1/*
2 * Copyright (c) 2004, 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 5030063
27 * @summary Basic tests for flush().
28 */
29
30import java.io.Closeable;
31import java.io.Flushable;
32import java.util.Formatter;
33import java.util.FormatterClosedException;
34
35public class Flush {
36
37    private static class ExpectedException extends RuntimeException {}
38
39    private static class F implements Appendable, Closeable, Flushable {
40        public Appendable append(CharSequence csq) { return null; }
41        public Appendable append(char c) { return null; }
42        public Appendable append(CharSequence csq, int s, int e) {
43            return null;
44        }
45        public void close() {}
46
47        public void flush() {
48            throw new ExpectedException();
49        }
50    }
51
52    private static class NF implements Appendable, Closeable {
53        public Appendable append(CharSequence csq) { return null; }
54        public Appendable append(char c) { return null; }
55        public Appendable append(CharSequence csq, int s, int e) {
56            return null;
57        }
58        public void close() {}
59
60        // method coincidentally called flush()
61        public void flush() {
62            throw new RuntimeException("NF.flush should not be called");
63        }
64    }
65
66    private static void test(Formatter f) {
67        if (f.out() instanceof F) {
68            // F.flush() called since F implements Flushable
69            try {
70                f.flush();
71                throw new RuntimeException("F.flush not called");
72            } catch (ExpectedException x) {
73                System.out.println("  F.flush called");
74            }
75        } else {
76            // NF.flush() not called since NF does not implement Flushable
77            f.flush();
78        }
79
80        // Formatter is a Flushable
81        if (!(f instanceof Flushable))
82            throw new RuntimeException("Formatter is not a Flushable");
83
84        // flush() after close() throws a FormatterClosedException
85        f.close();
86        try {
87            f.flush();
88            throw new RuntimeException("FormatterClosedException not thrown");
89        } catch (FormatterClosedException x) {
90            System.out.println("  FormatterClosedException thrown");
91        }
92    }
93
94    public static void main(String [] args) {
95        System.out.println("testing Flushable");
96        test(new Formatter(new F()));
97        System.out.println("testing non-Flushable");
98        test(new Formatter(new NF()));
99    }
100}
101