310 lines
11 KiB
Java
310 lines
11 KiB
Java
/*
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* Copyright (c) 2009, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6797535 6889858 6891113 8013712 8011800 8014365 8280168
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* @summary Basic tests for methods in java.util.Objects
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*/
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import java.util.*;
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import java.util.function.*;
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public class BasicObjectsTest {
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public static void main(String... args) {
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int errors = 0;
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errors += testEquals();
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errors += testDeepEquals();
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errors += testHashCode();
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errors += testHash();
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errors += testToString();
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errors += testToString2();
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errors += testToIdentityString();
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errors += testCompare();
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errors += testRequireNonNull();
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errors += testIsNull();
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errors += testNonNull();
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errors += testNonNullOf();
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if (errors > 0 )
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throw new RuntimeException();
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}
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private static int testEquals() {
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int errors = 0;
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Object[] values = {null, "42", 42};
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for(int i = 0; i < values.length; i++)
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for(int j = 0; j < values.length; j++) {
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boolean expected = (i == j);
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Object a = values[i];
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Object b = values[j];
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boolean result = Objects.equals(a, b);
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if (result != expected) {
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errors++;
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System.err.printf("When equating %s to %s, got %b instead of %b%n.",
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a, b, result, expected);
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}
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}
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return errors;
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}
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private static int testDeepEquals() {
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int errors = 0;
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Object[] values = {null,
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null, // Change to values later
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new byte[] {(byte)1},
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new short[] {(short)1},
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new int[] {1},
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new long[] {1L},
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new char[] {(char)1},
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new float[] {1.0f},
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new double[]{1.0d},
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new String[]{"one"}};
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values[1] = values;
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for(int i = 0; i < values.length; i++)
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for(int j = 0; j < values.length; j++) {
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boolean expected = (i == j);
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Object a = values[i];
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Object b = values[j];
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boolean result = Objects.deepEquals(a, b);
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if (result != expected) {
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errors++;
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System.err.printf("When equating %s to %s, got %b instead of %b%n.",
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a, b, result, expected);
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}
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}
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return errors;
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}
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private static int testHashCode() {
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int errors = 0;
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errors += (Objects.hashCode(null) == 0 ) ? 0 : 1;
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String s = "42";
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errors += (Objects.hashCode(s) == s.hashCode() ) ? 0 : 1;
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return errors;
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}
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private static int testHash() {
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int errors = 0;
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Object[] data = new String[]{"perfect", "ham", "THC"};
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errors += ((Objects.hash((Object[])null) == 0) ? 0 : 1);
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errors += (Objects.hash("perfect", "ham", "THC") ==
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Arrays.hashCode(data)) ? 0 : 1;
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return errors;
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}
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private static int testToString() {
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int errors = 0;
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errors += ("null".equals(Objects.toString(null)) ) ? 0 : 1;
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String s = "Some string";
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errors += (s.equals(Objects.toString(s)) ) ? 0 : 1;
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return errors;
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}
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private static int testToString2() {
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int errors = 0;
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String s = "not the default";
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errors += (s.equals(Objects.toString(null, s)) ) ? 0 : 1;
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errors += (s.equals(Objects.toString(s, "another string")) ) ? 0 : 1;
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return errors;
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}
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private static int testToIdentityString() {
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int errors = 0;
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// Test null behavior
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try {
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Objects.toIdentityString(null);
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errors++;
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} catch (NullPointerException npe) {
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; // Expected
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}
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// Behavior on typical objects
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Object o = new Object(){};
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errors += (Objects.toIdentityString(o).equals(o.toString()))? 0 : 1;
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// Verify object's toString *not* called
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Object badToString = new Object() {
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@Override
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public String toString() {
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throw new RuntimeException();
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}
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};
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Objects.toIdentityString(badToString);
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// Verify object's hashCode *not* called
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Object badHashCode = new Object() {
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@Override
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public int hashCode() {
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throw new RuntimeException("0xDEADBEFF");
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}
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};
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Objects.toIdentityString(badHashCode);
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return errors;
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}
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private static int testCompare() {
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int errors = 0;
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String[] values = {"e. e. cummings", "zzz"};
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String[] VALUES = {"E. E. Cummings", "ZZZ"};
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errors += compareTest(null, null, 0);
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for(int i = 0; i < values.length; i++) {
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String a = values[i];
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errors += compareTest(a, a, 0);
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for(int j = 0; j < VALUES.length; j++) {
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int expected = Integer.compare(i, j);
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String b = VALUES[j];
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errors += compareTest(a, b, expected);
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}
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}
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return errors;
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}
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private static int compareTest(String a, String b, int expected) {
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int errors = 0;
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int result = Objects.compare(a, b, String.CASE_INSENSITIVE_ORDER);
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if (Integer.signum(result) != Integer.signum(expected)) {
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errors++;
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System.err.printf("When comparing %s to %s, got %d instead of %d%n.",
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a, b, result, expected);
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}
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return errors;
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}
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private static int testRequireNonNull() {
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int errors = 0;
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final String RNN_1 = "1-arg requireNonNull";
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final String RNN_2 = "2-arg requireNonNull";
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final String RNN_3 = "Supplier requireNonNull";
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Function<String, String> rnn1 = s -> Objects.requireNonNull(s);
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Function<String, String> rnn2 = s -> Objects.requireNonNull(s, "trousers");
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Function<String, String> rnn3 = s -> Objects.requireNonNull(s, () -> "trousers");
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errors += testRNN_NonNull(rnn1, RNN_1);
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errors += testRNN_NonNull(rnn2, RNN_2);
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errors += testRNN_NonNull(rnn3, RNN_3);
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errors += testRNN_Null(rnn1, RNN_1, null);
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errors += testRNN_Null(rnn2, RNN_2, "trousers");
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errors += testRNN_Null(rnn3, RNN_3, "trousers");
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return errors;
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}
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private static int testRNN_NonNull(Function<String, String> testFunc,
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String testFuncName) {
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int errors = 0;
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try {
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String s = testFunc.apply("pants");
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if (s != "pants") {
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System.err.printf(testFuncName + " failed to return its arg");
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errors++;
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}
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} catch (NullPointerException e) {
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System.err.printf(testFuncName + " threw unexpected NPE");
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errors++;
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}
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return errors;
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}
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private static int testRNN_Null(Function<String, String> testFunc,
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String testFuncName,
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String expectedMessage) {
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int errors = 0;
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try {
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String s = testFunc.apply(null);
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System.err.printf(testFuncName + " failed to throw NPE");
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errors++;
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} catch (NullPointerException e) {
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if (e.getMessage() != expectedMessage) {
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System.err.printf(testFuncName + " threw NPE w/ bad detail msg");
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errors++;
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}
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}
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return errors;
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}
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private static int testIsNull() {
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int errors = 0;
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errors += Objects.isNull(null) ? 0 : 1;
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errors += Objects.isNull(Objects.class) ? 1 : 0;
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return errors;
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}
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private static int testNonNull() {
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int errors = 0;
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errors += Objects.nonNull(null) ? 1 : 0;
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errors += Objects.nonNull(Objects.class) ? 0 : 1;
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return errors;
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}
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private static int testNonNullOf() {
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int errors = 0;
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String defString = new String("default");
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String nullString = null;
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String nonNullString = "non-null";
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// Confirm the compile time return type matches
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String result = Objects.requireNonNullElse(nullString, defString);
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errors += (result == defString) ? 0 : 1;
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errors += (Objects.requireNonNullElse(nonNullString, defString) == nonNullString) ? 0 : 1;
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errors += (Objects.requireNonNullElse(nonNullString, null) == nonNullString) ? 0 : 1;
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try {
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Objects.requireNonNullElse(null, null);
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errors += 1;
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} catch (NullPointerException npe) {
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// expected
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errors += npe.getMessage().equals("defaultObj") ? 0 : 1;
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}
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// Test requireNonNullElseGet with a supplier
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errors += (Objects.requireNonNullElseGet(nullString, () -> defString) == defString) ? 0 : 1;
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errors += (Objects.requireNonNullElseGet(nonNullString, () -> defString) == nonNullString) ? 0 : 1;
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errors += (Objects.requireNonNullElseGet(nonNullString, () -> null) == nonNullString) ? 0 : 1;
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try {
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Objects.requireNonNullElseGet(null, () -> null);
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errors += 1;
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} catch (NullPointerException npe) {
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// expected
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errors += npe.getMessage().equals("supplier.get()") ? 0 : 1;
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}
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try { // supplier is null
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Objects.requireNonNullElseGet(null, null);
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errors += 1;
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} catch (NullPointerException npe) {
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// expected
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errors += npe.getMessage().equals("supplier") ? 0 : 1;
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}
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return errors;
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}
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}
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