/*

 * Copyright (c) 2011, 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 7020047

 * @summary Test null handling of try-with-resources statement

 */

public class TwrNullTests {

    /*

     * Each try-with-resources statement generates two calls to the

     * close method for each resource: one for when there is a primary

     * exception present and the second for when a primary exception

     * is absent.  The null handling of both cases needs to be

     * checked.

     */

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

        testNormalCompletion();

        testNoSuppression();

    }

    /*

     * Verify empty try-with-resources on a null resource completes

     * normally; no NPE from the generated close call.

     */

    private static void testNormalCompletion() {

        try(AutoCloseable resource = null) {

            return; // Nothing to see here, move along.

        } catch (Exception e) {

            throw new AssertionError("Should not be reached", e);

        }

    }

    /*

     * Verify that a NPE on a null resource is <em>not</em> added as a

     * suppressed exception to an exception from try block.

     */

    private static void testNoSuppression() {

        try(AutoCloseable resource = null) {

            throw new java.io.IOException();

        } catch(java.io.IOException ioe) {

            Throwable[] suppressed = ioe.getSuppressed();

            if (suppressed.length != 0) {

                throw new AssertionError("Non-empty suppressed exceptions",

                                         ioe);

            }

        } catch (Exception e) {

            throw new AssertionError("Should not be reached", e);

        }

    }

}