1 /*
2 * Copyright (c) 2010, 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
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
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, 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(), null);
90 fail();
91 } catch(FileNotFoundException|NullPointerException e) {
92 pass();
93 }
94
95 check(exists, file);
96 }
97
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
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;
125 static void pass() {passed++;}
126 static void fail() {failed++; Thread.dumpStack();}
127 static void fail(String message) {System.out.println(message); fail(); }
128 static void unexpected(Throwable t) {failed++; t.printStackTrace();}
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 }