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/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.convert;
public abstract class UnicodeToBytes
{
/** Buffer to emit bytes to.
* The locations buf[count] ... buf[buf.length-1] are available. */
public byte[] buf;
public int count;
static Class defaultEncodingClass;
static synchronized void getDefaultEncodingClass()
{
// Test (defaultEncodingClass == null) again in case of race condition.
if (defaultEncodingClass == null)
{
String encoding = System.getProperty("file.encoding");
String className = "gnu.gcj.convert.Output_"+encoding;
try
{
defaultEncodingClass = Class.forName(className);
}
catch (ClassNotFoundException ex)
{
throw new NoClassDefFoundError("missing default encoding "
+ encoding + " (class "
+ className + " not found)");
}
}
}
public abstract String getName();
public static UnicodeToBytes getDefaultEncoder()
{
try
{
if (defaultEncodingClass == null)
getDefaultEncodingClass();
return (UnicodeToBytes) defaultEncodingClass.newInstance();
}
catch (Throwable ex)
{
return new Output_8859_1();
}
}
/** Get a char-stream->byte-stream converter given an encoding name. */
public static UnicodeToBytes getEncoder (String encoding)
throws java.io.UnsupportedEncodingException
{
String className = "gnu.gcj.convert.Output_"+encoding;
Class encodingClass;
try
{
encodingClass = Class.forName(className);
return (UnicodeToBytes) encodingClass.newInstance();
}
catch (Throwable ex)
{
throw new java.io.UnsupportedEncodingException(encoding + " ("
+ ex + ')');
}
}
public final void setOutput(byte[] buffer, int count)
{
this.buf = buffer;
this.count = count;
}
/** Convert chars to bytes.
* Converted bytes are written to buf, starting at count.
* @param inbuffer source of characters to convert
* @param inpos index of initial character in inbuffer to convert
* @param inlength number of characters to convert
* @return number of chars converted
* Also, this.count is increment by the number of bytes converted.
*/
public abstract int write (char[] inbuffer, int inpos, int inlength);
/** Convert chars to bytes.
* Converted bytes are written to buf, starting at count.
* @param str source of characters to convert
* @param inpos index of initial character in str to convert
* @param inlength number of characters to convert
* @param work if non-null, a buffer than can be used
* @return number of chars converted
* Also, this.count is increment by the number of bytes converted.
*/
public int write (String str, int inpos, int inlength, char[] work)
{
if (work == null)
work = new char[inlength];
int srcEnd = inpos + (inlength > work.length ? work.length : inlength);
str.getChars(inpos, srcEnd, work, 0);
return write(work, inpos, inlength);
}
}
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