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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.util;
import org.apache.lucene.store.ByteArrayDataInput;
import org.apache.lucene.store.ByteArrayDataOutput;
import org.elasticsearch.test.ElasticsearchTestCase;
import java.io.IOException;
public class ByteUtilsTests extends ElasticsearchTestCase {
public void testZigZag(long l) {
assertEquals(l, ByteUtils.zigZagDecode(ByteUtils.zigZagEncode(l)));
}
public void testZigZag() {
testZigZag(0);
testZigZag(1);
testZigZag(-1);
testZigZag(Long.MAX_VALUE);
testZigZag(Long.MIN_VALUE);
for (int i = 0; i < 1000; ++i) {
testZigZag(randomLong());
assertTrue(ByteUtils.zigZagEncode(randomInt(1000)) >= 0);
assertTrue(ByteUtils.zigZagEncode(-randomInt(1000)) >= 0);
}
}
public void testFloat() throws IOException {
final float[] data = new float[atLeast(1000)];
final byte[] encoded = new byte[data.length * 4];
for (int i = 0; i < data.length; ++i) {
data[i] = randomFloat();
ByteUtils.writeFloatLE(data[i], encoded, i * 4);
}
for (int i = 0; i < data.length; ++i) {
assertEquals(data[i], ByteUtils.readFloatLE(encoded, i * 4), Float.MIN_VALUE);
}
}
public void testDouble() throws IOException {
final double[] data = new double[atLeast(1000)];
final byte[] encoded = new byte[data.length * 8];
for (int i = 0; i < data.length; ++i) {
data[i] = randomDouble();
ByteUtils.writeDoubleLE(data[i], encoded, i * 8);
}
for (int i = 0; i < data.length; ++i) {
assertEquals(data[i], ByteUtils.readDoubleLE(encoded, i * 8), Double.MIN_VALUE);
}
}
public void testVLong() throws IOException {
final long[] data = new long[atLeast(1000)];
for (int i = 0; i < data.length; ++i) {
switch (randomInt(4)) {
case 0:
data[i] = 0;
break;
case 1:
data[i] = Long.MAX_VALUE;
break;
case 2:
data[i] = Long.MIN_VALUE;
break;
case 3:
data[i] = randomInt(1 << randomIntBetween(2,30));
break;
case 4:
data[i] = randomLong();
break;
default:
throw new AssertionError();
}
}
final byte[] encoded = new byte[ByteUtils.MAX_BYTES_VLONG * data.length];
ByteArrayDataOutput out = new ByteArrayDataOutput(encoded);
for (int i = 0; i < data.length; ++i) {
final int pos = out.getPosition();
ByteUtils.writeVLong(out, data[i]);
if (data[i] < 0) {
assertEquals(ByteUtils.MAX_BYTES_VLONG, out.getPosition() - pos);
}
}
final ByteArrayDataInput in = new ByteArrayDataInput(encoded);
for (int i = 0; i < data.length; ++i) {
assertEquals(data[i], ByteUtils.readVLong(in));
}
}
}
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