blob: b950c173433764893ebfb71c91cdcb3a7058f5c0 [file] [log] [blame]
// Copyright (c) 2023, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package backport;
import java.util.Objects;
public class ObjectsBackportJava17Main {
public static void main(String[] args) {
// The methods are actually from Java 16, but we can test them from Java 17.
testCheckIndex();
testCheckFromToIndex();
testCheckFromIndexSize();
}
private static void testCheckIndex() {
for (long i = 0L; i < 10L; i++) {
assertEquals(i, Objects.checkIndex(i, 10L));
}
try {
throw new AssertionError(Objects.checkIndex(-1L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkIndex(10L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkIndex(0L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
}
private static void testCheckFromToIndex() {
for (long i = 0L; i <= 10L; i++) {
for (long j = i; j <= 10L; j++) {
assertEquals(i, Objects.checkFromToIndex(i, j, 10L));
}
}
assertEquals(0L, Objects.checkFromToIndex(0L, 0L, 0L));
try {
throw new AssertionError(Objects.checkFromToIndex(4L, 2L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromToIndex(-1L, 5L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromToIndex(0L, -1L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromToIndex(11L, 11L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromToIndex(0L, 1L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromToIndex(1L, 1L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
}
private static void testCheckFromIndexSize() {
for (long i = 0L; i <= 10L; i++) {
for (long j = 10L - i; j >= 0L; j--) {
assertEquals(i, Objects.checkFromIndexSize(i, j, 10L));
}
}
assertEquals(0, Objects.checkFromIndexSize(0L, 0L, 0L));
try {
throw new AssertionError(Objects.checkFromIndexSize(8L, 4L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromIndexSize(-1L, 5L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromIndexSize(11L, 0L, 10L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromIndexSize(0L, 1L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromIndexSize(1L, 1L, 0L));
} catch (IndexOutOfBoundsException expected) {
}
// Check for cases where overflow might occur producing incorrect results.
try {
throw new AssertionError(Objects.checkFromIndexSize(Long.MAX_VALUE, 1L, Long.MAX_VALUE));
} catch (IndexOutOfBoundsException expected) {
}
try {
throw new AssertionError(Objects.checkFromIndexSize(0L, 1L, Long.MIN_VALUE));
} catch (IndexOutOfBoundsException expected) {
}
}
private static void assertEquals(long expected, long actual) {
if (expected != actual) {
throw new AssertionError("Expected <" + expected + "> but was <" + actual + '>');
}
}
}