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/* Channels.java --

   Copyright (C) 2002, 2003, 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.nio.channels;

import gnu.java.nio.ChannelInputStream;

import gnu.java.nio.ChannelOutputStream;

import gnu.java.nio.ChannelReader;

import gnu.java.nio.InputStreamChannel;

import gnu.java.nio.OutputStreamChannel;

import gnu.java.nio.channels.FileChannelImpl;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.Reader;

import java.io.Writer;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.nio.charset.CharsetEncoder;

/**

 * @since 1.4

 */

public final class Channels

{

  /**

   * This class isn't intended to be instantiated.

   */

  private Channels()

  {

    // Do nothing here.

  }

  /**

   * Constructs a stream that reads bytes from the given channel.

   */

  public static InputStream newInputStream(ReadableByteChannel ch)

  {

    if (ch instanceof FileChannelImpl)

      return newInputStream((FileChannelImpl) ch);

    return new ChannelInputStream(ch);

  }

  /**

   * Constructs a stream that writes bytes to the given channel.

   */

  public static OutputStream newOutputStream(WritableByteChannel ch)

  {

    if (ch instanceof FileChannelImpl)

      return newOutputStream((FileChannelImpl) ch);

    return new ChannelOutputStream(ch);

  }

  static native FileInputStream newInputStream(FileChannelImpl ch);

  static native FileOutputStream newOutputStream(FileChannelImpl ch);

  /**

   * Constructs a channel that reads bytes from the given stream.

   */

  public static ReadableByteChannel newChannel(InputStream in)

  {

    return new InputStreamChannel(in);

  }

  /**

   * Constructs a channel that writes bytes to the given stream.

   */

  public static WritableByteChannel newChannel(OutputStream out)

  {

    return new OutputStreamChannel(out);

  }

  /**

   * Constructs a reader that decodes bytes from the given channel using the

   * given decoder.

   */

  public static Reader newReader(ReadableByteChannel ch, CharsetDecoder dec,

                                 int minBufferCap)

  {

    return new ChannelReader(ch, dec, minBufferCap);

  }

  /**

   * Constructs a reader that decodes bytes from the given channel according to

   * the named charset.

   *

   * @exception UnsupportedCharsetException If no support for the named charset

   * is available in this instance of the Java virtual machine.

   */

  public static Reader newReader(ReadableByteChannel ch, String csName)

  {

    return newReader(ch, Charset.forName(csName).newDecoder(), -1);

  }

  /**

   * Constructs a writer that encodes characters using the given encoder and

   * writes the resulting bytes to the given channel.

   */

  public static Writer newWriter(WritableByteChannel ch, CharsetEncoder enc,

                                 int minBufferCap)

  {

    // FIXME: implement java.nio.channels.Channel.newWriter(WritableByteChannel, CharsetEncoder, int) 

    throw new Error("not implemented");

  }

  /**

   * Constructs a writer that encodes characters according to the named charset

   * and writes the resulting bytes to the given channel.

   *

   * @exception UnsupportedCharsetException If no support for the named charset

   * is available in this instance of the Java virtual machine.

   */

  public static Writer newWriter(WritableByteChannel ch, String csName)

  {

    return newWriter(ch, Charset.forName(csName).newEncoder(), -1);

  }

}