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A barebones WebSocket client and server implementation written 100% in Java
There is a newer version: 1.5.7
/*
 * Copyright (c) 2010-2020 Nathan Rajlich
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use,
 *  copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following
 *  conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 */

package org.java_websocket;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import java.nio.channels.SocketChannel;

/**
 * @deprecated
 */
@Deprecated
public class AbstractWrappedByteChannel implements WrappedByteChannel {

  private final ByteChannel channel;

  /**
   * @deprecated
   */
  @Deprecated
  public AbstractWrappedByteChannel(ByteChannel towrap) {
    this.channel = towrap;
  }

  /**
   * @deprecated
   */
  @Deprecated
  public AbstractWrappedByteChannel(WrappedByteChannel towrap) {
    this.channel = towrap;
  }

  @Override
  public int read(ByteBuffer dst) throws IOException {
    return channel.read(dst);
  }

  @Override
  public boolean isOpen() {
    return channel.isOpen();
  }

  @Override
  public void close() throws IOException {
    channel.close();
  }

  @Override
  public int write(ByteBuffer src) throws IOException {
    return channel.write(src);
  }

  @Override
  public boolean isNeedWrite() {
    return channel instanceof WrappedByteChannel && ((WrappedByteChannel) channel).isNeedWrite();
  }

  @Override
  public void writeMore() throws IOException {
    if (channel instanceof WrappedByteChannel) {
      ((WrappedByteChannel) channel).writeMore();
    }

  }

  @Override
  public boolean isNeedRead() {
    return channel instanceof WrappedByteChannel && ((WrappedByteChannel) channel).isNeedRead();

  }

  @Override
  public int readMore(ByteBuffer dst) throws IOException {
    return channel instanceof WrappedByteChannel ? ((WrappedByteChannel) channel).readMore(dst) : 0;
  }

  @Override
  public boolean isBlocking() {
    if (channel instanceof SocketChannel) {
      return ((SocketChannel) channel).isBlocking();
    } else if (channel instanceof WrappedByteChannel) {
      return ((WrappedByteChannel) channel).isBlocking();
    }
    return false;
  }

}