/*

 * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 6797535 6889858 6891113 8013712 8011800 8014365

 * @summary Basic tests for methods in java.util.Objects

 * @author  Joseph D. Darcy

 */

import java.util.*;

import java.util.function.*;

public class BasicObjectsTest {

    public static void main(String... args) {

        int errors = 0;

        errors += testEquals();

        errors += testDeepEquals();

        errors += testHashCode();

        errors += testHash();

        errors += testToString();

        errors += testToString2();

        errors += testCompare();

        errors += testRequireNonNull();

        errors += testIsNull();

        errors += testNonNull();

        errors += testNonNullOf();

        if (errors > 0 )

            throw new RuntimeException();

    }

    private static int testEquals() {

        int errors = 0;

        Object[] values = {null, "42", 42};

        for(int i = 0; i < values.length; i++)

            for(int j = 0; j < values.length; j++) {

                boolean expected = (i == j);

                Object a = values[i];

                Object b = values[j];

                boolean result = Objects.equals(a, b);

                if (result != expected) {

                    errors++;

                    System.err.printf("When equating %s to %s, got %b instead of %b%n.",

                                      a, b, result, expected);

                }

            }

        return errors;

    }

    private static int testDeepEquals() {

        int errors = 0;

        Object[] values = {null,

                           null, // Change to values later

                           new byte[]  {(byte)1},

                           new short[] {(short)1},

                           new int[]   {1},

                           new long[]  {1L},

                           new char[]  {(char)1},

                           new float[] {1.0f},

                           new double[]{1.0d},

                           new String[]{"one"}};

        values[1] = values;

        for(int i = 0; i < values.length; i++)

            for(int j = 0; j < values.length; j++) {

                boolean expected = (i == j);

                Object a = values[i];

                Object b = values[j];

                boolean result = Objects.deepEquals(a, b);

                if (result != expected) {

                    errors++;

                    System.err.printf("When equating %s to %s, got %b instead of %b%n.",

                                      a, b, result, expected);

                }

            }

        return errors;

    }

    private static int testHashCode() {

        int errors = 0;

        errors += (Objects.hashCode(null) == 0 ) ? 0 : 1;

        String s = "42";

        errors += (Objects.hashCode(s) == s.hashCode() ) ? 0 : 1;

        return errors;

    }

    private static int testHash() {

        int errors = 0;

        Object[] data = new String[]{"perfect", "ham", "THC"};

        errors += ((Objects.hash((Object[])null) == 0) ? 0 : 1);

        errors += (Objects.hash("perfect", "ham", "THC") ==

                   Arrays.hashCode(data)) ? 0 : 1;

        return errors;

    }

    private static int testToString() {

        int errors = 0;

        errors += ("null".equals(Objects.toString(null)) ) ? 0 : 1;

        String s = "Some string";

        errors += (s.equals(Objects.toString(s)) ) ? 0 : 1;

        return errors;

    }

    private static int testToString2() {

        int errors = 0;

        String s = "not the default";

        errors += (s.equals(Objects.toString(null, s)) ) ? 0 : 1;

        errors += (s.equals(Objects.toString(s, "another string")) ) ? 0 : 1;

        return errors;

    }

    private static int testCompare() {

        int errors = 0;

        String[] values = {"e. e. cummings", "zzz"};

        String[] VALUES = {"E. E. Cummings", "ZZZ"};

        errors += compareTest(null, null, 0);

        for(int i = 0; i < values.length; i++) {

            String a = values[i];

            errors += compareTest(a, a, 0);

            for(int j = 0; j < VALUES.length; j++) {

                int expected = Integer.compare(i, j);

                String b = VALUES[j];

                errors += compareTest(a, b, expected);

            }

        }

        return errors;

    }

    private static int compareTest(String a, String b, int expected) {

        int errors = 0;

        int result = Objects.compare(a, b, String.CASE_INSENSITIVE_ORDER);

        if (Integer.signum(result) != Integer.signum(expected)) {

            errors++;

            System.err.printf("When comparing %s to %s, got %d instead of %d%n.",

                              a, b, result, expected);

        }

        return errors;

    }

    private static int testRequireNonNull() {

        int errors = 0;

        final String RNN_1 = "1-arg requireNonNull";

        final String RNN_2 = "2-arg requireNonNull";

        final String RNN_3 = "Supplier requireNonNull";

        Function<String, String> rnn1 = s -> Objects.requireNonNull(s);

        Function<String, String> rnn2 = s -> Objects.requireNonNull(s, "trousers");

        Function<String, String> rnn3 = s -> Objects.requireNonNull(s, () -> "trousers");

        errors += testRNN_NonNull(rnn1, RNN_1);

        errors += testRNN_NonNull(rnn2, RNN_2);

        errors += testRNN_NonNull(rnn3, RNN_3);

        errors += testRNN_Null(rnn1, RNN_1, null);

        errors += testRNN_Null(rnn2, RNN_2, "trousers");

        errors += testRNN_Null(rnn3, RNN_3, "trousers");

        return errors;

    }

    private static int testRNN_NonNull(Function<String, String> testFunc,

                                       String testFuncName) {

        int errors = 0;

        try {

            String s = testFunc.apply("pants");

            if (s != "pants") {

                System.err.printf(testFuncName + " failed to return its arg");

                errors++;

            }

        } catch (NullPointerException e) {

            System.err.printf(testFuncName + " threw unexpected NPE");

            errors++;

        }

        return errors;

    }

    private static int testRNN_Null(Function<String, String> testFunc,

                                    String testFuncName,

                                    String expectedMessage) {

        int errors = 0;

        try {

            String s = testFunc.apply(null);

            System.err.printf(testFuncName + " failed to throw NPE");

            errors++;

        } catch (NullPointerException e) {

            if (e.getMessage() != expectedMessage) {

                System.err.printf(testFuncName + " threw NPE w/ bad detail msg");

                errors++;

            }

        }

        return errors;

    }

    private static int testIsNull() {

        int errors = 0;

        errors += Objects.isNull(null) ? 0 : 1;

        errors += Objects.isNull(Objects.class) ? 1 : 0;

        return errors;

    }

    private static int testNonNull() {

        int errors = 0;

        errors += Objects.nonNull(null) ? 1 : 0;

        errors += Objects.nonNull(Objects.class) ? 0 : 1;

        return errors;

    }

    private static int testNonNullOf() {

        int errors = 0;

        String defString = new String("default");

        String nullString = null;

        String nonNullString = "non-null";

        // Confirm the compile time return type matches

        String result = Objects.requireNonNullElse(nullString, defString);

        errors += (result == defString) ? 0 : 1;

        errors += (Objects.requireNonNullElse(nonNullString, defString) == nonNullString) ? 0 : 1;

        errors += (Objects.requireNonNullElse(nonNullString, null) == nonNullString) ? 0 : 1;

        try {

            Objects.requireNonNullElse(null, null);

            errors += 1;

        } catch (NullPointerException npe) {

            // expected

            errors += npe.getMessage().equals("defaultObj") ? 0 : 1;

        }

        // Test requireNonNullElseGet with a supplier

        errors += (Objects.requireNonNullElseGet(nullString, () -> defString) == defString) ? 0 : 1;

        errors += (Objects.requireNonNullElseGet(nonNullString, () -> defString) == nonNullString) ? 0 : 1;

        errors += (Objects.requireNonNullElseGet(nonNullString, () -> null) == nonNullString) ? 0 : 1;

        try {

            Objects.requireNonNullElseGet(null, () -> null);

            errors += 1;

        } catch (NullPointerException npe) {

            // expected

            errors += npe.getMessage().equals("supplier.get()") ? 0 : 1;

        }

        try {       // supplier is null

            Objects.requireNonNullElseGet(null, null);

            errors += 1;

        } catch (NullPointerException npe) {

            // expected

            errors += npe.getMessage().equals("supplier") ? 0 : 1;

        }

        return errors;

    }

}