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.io.UnsupportedEncodingException;

    37 import java.util.Formatter;

    38 

    39 public class FailingConstructors {

    40     static final String fileName = "FailingConstructorsTest";

    41     static final String UNSUPPORTED_CHARSET = "unknownCharset";

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

    43 

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

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

    46 

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

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

    49         file.deleteOnExit();

    50         FileOutputStream fos = new FileOutputStream(file);

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

    52         fos.close();

    53 

    54         test(true, file);

    55         file.delete();

    56     }

    57 

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

    59         /* Formatter(File file, String csn) */

    60         try {

    61             new Formatter(file, UNSUPPORTED_CHARSET);

    62             fail();

    63         } catch(FileNotFoundException|UnsupportedEncodingException e) {

    64             pass();

    65         }

    66 

    67         check(exists, file);

    68 

    69         try {

    70             new Formatter(file, null);

    71             fail();

    72         } catch(FileNotFoundException|NullPointerException e) {

    73             pass();

    74         }

    75 

    76         check(exists, file);

    77 

    78         /* Formatter(String fileName, String csn)  */

    79         try {

    80             new Formatter(file.getName(), UNSUPPORTED_CHARSET);

    81             fail();

    82         } catch(FileNotFoundException|UnsupportedEncodingException e) {

    83             pass();

    84         }

    85 

    86         check(exists, file);

    87 

    88         try {

    89             new Formatter(file.getName(), null);

    90             fail();

    91         } catch(FileNotFoundException|NullPointerException e) {

    92             pass();

    93         }

    94 

    95         check(exists, file);

    96     }

    97 

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

    99         if (exists) {

   100             /* the file should be unchanged */

   101             verifyContents(file);

   102         } else {

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

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

   105         }

   106     }

   107 

   108     private static void verifyContents(File file) {

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

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

   111             int read, count = 0;

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

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

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

   115                     return;

   116                 }

   117             }

   118         } catch (IOException ioe) {

   119             unexpected(ioe);

   120         }

   121     }

   122 

   123     //--------------------- Infrastructure ---------------------------

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

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

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

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

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

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

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

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

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

   133 }