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package com.sun.org.apache.xml.internal.serialize;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import com.sun.org.apache.xerces.internal.util.EncodingMap;
/**
* This class represents an encoding.
*
* @version $Id: EncodingInfo.java,v 1.8 2010-11-01 04:40:36 joehw Exp $
*/
public class EncodingInfo {
// An array to hold the argument for a method of Charset, CharsetEncoder or CharToByteConverter.
private Object [] fArgsForMethod = null;
// name of encoding as registered with IANA;
// preferably a MIME name, but aliases are fine too.
String ianaName;
String javaName;
int lastPrintable;
// The CharsetEncoder with which we test unusual characters.
Object fCharsetEncoder = null;
// The CharToByteConverter with which we test unusual characters.
Object fCharToByteConverter = null;
// Is the converter null because it can't be instantiated
// for some reason (perhaps we're running with insufficient authority as
// an applet?
boolean fHaveTriedCToB = false;
// Is the charset encoder usable or available.
boolean fHaveTriedCharsetEncoder = false;
/**
* Creates new EncodingInfo instance.
*/
public EncodingInfo(String ianaName, String javaName, int lastPrintable) {
this.ianaName = ianaName;
this.javaName = EncodingMap.getIANA2JavaMapping(ianaName);
this.lastPrintable = lastPrintable;
}
/**
* Returns a MIME charset name of this encoding.
*/
public String getIANAName() {
return this.ianaName;
}
/**
* Returns a writer for this encoding based on
* an output stream.
*
* @return A suitable writer
* @exception UnsupportedEncodingException There is no convertor
* to support this encoding
*/
public Writer getWriter(OutputStream output)
throws UnsupportedEncodingException {
// this should always be true!
if (javaName != null)
return new OutputStreamWriter(output, javaName);
javaName = EncodingMap.getIANA2JavaMapping(ianaName);
if(javaName == null)
// use UTF-8 as preferred encoding
return new OutputStreamWriter(output, "UTF8");
return new OutputStreamWriter(output, javaName);
}
/**
* Checks whether the specified character is printable or not in this encoding.
*
* @param ch a code point (0-0x10ffff)
*/
public boolean isPrintable(char ch) {
if (ch <= this.lastPrintable) {
return true;
}
return isPrintable0(ch);
}
/**
* Checks whether the specified character is printable or not in this encoding.
* This method accomplishes this using a java.nio.CharsetEncoder. If NIO isn't
* available it will attempt use a sun.io.CharToByteConverter.
*
* @param ch a code point (0-0x10ffff)
*/
private boolean isPrintable0(char ch) {
// Attempt to get a CharsetEncoder for this encoding.
if (fCharsetEncoder == null && CharsetMethods.fgNIOCharsetAvailable && !fHaveTriedCharsetEncoder) {
if (fArgsForMethod == null) {
fArgsForMethod = new Object [1];
}
// try and create the CharsetEncoder
try {
fArgsForMethod[0] = javaName;
Object charset = CharsetMethods.fgCharsetForNameMethod.invoke(null, fArgsForMethod);
if (((Boolean) CharsetMethods.fgCharsetCanEncodeMethod.invoke(charset, (Object[]) null)).booleanValue()) {
fCharsetEncoder = CharsetMethods.fgCharsetNewEncoderMethod.invoke(charset, (Object[]) null);
}
// This charset cannot be used for encoding, don't try it again...
else {
fHaveTriedCharsetEncoder = true;
}
}
catch (Exception e) {
// don't try it again...
fHaveTriedCharsetEncoder = true;
}
}
// Attempt to use the CharsetEncoder to determine whether the character is printable.
if (fCharsetEncoder != null) {
try {
fArgsForMethod[0] = new Character(ch);
return ((Boolean) CharsetMethods.fgCharsetEncoderCanEncodeMethod.invoke(fCharsetEncoder, fArgsForMethod)).booleanValue();
}
catch (Exception e) {
// obviously can't use this charset encoder; possibly a JDK bug
fCharsetEncoder = null;
fHaveTriedCharsetEncoder = false;
}
}
// As a last resort try to use a sun.io.CharToByteConverter to
// determine whether this character is printable. We will always
// reach here on JDK 1.3 or below.
if (fCharToByteConverter == null) {
if (fHaveTriedCToB || !CharToByteConverterMethods.fgConvertersAvailable) {
// forget it; nothing we can do...
return false;
}
if (fArgsForMethod == null) {
fArgsForMethod = new Object [1];
}
// try and create the CharToByteConverter
try {
fArgsForMethod[0] = javaName;
fCharToByteConverter = CharToByteConverterMethods.fgGetConverterMethod.invoke(null, fArgsForMethod);
}
catch (Exception e) {
// don't try it again...
fHaveTriedCToB = true;
return false;
}
}
try {
fArgsForMethod[0] = new Character(ch);
return ((Boolean) CharToByteConverterMethods.fgCanConvertMethod.invoke(fCharToByteConverter, fArgsForMethod)).booleanValue();
}
catch (Exception e) {
// obviously can't use this converter; probably some kind of
// security restriction
fCharToByteConverter = null;
fHaveTriedCToB = false;
return false;
}
}
// is this an encoding name recognized by this JDK?
// if not, will throw UnsupportedEncodingException
public static void testJavaEncodingName(String name) throws UnsupportedEncodingException {
final byte [] bTest = {(byte)'v', (byte)'a', (byte)'l', (byte)'i', (byte)'d'};
String s = new String(bTest, name);
}
/**
* Holder of methods from java.nio.charset.Charset and java.nio.charset.CharsetEncoder.
*/
static class CharsetMethods {
// Method: java.nio.charset.Charset.forName(java.lang.String)
private static java.lang.reflect.Method fgCharsetForNameMethod = null;
// Method: java.nio.charset.Charset.canEncode()
private static java.lang.reflect.Method fgCharsetCanEncodeMethod = null;
// Method: java.nio.charset.Charset.newEncoder()
private static java.lang.reflect.Method fgCharsetNewEncoderMethod = null;
// Method: java.nio.charset.CharsetEncoder.canEncode(char)
private static java.lang.reflect.Method fgCharsetEncoderCanEncodeMethod = null;
// Flag indicating whether or not java.nio.charset.* is available.
private static boolean fgNIOCharsetAvailable = false;
private CharsetMethods() {}
// Attempt to get methods for Charset and CharsetEncoder on class initialization.
static {
try {
Class charsetClass = Class.forName("java.nio.charset.Charset");
Class charsetEncoderClass = Class.forName("java.nio.charset.CharsetEncoder");
fgCharsetForNameMethod = charsetClass.getMethod("forName", new Class [] {String.class});
fgCharsetCanEncodeMethod = charsetClass.getMethod("canEncode", new Class [] {});
fgCharsetNewEncoderMethod = charsetClass.getMethod("newEncoder", new Class [] {});
fgCharsetEncoderCanEncodeMethod = charsetEncoderClass.getMethod("canEncode", new Class [] {Character.TYPE});
fgNIOCharsetAvailable = true;
}
// ClassNotFoundException, NoSuchMethodException or SecurityException
// Whatever the case, we cannot use java.nio.charset.*.
catch (Exception exc) {
fgCharsetForNameMethod = null;
fgCharsetCanEncodeMethod = null;
fgCharsetEncoderCanEncodeMethod = null;
fgCharsetNewEncoderMethod = null;
fgNIOCharsetAvailable = false;
}
}
}
/**
* Holder of methods from sun.io.CharToByteConverter.
*/
static class CharToByteConverterMethods {
// Method: sun.io.CharToByteConverter.getConverter(java.lang.String)
private static java.lang.reflect.Method fgGetConverterMethod = null;
// Method: sun.io.CharToByteConverter.canConvert(char)
private static java.lang.reflect.Method fgCanConvertMethod = null;
// Flag indicating whether or not sun.io.CharToByteConverter is available.
private static boolean fgConvertersAvailable = false;
private CharToByteConverterMethods() {}
// Attempt to get methods for char to byte converter on class initialization.
static {
try {
Class clazz = Class.forName("sun.io.CharToByteConverter");
fgGetConverterMethod = clazz.getMethod("getConverter", new Class [] {String.class});
fgCanConvertMethod = clazz.getMethod("canConvert", new Class [] {Character.TYPE});
fgConvertersAvailable = true;
}
// ClassNotFoundException, NoSuchMethodException or SecurityException
// Whatever the case, we cannot use sun.io.CharToByteConverter.
catch (Exception exc) {
fgGetConverterMethod = null;
fgCanConvertMethod = null;
fgConvertersAvailable = false;
}
}
}
}