Source Code Cross Referenced for SingleByteCharsetConverter.java in  » Database-JDBC-Connection-Pool » mysql-connector-java-5.1.3 » com » mysql » jdbc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Database JDBC Connection Pool » mysql connector java 5.1.3 » com.mysql.jdbc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         Copyright (C) 2002-2004 MySQL AB
003:
004:         This program is free software; you can redistribute it and/or modify
005:         it under the terms of version 2 of the GNU General Public License as 
006:         published by the Free Software Foundation.
007:
008:         There are special exceptions to the terms and conditions of the GPL 
009:         as it is applied to this software. View the full text of the 
010:         exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
011:         software distribution.
012:
013:         This program is distributed in the hope that it will be useful,
014:         but WITHOUT ANY WARRANTY; without even the implied warranty of
015:         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016:         GNU General Public License for more details.
017:
018:         You should have received a copy of the GNU General Public License
019:         along with this program; if not, write to the Free Software
020:         Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
021:
022:
023:
024:         */
025:        package com.mysql.jdbc;
026:
027:        import java.io.UnsupportedEncodingException;
028:
029:        import java.sql.SQLException;
030:        import java.util.HashMap;
031:        import java.util.Map;
032:
033:        /**
034:         * Converter for char[]->byte[] and byte[]->char[] for single-byte character
035:         * sets.
036:         * 
037:         * Much faster (5-6x) than the built-in solution that ships with the JVM, even
038:         * with JDK-1.4.x and NewIo.
039:         * 
040:         * @author Mark Matthews
041:         */
042:        public class SingleByteCharsetConverter {
043:
044:            private static final int BYTE_RANGE = (1 + Byte.MAX_VALUE)
045:                    - Byte.MIN_VALUE;
046:            private static byte[] allBytes = new byte[BYTE_RANGE];
047:            private static final Map CONVERTER_MAP = new HashMap();
048:
049:            private final static byte[] EMPTY_BYTE_ARRAY = new byte[0];
050:
051:            // The initial charToByteMap, with all char mappings mapped
052:            // to (byte) '?', so that unknown characters are mapped to '?'
053:            // instead of '\0' (which means end-of-string to MySQL).
054:            private static byte[] unknownCharsMap = new byte[65536];
055:
056:            static {
057:                for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; i++) {
058:                    allBytes[i - Byte.MIN_VALUE] = (byte) i;
059:                }
060:
061:                for (int i = 0; i < unknownCharsMap.length; i++) {
062:                    unknownCharsMap[i] = (byte) '?'; // use something 'sane' for
063:                    // unknown chars
064:                }
065:            }
066:
067:            // ~ Instance fields
068:            // --------------------------------------------------------
069:
070:            /**
071:             * Get a converter for the given encoding name
072:             * 
073:             * @param encodingName
074:             *            the Java character encoding name
075:             * 
076:             * @return a converter for the given encoding name
077:             * @throws UnsupportedEncodingException
078:             *             if the character encoding is not supported
079:             */
080:            public static synchronized SingleByteCharsetConverter getInstance(
081:                    String encodingName, Connection conn)
082:                    throws UnsupportedEncodingException, SQLException {
083:                SingleByteCharsetConverter instance = (SingleByteCharsetConverter) CONVERTER_MAP
084:                        .get(encodingName);
085:
086:                if (instance == null) {
087:                    instance = initCharset(encodingName);
088:                }
089:
090:                return instance;
091:            }
092:
093:            /**
094:             * Initialize the shared instance of a converter for the given character
095:             * encoding.
096:             * 
097:             * @param javaEncodingName
098:             *            the Java name for the character set to initialize
099:             * @return a converter for the given character set
100:             * @throws UnsupportedEncodingException
101:             *             if the character encoding is not supported
102:             */
103:            public static SingleByteCharsetConverter initCharset(
104:                    String javaEncodingName)
105:                    throws UnsupportedEncodingException, SQLException {
106:                if (CharsetMapping.isMultibyteCharset(javaEncodingName)) {
107:                    return null;
108:                }
109:
110:                SingleByteCharsetConverter converter = new SingleByteCharsetConverter(
111:                        javaEncodingName);
112:
113:                CONVERTER_MAP.put(javaEncodingName, converter);
114:
115:                return converter;
116:            }
117:
118:            // ~ Constructors
119:            // -----------------------------------------------------------
120:
121:            /**
122:             * Convert the byte buffer from startPos to a length of length to a string
123:             * using the default platform encoding.
124:             * 
125:             * @param buffer
126:             *            the bytes to convert
127:             * @param startPos
128:             *            the index to start at
129:             * @param length
130:             *            the number of bytes to convert
131:             * @return the String representation of the given bytes
132:             */
133:            public static String toStringDefaultEncoding(byte[] buffer,
134:                    int startPos, int length) {
135:                return new String(buffer, startPos, length);
136:            }
137:
138:            // ~ Methods
139:            // ----------------------------------------------------------------
140:
141:            private char[] byteToChars = new char[BYTE_RANGE];
142:
143:            private byte[] charToByteMap = new byte[65536];
144:
145:            /**
146:             * Prevent instantiation, called out of static method initCharset().
147:             * 
148:             * @param encodingName
149:             *            a JVM character encoding
150:             * @throws UnsupportedEncodingException
151:             *             if the JVM does not support the encoding
152:             */
153:            private SingleByteCharsetConverter(String encodingName)
154:                    throws UnsupportedEncodingException {
155:                String allBytesString = new String(allBytes, 0, BYTE_RANGE,
156:                        encodingName);
157:                int allBytesLen = allBytesString.length();
158:
159:                System.arraycopy(unknownCharsMap, 0, this .charToByteMap, 0,
160:                        this .charToByteMap.length);
161:
162:                for (int i = 0; i < BYTE_RANGE && i < allBytesLen; i++) {
163:                    char c = allBytesString.charAt(i);
164:                    this .byteToChars[i] = c;
165:                    this .charToByteMap[c] = allBytes[i];
166:                }
167:            }
168:
169:            public final byte[] toBytes(char[] c) {
170:                if (c == null) {
171:                    return null;
172:                }
173:
174:                int length = c.length;
175:                byte[] bytes = new byte[length];
176:
177:                for (int i = 0; i < length; i++) {
178:                    bytes[i] = this .charToByteMap[c[i]];
179:                }
180:
181:                return bytes;
182:            }
183:
184:            public final byte[] toBytesWrapped(char[] c, char beginWrap,
185:                    char endWrap) {
186:                if (c == null) {
187:                    return null;
188:                }
189:
190:                int length = c.length + 2;
191:                int charLength = c.length;
192:
193:                byte[] bytes = new byte[length];
194:                bytes[0] = this .charToByteMap[beginWrap];
195:
196:                for (int i = 0; i < charLength; i++) {
197:                    bytes[i + 1] = this .charToByteMap[c[i]];
198:                }
199:
200:                bytes[length - 1] = this .charToByteMap[endWrap];
201:
202:                return bytes;
203:            }
204:
205:            public final byte[] toBytes(char[] chars, int offset, int length) {
206:                if (chars == null) {
207:                    return null;
208:                }
209:
210:                if (length == 0) {
211:                    return EMPTY_BYTE_ARRAY;
212:                }
213:
214:                byte[] bytes = new byte[length];
215:
216:                for (int i = 0; (i < length); i++) {
217:                    bytes[i] = this .charToByteMap[chars[i + offset]];
218:                }
219:
220:                return bytes;
221:            }
222:
223:            /**
224:             * Convert the given string to an array of bytes.
225:             * 
226:             * @param s
227:             *            the String to convert
228:             * @return the bytes that make up the String
229:             */
230:            public final byte[] toBytes(String s) {
231:                if (s == null) {
232:                    return null;
233:                }
234:
235:                int length = s.length();
236:                byte[] bytes = new byte[length];
237:
238:                for (int i = 0; i < length; i++) {
239:                    bytes[i] = this .charToByteMap[s.charAt(i)];
240:                }
241:
242:                return bytes;
243:            }
244:
245:            public final byte[] toBytesWrapped(String s, char beginWrap,
246:                    char endWrap) {
247:                if (s == null) {
248:                    return null;
249:                }
250:
251:                int stringLength = s.length();
252:
253:                int length = stringLength + 2;
254:
255:                byte[] bytes = new byte[length];
256:
257:                bytes[0] = this .charToByteMap[beginWrap];
258:
259:                for (int i = 0; i < stringLength; i++) {
260:                    bytes[i + 1] = this .charToByteMap[s.charAt(i)];
261:                }
262:
263:                bytes[length - 1] = this .charToByteMap[endWrap];
264:
265:                return bytes;
266:            }
267:
268:            /**
269:             * Convert the given string to an array of bytes.
270:             * 
271:             * @param s
272:             *            the String to convert
273:             * @param offset
274:             *            the offset to start at
275:             * @param length
276:             *            length (max) to convert
277:             * 
278:             * @return the bytes that make up the String
279:             */
280:            public final byte[] toBytes(String s, int offset, int length) {
281:                if (s == null) {
282:                    return null;
283:                }
284:
285:                if (length == 0) {
286:                    return EMPTY_BYTE_ARRAY;
287:                }
288:
289:                byte[] bytes = new byte[length];
290:
291:                for (int i = 0; (i < length); i++) {
292:                    char c = s.charAt(i + offset);
293:                    bytes[i] = this .charToByteMap[c];
294:                }
295:
296:                return bytes;
297:            }
298:
299:            /**
300:             * Convert the byte buffer to a string using this instance's character
301:             * encoding.
302:             * 
303:             * @param buffer
304:             *            the bytes to convert to a String
305:             * @return the converted String
306:             */
307:            public final String toString(byte[] buffer) {
308:                return toString(buffer, 0, buffer.length);
309:            }
310:
311:            /**
312:             * Convert the byte buffer from startPos to a length of length to a string
313:             * using this instance's character encoding.
314:             * 
315:             * @param buffer
316:             *            the bytes to convert
317:             * @param startPos
318:             *            the index to start at
319:             * @param length
320:             *            the number of bytes to convert
321:             * @return the String representation of the given bytes
322:             */
323:            public final String toString(byte[] buffer, int startPos, int length) {
324:                char[] charArray = new char[length];
325:                int readpoint = startPos;
326:
327:                for (int i = 0; i < length; i++) {
328:                    charArray[i] = this .byteToChars[buffer[readpoint]
329:                            - Byte.MIN_VALUE];
330:                    readpoint++;
331:                }
332:
333:                return new String(charArray);
334:            }
335:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.