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/*
* 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.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
/**
* Unit test for {@link UnsignedBytes}.
*
* @author Kevin Bourrillion
*/
public class UnsignedBytesTest extends TestCase {
private static final byte LEAST = 0;
private static final byte GREATEST = (byte) 255;
// Only in this class, VALUES must be strictly ascending
private static final byte[] VALUES =
{LEAST, 127, (byte) 128, (byte) 129, GREATEST};
public void testToInt() {
assertEquals(0, UnsignedBytes.toInt((byte) 0));
assertEquals(1, UnsignedBytes.toInt((byte) 1));
assertEquals(127, UnsignedBytes.toInt((byte) 127));
assertEquals(128, UnsignedBytes.toInt((byte) -128));
assertEquals(129, UnsignedBytes.toInt((byte) -127));
assertEquals(255, UnsignedBytes.toInt((byte) -1));
}
public void testCheckedCast() {
for (byte value : VALUES) {
assertEquals(value,
UnsignedBytes.checkedCast(UnsignedBytes.toInt(value)));
}
assertCastFails(256L);
assertCastFails(-1L);
assertCastFails(Long.MAX_VALUE);
assertCastFails(Long.MIN_VALUE);
}
public void testSaturatedCast() {
for (byte value : VALUES) {
assertEquals(value,
UnsignedBytes.saturatedCast(UnsignedBytes.toInt(value)));
}
assertEquals(GREATEST, UnsignedBytes.saturatedCast(256L));
assertEquals(LEAST, UnsignedBytes.saturatedCast(-1L));
assertEquals(GREATEST, UnsignedBytes.saturatedCast(Long.MAX_VALUE));
assertEquals(LEAST, UnsignedBytes.saturatedCast(Long.MIN_VALUE));
}
private void assertCastFails(long value) {
try {
UnsignedBytes.checkedCast(value);
fail("Cast to byte should have failed: " + value);
} catch (IllegalArgumentException ex) {
assertTrue(value + " not found in exception text: " + ex.getMessage(),
ex.getMessage().contains(String.valueOf(value)));
}
}
public void testCompare() {
// This is the only ordering for primitives that does not have a
// corresponding Comparable wrapper in java.lang.
for (int i = 0; i < VALUES.length; i++) {
for (int j = 0; j < VALUES.length; j++) {
byte x = VALUES[i];
byte y = VALUES[j];
// note: spec requires only that the sign is the same
assertEquals(x + ", " + y,
Math.signum(UnsignedBytes.compare(x, y)),
Math.signum(Ints.compare(i, j)));
}
}
}
public void testMax_noArgs() {
try {
UnsignedBytes.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, UnsignedBytes.max(LEAST));
assertEquals(GREATEST, UnsignedBytes.max(GREATEST));
assertEquals((byte) 255, UnsignedBytes.max(
(byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
}
public void testMin_noArgs() {
try {
UnsignedBytes.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, UnsignedBytes.min(LEAST));
assertEquals(GREATEST, UnsignedBytes.min(GREATEST));
assertEquals((byte) 0, UnsignedBytes.min(
(byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
}
public void testJoin() {
assertEquals("", UnsignedBytes.join(",", new byte[] {}));
assertEquals("1", UnsignedBytes.join(",", new byte[] {(byte) 1}));
assertEquals("1,2", UnsignedBytes.join(",", (byte) 1, (byte) 2));
assertEquals("123", UnsignedBytes.join("", (byte) 1, (byte) 2, (byte) 3));
assertEquals("128,255", UnsignedBytes.join(",", (byte) 128, (byte) -1));
}
public void testLexicographicalComparatorDefaultChoice() {
Comparator<byte[]> defaultComparator =
UnsignedBytes.lexicographicalComparator();
Comparator<byte[]> unsafeComparator =
UnsignedBytes.LexicographicalComparatorHolder.UnsafeComparator.INSTANCE;
assertSame(defaultComparator, unsafeComparator);
}
public void testLexicographicalComparator() {
List<byte[]> ordered = Arrays.asList(
new byte[] {},
new byte[] {LEAST},
new byte[] {LEAST, LEAST},
new byte[] {LEAST, (byte) 1},
new byte[] {(byte) 1},
new byte[] {(byte) 1, LEAST},
new byte[] {GREATEST, GREATEST - (byte) 1},
new byte[] {GREATEST, GREATEST},
new byte[] {GREATEST, GREATEST, GREATEST});
// The Unsafe implementation if it's available. Otherwise, the Java implementation.
Comparator<byte[]> comparator = UnsignedBytes.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
assertSame(comparator, SerializableTester.reserialize(comparator));
// The Java implementation.
Comparator<byte[]> javaImpl = UnsignedBytes.lexicographicalComparatorJavaImpl();
Helpers.testComparator(javaImpl, ordered);
assertSame(javaImpl, SerializableTester.reserialize(javaImpl));
}
public void testNulls() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(byte[].class, new byte[0]);
tester.testAllPublicStaticMethods(UnsignedBytes.class);
}
}
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