content: package net.sf.expectit;
  
  /*
   * #%L
   * ExpectIt
   * %%
   * Copyright (C) 2014 Alexey Gavrilov and contributors
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import static net.sf.expectit.Utils.toDebugString;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import java.nio.charset.Charset;
  import java.util.concurrent.Callable;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  /**
   * Performs copy from an input stream to a WritableByteChannel.
   */
  class InputStreamCopier implements Callable<Object> {
      private static final Logger LOG = Logger.getLogger(InputStreamCopier.class.getName());
  
      private final InputStream from;
      private final WritableByteChannel to;
      private final int bufferSize;
      private final Appendable echo;
      private final Charset charset;
      private final boolean autoFlushEcho;
  
      InputStreamCopier(
              final WritableByteChannel to,
              final InputStream from,
              final int bufferSize,
              final Appendable echo,
              final Charset charset,
              final boolean autoFlushEcho) {
          this.from = from;
          this.to = to;
          this.bufferSize = bufferSize;
          this.echo = echo;
          this.charset = charset;
          this.autoFlushEcho = autoFlushEcho;
      }
  
      @Override
      public Object call() throws Exception {
          byte[] buffer = new byte[bufferSize];
          int bytesRead;
          try {
              while ((bytesRead = from.read(buffer)) != -1) {
                  to.write(ByteBuffer.wrap(buffer, 0, bytesRead));
                  if (LOG.isLoggable(Level.FINE) && bytesRead > 0) {
                      LOG.fine(
                              String.format(
                                      "Received from %s: %s",
                                      from,
                                      toDebugString(buffer, bytesRead, charset)));
                  }
                  if (echo != null && bytesRead > 0) {
                      printEcho(buffer, bytesRead);
                  }
              }
          } finally {
              to.close();
          }
          return null;
      }
  
      private void printEcho(final byte[] buffer, final int bytesRead) throws IOException {
          if (charset == null) {
              if (echo instanceof OutputStream) {
                  ((OutputStream) echo).write(buffer, 0, bytesRead);
              } else {
                  echo.append(new String(buffer, 0, bytesRead, Charset.defaultCharset()));
              }
          } else {
              echo.append(new String(buffer, 0, bytesRead, charset));
          }
          if (autoFlushEcho) {
              Utils.flushAppendable(echo);
          }
      }
  
  }
  