1 /*
2  * Copyright (c) 2011, 2017, 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 8190577
27  * @summary PrintStream, PrintWriter, Formatter, Scanner leave files open when
28  *          exception thrown
29  */
30 
31 package test.java.util.Scanner;
32 
33 import java.io.File;
34 import java.io.FileInputStream;
35 import java.io.FileOutputStream;
36 import java.io.FileNotFoundException;
37 import java.io.IOException;
38 import java.nio.charset.Charset;
39 import java.nio.file.Files;
40 import java.util.Scanner;
41 
42 public class FailingConstructors {
43     static final String fileName = "FailingConstructorsTest";
44     static final String UNSUPPORTED_CHARSET = "unknownCharset";
45     static final String FILE_CONTENTS = "This is a small file!";
46 
realMain(String[] args)47     private static void realMain(String[] args) throws Throwable {
48         test(false, new File(fileName));
49 
50         /* create the file and write its contents */
51         File file = File.createTempFile(fileName, null);
52         file.deleteOnExit();
53         Files.write(file.toPath(), FILE_CONTENTS.getBytes());
54 
55         test(true, file);
56         file.delete();
57     }
58 
test(boolean exists, File file)59     private static void test(boolean exists, File file) throws Throwable {
60         /* Scanner(File source, String charsetName) */
61         try {
62             new Scanner(file, UNSUPPORTED_CHARSET);
63             fail();
64         } catch(FileNotFoundException|IllegalArgumentException e) {
65             pass();
66         }
67 
68         check(exists, file);
69 
70         try {
71             new Scanner(file, (String)null);
72             fail();
73         // Android-changed: on Android this constructor throws IAE, not NPE.
74         } catch(FileNotFoundException|IllegalArgumentException e) {
75             pass();
76         }
77 
78         try {
79             new Scanner(file, (Charset)null);
80             fail();
81         } catch(FileNotFoundException|NullPointerException e) {
82             pass();
83         }
84 
85         check(exists, file);
86 
87         /* Scanner(FileRef source, String charsetName) */
88         try {
89             new Scanner(file.toPath(), UNSUPPORTED_CHARSET);
90             fail();
91         } catch(FileNotFoundException|IllegalArgumentException  e) {
92             pass();
93         }
94 
95         check(exists, file);
96 
97         try {
98             new Scanner(file.toPath(), (String)null);
99             fail();
100         } catch(FileNotFoundException|NullPointerException e) {
101             pass();
102         }
103 
104         try {
105             new Scanner(file.toPath(), (Charset)null);
106             fail();
107         } catch(FileNotFoundException|NullPointerException e) {
108             pass();
109         }
110 
111         check(exists, file);
112     }
113 
check(boolean exists, File file)114     private static void check(boolean exists, File file) {
115         if (exists) {
116             /* the file should be unchanged */
117             verifyContents(file);
118         } else {
119             /* the file should not have been created */
120             if (file.exists()) { fail(file + " should not have been created"); }
121         }
122     }
123 
verifyContents(File file)124     private static void verifyContents(File file) {
125         try (FileInputStream fis = new FileInputStream(file)) {
126             byte[] contents = FILE_CONTENTS.getBytes();
127             int read, count = 0;
128             while ((read = fis.read()) != -1) {
129                 if (read != contents[count++])  {
130                     fail("file contents have been altered");
131                     return;
132                 }
133             }
134         } catch (IOException ioe) {
135             unexpected(ioe);
136         }
137     }
138 
139     //--------------------- Infrastructure ---------------------------
140     static volatile int passed = 0, failed = 0;
pass()141     static void pass() {passed++;}
fail()142     static void fail() {failed++; Thread.dumpStack();}
fail(String message)143     static void fail(String message) {System.out.println(message); fail(); }
unexpected(Throwable t)144     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
main(String[] args)145     public static void main(String[] args) throws Throwable {
146         try {realMain(args);} catch (Throwable t) {unexpected(t);}
147         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
148         if (failed > 0) throw new AssertionError("Some tests failed");}
149 }
150