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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()

  {

  }

}