/*
* 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 com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
/**
* Unit test for {@link Ints}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("cast") // redundant casts are intentional and harmless
public class IntsTest extends TestCase {
private static final int[] EMPTY = {};
private static final int[] ARRAY1 = {(int) 1};
private static final int[] ARRAY234
= {(int) 2, (int) 3, (int) 4};
private static final int LEAST = Integer.MIN_VALUE;
private static final int GREATEST = Integer.MAX_VALUE;
private static final int[] VALUES =
{ LEAST, (int) -1, (int) 0, (int) 1, GREATEST };
public void testHashCode() {
for (int value : VALUES) {
assertEquals(((Integer) value).hashCode(), Ints.hashCode(value));
}
}
public void testCheckedCast() {
for (int value : VALUES) {
assertEquals(value, Ints.checkedCast((long) value));
}
assertCastFails(GREATEST + 1L);
assertCastFails(LEAST - 1L);
assertCastFails(Long.MAX_VALUE);
assertCastFails(Long.MIN_VALUE);
}
public void testSaturatedCast() {
for (int value : VALUES) {
assertEquals(value, Ints.saturatedCast((long) value));
}
assertEquals(GREATEST, Ints.saturatedCast(GREATEST + 1L));
assertEquals(LEAST, Ints.saturatedCast(LEAST - 1L));
assertEquals(GREATEST, Ints.saturatedCast(Long.MAX_VALUE));
assertEquals(LEAST, Ints.saturatedCast(Long.MIN_VALUE));
}
private void assertCastFails(long value) {
try {
Ints.checkedCast(value);
fail("Cast to int 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() {
for (int x : VALUES) {
for (int y : VALUES) {
// note: spec requires only that the sign is the same
assertEquals(x + ", " + y,
Integer.valueOf(x).compareTo(y),
Ints.compare(x, y));
}
}
}
public void testContains() {
assertFalse(Ints.contains(EMPTY, (int) 1));
assertFalse(Ints.contains(ARRAY1, (int) 2));
assertFalse(Ints.contains(ARRAY234, (int) 1));
assertTrue(Ints.contains(new int[] {(int) -1}, (int) -1));
assertTrue(Ints.contains(ARRAY234, (int) 2));
assertTrue(Ints.contains(ARRAY234, (int) 3));
assertTrue(Ints.contains(ARRAY234, (int) 4));
}
public void testIndexOf() {
assertEquals(-1, Ints.indexOf(EMPTY, (int) 1));
assertEquals(-1, Ints.indexOf(ARRAY1, (int) 2));
assertEquals(-1, Ints.indexOf(ARRAY234, (int) 1));
assertEquals(0, Ints.indexOf(
new int[] {(int) -1}, (int) -1));
assertEquals(0, Ints.indexOf(ARRAY234, (int) 2));
assertEquals(1, Ints.indexOf(ARRAY234, (int) 3));
assertEquals(2, Ints.indexOf(ARRAY234, (int) 4));
assertEquals(1, Ints.indexOf(
new int[] { (int) 2, (int) 3, (int) 2, (int) 3 },
(int) 3));
}
public void testIndexOf_arrayTarget() {
assertEquals(0, Ints.indexOf(EMPTY, EMPTY));
assertEquals(0, Ints.indexOf(ARRAY234, EMPTY));
assertEquals(-1, Ints.indexOf(EMPTY, ARRAY234));
assertEquals(-1, Ints.indexOf(ARRAY234, ARRAY1));
assertEquals(-1, Ints.indexOf(ARRAY1, ARRAY234));
assertEquals(0, Ints.indexOf(ARRAY1, ARRAY1));
assertEquals(0, Ints.indexOf(ARRAY234, ARRAY234));
assertEquals(0, Ints.indexOf(
ARRAY234, new int[] { (int) 2, (int) 3 }));
assertEquals(1, Ints.indexOf(
ARRAY234, new int[] { (int) 3, (int) 4 }));
assertEquals(1, Ints.indexOf(ARRAY234, new int[] { (int) 3 }));
assertEquals(2, Ints.indexOf(ARRAY234, new int[] { (int) 4 }));
assertEquals(1, Ints.indexOf(new int[] { (int) 2, (int) 3,
(int) 3, (int) 3, (int) 3 },
new int[] { (int) 3 }
));
assertEquals(2, Ints.indexOf(
new int[] { (int) 2, (int) 3, (int) 2,
(int) 3, (int) 4, (int) 2, (int) 3},
new int[] { (int) 2, (int) 3, (int) 4}
));
assertEquals(1, Ints.indexOf(
new int[] { (int) 2, (int) 2, (int) 3,
(int) 4, (int) 2, (int) 3, (int) 4},
new int[] { (int) 2, (int) 3, (int) 4}
));
assertEquals(-1, Ints.indexOf(
new int[] { (int) 4, (int) 3, (int) 2},
new int[] { (int) 2, (int) 3, (int) 4}
));
}
public void testLastIndexOf() {
assertEquals(-1, Ints.lastIndexOf(EMPTY, (int) 1));
assertEquals(-1, Ints.lastIndexOf(ARRAY1, (int) 2));
assertEquals(-1, Ints.lastIndexOf(ARRAY234, (int) 1));
assertEquals(0, Ints.lastIndexOf(
new int[] {(int) -1}, (int) -1));
assertEquals(0, Ints.lastIndexOf(ARRAY234, (int) 2));
assertEquals(1, Ints.lastIndexOf(ARRAY234, (int) 3));
assertEquals(2, Ints.lastIndexOf(ARRAY234, (int) 4));
assertEquals(3, Ints.lastIndexOf(
new int[] { (int) 2, (int) 3, (int) 2, (int) 3 },
(int) 3));
}
public void testMax_noArgs() {
try {
Ints.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, Ints.max(LEAST));
assertEquals(GREATEST, Ints.max(GREATEST));
assertEquals((int) 9, Ints.max(
(int) 8, (int) 6, (int) 7,
(int) 5, (int) 3, (int) 0, (int) 9));
}
public void testMin_noArgs() {
try {
Ints.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, Ints.min(LEAST));
assertEquals(GREATEST, Ints.min(GREATEST));
assertEquals((int) 0, Ints.min(
(int) 8, (int) 6, (int) 7,
(int) 5, (int) 3, (int) 0, (int) 9));
}
public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Ints.concat()));
assertTrue(Arrays.equals(EMPTY, Ints.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Ints.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Ints.concat(ARRAY1)));
assertNotSame(ARRAY1, Ints.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Ints.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(Arrays.equals(
new int[] {(int) 1, (int) 1, (int) 1},
Ints.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(Arrays.equals(
new int[] {(int) 1, (int) 2, (int) 3, (int) 4},
Ints.concat(ARRAY1, ARRAY234)));
}
@GwtIncompatible("Ints.toByteArray")
public void testToByteArray() {
assertTrue(Arrays.equals(
new byte[] {0x12, 0x13, 0x14, 0x15}, Ints.toByteArray(0x12131415)));
assertTrue(Arrays.equals(
new byte[] {(byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC},
Ints.toByteArray(0xFFEEDDCC)));
}
@GwtIncompatible("Ints.fromByteArray")
public void testFromByteArray() {
assertEquals(0x12131415,
Ints.fromByteArray(new byte[] {0x12, 0x13, 0x14, 0x15, 0x33}));
assertEquals(0xFFEEDDCC, Ints.fromByteArray(
new byte[] {(byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC}));
try {
Ints.fromByteArray(new byte[Ints.BYTES - 1]);
fail();
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible("Ints.fromBytes")
public void testFromBytes() {
assertEquals(0x12131415, Ints.fromBytes(
(byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15));
assertEquals(0xFFEEDDCC, Ints.fromBytes(
(byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC));
}
@GwtIncompatible("Ints.fromByteArray, Ints.toByteArray")
public void testByteArrayRoundTrips() {
Random r = new Random(5);
byte[] b = new byte[Ints.BYTES];
// total overkill, but, it takes 0.1 sec so why not...
for (int i = 0; i < 10000; i++) {
int num = r.nextInt();
assertEquals(num, Ints.fromByteArray(Ints.toByteArray(num)));
r.nextBytes(b);
assertTrue(Arrays.equals(b, Ints.toByteArray(Ints.fromByteArray(b))));
}
}
public void testEnsureCapacity() {
assertSame(EMPTY, Ints.ensureCapacity(EMPTY, 0, 1));
assertSame(ARRAY1, Ints.ensureCapacity(ARRAY1, 0, 1));
assertSame(ARRAY1, Ints.ensureCapacity(ARRAY1, 1, 1));
assertTrue(Arrays.equals(
new int[] {(int) 1, (int) 0, (int) 0},
Ints.ensureCapacity(ARRAY1, 2, 1)));
}
public void testEnsureCapacity_fail() {
try {
Ints.ensureCapacity(ARRAY1, -1, 1);
fail();
} catch (IllegalArgumentException expected) {
}
try {
// notice that this should even fail when no growth was needed
Ints.ensureCapacity(ARRAY1, 1, -1);
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testJoin() {
assertEquals("", Ints.join(",", EMPTY));
assertEquals("1", Ints.join(",", ARRAY1));
assertEquals("1,2", Ints.join(",", (int) 1, (int) 2));
assertEquals("123",
Ints.join("", (int) 1, (int) 2, (int) 3));
}
public void testLexicographicalComparator() {
List<int[]> ordered = Arrays.asList(
new int[] {},
new int[] {LEAST},
new int[] {LEAST, LEAST},
new int[] {LEAST, (int) 1},
new int[] {(int) 1},
new int[] {(int) 1, LEAST},
new int[] {GREATEST, GREATEST - (int) 1},
new int[] {GREATEST, GREATEST},
new int[] {GREATEST, GREATEST, GREATEST});
Comparator<int[]> comparator = Ints.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
@GwtIncompatible("SerializableTester")
public void testLexicographicalComparatorSerializable() {
Comparator<int[]> comparator = Ints.lexicographicalComparator();
assertSame(comparator, SerializableTester.reserialize(comparator));
}
public void testToArray() {
// need explicit type parameter to avoid javac warning!?
List<Integer> none = Arrays.<Integer>asList();
assertTrue(Arrays.equals(EMPTY, Ints.toArray(none)));
List<Integer> one = Arrays.asList((int) 1);
assertTrue(Arrays.equals(ARRAY1, Ints.toArray(one)));
int[] array = {(int) 0, (int) 1, (int) 0xdeadbeef};
List<Integer> three = Arrays.asList((int) 0, (int) 1, (int) 0xdeadbeef);
assertTrue(Arrays.equals(array, Ints.toArray(three)));
assertTrue(Arrays.equals(array, Ints.toArray(Ints.asList(array))));
}
public void testToArray_threadSafe() {
for (int delta : new int[] { +1, 0, -1 }) {
for (int i = 0; i < VALUES.length; i++) {
List<Integer> list = Ints.asList(VALUES).subList(0, i);
Collection<Integer> misleadingSize =
Helpers.misleadingSizeCollection(delta);
misleadingSize.addAll(list);
int[] arr = Ints.toArray(misleadingSize);
assertEquals(i, arr.length);
for (int j = 0; j < i; j++) {
assertEquals(VALUES[j], arr[j]);
}
}
}
}
public void testToArray_withNull() {
List<Integer> list = Arrays.asList((int) 0, (int) 1, null);
try {
Ints.toArray(list);
fail();
} catch (NullPointerException expected) {
}
}
public void testToArray_withConversion() {
int[] array = {0, 1, 2};
List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2);
List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2);
List<Integer> ints = Arrays.asList(0, 1, 2);
List<Float> floats = Arrays.asList((float) 0, (float) 1, (float) 2);
List<Long> longs = Arrays.asList((long) 0, (long) 1, (long) 2);
List<Double> doubles = Arrays.asList((double) 0, (double) 1, (double) 2);
assertTrue(Arrays.equals(array, Ints.toArray(bytes)));
assertTrue(Arrays.equals(array, Ints.toArray(shorts)));
assertTrue(Arrays.equals(array, Ints.toArray(ints)));
assertTrue(Arrays.equals(array, Ints.toArray(floats)));
assertTrue(Arrays.equals(array, Ints.toArray(longs)));
assertTrue(Arrays.equals(array, Ints.toArray(doubles)));
}
public void testAsList_isAView() {
int[] array = {(int) 0, (int) 1};
List<Integer> list = Ints.asList(array);
list.set(0, (int) 2);
assertTrue(Arrays.equals(new int[] {(int) 2, (int) 1}, array));
array[1] = (int) 3;
assertEquals(Arrays.asList((int) 2, (int) 3), list);
}
public void testAsList_toArray_roundTrip() {
int[] array = { (int) 0, (int) 1, (int) 2 };
List<Integer> list = Ints.asList(array);
int[] newArray = Ints.toArray(list);
// Make sure it returned a copy
list.set(0, (int) 4);
assertTrue(Arrays.equals(
new int[] { (int) 0, (int) 1, (int) 2 }, newArray));
newArray[1] = (int) 5;
assertEquals((int) 1, (int) list.get(1));
}
// This test stems from a real bug found by andrewk
public void testAsList_subList_toArray_roundTrip() {
int[] array = { (int) 0, (int) 1, (int) 2, (int) 3 };
List<Integer> list = Ints.asList(array);
assertTrue(Arrays.equals(new int[] { (int) 1, (int) 2 },
Ints.toArray(list.subList(1, 3))));
assertTrue(Arrays.equals(new int[] {},
Ints.toArray(list.subList(2, 2))));
}
public void testAsListEmpty() {
assertSame(Collections.emptyList(), Ints.asList(EMPTY));
}
@GwtIncompatible("NullPointerTester")
public void testNulls() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(int[].class, new int[0]);
tester.testAllPublicStaticMethods(Ints.class);
}
@GwtIncompatible("AndroidInteger")
public void testTryParse() {
tryParseAndAssertEquals(0, "0");
tryParseAndAssertEquals(0, "-0");
tryParseAndAssertEquals(1, "1");
tryParseAndAssertEquals(-1, "-1");
tryParseAndAssertEquals(8900, "8900");
tryParseAndAssertEquals(-8900, "-8900");
tryParseAndAssertEquals(GREATEST, Integer.toString(GREATEST));
tryParseAndAssertEquals(LEAST, Integer.toString(LEAST));
assertNull(Ints.tryParse(""));
assertNull(Ints.tryParse("-"));
assertNull(Ints.tryParse("+1"));
assertNull(Ints.tryParse("9999999999999999"));
assertNull("Max integer + 1",
Ints.tryParse(Long.toString(((long) GREATEST) + 1)));
assertNull("Min integer - 1",
Ints.tryParse(Long.toString(((long) LEAST) - 1)));
}
/**
* Applies {@link Ints#tryParse(String)} to the given string and asserts that
* the result is as expected.
*/
@GwtIncompatible("AndroidInteger")
private static void tryParseAndAssertEquals(Integer expected, String value) {
assertEquals(expected, Ints.tryParse(value));
}
}