/*

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 * 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.

 *

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/*

 * @test

 * @summary com.sun.tools.util.List.toArray violates Collection spec

 * @modules jdk.compiler/com.sun.tools.javac.util

 */

import com.sun.tools.javac.util.List;

public class T6238612 {

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

        new T6238612().test();

    }

    boolean error = false;

    // exercise the List.toArray method for a variety of lists

    void test() {

        test(List.<String>nil());

        test(List.of("a"));

        test(List.of("a", "b", "c"));

        test(List.of("a", "b", "c", "d", "e", "f"));

        if (error)

            throw new Error("test failed");

    }

    // given a list, exercise the List.toArray method for a variety of arrays

    void test(List<String> list) {

        int n = list.size();

        if (n > 0)

            test(list, new String[0]);

        if (n > 1)

            test(list, new String[n - 1]);

        test(list, new String[n]);

        test(list, new String[n + 1]);

        test(list, new String[n + 5]);

    }

    // test the List.toArray method for a particular list and array

    void test(List<String> list, String[] array) {

        String[] result = list.toArray(array);

        if (result.length < list.size()) {

            error("returned array is too small; expected: " + list.size() + ", found: " + result.length);

            return;

        }

        if (list.size() <= array.length && result != array)

            error("new array wrongly created");

        int i = 0;

        for (String s: list)

            check(result, i++, s);

        if (i < result.length)

            check(result, i, null);

    }

    // check a specific element of an array

    void check(String[] array, int i, String expected) {

        if (!equal(array[i], expected))

                error("element " + i + " incorrect; expected: " + str(expected) + ", found: " + str(array[i]));

    }

    // check if two strings are both null or are equal

    boolean equal(String s1, String s2) {

        return (s1 == null ? s2 == null : s1.equals(s2));

    }

    String str(String s) {

        return (s == null ? "null" : '"' + s + '"');

    }

    void error(String message) {

        System.err.println(message);

        error = true;

    }

}