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.PrintWriter;
37 import java.io.UnsupportedEncodingException;
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 
realMain(String[] args)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 
test(boolean exists, File file)58     private static void test(boolean exists, File file) throws Throwable {
59         /* PrintWriter(File file, String csn) */
60         try {
61             new PrintWriter(file, UNSUPPORTED_CHARSET);
62             fail();
63         } catch(FileNotFoundException|UnsupportedEncodingException e) {
64             pass();
65         }
66 
67         check(exists, file);
68 
69         try {
70             new PrintWriter(file, (String)null);
71             fail();
72         } catch(FileNotFoundException|NullPointerException e) {
73             pass();
74         }
75 
76         check(exists, file);
77 
78         /* PrintWriter(String fileName, String csn)  */
79         try {
80             new PrintWriter(file.getName(), UNSUPPORTED_CHARSET);
81             fail();
82         } catch(FileNotFoundException|UnsupportedEncodingException e) {
83             pass();
84         }
85 
86         check(exists, file);
87 
88         try {
89             new PrintWriter(file.getName(), (String)null);
90             fail();
91         } catch(FileNotFoundException|NullPointerException e) {
92             pass();
93         }
94 
95         check(exists, file);
96     }
97 
check(boolean exists, File file)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 
verifyContents(File file)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;
pass()125     static void pass() {passed++;}
fail()126     static void fail() {failed++; Thread.dumpStack();}
fail(String message)127     static void fail(String message) {System.out.println(message); fail(); }
unexpected(Throwable t)128     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
main(String[] args)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 }
134