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.PrintStream;
  37 import java.io.UnsupportedEncodingException;
  38 import java.nio.file.Files;
  39 import java.nio.file.Path;
  40 
  41 public class FailingConstructors {
  42     static final String fileName = "FailingConstructorsTest";
  43     static final String UNSUPPORTED_CHARSET = "unknownCharset";
  44     static final String FILE_CONTENTS = "This is a small file!";
  45 
  46     private static void realMain(String[] args) throws Throwable {
  47         test(false, new File(fileName));
  48 
  49         /* create the file and write its contents */
  50         Path path = Files.createTempFile(fileName, null);
  51         try {
  52             Files.write(path, FILE_CONTENTS.getBytes());
  53             test(true, path.toFile());
  54         } finally {
  55             Files.delete(path);
  56         }
  57     }
  58 
  59     private static void test(boolean exists, File file) throws Throwable {
  60         /* PrintStream(File file, String csn) */
  61         try {
  62             new PrintStream(file, UNSUPPORTED_CHARSET);
  63             fail();
  64         } catch(FileNotFoundException|UnsupportedEncodingException e) {
  65             pass();
  66         }
  67 
  68         check(exists, file);
  69 
  70         try {
  71             new PrintStream(file, null);
  72             fail();
  73         } catch(FileNotFoundException|NullPointerException e) {
  74             pass();
  75         }
  76 
  77         check(exists, file);
  78 
  79         /* PrintStream(String fileName, String csn)  */
  80         try {
  81             new PrintStream(file.getName(), UNSUPPORTED_CHARSET);
  82             fail();
  83         } catch(FileNotFoundException|UnsupportedEncodingException e) {
  84             pass();
  85         }
  86 
  87         check(exists, file);
  88 
  89         try {
  90             new PrintStream(file.getName(), null);
  91             fail();
  92         } catch(FileNotFoundException|NullPointerException e) {
  93             pass();
  94         }
  95 
  96         check(exists, file);
  97     }
  98 
  99     private static void check(boolean exists, File file) {
 100         if (exists) {
 101             /* the file should be unchanged */
 102             verifyContents(file);
 103         } else {
 104             /* the file should not have been created */
 105             if (file.exists()) { fail(file + " should not have been created"); }
 106         }
 107     }
 108 
 109     private static void verifyContents(File file) {
 110         try (FileInputStream fis = new FileInputStream(file)) {
 111             byte[] contents = FILE_CONTENTS.getBytes();
 112             int read, count = 0;
 113             while ((read = fis.read()) != -1) {
 114                 if (read != contents[count++])  {
 115                     fail("file contents have been altered");
 116                     return;
 117                 }
 118             }
 119         } catch (IOException ioe) {
 120             unexpected(ioe);
 121         }
 122     }
 123 
 124     //--------------------- Infrastructure ---------------------------
 125     static volatile int passed = 0, failed = 0;
 126     static void pass() {passed++;}
 127     static void fail() {failed++; Thread.dumpStack();}
 128     static void fail(String message) {System.out.println(message); fail(); }
 129     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
 130     public static void main(String[] args) throws Throwable {
 131         try {realMain(args);} catch (Throwable t) {unexpected(t);}
 132         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
 133         if (failed > 0) throw new AssertionError("Some tests failed");}
 134 }