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comparison src/org/tn5250j/encoding/builtin/CodepageConverterAdapter.java @ 5:cbdff98c45ea tn5250

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adding tn5250 files
author Carl Byington <carl@five-ten-sg.com>
date Thu, 22 May 2014 12:38:09 -0700
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children b29b39f386a4
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4:1f5d9b76a183 5:cbdff98c45ea
1 /**
2 * $Id$
3 *
4 * Title: tn5250J
5 * Copyright: Copyright (c) 2001,2009
6 * Company:
7 * @author: master_jaf
8 *
9 * Description:
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this software; see the file COPYING. If not, write to
23 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
24 * Boston, MA 02111-1307 USA
25 *
26 */
27 package org.tn5250j.encoding.builtin;
28
29 import java.util.Arrays;
30
31 /**
32 * Adapter class for converters using 8bit codepages.
33 *
34 * @author master_jaf
35 */
36 public abstract class CodepageConverterAdapter implements ICodepageConverter {
37
38 private char[] codepage = null;
39 private int[] reverse_codepage = null;
40
41 /* (non-Javadoc)
42 * @see org.tn5250j.cp.ICodepageConverter#init()
43 */
44 public ICodepageConverter init() {
45 codepage = getCodePage();
46
47 int size = 0;
48 for (int i=0; i<codepage.length; i++) {
49 size = Math.max(size, codepage[i]);
50 }
51 assert (size + 1) < 1024*1024; // some kind of maximum size limiter.
52 reverse_codepage = new int[size+1];
53 Arrays.fill(reverse_codepage, '?');
54 for (int i=0; i<codepage.length; i++) {
55 reverse_codepage[codepage[i]] = i;
56 }
57 return this;
58 }
59
60 /* (non-Javadoc)
61 * @see org.tn5250j.cp.ICodepageConverter#uni2ebcdic(char)
62 */
63 public byte uni2ebcdic(char index) {
64 assert index < reverse_codepage.length;
65 return (byte)reverse_codepage[index];
66 }
67
68 /* (non-Javadoc)
69 * @see org.tn5250j.cp.ICodepageConverter#ebcdic2uni(int)
70 */
71 public char ebcdic2uni(int index) {
72 index = index & 0xFF;
73 assert index < 256;
74 return codepage[index];
75 }
76
77 /**
78 * @return The oringal 8bit codepage.
79 */
80 protected abstract char[] getCodePage();
81
82 }