/*

 * 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

 * @summary PrintStream, PrintWriter, Formatter, Scanner leave files open when

 *          exception thrown

 */

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PrintStream;

import java.io.UnsupportedEncodingException;

import java.nio.file.Files;

import java.nio.file.Path;

public class FailingConstructors {

    static final String fileName = "FailingConstructorsTest";

    static final String UNSUPPORTED_CHARSET = "unknownCharset";

    static final String FILE_CONTENTS = "This is a small file!";

    private static void realMain(String[] args) throws Throwable {

        test(false, new File(fileName));

        /* create the file and write its contents */

        Path path = Files.createTempFile(fileName, null);

        try {

            Files.write(path, FILE_CONTENTS.getBytes());

            test(true, path.toFile());

        } finally {

            Files.delete(path);

        }

    }

    private static void test(boolean exists, File file) throws Throwable {

        /* PrintStream(File file, String csn) */

        try {

            new PrintStream(file, UNSUPPORTED_CHARSET);

            fail();

        } catch(FileNotFoundException|UnsupportedEncodingException e) {

            pass();

        }

        check(exists, file);

        try {

            fail();

        } catch(FileNotFoundException|NullPointerException e) {

            pass();

        }

        check(exists, file);

        /* PrintStream(String fileName, String csn)  */

        try {

            new PrintStream(file.getName(), UNSUPPORTED_CHARSET);

            fail();

        } catch(FileNotFoundException|UnsupportedEncodingException e) {

            pass();

        }

        check(exists, file);

        try {

            fail();

        } catch(FileNotFoundException|NullPointerException e) {

            pass();

        }

        check(exists, file);

    }

    private static void check(boolean exists, File file) {

        if (exists) {

            /* the file should be unchanged */

            verifyContents(file);

        } else {

            /* the file should not have been created */

            if (file.exists()) { fail(file + " should not have been created"); }

        }

    }

    private static void verifyContents(File file) {

        try (FileInputStream fis = new FileInputStream(file)) {

            byte[] contents = FILE_CONTENTS.getBytes();

            int read, count = 0;

            while ((read = fis.read()) != -1) {

                if (read != contents[count++])  {

                    fail("file contents have been altered");

                    return;

                }

            }

        } catch (IOException ioe) {

            unexpected(ioe);

        }

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String message) {System.out.println(message); fail(); }

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

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

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}