1 /*
2  * Copyright (c) 2010, 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 /* @test
25  * @bug 4821213
26  * @summary Unit test for CharsetEncoder.canEncode methods
27  */
28 
29 import java.io.*;
30 import java.nio.*;
31 import java.nio.charset.*;
32 
33 
34 public class CanEncode {
35 
36     private static int errors = 0;
37     private static PrintStream out = System.err;
38 
wrong(CharsetEncoder ce, boolean can, String what)39     private static void wrong(CharsetEncoder ce, boolean can, String what) {
40         out.println(ce.charset().name()
41                     + ": Wrong answer for " + what
42                     + ": " + !can);
43         errors++;
44     }
45 
ck(CharsetEncoder ce, char c, boolean can)46     private static void ck(CharsetEncoder ce, char c, boolean can)
47         throws Exception
48     {
49         if (ce.canEncode(c) != can)
50             wrong(ce, can,
51                   ("'" + c + "' (0x"
52                    + Integer.toHexString(c & 0xffff) + ")"));
53     }
54 
ck(CharsetEncoder ce, String s, boolean can)55     private static void ck(CharsetEncoder ce, String s, boolean can)
56         throws Exception
57     {
58         if (ce.canEncode(CharBuffer.wrap(s.toCharArray())) != can)
59             wrong(ce, can, "array \"" + s + "\"");
60         if (ce.canEncode(CharBuffer.wrap(s)) != can)
61             wrong(ce, can, "buffer  \"" + s + "\"");
62     }
63 
test(String csn)64     private static void test(String csn) throws Exception {
65 
66         Charset cs = Charset.forName(csn);
67         CharsetEncoder ce = cs.newEncoder();
68 
69         if (cs.name().equals("US-ASCII")) {
70             ck(ce, 'x', true);
71             ck(ce, '\u00B6', false);
72             ck(ce, "x", true);
73             ck(ce, "\u00B6", false);
74             ck(ce, "xyzzy", true);
75             ck(ce, "xy\u00B6", false);
76         }
77 
78         // Unpaired surrogates should never be encodable
79         ck(ce, '\ud800', false);
80         ck(ce, '\ud801', false);
81         ck(ce, '\udffe', false);
82         ck(ce, '\udfff', false);
83         ck(ce, "\ud800", false);
84         ck(ce, "\ud801", false);
85         ck(ce, "\udffe", false);
86         ck(ce, "\udfff", false);
87 
88     }
89 
main(String[] args)90     public static void main(String[] args) throws Exception {
91         test("US-ASCII");
92         test("UTF-8");
93     }
94 
95 }
96