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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) 2001,2012
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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;
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28
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29 import java.lang.reflect.Constructor;
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30 import java.util.ArrayList;
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31 import java.util.HashSet;
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32 import java.util.List;
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33
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34 import org.tn5250j.encoding.builtin.CCSID1025;
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35 import org.tn5250j.encoding.builtin.CCSID1026;
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36 import org.tn5250j.encoding.builtin.CCSID1112;
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37 import org.tn5250j.encoding.builtin.CCSID1140;
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38 import org.tn5250j.encoding.builtin.CCSID1141;
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39 import org.tn5250j.encoding.builtin.CCSID1147;
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40 import org.tn5250j.encoding.builtin.CCSID1148;
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41 import org.tn5250j.encoding.builtin.CCSID273;
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42 import org.tn5250j.encoding.builtin.CCSID277;
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43 import org.tn5250j.encoding.builtin.CCSID278;
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44 import org.tn5250j.encoding.builtin.CCSID280;
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45 import org.tn5250j.encoding.builtin.CCSID284;
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46 import org.tn5250j.encoding.builtin.CCSID285;
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47 import org.tn5250j.encoding.builtin.CCSID297;
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48 import org.tn5250j.encoding.builtin.CCSID37;
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49 import org.tn5250j.encoding.builtin.CCSID424;
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50 import org.tn5250j.encoding.builtin.CCSID500;
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51 import org.tn5250j.encoding.builtin.CCSID870;
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52 import org.tn5250j.encoding.builtin.CCSID871;
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53 import org.tn5250j.encoding.builtin.CCSID875;
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54 import org.tn5250j.encoding.builtin.ICodepageConverter;
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55 import org.tn5250j.tools.logging.TN5250jLogFactory;
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56 import org.tn5250j.tools.logging.TN5250jLogger;
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57
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58 /**
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59 * Methods for built-in code page support.
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60 */
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61 /* package */ class BuiltInCodePageFactory {
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62
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63 private static BuiltInCodePageFactory singleton;
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64
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65 private final List<Class<?>> clazzes = new ArrayList<Class<?>>();
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66 private final TN5250jLogger log = TN5250jLogFactory.getLogger(this.getClass());
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67
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68 private BuiltInCodePageFactory() {
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69 register();
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70 }
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71
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72 public static synchronized final BuiltInCodePageFactory getInstance() {
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73 if (singleton == null) {
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74 singleton = new BuiltInCodePageFactory();
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75 }
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76 return singleton;
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77 }
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78
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79 private void register() {
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80 clazzes.add(CCSID37.class);
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81 clazzes.add(CCSID273.class);
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82 clazzes.add(CCSID277.class);
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83 clazzes.add(CCSID278.class);
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84 clazzes.add(CCSID280.class);
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85 clazzes.add(CCSID284.class);
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86 clazzes.add(CCSID285.class);
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87 clazzes.add(CCSID297.class);
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88 clazzes.add(CCSID424.class);
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89 clazzes.add(CCSID500.class);
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90 clazzes.add(CCSID870.class);
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91 clazzes.add(CCSID871.class);
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92 clazzes.add(CCSID875.class);
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93 clazzes.add(CCSID1025.class);
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94 clazzes.add(CCSID1026.class);
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95 clazzes.add(CCSID1112.class);
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96 clazzes.add(CCSID1140.class);
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97 clazzes.add(CCSID1141.class);
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98 clazzes.add(CCSID1147.class);
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99 clazzes.add(CCSID1148.class);
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100 }
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101
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102 /**
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103 * @return unsorted list of available code pages
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104 */
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105 public String[] getAvailableCodePages() {
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106 HashSet<String> cpset = new HashSet<String>();
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107 for (Class<?> clazz : clazzes) {
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108 final ICodepageConverter converter = getConverterFromClassName(clazz);
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109 if (converter != null) {
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110 cpset.add(converter.getName());
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111 }
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112 }
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113 return cpset.toArray(new String[cpset.size()]);
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114 }
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115
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116 /**
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117 * @param encoding
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118 * @return an {@link ICodePage} object OR null, of not found
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119 */
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120 public ICodePage getCodePage(String encoding) {
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121 for (Class<?> clazz : clazzes) {
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122 final ICodepageConverter converter = getConverterFromClassName(clazz);
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123 if (converter != null && converter.getName().equals(encoding)) {
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124 return converter;
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125 }
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126 }
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127 return null;
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128 }
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129
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130 /**
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131 * Lazy loading converters takes time,
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132 * but doesn't happen so often and saves memory.
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133 *
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134 * @param clazz {@link ICodepageConverter}
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135 * @return
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136 */
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137 private ICodepageConverter getConverterFromClassName(Class<?> clazz) {
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138 try {
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139 final Constructor<?> constructor = clazz.getConstructor(new Class[0]);
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140 final ICodepageConverter converter = (ICodepageConverter) constructor.newInstance();
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141 converter.init();
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142 return converter;
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143 } catch (Exception e) {
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144 log.error("Couldn't load code page converter class:" + clazz.getCanonicalName(), e);
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145 return null;
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146 }
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147 }
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148
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149 }
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