fastutil.ints.IntRBTreeSet;
import it.unimi.dsi.fastutil.ints.IntSortedSet;
import it.unimi.dsi.fastutil.ints.IntSortedSets;

import java.util.Arrays;

import org.junit.Test;

public class IntervalTest {

	@Test
	public void testLength() {
		assertEquals(0, EMPTY_INTERVAL.length());
		assertEquals(1, Interval.valueOf(0).length());
		assertEquals(2, Interval.valueOf(0, 1).length());
	}

	@Test
	public void testContainsElement() {
		assertTrue(Interval.valueOf(0).contains(0));
		assertFalse(Interval.valueOf(0).contains(1));
		assertFalse(Interval.valueOf(0).contains(-1));

		assertTrue(Interval.valueOf(0, 1).contains(0));
		assertTrue(Interval.valueOf(0, 1).contains(1));
		assertFalse(Interval.valueOf(0).contains(2));
		assertFalse(Interval.valueOf(0).contains(-1));

		assertFalse(EMPTY_INTERVAL.contains(0));
		assertFalse(EMPTY_INTERVAL.contains(1));
		assertFalse(EMPTY_INTERVAL.contains(-1));
	}

	@Test
	public void testContainsInterval() {
		assertTrue(Interval.valueOf(0).contains(Interval.valueOf(0)));
		assertTrue(Interval.valueOf(0).contains(EMPTY_INTERVAL));
		assertFalse(Interval.valueOf(0).contains(Interval.valueOf(0, 1)));
		assertFalse(Interval.valueOf(0).contains(Interval.valueOf(-1, 0)));

		assertTrue(Interval.valueOf(0, 1).contains(Interval.valueOf(0)));
		assertTrue(Interval.valueOf(0, 1).contains(Interval.valueOf(1)));
		assertTrue(Interval.valueOf(0, 1).contains(Interval.valueOf(0, 1)));
		assertTrue(Interval.valueOf(0, 1).contains(EMPTY_INTERVAL));
		assertFalse(Interval.valueOf(0).contains(Interval.valueOf(-1, 0)));
		assertFalse(Interval.valueOf(0).contains(Interval.valueOf(1, 2)));
		assertFalse(Interval.valueOf(0).contains(Interval.valueOf(-1, 2)));

		assertTrue(EMPTY_INTERVAL.contains(EMPTY_INTERVAL));
		assertFalse(EMPTY_INTERVAL.contains(Interval.valueOf(0)));
		assertFalse(EMPTY_INTERVAL.contains(Interval.valueOf(1)));
		assertFalse(EMPTY_INTERVAL.contains(Interval.valueOf(0, 1)));
	}

	@Test
	public void testContainsRadius() {
		boolean ok = false;
		try {
			EMPTY_INTERVAL.contains(0, 1);
		}
		catch(IllegalArgumentException e) {
			ok = true;
		}
		assertTrue(ok);
		assertTrue(Interval.valueOf(0).contains(1, 1));
		assertFalse(Interval.valueOf(0).contains(2, 1));

		ok = false;
		try {
			EMPTY_INTERVAL.contains(0, 1, 2);
		}
		catch(IllegalArgumentException e) {
			ok = true;
		}
		assertTrue(ok);
		assertTrue(Interval.valueOf(0).contains(1, 1, 2));
		assertTrue(Interval.valueOf(0).contains(2, 1, 2));
		assertFalse(Interval.valueOf(0).contains(3, 1, 2));
	}

	@Test
	public void testCompareInt() {
		boolean ok = false;
		try {
			EMPTY_INTERVAL.compareTo(0);
		}
		catch(IllegalArgumentException e) {
			ok = true;
		}
		assertTrue(ok);
		assertEquals(-1, Interval.valueOf(0).compareTo(-1));
		assertEquals(0, Interval.valueOf(0).compareTo(0));
		assertEquals(1, Interval.valueOf(0).compareTo(1));
		assertEquals(-1, Interval.valueOf(0, 1).compareTo(-1));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(0));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(1));
		assertEquals(1, Interval.valueOf(0, 1).compareTo(2));

		ok = false;
		try {
			EMPTY_INTERVAL.compareTo(0, 1);
		}
		catch(IllegalArgumentException e) {
			ok = true;
		}
		assertTrue(ok);
		assertEquals(-1, Interval.valueOf(0).compareTo(-2, 1));
		assertEquals(0, Interval.valueOf(0).compareTo(-1, 1));
		assertEquals(0, Interval.valueOf(0).compareTo(0, 1));
		assertEquals(0, Interval.valueOf(0).compareTo(1, 1));
		assertEquals(1, Interval.valueOf(0).compareTo(2, 1));

		assertEquals(-1, Interval.valueOf(0, 1).compareTo(-2, 1));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(-1, 1));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(0, 1));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(1, 1));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(2, 1));
		assertEquals(1, Interval.valueOf(0, 1).compareTo(3, 1));

		ok = false;
		try {
			EMPTY_INTERVAL.compareTo(0, 1, 2);
		}
		catch(IllegalArgumentException e) {
			ok = true;
		}
		assertTrue(ok);
		assertEquals(-1, Interval.valueOf(0).compareTo(-2, 1, 2));
		assertEquals(0, Interval.valueOf(0).compareTo(-1, 1, 2));
		assertEquals(0, Interval.valueOf(0).compareTo(0, 1, 2));
		assertEquals(0, Interval.valueOf(0).compareTo(1, 1, 2));
		assertEquals(0, Interval.valueOf(0).compareTo(2, 1, 2));
		assertEquals(1, Interval.valueOf(0).compareTo(3, 1, 2));

		assertEquals(-1, Interval.valueOf(0, 1).compareTo(-2, 1, 2));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(-1, 1, 2));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(0, 1, 2));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(1, 1, 2));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(2, 1, 2));
		assertEquals(0, Interval.valueOf(0, 1).compareTo(3, 1, 2));
		assertEquals(1, Interval.valueOf(0, 1).compareTo(4, 1, 2));

	}

	private IntSortedSet toSortedSet(Interval interval) {
		if (interval == EMPTY_INTERVAL) return IntSortedSets.EMPTY_SET;
		IntSortedSet set = new IntRBTreeSet();
		for(int i = interval.left; i <= interval.right; i++) set.add(i);
		return set;
	}

	@Test
	public void testSubsets() {
		for(int i = 0; i < 10; i++)
			for(int j = i - 1; j < 10; j++) {
				Interval interval = j < i ? EMPTY_INTERVAL : Interval.valueOf(i, j);
				IntSortedSet set = toSortedSet(interval);
				assertEquals(set, interval);
				assertTrue(Arrays.equals(IntIterators.unwrap(set.iterator()), IntIterators.unwrap(interval.iterator())));
				assertEquals(new IntOpenHashSet(set), interval);
				for(int k = j - 1; k <= i + 1; k++) {
					assertTrue(Arrays.equals(IntIterators.unwrap(set.iterator(k)), IntIterators.unwrap(interval.iterator(k))));
					assertEquals(set.headSet(k), interval.headSet(k));
					assertEquals(set.tailSet(k), interval.tailSet(k));
					for(int l = k; l <= i + 1; l++)
						assertEquals(set.subSet(k, l), interval.subSet(k, l));
				}
			}
	}

}