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/*
* Copyright (C) 2017-2022 Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package it.unimi.dsi.fastutil.bytes;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.Iterator;
import java.util.SplittableRandom;
import org.junit.Ignore;
import org.junit.Test;
import it.unimi.dsi.fastutil.objects.ObjectListIterator;
@SuppressWarnings({"rawtypes", "unchecked"})
public class ByteArrayFrontCodedBigListTest {
private static java.util.Random r = new java.util.Random(0);
private static byte genKey() {
return (byte)(r.nextInt());
}
private static boolean contentEquals(final java.util.List x, final java.util.List y) {
if (x.size() != y.size()) return false;
for (int i = 0; i < x.size(); i++)
if (!java.util.Arrays.equals((byte[])x.get(i), (byte[])y.get(i))) return false;
return true;
}
private static int l[];
private static byte[][] a;
private static void test(final int n) throws IOException, ClassNotFoundException {
l = new int[n];
a = new byte[n][];
for (int i = 0; i < n; i++)
l[i] = (int)(Math.abs(r.nextGaussian()) * 32);
for (int i = 0; i < n; i++)
a[i] = new byte[l[i]];
for (int i = 0; i < n; i++)
for (int j = 0; j < l[i]; j++)
a[i][j] = genKey();
ByteArrayFrontCodedList m = new ByteArrayFrontCodedList(it.unimi.dsi.fastutil.objects.ObjectIterators.wrap(a), r.nextInt(4) + 1);
final it.unimi.dsi.fastutil.objects.ObjectArrayList t = new it.unimi.dsi.fastutil.objects.ObjectArrayList(a);
// System.out.println(m);
// for(i = 0; i < t.size(); i++)
// System.out.println(ARRAY_LIST.wrap((KEY_TYPE[])t.get(i)));
/* Now we check that m actually holds that data. */
assertTrue("Error: m does not equal t at creation", contentEquals(m, t));
/* Now we check cloning. */
assertTrue("Error: m does not equal m.clone()", contentEquals(m, m.clone()));
/* Now we play with iterators. */
{
ObjectListIterator i;
java.util.ListIterator j;
i = m.listIterator();
j = t.listIterator();
for (int k = 0; k < 2 * n; k++) {
assertTrue("Error: divergence in hasNext()", i.hasNext() == j.hasNext());
assertTrue("Error: divergence in hasPrevious()", i.hasPrevious() == j.hasPrevious());
if (r.nextFloat() < .8 && i.hasNext()) {
assertTrue("Error: divergence in next()", java.util.Arrays.equals((byte[])i.next(), (byte[])j.next()));
}
else if (r.nextFloat() < .2 && i.hasPrevious()) {
assertTrue("Error: divergence in previous()", java.util.Arrays.equals((byte[])i.previous(), (byte[])j.previous()));
}
assertTrue("Error: divergence in nextIndex()", i.nextIndex() == j.nextIndex());
assertTrue("Error: divergence in previousIndex()", i.previousIndex() == j.previousIndex());
}
}
{
final int from = r.nextInt(m.size() + 1);
ObjectListIterator i;
java.util.ListIterator j;
i = m.listIterator(from);
j = t.listIterator(from);
for (int k = 0; k < 2 * n; k++) {
assertTrue("Error: divergence in hasNext() (iterator with starting point " + from + ")", i.hasNext() == j.hasNext());
assertTrue("Error: divergence in hasPrevious() (iterator with starting point " + from + ")", i.hasPrevious() == j.hasPrevious());
if (r.nextFloat() < .8 && i.hasNext()) {
assertTrue("Error: divergence in next() (iterator with starting point " + from + ")", java.util.Arrays.equals((byte[])i.next(), (byte[])j.next()));
// System.err.println("Done next " + I + " " + J + " " + badPrevious);
}
else if (r.nextFloat() < .2 && i.hasPrevious()) {
assertTrue("Error: divergence in previous() (iterator with starting point " + from + ")", java.util.Arrays.equals((byte[])i.previous(), (byte[])j.previous()));
}
}
}
final java.io.File ff = new java.io.File("it.unimi.dsi.fastutil.test.junit." + m.getClass().getSimpleName() + "." + n);
final java.io.OutputStream os = new java.io.FileOutputStream(ff);
final java.io.ObjectOutputStream oos = new java.io.ObjectOutputStream(os);
oos.writeObject(m);
oos.close();
final java.io.InputStream is = new java.io.FileInputStream(ff);
final java.io.ObjectInputStream ois = new java.io.ObjectInputStream(is);
m = (ByteArrayFrontCodedList)ois.readObject();
ois.close();
ff.delete();
assertTrue("Error: m does not equal t after save/read", contentEquals(m, t));
return;
}
@Test
public void test1() throws IOException, ClassNotFoundException {
test(1);
}
@Test
public void test10() throws Exception, ClassNotFoundException {
test(10);
}
@Test
public void test100() throws IOException, ClassNotFoundException {
test(100);
}
@Test
public void test1000() throws IOException, ClassNotFoundException {
test(1000);
}
@Test
public void test10000() throws IOException, ClassNotFoundException {
test(10000);
}
@Ignore("Needs a lot of memory")
@Test
public void testbig() {
final long size = (1L<<31) + 10000;
final ByteArrayFrontCodedBigList byteArrayFrontCodedBigList = new ByteArrayFrontCodedBigList(new Iterator() {
SplittableRandom r = new SplittableRandom(0);
long i = 0;
@Override
public boolean hasNext() {
return i < size;
}
@Override
public Object next() {
i++;
return new byte[] { (byte)r.nextLong() };
}
}, 10);
SplittableRandom r = new SplittableRandom(0);
for (long i = 0; i < size; i++) assertArrayEquals(new byte[] {
(byte)r.nextLong() }, byteArrayFrontCodedBigList.get(i));
final byte b[] = new byte[1];
r = new SplittableRandom(0);
for (long i = 0; i < size; i++) {
byteArrayFrontCodedBigList.get(i, b);
assertArrayEquals(new byte[] { (byte)r.nextLong() }, b);
}
}
}
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