/*
* Copyright (C) 2008 The Guava Authors
*
* 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 com.google.common.primitives;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* Unit test for {@link Bytes}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
public class BytesTest extends TestCase {
private static final byte[] EMPTY = {};
private static final byte[] ARRAY1 = {(byte) 1};
private static final byte[] ARRAY234
= {(byte) 2, (byte) 3, (byte) 4};
private static final byte[] VALUES =
{ Byte.MIN_VALUE, -1, 0, 1, Byte.MAX_VALUE };
public void testHashCode() {
for (byte value : VALUES) {
assertEquals(((Byte) value).hashCode(), Bytes.hashCode(value));
}
}
public void testContains() {
assertFalse(Bytes.contains(EMPTY, (byte) 1));
assertFalse(Bytes.contains(ARRAY1, (byte) 2));
assertFalse(Bytes.contains(ARRAY234, (byte) 1));
assertTrue(Bytes.contains(new byte[] {(byte) -1}, (byte) -1));
assertTrue(Bytes.contains(ARRAY234, (byte) 2));
assertTrue(Bytes.contains(ARRAY234, (byte) 3));
assertTrue(Bytes.contains(ARRAY234, (byte) 4));
}
public void testIndexOf() {
assertEquals(-1, Bytes.indexOf(EMPTY, (byte) 1));
assertEquals(-1, Bytes.indexOf(ARRAY1, (byte) 2));
assertEquals(-1, Bytes.indexOf(ARRAY234, (byte) 1));
assertEquals(0, Bytes.indexOf(
new byte[] {(byte) -1}, (byte) -1));
assertEquals(0, Bytes.indexOf(ARRAY234, (byte) 2));
assertEquals(1, Bytes.indexOf(ARRAY234, (byte) 3));
assertEquals(2, Bytes.indexOf(ARRAY234, (byte) 4));
assertEquals(1, Bytes.indexOf(
new byte[] { (byte) 2, (byte) 3, (byte) 2, (byte) 3 },
(byte) 3));
}
public void testIndexOf_arrayTarget() {
assertEquals(0, Bytes.indexOf(EMPTY, EMPTY));
assertEquals(0, Bytes.indexOf(ARRAY234, EMPTY));
assertEquals(-1, Bytes.indexOf(EMPTY, ARRAY234));
assertEquals(-1, Bytes.indexOf(ARRAY234, ARRAY1));
assertEquals(-1, Bytes.indexOf(ARRAY1, ARRAY234));
assertEquals(0, Bytes.indexOf(ARRAY1, ARRAY1));
assertEquals(0, Bytes.indexOf(ARRAY234, ARRAY234));
assertEquals(0, Bytes.indexOf(
ARRAY234, new byte[] { (byte) 2, (byte) 3 }));
assertEquals(1, Bytes.indexOf(
ARRAY234, new byte[] { (byte) 3, (byte) 4 }));
assertEquals(1, Bytes.indexOf(ARRAY234, new byte[] { (byte) 3 }));
assertEquals(2, Bytes.indexOf(ARRAY234, new byte[] { (byte) 4 }));
assertEquals(1, Bytes.indexOf(new byte[] { (byte) 2, (byte) 3,
(byte) 3, (byte) 3, (byte) 3 },
new byte[] { (byte) 3 }
));
assertEquals(2, Bytes.indexOf(
new byte[] { (byte) 2, (byte) 3, (byte) 2,
(byte) 3, (byte) 4, (byte) 2, (byte) 3},
new byte[] { (byte) 2, (byte) 3, (byte) 4}
));
assertEquals(1, Bytes.indexOf(
new byte[] { (byte) 2, (byte) 2, (byte) 3,
(byte) 4, (byte) 2, (byte) 3, (byte) 4},
new byte[] { (byte) 2, (byte) 3, (byte) 4}
));
assertEquals(-1, Bytes.indexOf(
new byte[] { (byte) 4, (byte) 3, (byte) 2},
new byte[] { (byte) 2, (byte) 3, (byte) 4}
));
}
public void testLastIndexOf() {
assertEquals(-1, Bytes.lastIndexOf(EMPTY, (byte) 1));
assertEquals(-1, Bytes.lastIndexOf(ARRAY1, (byte) 2));
assertEquals(-1, Bytes.lastIndexOf(ARRAY234, (byte) 1));
assertEquals(0, Bytes.lastIndexOf(
new byte[] {(byte) -1}, (byte) -1));
assertEquals(0, Bytes.lastIndexOf(ARRAY234, (byte) 2));
assertEquals(1, Bytes.lastIndexOf(ARRAY234, (byte) 3));
assertEquals(2, Bytes.lastIndexOf(ARRAY234, (byte) 4));
assertEquals(3, Bytes.lastIndexOf(
new byte[] { (byte) 2, (byte) 3, (byte) 2, (byte) 3 },
(byte) 3));
}
public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Bytes.concat()));
assertTrue(Arrays.equals(EMPTY, Bytes.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Bytes.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Bytes.concat(ARRAY1)));
assertNotSame(ARRAY1, Bytes.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Bytes.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(Arrays.equals(
new byte[] {(byte) 1, (byte) 1, (byte) 1},
Bytes.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(Arrays.equals(
new byte[] {(byte) 1, (byte) 2, (byte) 3, (byte) 4},
Bytes.concat(ARRAY1, ARRAY234)));
}
public void testEnsureCapacity() {
assertSame(EMPTY, Bytes.ensureCapacity(EMPTY, 0, 1));
assertSame(ARRAY1, Bytes.ensureCapacity(ARRAY1, 0, 1));
assertSame(ARRAY1, Bytes.ensureCapacity(ARRAY1, 1, 1));
assertTrue(Arrays.equals(
new byte[] {(byte) 1, (byte) 0, (byte) 0},
Bytes.ensureCapacity(ARRAY1, 2, 1)));
}
public void testEnsureCapacity_fail() {
try {
Bytes.ensureCapacity(ARRAY1, -1, 1);
fail();
} catch (IllegalArgumentException expected) {
}
try {
// notice that this should even fail when no growth was needed
Bytes.ensureCapacity(ARRAY1, 1, -1);
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testToArray() {
// need explicit type parameter to avoid javac warning!?
List<Byte> none = Arrays.<Byte>asList();
assertTrue(Arrays.equals(EMPTY, Bytes.toArray(none)));
List<Byte> one = Arrays.asList((byte) 1);
assertTrue(Arrays.equals(ARRAY1, Bytes.toArray(one)));
byte[] array = {(byte) 0, (byte) 1, (byte) 0x55};
List<Byte> three = Arrays.asList((byte) 0, (byte) 1, (byte) 0x55);
assertTrue(Arrays.equals(array, Bytes.toArray(three)));
assertTrue(Arrays.equals(array, Bytes.toArray(Bytes.asList(array))));
}
public void testToArray_threadSafe() {
for (int delta : new int[] { +1, 0, -1 }) {
for (int i = 0; i < VALUES.length; i++) {
List<Byte> list = Bytes.asList(VALUES).subList(0, i);
Collection<Byte> misleadingSize =
Helpers.misleadingSizeCollection(delta);
misleadingSize.addAll(list);
byte[] arr = Bytes.toArray(misleadingSize);
assertEquals(i, arr.length);
for (int j = 0; j < i; j++) {
assertEquals(VALUES[j], arr[j]);
}
}
}
}
public void testToArray_withNull() {
List<Byte> list = Arrays.asList((byte) 0, (byte) 1, null);
try {
Bytes.toArray(list);
fail();
} catch (NullPointerException expected) {
}
}
public void testAsList_isAView() {
byte[] array = {(byte) 0, (byte) 1};
List<Byte> list = Bytes.asList(array);
list.set(0, (byte) 2);
assertTrue(Arrays.equals(new byte[] {(byte) 2, (byte) 1}, array));
array[1] = (byte) 3;
assertEquals(Arrays.asList((byte) 2, (byte) 3), list);
}
public void testAsList_toArray_roundTrip() {
byte[] array = { (byte) 0, (byte) 1, (byte) 2 };
List<Byte> list = Bytes.asList(array);
byte[] newArray = Bytes.toArray(list);
// Make sure it returned a copy
list.set(0, (byte) 4);
assertTrue(Arrays.equals(
new byte[] { (byte) 0, (byte) 1, (byte) 2 }, newArray));
newArray[1] = (byte) 5;
assertEquals((byte) 1, (byte) list.get(1));
}
// This test stems from a real bug found by andrewk
public void testAsList_subList_toArray_roundTrip() {
byte[] array = { (byte) 0, (byte) 1, (byte) 2, (byte) 3 };
List<Byte> list = Bytes.asList(array);
assertTrue(Arrays.equals(new byte[] { (byte) 1, (byte) 2 },
Bytes.toArray(list.subList(1, 3))));
assertTrue(Arrays.equals(new byte[] {},
Bytes.toArray(list.subList(2, 2))));
}
public void testAsListEmpty() {
assertSame(Collections.emptyList(), Bytes.asList(EMPTY));
}
@GwtIncompatible("NullPointerTester")
public void testNulls() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(byte[].class, new byte[0]);
tester.testAllPublicStaticMethods(Bytes.class);
}
}