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.PrintWriter;
37import java.io.UnsupportedEncodingException;
38
39public 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}
134