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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.io;

/*
 * DSI utilities
 *
 * Copyright (C) 2010-2020 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 .
 *
 */

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import it.unimi.dsi.fastutil.objects.ObjectIterators;
import it.unimi.dsi.lang.MutableString;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.junit.Test;

public class OfflineIterableTest {
	public void doIt(String[] strings) throws IOException {
		OfflineIterable.Serializer stringSerializer = new OfflineIterable.Serializer() {
			@Override
			public void read(DataInput dis, MutableString x) throws IOException {
				x.readSelfDelimUTF8((InputStream)dis);
			}
			@Override
			public void write(MutableString x, DataOutput dos) throws IOException {
				x.writeSelfDelimUTF8((OutputStream)dos);
			}
		};
		OfflineIterable stringIterable = new OfflineIterable<>(stringSerializer, new MutableString());
		for (String s: strings)
			stringIterable.add(new MutableString(s));
		ObjectIterator shouldBe = ObjectIterators.wrap(strings);
		for (MutableString m: stringIterable)
			assertEquals(new MutableString(shouldBe.next()), m);
		assertFalse(shouldBe.hasNext());

		// Let's do it again.
		stringIterable.clear();
		for (String s: strings)
			stringIterable.add(new MutableString(s));
		shouldBe = ObjectIterators.wrap(strings);
		for (MutableString m: stringIterable)
			assertEquals(new MutableString(shouldBe.next()), m);
		assertFalse(shouldBe.hasNext());

		stringIterable.close();
		stringIterable.close(); // Twice, to test for safety
	}

	@Test
	public void testSimple() throws IOException {
		doIt(new String[] { "this", "is", "a", "test" });
	}

	@Test
	public void testEmpty() throws IOException {
		doIt(new String[0]);
	}
}