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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source J2ee connector - jdbc driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a CVS history command.
*
* All rights reserved.
*/
package org.firebirdsql.encodings;
import java.io.*;
import java.nio.charset.Charset;
import java.sql.SQLException;
import java.util.*;
import java.util.Map.Entry;
public class EncodingFactory {
private static final int[][] CHARSET_MAXIMUM_SIZE = new int[][] {
{ 0, 1} // NONE
, { 1, 1} // OCTETS
, { 2, 1} // ASCII
, { 3, 3} // UNICODE_FSS
, { 4, 4} // UTF8
, { 5, 2} // SJIS_0208
, { 6, 2} // EUJC_0208
, { 9, 1} // DOS737
, {10, 1} // DOS437
, {11, 1} // DOS850
, {12, 1} // DOS865
, {13, 1} // DOS775
, {14, 1} // DOS863
, {15, 1} // DOS775
, {16, 1} // DOS858
, {17, 1} // DOS862
, {18, 1} // DOS864
, {19, 1} // NEXT
, {21, 1} // ISO8859_1
, {22, 1} // ISO8859_2
, {23, 1} // ISO8859_3
, {34, 1} // ISO8859_4
, {35, 1} // ISO8859_5
, {36, 1} // ISO8859_6
, {37, 1} // ISO8859_7
, {38, 1} // ISO8859_8
, {39, 1} // ISO8859_9
, {40, 1} // ISO8859_13
, {44, 2} // KSC_5601
, {45, 1} // DOS852
, {46, 1} // DOS857
, {47, 1} // DOS861
, {48, 1} // DOS866
, {49, 1} // DOS869
, {50, 1} // CYRL
, {51, 1} // WIN1250
, {52, 1} // WIN1251
, {53, 1} // WIN1252
, {54, 1} // WIN1253
, {55, 1} // WIN1254
, {56, 2} // BIG_5
, {57, 2} // GB2312
, {58, 1} // WIN1255
, {59, 1} // WIN1256
, {60, 1} // WIN1257
, {63, 1} // KOI8R
, {64, 1} // KOI8U
, {65, 1} // WIN1258
};
/**
* Default mapping table, provides an "identity" mapping.
*/
public static final char[] DEFAULT_MAPPING = new char[256 * 256];
static final String defaultEncoding;
private static volatile boolean encodingSizesLoaded = false;
private static volatile boolean encodingsLoaded = false;
public static final String ISC_ENCODING_SIZE_RESOURCE =
"isc_encoding_size.properties";
public static final String ISC_ENCODINGS_RESOURCE =
"isc_encodings.properties";
private static final Map iscEncodings = new HashMap();
private static final Map iscEncodingSizes = new HashMap();
private static final Map javaEncodings = new HashMap();
private static final Map javaAliases = new HashMap();
private static final Map translations = Collections.synchronizedMap(new HashMap());
static {
for (int i = 0; i < DEFAULT_MAPPING.length; i++) {
DEFAULT_MAPPING[i] = (char)i;
}
}
static {
InputStreamReader reader = new InputStreamReader(new ByteArrayInputStream(new byte[2]));
defaultEncoding = reader.getEncoding();
try {
reader.close();
}
catch (IOException ioe){
}
}
public static Encoding createEncoding(String encoding) {
if (encoding.equals("NONE")) {
encoding = defaultEncoding;
} else {
String tempEncoding = javaAliases.get(encoding);
if (tempEncoding != null) {
encoding = tempEncoding;
}
}
if (encoding.equals("Cp1250"))
return new Encoding_Cp1250();
else if (encoding.equals("Cp1251"))
return new Encoding_Cp1251();
else if (encoding.equals("Cp1252"))
return new Encoding_Cp1252();
else if (encoding.equals("Cp1253"))
return new Encoding_Cp1253();
else if (encoding.equals("Cp1254"))
return new Encoding_Cp1254();
else if (encoding.equals("Cp1255"))
return new Encoding_Cp1255();
else if (encoding.equals("Cp1256"))
return new Encoding_Cp1256();
else if (encoding.equals("Cp1257"))
return new Encoding_Cp1257();
else if (encoding.equals("Cp437"))
return new Encoding_Cp437();
else if (encoding.equals("Cp737"))
return new Encoding_Cp737();
else if (encoding.equals("Cp775"))
return new Encoding_Cp775();
else if (encoding.equals("Cp850"))
return new Encoding_Cp850();
else if (encoding.equals("Cp852"))
return new Encoding_Cp852();
else if (encoding.equals("Cp857"))
return new Encoding_Cp857();
else if (encoding.equals("Cp858"))
return new Encoding_Cp858();
else if (encoding.equals("Cp860"))
return new Encoding_Cp860();
else if (encoding.equals("Cp861"))
return new Encoding_Cp861();
else if (encoding.equals("Cp862"))
return new Encoding_Cp862();
else if (encoding.equals("Cp863"))
return new Encoding_Cp863();
else if (encoding.equals("Cp864"))
return new Encoding_Cp864();
else if (encoding.equals("Cp865"))
return new Encoding_Cp865();
else if (encoding.equals("Cp866"))
return new Encoding_Cp866();
else if (encoding.equals("Cp869"))
return new Encoding_Cp869();
else if (encoding.equals("ISO8859_1"))
return new Encoding_ISO8859_1();
else if (encoding.equals("ISO8859_2"))
return new Encoding_ISO8859_2();
else if (encoding.equals("ISO8859_3"))
return new Encoding_ISO8859_3();
else if (encoding.equals("ISO8859_4"))
return new Encoding_ISO8859_4();
else if (encoding.equals("ISO8859_5"))
return new Encoding_ISO8859_5();
else if (encoding.equals("ISO8859_6"))
return new Encoding_ISO8859_6();
else if (encoding.equals("ISO8859_7"))
return new Encoding_ISO8859_7();
else if (encoding.equals("ISO8859_8"))
return new Encoding_ISO8859_8();
else if (encoding.equals("ISO8859_9"))
return new Encoding_ISO8859_9();
else if (encoding.equals("ISO8859_13"))
return new Encoding_ISO8859_13();
else
return new Encoding_NotOneByte(encoding);
}
/**
* Get size of a character for the specified character set.
*
* @param characterSetId of the character set.
* @return maximum size of the character in bytes or 1 if charset was
* not found.
*/
public static int getCharacterSetSize(int characterSetId) {
for (int i = 0; i < CHARSET_MAXIMUM_SIZE.length; i++) {
if (CHARSET_MAXIMUM_SIZE[i][0] == characterSetId)
return CHARSET_MAXIMUM_SIZE[i][1];
}
// let's assume that default length is 1
return 1;
}
public static Encoding getEncoding(String encoding){
if (encoding == null)
encoding = defaultEncoding;
return createEncoding(encoding);
}
public static Encoding getEncoding(String encoding, char[] charMapping){
if (encoding == null || encoding.equals("NONE")) {
encoding = defaultEncoding;
} else {
String tempEncoding = javaAliases.get(encoding);
if (tempEncoding != null) {
encoding = tempEncoding;
}
}
if (encoding.equals("Cp1250"))
return new Encoding_Cp1250(charMapping);
else if (encoding.equals("Cp1251"))
return new Encoding_Cp1251(charMapping);
else if (encoding.equals("Cp1252"))
return new Encoding_Cp1252(charMapping);
else if (encoding.equals("Cp1253"))
return new Encoding_Cp1253(charMapping);
else if (encoding.equals("Cp1254"))
return new Encoding_Cp1254(charMapping);
else if (encoding.equals("Cp1255"))
return new Encoding_Cp1255(charMapping);
else if (encoding.equals("Cp1256"))
return new Encoding_Cp1256(charMapping);
else if (encoding.equals("Cp1257"))
return new Encoding_Cp1257(charMapping);
else if (encoding.equals("Cp437"))
return new Encoding_Cp437(charMapping);
else if (encoding.equals("Cp737"))
return new Encoding_Cp737(charMapping);
else if (encoding.equals("Cp775"))
return new Encoding_Cp775(charMapping);
else if (encoding.equals("Cp850"))
return new Encoding_Cp850(charMapping);
else if (encoding.equals("Cp852"))
return new Encoding_Cp852(charMapping);
else if (encoding.equals("Cp857"))
return new Encoding_Cp857(charMapping);
else if (encoding.equals("Cp858"))
return new Encoding_Cp858(charMapping);
else if (encoding.equals("Cp860"))
return new Encoding_Cp860(charMapping);
else if (encoding.equals("Cp861"))
return new Encoding_Cp861(charMapping);
else if (encoding.equals("Cp862"))
return new Encoding_Cp862(charMapping);
else if (encoding.equals("Cp863"))
return new Encoding_Cp863(charMapping);
else if (encoding.equals("Cp864"))
return new Encoding_Cp864(charMapping);
else if (encoding.equals("Cp865"))
return new Encoding_Cp865(charMapping);
else if (encoding.equals("Cp866"))
return new Encoding_Cp866(charMapping);
else if (encoding.equals("Cp869"))
return new Encoding_Cp869(charMapping);
else if (encoding.equals("ISO8859_1"))
return new Encoding_ISO8859_1(charMapping);
else if (encoding.equals("ISO8859_2"))
return new Encoding_ISO8859_2(charMapping);
else if (encoding.equals("ISO8859_3"))
return new Encoding_ISO8859_3(charMapping);
else if (encoding.equals("ISO8859_4"))
return new Encoding_ISO8859_4(charMapping);
else if (encoding.equals("ISO8859_5"))
return new Encoding_ISO8859_5(charMapping);
else if (encoding.equals("ISO8859_6"))
return new Encoding_ISO8859_6(charMapping);
else if (encoding.equals("ISO8859_7"))
return new Encoding_ISO8859_7(charMapping);
else if (encoding.equals("ISO8859_8"))
return new Encoding_ISO8859_8(charMapping);
else if (encoding.equals("ISO8859_9"))
return new Encoding_ISO8859_9(charMapping);
else if (encoding.equals("ISO8859_13"))
return new Encoding_ISO8859_13(charMapping);
else
return new Encoding_NotOneByte(encoding, charMapping);
}
public static Encoding getEncoding(String encoding, String mappingPath) throws SQLException {
if (mappingPath == null)
return getEncoding(encoding);
CharacterTranslator translator = getTranslator(mappingPath);
return getEncoding(encoding, translator.getMapping());
}
/**
* Get InterBase encoding for given Java language encoding.
*
* @param javaEncoding Java language encoding.
* @return corresponding InterBase encoding or null if none
* found.
*/
public static String getIscEncoding(String javaEncoding) {
if (javaEncoding == null) {
return null;
}
if (!encodingsLoaded)
loadEncodings();
return javaEncodings.get(javaEncoding.toLowerCase());
}
/**
* Get size of a character for the specified InterBase encoding.
*
* @param iscEncoding InterBase encoding.
* @return maximum size of the character in bytes or 1 if encoding was
* not found.
*/
public static int getIscEncodingSize(String iscEncoding) {
if (iscEncoding == null) {
return 1;
}
if (!encodingSizesLoaded)
loadEncodingSizes();
Byte result = iscEncodingSizes.get(iscEncoding.toLowerCase());
if (result == null)
return 1;
else
return result.byteValue();
}
/**
* Get Java language encoding for given InterBase encoding.
*
* @param iscEncoding InterBase encoding
* @return corresponding Java encoding or null if none found.
*/
public static String getJavaEncoding(String iscEncoding) {
if (iscEncoding == null) {
return null;
}
if (!encodingsLoaded)
loadEncodings();
//
// very important for performance
// if javaEncoding is the default one, set to null
//
String javaEncoding = iscEncodings.get(iscEncoding.toLowerCase());
if (javaEncoding == null || javaEncoding.equalsIgnoreCase(defaultEncoding))
return null;
else
return javaEncoding;
}
/**
* Get Java language encoding for a given Java encoding alias.
*
* Ensures that naming is consistent even if a different alias was used.
*
*
* @param javaAlias Java alias for the encoding
* @return
*/
public static String getJavaEncodingForAlias(String javaAlias) {
if (javaAlias == null) {
return null;
}
if (!encodingsLoaded)
loadEncodings();
//
// very important for performance
// if javaEncoding is the default one, set to null
//
String javaEncoding = javaAliases.get(javaAlias.toLowerCase());
if (javaEncoding == null || javaEncoding.equalsIgnoreCase(defaultEncoding))
return null;
else
return javaEncoding;
}
public static CharacterTranslator getTranslator(String mappingPath) throws SQLException {
CharacterTranslator translator;
translator = (CharacterTranslator)translations.get(mappingPath);
if (translator == null) {
translator = new CharacterTranslator();
translator.init(mappingPath);
translations.put(mappingPath, translator);
}
return translator;
}
/**
* Load mapping between Java and InterBase encodings. This method loads the
* mapping using the classloader that loaded this class.
*/
private synchronized static void loadEncodings() {
if (encodingsLoaded)
return;
Properties props;
try {
props = loadProperties(ISC_ENCODINGS_RESOURCE);
} catch(IOException ioex) {
ioex.printStackTrace();
return;
}
// fill the direct and inversed mappings
for (Entry entry : props.entrySet()) {
String iscEncoding = (String) entry.getKey();
String javaEncoding = (String) entry.getValue();
iscEncodings.put(iscEncoding.toLowerCase(), javaEncoding);
// special handling for UTF8 and UNICODE_FSS encodings
// since UTF8 is an alias for UNICODE_FSS in Firebird 1.x
// it is safe to return UTF8 for all cases
if ("UNICODE_FSS".equals(iscEncoding))
continue;
Charset javaCharset = Charset.forName(javaEncoding);
// TODO: Remove iscEncoding if javaCharset is null?
// TODO: Replace mapping for iscEncoding to javaEncoding with canonical name?
String canonicalNameLowerCase = javaCharset.name().toLowerCase();
javaEncodings.put(canonicalNameLowerCase, iscEncoding);
javaAliases.put(canonicalNameLowerCase, javaEncoding);
for (String alias : javaCharset.aliases()) {
String lowerCaseAlias = alias.toLowerCase();
javaEncodings.put(lowerCaseAlias, iscEncoding);
javaAliases.put(lowerCaseAlias, javaEncoding);
}
}
encodingsLoaded = true;
}
/**
* Load mapping between Java and InterBase encodings. This method loads the
* mapping using the classloader that loaded this class.
*/
private synchronized static void loadEncodingSizes() {
if (encodingSizesLoaded)
return;
Properties props;
try {
props = loadProperties(ISC_ENCODING_SIZE_RESOURCE);
} catch(IOException ex) {
ex.printStackTrace();
return;
}
Iterator iterator = props.entrySet().iterator();
while(iterator.hasNext()) {
Map.Entry entry = (Map.Entry)iterator.next();
String iscEncoding = (String)entry.getKey();
String size = (String)entry.getValue();
byte byteSize = Byte.parseByte(size);
iscEncodingSizes.put(iscEncoding.toLowerCase(), Byte.valueOf(byteSize));
}
encodingSizesLoaded = true;
}
/**
* Load properties from the specified resource. This method uses the same
* class loader that loaded this class.
*
* @param resource path to the resource relative to the root of the
* classloader.
*
* @return instance of {@link Properties} containing loaded resources or
* null if resource was not found.
*
* @throws IOException if I/O error occured.
*/
private static Properties loadProperties(String resource) throws IOException {
ClassLoader cl = EncodingFactory.class.getClassLoader();
InputStream in = null;
// get the stream from the classloader or system classloader
if (cl == null)
in = ClassLoader.getSystemResourceAsStream(resource);
else
in = cl.getResourceAsStream(resource);
if (in == null)
return null;
try {
Properties props = new Properties();
props.load(in);
return props;
} finally {
in.close();
}
}
}