/*

 * Copyright (c) 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

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 * questions.

 */

/*

 * @test

 * @bug 8020968

 * @summary Basic test for Stream<StackFrame> state

 * @run main StackStreamState

 */

import java.lang.StackWalker.StackFrame;

import java.util.stream.Stream;

public class StackStreamState {

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

        StackStreamState test = new StackStreamState();

        test.testStatic();

        test.testInstance();

        test.testLocal();

    }

    private static Stream<StackFrame> staticStream;

    private Stream<StackFrame> instanceStream;

    private final StackWalker walker = StackWalker.getInstance();

    void testStatic() {

        walker.walk(s -> {

            staticStream = s;

            return null;

        });

        checkStreamState(staticStream);

    }

    void testInstance() {

        walker.walk(s -> {

            instanceStream = s;

            return null;

        });

        checkStreamState(instanceStream);

    }

    void testLocal() {

        Stream<StackFrame> stream = walker.walk(s -> {

            return s;

        });

        checkStreamState(stream);

    }

    void checkStreamState(Stream<StackFrame> stream) {

        try {

            stream.count();

            throw new RuntimeException("IllegalStateException not thrown");

        } catch (IllegalStateException e) {

            System.out.println("Got expected IllegalStateException: " + e.getMessage());

            e.printStackTrace(System.out);

        }

    }

}