Flush.java revision 2115:946b30073247 
1/*
2 * Copyright 2010 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
23
24/* @test
25 * @bug 6227608
26 * @summary Test proper handling of flush()
27 * @author Martin Buchholz
28 */
29
30import java.util.*;
31import java.io.*;
32import java.nio.*;
33import java.nio.charset.*;
34
35public class Flush {
36    private static byte[] contents(ByteBuffer bb) {
37        byte[] contents = new byte[bb.position()];
38        ((ByteBuffer)(bb.duplicate().flip())).get(contents);
39        return contents;
40    }
41
42    private static ByteBuffer extend(ByteBuffer bb) {
43        ByteBuffer x = ByteBuffer.allocate(2*bb.capacity()+10);
44        bb.flip();
45        x.put(bb);
46        return x;
47    }
48
49    private static void realMain(String[] args) throws Throwable {
50        // A japanese character should decode as a 3-byte
51        // switch-to-japanese escape sequence, followed by a 2-byte
52        // encoding of the char itself, followed by a 3-byte return to
53        // ASCII escape sequence.
54        char[] jis0208 = {'\u3001'};
55        CharBuffer cb = CharBuffer.wrap(jis0208);
56        ByteBuffer bb = ByteBuffer.allocate(6);
57        CharsetEncoder enc = Charset.forName("ISO-2022-JP").newEncoder();
58
59        check(enc.encode(cb, bb, true).isUnderflow());
60
61        System.out.println(Arrays.toString(contents(bb)));
62        check(! cb.hasRemaining());
63        equal(contents(bb).length, 3 + 2);
64        equal(bb.get(0), (byte)0x1b);
65
66        //----------------------------------------------------------------
67        // We must be able to recover if flush() returns OVERFLOW
68        //----------------------------------------------------------------
69        check(enc.flush(bb).isOverflow());
70        check(enc.flush(bb).isOverflow());
71        equal(contents(bb).length, 3 + 2);
72
73        bb = extend(bb);
74
75        check(enc.flush(bb).isUnderflow());
76        equal(bb.get(3 + 2), (byte)0x1b);
77        System.out.println(Arrays.toString(contents(bb)));
78        equal(contents(bb).length, 3 + 2 + 3);
79
80        //----------------------------------------------------------------
81        // A final redundant flush() is a no-op
82        //----------------------------------------------------------------
83        check(enc.flush(bb).isUnderflow());
84        check(enc.flush(bb).isUnderflow());
85        equal(contents(bb).length, 3 + 2 + 3);
86
87        //----------------------------------------------------------------
88        // CharsetEncoder.encode(ByteBuffer) must call flush(ByteBuffer)
89        //----------------------------------------------------------------
90        bb = enc.encode(CharBuffer.wrap(jis0208));
91        byte[] expected = "\u001b$B!\"\u001b(B".getBytes("ASCII");
92        byte[] contents = new byte[bb.limit()]; bb.get(contents);
93        check(Arrays.equals(contents, expected));
94    }
95
96    //--------------------- Infrastructure ---------------------------
97    static volatile int passed = 0, failed = 0;
98    static void pass() { passed++; }
99    static void fail() { failed++; Thread.dumpStack(); }
100    static void fail(String msg) { System.out.println(msg); fail(); }
101    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
102    static void check(boolean cond) { if (cond) pass(); else fail(); }
103    static void equal(Object x, Object y) {
104        if (x == null ? y == null : x.equals(y)) pass();
105        else {System.out.println(x + " not equal to " + y); fail(); }}
106
107    public static void main(String[] args) throws Throwable {
108        try { realMain(args); } catch (Throwable t) { unexpected(t); }
109
110        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
111        if (failed > 0) throw new Exception("Some tests failed");
112    }
113}
114