1 /*

     2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 7000511

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

    28  *          exception thrown

    29  */

    30 

    31 import java.io.File;

    32 import java.io.FileInputStream;

    33 import java.io.FileOutputStream;

    34 import java.io.FileNotFoundException;

    35 import java.io.IOException;

    36 import java.util.Scanner;

    37 

    38 public class FailingConstructors {

    39     static final String fileName = "FailingConstructorsTest";

    40     static final String UNSUPPORTED_CHARSET = "unknownCharset";

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

    42 

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

    44         test(false, new File(fileName));

    45 

    46         /* create the file and write its contents */

    47         File file = File.createTempFile(fileName, null);

    48         file.deleteOnExit();

    49         FileOutputStream fos = new FileOutputStream(file);

    50         fos.write(FILE_CONTENTS.getBytes());

    51         fos.close();

    52 

    53         test(true, file);

    54         file.delete();

    55     }

    56 

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

    58         /* Scanner(File source, String charsetName) */

    59         try {

    60             new Scanner(file, UNSUPPORTED_CHARSET);

    61             fail();

    62         } catch(FileNotFoundException|IllegalArgumentException e) {

    63             pass();

    64         }

    65 

    66         check(exists, file);

    67 

    68         try {

    69             new Scanner(file, null);

    70             fail();

    71         } catch(FileNotFoundException|NullPointerException e) {

    72             pass();

    73         }

    74 

    75         check(exists, file);

    76 

    77         /* Scanner(FileRef source, String charsetName) */

    78         try {

    79             new Scanner(file.toPath(), UNSUPPORTED_CHARSET);

    80             fail();

    81         } catch(FileNotFoundException|IllegalArgumentException  e) {

    82             pass();

    83         }

    84 

    85         check(exists, file);

    86 

    87         try {

    88             new Scanner(file.toPath(), null);

    89             fail();

    90         } catch(FileNotFoundException|NullPointerException e) {

    91             pass();

    92         }

    93 

    94         check(exists, file);

    95     }

    96 

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

    98         if (exists) {

    99             /* the file should be unchanged */

   100             verifyContents(file);

   101         } else {

   102             /* the file should not have been created */

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

   104         }

   105     }

   106 

   107     private static void verifyContents(File file) {

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

   109             byte[] contents = FILE_CONTENTS.getBytes();

   110             int read, count = 0;

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

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

   113                     fail("file contents have been altered");

   114                     return;

   115                 }

   116             }

   117         } catch (IOException ioe) {

   118             unexpected(ioe);

   119         }

   120     }

   121 

   122     //--------------------- Infrastructure ---------------------------

   123     static volatile int passed = 0, failed = 0;

   124     static void pass() {passed++;}

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

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

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

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

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

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

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

   132 }