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The DSI utilities are a mish mash of classes accumulated during the last ten 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) 2002-2016 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.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.Object2LongOpenHashMap;

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

import org.junit.Test;

public class ShiftAddXorSignedStringMapTest {
	
	@Test
	public void testNumbers() throws IOException, ClassNotFoundException {
		
		for( int width = 16; width <= Long.SIZE; width += 8 ) {
			String[] s = new String[ 1000 ];
			long[] v = new long[ s.length ];
			for( int i = s.length; i-- != 0; ) s[ (int)( v[ i ] = i  )] = Integer.toString( i );

			// Test with mph
			Object2LongOpenHashMap mph = new Object2LongOpenHashMap( s, v );
			ShiftAddXorSignedStringMap map = new ShiftAddXorSignedStringMap( Arrays.asList( s ).iterator(), mph, width );

			for( int i = s.length; i-- != 0; ) assertEquals( i, map.getLong( Integer.toString( i ) ) );
			for( int i = s.length + 100; i-- != s.length; ) assertEquals( -1, map.getLong( Integer.toString( i ) ) );

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

			for( int i = s.length; i-- != 0; ) assertEquals( i, map.getLong( Integer.toString( i ) ) );
			for( int i = s.length + 100; 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( (String)key );
				return l < 1L << 31 ? l : -1;
			}
			catch( Exception e ) {
				return -1;
			}
		}

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

		@Override
		public int size() {
			return Integer.MAX_VALUE;
		}
		
		public long size64() {
			return 1L << 31;
		}
	}

	@Test
	public void testLarge() {
		new ShiftAddXorSignedStringMap( new AbstractObjectBigList() {

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

			@Override
			public long size64() {
				return 1L << 31;
			}
		}.iterator(), new LargeFunction(), 1 );
	}
		
}