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