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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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/*
 * DSI utilities
 *
 * Copyright (C) 2002-2020 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 .
 *
 */

package it.unimi.dsi.big.util;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

import org.junit.Test;

import it.unimi.dsi.fastutil.objects.ObjectIterator;

public class ImmutableExternalPrefixMapSlowTest {

	public void testBig(final int blockSize) throws IOException {
		final Iterable p = new Iterable() {
			private final static long INCREMENT= ((1L << 62) / 3000000000L);
			@Override
			public Iterator iterator() {
				return new ObjectIterator() {
					long curr = 0;
					@Override
					public boolean hasNext() {
						return curr < 3000000000L;
					}

					@Override
					public String next() {
						if (! hasNext()) throw new NoSuchElementException();
						final long v = curr++ * INCREMENT ;
						final char[] a = new char[4];
						a[0] = (char)(v >>> 48);
						a[1] = (char)(v >>> 32);
						a[2] = (char)(v >>> 16);
						a[3] = (char)v;
						return String.valueOf(a);
					}
				};
			}
		};

		final ImmutableExternalPrefixMap d = new ImmutableExternalPrefixMap(p, blockSize);

		int j = 0;
		for (final String s : p) {
			assertTrue(s, d.containsKey(s));
			assertEquals(s, d.list().get(j++).toString());
		}

		final Iterator k = d.iterator();
		for(final Iterator i = p.iterator(); i.hasNext();) {
			assertTrue(i.hasNext() == k.hasNext());
			assertEquals(i.next().toString(), k.next().toString());
		}

		// Test negatives
		for(long i = 1000000000000L; i < 1000000002000L; i++) assertEquals(-1, d.getLong(Long.toBinaryString(i)));

	}

	@Test
	public void testBig1024() throws IOException {
		testBig(1024);
	}

	@Test
	public void testBig16384() throws IOException {
		testBig(16384);
	}
}