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 
realMain(String[] args)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 
test(boolean exists, File file)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 
check(boolean exists, File file)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 
verifyContents(File file)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;
pass()126     static void pass() {passed++;}
fail()127     static void fail() {failed++; Thread.dumpStack();}
fail(String message)128     static void fail(String message) {System.out.println(message); fail(); }
unexpected(Throwable t)129     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
main(String[] args)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 }
135