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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.big.util;

/*
 * 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 .
 *
 */


import static org.junit.Assert.assertEquals;
import it.unimi.dsi.fastutil.Hash;
import it.unimi.dsi.fastutil.Size64;
import it.unimi.dsi.fastutil.io.BinIO;
import it.unimi.dsi.fastutil.objects.AbstractObject2LongFunction;
import it.unimi.dsi.fastutil.objects.AbstractObjectBigList;
import it.unimi.dsi.fastutil.objects.Object2LongOpenCustomHashMap;
import it.unimi.dsi.fastutil.objects.ObjectBigLists;
import it.unimi.dsi.lang.MutableString;
import it.unimi.dsi.util.FrontCodedStringList;

import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;

import org.junit.Test;

public class LiterallySignedStringMapTest {

	private final static class CharSequenceStrategy implements Hash.Strategy, Serializable {
		private static final long serialVersionUID = 1L;

		@Override
		public boolean equals(CharSequence a, CharSequence b) {
			if (a == null) return b == null;
			if (b == null) return false;
			return a.toString().equals(b.toString());
		}

		@Override
		public int hashCode(CharSequence o) {
			return o.toString().hashCode();
		}
	}

	@Test
	public void testNumbers() throws IOException, ClassNotFoundException {
		for(int n = 10; n < 10000; n *= 10) {
			String[] s = new String[n];
			for(int i = s.length; i-- != 0;) s[i] = Integer.toString(i);
			Collections.shuffle(Arrays.asList(s));

			FrontCodedStringList fcl = new FrontCodedStringList(Arrays.asList(s), 8, true);
			// Test with mph
			Object2LongOpenCustomHashMap mph = new Object2LongOpenCustomHashMap<>(new CharSequenceStrategy());
			mph.defaultReturnValue(-1);
			for(int i = 0; i < s.length; i++) mph.put(new MutableString(s[i]),  i);

			LiterallySignedStringMap map = new LiterallySignedStringMap(mph, ObjectBigLists.asBigList(fcl));

			for(int i = s.length; i-- != 0;) assertEquals(i, map.getLong(s[i]));
			for(int i = s.length + n; i-- != s.length;) assertEquals(-1, map.getLong(Integer.toString(i)));

			File temp = File.createTempFile(getClass().getSimpleName(), "test");
			temp.deleteOnExit();
			BinIO.storeObject(map, temp);
			map = (LiterallySignedStringMap)BinIO.loadObject(temp);

			for(int i = s.length; i-- != 0;) assertEquals(i, map.getLong(s[i]));
			for(int i = s.length + n; i-- != s.length;) assertEquals(-1, map.getLong(Integer.toString(i)));
		}
	}

	private final class LargeFunction extends AbstractObject2LongFunction implements Size64 {
		private static final long serialVersionUID = 1L;

		@Override
		public long getLong(Object key) {
			try {
				final long l = Long.parseLong(key.toString());
				return l < 1L << 31 ? l : -1;
			}
			catch(Exception e) {
				return -1;
			}
		}

		@Override
		public boolean containsKey(Object key) {
			try {
				final long l = Long.parseLong(key.toString());
				return l < 1L << 31;
			}
			catch(Exception e) {
				return false;
			}
		}

		@Override
		public int size() {
			return Integer.MAX_VALUE;
		}

		@Override
		public long size64() {
			return 1L << 31;
		}
	}

	@Test
	public void testLarge() {
		new LiterallySignedStringMap(new LargeFunction(), new AbstractObjectBigList() {

			@Override
			public MutableString get(long index) {
				return new MutableString(Long.toString(index));
			}

			@Override
			public long size64() {
				return 1L << 31;
			}
		});
	}
}