test.it.unimi.dsi.big.util.LiterallySignedStringMapTest Maven / Gradle / Ivy

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package it.unimi.dsi.big.util;

/*
 * DSI utilities
 *
 * Copyright (C) 2002-2017 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;
			}
		});
	}
}