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
31import java.io.File;
32import java.io.FileInputStream;
33import java.io.FileOutputStream;
34import java.io.FileNotFoundException;
35import java.io.IOException;
36import java.io.UnsupportedEncodingException;
37import java.nio.file.Files;
38import java.util.Formatter;
39
40public 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
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
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
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
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;
124    static void pass() {passed++;}
125    static void fail() {failed++; Thread.dumpStack();}
126    static void fail(String message) {System.out.println(message); fail(); }
127    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
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