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/* Copyright (C) 2005 Free Software Foundation
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;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.CoderResult;
import gnu.java.nio.charset.EncodingHelper;
/**
* Adaptor class that allow any {@link Charset} to be used
* as a BytesToUnicode converter.
*/
public class BytesToCharsetAdaptor extends BytesToUnicode
{
/**
* The CharsetDecoder that does all the work.
*/
private final CharsetDecoder decoder;
/**
* ByteBuffer wrapper for this.buf.
*/
private ByteBuffer inBuf;
/**
* Create a new BytesToCharsetAdaptor for the given Charset.
*
* @param cs the Charset.
*/
public BytesToCharsetAdaptor(Charset cs)
{
this(cs.newDecoder());
}
/**
* Create a new BytesToCharsetAdaptor for the given CharsetDecoder.
*
* @param dec the CharsetDecoder.
*/
public BytesToCharsetAdaptor(CharsetDecoder dec)
{
decoder = dec;
// Use default replacments on bad input so that we don't have to
// deal with errors.
decoder.onMalformedInput(CodingErrorAction.REPLACE);
decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
}
/**
* Return the decoder's name. The backing Charset's name is
* returned.
*
* @return The name.
*/
public String getName()
{
return EncodingHelper.getOldCanonical(decoder.charset().name());
}
public int read(char[] outbuffer, int outpos, int count)
{
if (inBuf == null || ! inBuf.hasArray() || inBuf.array() != inbuffer)
inBuf = ByteBuffer.wrap(inbuffer);
inBuf.limit(inpos + inlength);
inBuf.position(inpos);
CharBuffer outBuf = CharBuffer.wrap(outbuffer, outpos, count);
decoder.decode(inBuf, outBuf, false);
// Update this.inpos to reflect the bytes consumed.
inpos = inBuf.position();
// Return the number of characters that were written to outbuffer.
return outBuf.position() - outpos;
}
// These aren't cached.
public void done()
{
}
}
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