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.nio.file.Files;
37 import java.util.Scanner;
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         Files.write(file.toPath(), FILE_CONTENTS.getBytes());
51 
52         test(true, file);
53         file.delete();
54     }
55 
test(boolean exists, File file)56     private static void test(boolean exists, File file) throws Throwable {
57         /* Scanner(File source, String charsetName) */
58         try {
59             new Scanner(file, UNSUPPORTED_CHARSET);
60             fail();
61         } catch(FileNotFoundException|IllegalArgumentException e) {
62             pass();
63         }
64 
65         check(exists, file);
66 
67         try {
68             new Scanner(file, null);
69             fail();
70         } catch(FileNotFoundException|NullPointerException e) {
71             pass();
72         }
73 
74         check(exists, file);
75 
76         /* Scanner(FileRef source, String charsetName) */
77         try {
78             new Scanner(file.toPath(), UNSUPPORTED_CHARSET);
79             fail();
80         } catch(FileNotFoundException|IllegalArgumentException  e) {
81             pass();
82         }
83 
84         check(exists, file);
85 
86         try {
87             new Scanner(file.toPath(), null);
88             fail();
89         } catch(FileNotFoundException|NullPointerException e) {
90             pass();
91         }
92 
93         check(exists, file);
94     }
95 
check(boolean exists, File file)96     private static void check(boolean exists, File file) {
97         if (exists) {
98             /* the file should be unchanged */
99             verifyContents(file);
100         } else {
101             /* the file should not have been created */
102             if (file.exists()) { fail(file + " should not have been created"); }
103         }
104     }
105 
verifyContents(File file)106     private static void verifyContents(File file) {
107         try (FileInputStream fis = new FileInputStream(file)) {
108             byte[] contents = FILE_CONTENTS.getBytes();
109             int read, count = 0;
110             while ((read = fis.read()) != -1) {
111                 if (read != contents[count++])  {
112                     fail("file contents have been altered");
113                     return;
114                 }
115             }
116         } catch (IOException ioe) {
117             unexpected(ioe);
118         }
119     }
120 
121     //--------------------- Infrastructure ---------------------------
122     static volatile int passed = 0, failed = 0;
pass()123     static void pass() {passed++;}
fail()124     static void fail() {failed++; Thread.dumpStack();}
fail(String message)125     static void fail(String message) {System.out.println(message); fail(); }
unexpected(Throwable t)126     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
main(String[] args)127     public static void main(String[] args) throws Throwable {
128         try {realMain(args);} catch (Throwable t) {unexpected(t);}
129         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
130         if (failed > 0) throw new AssertionError("Some tests failed");}
131 }
132