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.nio.file.Files;
38 import java.util.Formatter;
39 
40 public class FailingConstructors {
41     static final String fileName = "FailingConstructorsTest";
42     static final String UNSUPPORTED_CHARSET = "unknownCharset";
43     static final String FILE_CONTENTS = "This is a small file!";
44 
realMain(String[] args)45     private static void realMain(String[] args) throws Throwable {
46         test(false, new File(fileName));
47 
48         /* create the file and write its contents */
49         File file = File.createTempFile(fileName, null);
50         file.deleteOnExit();
51         Files.write(file.toPath(), FILE_CONTENTS.getBytes());
52 
53         test(true, file);
54         file.delete();
55     }
56 
test(boolean exists, File file)57     private static void test(boolean exists, File file) throws Throwable {
58         /* Formatter(File file, String csn) */
59         try {
60             new Formatter(file, UNSUPPORTED_CHARSET);
61             fail();
62         } catch(FileNotFoundException|UnsupportedEncodingException e) {
63             pass();
64         }
65 
66         check(exists, file);
67 
68         try {
69             new Formatter(file, null);
70             fail();
71         } catch(FileNotFoundException|NullPointerException e) {
72             pass();
73         }
74 
75         check(exists, file);
76 
77         /* Formatter(String fileName, String csn)  */
78         try {
79             new Formatter(file.getName(), UNSUPPORTED_CHARSET);
80             fail();
81         } catch(FileNotFoundException|UnsupportedEncodingException e) {
82             pass();
83         }
84 
85         check(exists, file);
86 
87         try {
88             new Formatter(file.getName(), null);
89             fail();
90         } catch(FileNotFoundException|NullPointerException e) {
91             pass();
92         }
93 
94         check(exists, file);
95     }
96 
check(boolean exists, File file)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 
verifyContents(File file)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;
pass()124     static void pass() {passed++;}
fail()125     static void fail() {failed++; Thread.dumpStack();}
fail(String message)126     static void fail(String message) {System.out.println(message); fail(); }
unexpected(Throwable t)127     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
main(String[] args)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 }
133