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

 *

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

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 *

 * 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,

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 *

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 */

/**

 * @test

 * @bug 8216977

 * @summary Test null source file and negative line number from hidden frame produces correct output.

 * @library /test/lib

 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+ShowHiddenFrames HiddenFrameTest visible

 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:-ShowHiddenFrames HiddenFrameTest hidden

 */

import jdk.test.lib.Asserts;

public class HiddenFrameTest {

    @FunctionalInterface

    private static interface SomeFunctionalInterface {

        String someMethod(String a, String b);

    }

    static void assertContains(String expected, String actual, Exception e, boolean framesAreHidden) throws Exception {

        if (!framesAreHidden && !actual.contains(expected)) {

            throw new RuntimeException("Expected: " + expected + "; Actual: " + actual, e);

        } else if (framesAreHidden && actual.contains(expected)) {

            throw new RuntimeException("Unexpected: " + expected + "; Actual: " + actual, e);

        }

    }

    static void checkException(Exception e, boolean framesAreHidden) throws Exception {

        StackTraceElement[] fs = e.getStackTrace();

        if (fs.length < 2) {

            throw new RuntimeException("Exception should have at least two frames", e);

        }

        assertContains("someMethod(Unknown Source)", fs[0].toString(), e, framesAreHidden);

    }

    public static void main(String[] args) throws Exception {

        boolean framesAreHidden = false;

        if (args.length > 0) {

            String arg = args[0];

            if (arg.equals("hidden")) framesAreHidden = true;

        }

        try {

            final SomeFunctionalInterface concatter = String::concat;

            final String nullString = null;

            if (concatter != null) {

                // This throws NPE from the lambda expression which is a hidden frame

                concatter.someMethod(nullString, "validString");

            }

        } catch (NullPointerException e) {

            e.printStackTrace();

            checkException(e, framesAreHidden);

        }

    }

}