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comparison src/org/tn5250j/encoding/ToolboxCodePageFactory.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 5949eb469a79
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4:1f5d9b76a183 5:cbdff98c45ea
1 /**
2 * Title: ToolboxCodePage
3 * Copyright: Copyright (c) 2001, 2002, 2003
4 * Company:
5 * @author Kenneth J. Pouncey
6 * rewritten by LDC, WVL, Luc
7 * @version 0.4
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;
28
29 import java.lang.reflect.Constructor;
30 import java.lang.reflect.Method;
31
32 import org.tn5250j.tools.logging.TN5250jLogFactory;
33 import org.tn5250j.tools.logging.TN5250jLogger;
34
35 /* package */ class ToolboxCodePageFactory {
36
37 private final static String[] CODEPAGES = { "Big5", "Cp037", "Cp273", "Cp277", "Cp278",
38 "Cp280", "Cp284", "Cp285", "Cp297", "Cp420", "Cp424", "Cp437",
39 "Cp500", "Cp737", "Cp775", "Cp838", "Cp850", "Cp852", "Cp855",
40 "Cp856", "Cp857", "Cp858", "Cp860", "Cp861", "Cp862", "Cp863",
41 "Cp864", "Cp865", "Cp866", "Cp868", "Cp869", "Cp870",
42 "Cp871", "Cp874", "Cp875", "Cp918", "Cp921", "Cp922",
43 "Cp923", // IBM Latin-9.
44 "Cp930", "Cp933", "Cp935", "Cp937", "Cp939", "Cp942", "Cp943",
45 "Cp948", "Cp949", "Cp950", "Cp964", "Cp970", "Cp1006", "Cp1025",
46 "Cp1026", "Cp1046", "Cp1097", "Cp1098", "Cp1112", "Cp1122",
47 "Cp1123", "Cp1124", "Cp1140", "Cp1141", "Cp1142", "Cp1143",
48 "Cp1144", "Cp1145", "Cp1146", "Cp1147", "Cp1148", "Cp1149",
49 "Cp1252", "Cp1250", "Cp1251", "Cp1253", "Cp1254", "Cp1255",
50 "Cp1256", "Cp1257", "Cp1258", "Cp1381", "Cp1383", "Cp33722" };
51
52 private static final String CONVERTER_NAME = "com.ibm.as400.access.CharConverter";
53 private static final String TOBYTES_NAME = "stringToByteArray";
54 private static final String TOSTRING_NAME = "byteArrayToString";
55
56 private static ToolboxCodePageFactory singleton;
57
58 private final TN5250jLogger log = TN5250jLogFactory.getLogger(this.getClass());
59
60 private ToolboxCodePageFactory() {
61 /* private for singleton */
62 }
63
64 public static synchronized ToolboxCodePageFactory getInstance() {
65 if (singleton == null) {
66 singleton = new ToolboxCodePageFactory();
67 }
68 return singleton;
69 }
70
71 /**
72 * @return
73 */
74 public String[] getAvailableCodePages() {
75 try {
76 final ClassLoader loader = getClassLoader();
77 Class.forName(CONVERTER_NAME, false, loader);
78 return CODEPAGES;
79 } catch (Exception e) {
80 log.info("Couldn't locate JT400 Toolbox in classpath. Charset converters can't be used.");
81 return new String[0];
82 }
83 }
84
85 /**
86 * @param encoding
87 * @return
88 */
89 public ICodePage getCodePage(String encoding) {
90 try {
91 ClassLoader loader = getClassLoader();
92 Class<?> conv_class = Class.forName(CONVERTER_NAME, true, loader);
93 Constructor<?> conv_constructor = conv_class.getConstructor(new Class[] { String.class });
94 Method toBytes_method = conv_class.getMethod(TOBYTES_NAME, new Class[] { String.class });
95 Method toString_method = conv_class.getMethod(TOSTRING_NAME, new Class[] { byte[].class });
96 Object convobj = conv_constructor.newInstance(new Object[] { encoding });
97 return new ToolboxConverterProxy(convobj, toBytes_method, toString_method);
98 } catch (Exception e) {
99 log.warn("Can't load charset converter from JT400 Toolbox for code page " + encoding, e);
100 return null;
101 }
102 }
103
104 private static final ClassLoader getClassLoader() {
105 ClassLoader loader = ToolboxCodePageFactory.class.getClassLoader();
106 if (loader == null) {
107 loader = ClassLoader.getSystemClassLoader();
108 }
109 return loader;
110 }
111
112 private static class ToolboxConverterProxy implements ICodePage {
113
114 private final Object converter;
115 private final Method tobytesMethod;
116 private final Method tostringMethod;
117
118 private ToolboxConverterProxy(Object converterObject, Method tobytesMethod, Method tostringMethod) {
119 super();
120 this.converter = converterObject;
121 this.tobytesMethod = tobytesMethod;
122 this.tostringMethod = tostringMethod;
123 }
124
125 @Override
126 public char ebcdic2uni(int index) {
127 Object result;
128 try {
129 result = tostringMethod.invoke(converter, new Object[] { new byte[] { (byte) (index & 0xFF) } });
130 } catch (Throwable t) {
131 result = null;
132 }
133
134 if (result == null)
135 return 0x00;
136
137 return ((String) result).charAt(0);
138 }
139
140 @Override
141 public byte uni2ebcdic(char index) {
142 Object result;
143 try {
144 result = tobytesMethod.invoke(converter, new Object[] { new String(new char[] { index }) });
145 } catch (Throwable t) {
146 result = null;
147 }
148
149 if (result == null)
150 return 0x00;
151
152 return ((byte[]) result)[0];
153 }
154 }
155
156 }