/**
* Copyright 2009 The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.hadoop.hbase.util;
import java.io.IOException;
import java.util.Arrays;
import junit.framework.TestCase;
public class TestBytes extends TestCase {
public void testNullHashCode() {
byte [] b = null;
Exception ee = null;
try {
Bytes.hashCode(b);
} catch (Exception e) {
ee = e;
}
assertNotNull(ee);
}
public void testSplit() throws Exception {
byte [] lowest = Bytes.toBytes("AAA");
byte [] middle = Bytes.toBytes("CCC");
byte [] highest = Bytes.toBytes("EEE");
byte [][] parts = Bytes.split(lowest, highest, 1);
for (int i = 0; i < parts.length; i++) {
System.out.println(Bytes.toString(parts[i]));
}
assertEquals(3, parts.length);
assertTrue(Bytes.equals(parts[1], middle));
// Now divide into three parts. Change highest so split is even.
highest = Bytes.toBytes("DDD");
parts = Bytes.split(lowest, highest, 2);
for (int i = 0; i < parts.length; i++) {
System.out.println(Bytes.toString(parts[i]));
}
assertEquals(4, parts.length);
// Assert that 3rd part is 'CCC'.
assertTrue(Bytes.equals(parts[2], middle));
}
public void testSplit2() throws Exception {
// More split tests.
byte [] lowest = Bytes.toBytes("http://A");
byte [] highest = Bytes.toBytes("http://z");
byte [] middle = Bytes.toBytes("http://]");
byte [][] parts = Bytes.split(lowest, highest, 1);
for (int i = 0; i < parts.length; i++) {
System.out.println(Bytes.toString(parts[i]));
}
assertEquals(3, parts.length);
assertTrue(Bytes.equals(parts[1], middle));
}
public void testSplit3() throws Exception {
// Test invalid split cases
byte [] low = { 1, 1, 1 };
byte [] high = { 1, 1, 3 };
// If swapped, should throw IAE
try {
Bytes.split(high, low, 1);
assertTrue("Should not be able to split if low > high", false);
} catch(IllegalArgumentException iae) {
// Correct
}
// Single split should work
byte [][] parts = Bytes.split(low, high, 1);
for (int i = 0; i < parts.length; i++) {
System.out.println("" + i + " -> " + Bytes.toStringBinary(parts[i]));
}
assertTrue("Returned split should have 3 parts but has " + parts.length, parts.length == 3);
// If split more than once, this should fail
parts = Bytes.split(low, high, 2);
assertTrue("Returned split but should have failed", parts == null);
// Split 0 times should throw IAE
try {
parts = Bytes.split(low, high, 0);
assertTrue("Should not be able to split 0 times", false);
} catch(IllegalArgumentException iae) {
// Correct
}
}
public void testToLong() throws Exception {
long [] longs = {-1l, 123l, 122232323232l};
for (int i = 0; i < longs.length; i++) {
byte [] b = Bytes.toBytes(longs[i]);
assertEquals(longs[i], Bytes.toLong(b));
}
}
public void testToFloat() throws Exception {
float [] floats = {-1f, 123.123f, Float.MAX_VALUE};
for (int i = 0; i < floats.length; i++) {
byte [] b = Bytes.toBytes(floats[i]);
assertEquals(floats[i], Bytes.toFloat(b));
}
}
public void testToDouble() throws Exception {
double [] doubles = {Double.MIN_VALUE, Double.MAX_VALUE};
for (int i = 0; i < doubles.length; i++) {
byte [] b = Bytes.toBytes(doubles[i]);
assertEquals(doubles[i], Bytes.toDouble(b));
}
}
public void testBinarySearch() throws Exception {
byte [][] arr = {
{1},
{3},
{5},
{7},
{9},
{11},
{13},
{15},
};
byte [] key1 = {3,1};
byte [] key2 = {4,9};
byte [] key2_2 = {4};
byte [] key3 = {5,11};
assertEquals(1, Bytes.binarySearch(arr, key1, 0, 1,
Bytes.BYTES_RAWCOMPARATOR));
assertEquals(0, Bytes.binarySearch(arr, key1, 1, 1,
Bytes.BYTES_RAWCOMPARATOR));
assertEquals(-(2+1), Arrays.binarySearch(arr, key2_2,
Bytes.BYTES_COMPARATOR));
assertEquals(-(2+1), Bytes.binarySearch(arr, key2, 0, 1,
Bytes.BYTES_RAWCOMPARATOR));
assertEquals(4, Bytes.binarySearch(arr, key2, 1, 1,
Bytes.BYTES_RAWCOMPARATOR));
assertEquals(2, Bytes.binarySearch(arr, key3, 0, 1,
Bytes.BYTES_RAWCOMPARATOR));
assertEquals(5, Bytes.binarySearch(arr, key3, 1, 1,
Bytes.BYTES_RAWCOMPARATOR));
}
public void testStartsWith() {
assertTrue(Bytes.startsWith(Bytes.toBytes("hello"), Bytes.toBytes("h")));
assertTrue(Bytes.startsWith(Bytes.toBytes("hello"), Bytes.toBytes("")));
assertTrue(Bytes.startsWith(Bytes.toBytes("hello"), Bytes.toBytes("hello")));
assertFalse(Bytes.startsWith(Bytes.toBytes("hello"), Bytes.toBytes("helloworld")));
assertFalse(Bytes.startsWith(Bytes.toBytes(""), Bytes.toBytes("hello")));
}
public void testIncrementBytes() throws IOException {
assertTrue(checkTestIncrementBytes(10, 1));
assertTrue(checkTestIncrementBytes(12, 123435445));
assertTrue(checkTestIncrementBytes(124634654, 1));
assertTrue(checkTestIncrementBytes(10005460, 5005645));
assertTrue(checkTestIncrementBytes(1, -1));
assertTrue(checkTestIncrementBytes(10, -1));
assertTrue(checkTestIncrementBytes(10, -5));
assertTrue(checkTestIncrementBytes(1005435000, -5));
assertTrue(checkTestIncrementBytes(10, -43657655));
assertTrue(checkTestIncrementBytes(-1, 1));
assertTrue(checkTestIncrementBytes(-26, 5034520));
assertTrue(checkTestIncrementBytes(-10657200, 5));
assertTrue(checkTestIncrementBytes(-12343250, 45376475));
assertTrue(checkTestIncrementBytes(-10, -5));
assertTrue(checkTestIncrementBytes(-12343250, -5));
assertTrue(checkTestIncrementBytes(-12, -34565445));
assertTrue(checkTestIncrementBytes(-1546543452, -34565445));
}
private static boolean checkTestIncrementBytes(long val, long amount)
throws IOException {
byte[] value = Bytes.toBytes(val);
byte [] testValue = {-1, -1, -1, -1, -1, -1, -1, -1};
if (value[0] > 0) {
testValue = new byte[Bytes.SIZEOF_LONG];
}
System.arraycopy(value, 0, testValue, testValue.length - value.length,
value.length);
long incrementResult = Bytes.toLong(Bytes.incrementBytes(value, amount));
return (Bytes.toLong(testValue) + amount) == incrementResult;
}
}