/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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.
 */
package com.orientechnologies.orient.enterprise.channel.binary;

import java.io.IOException;
import java.io.OutputStream;

/**
 * OutputStream class bound to a binary channel. Reuses the shared buffer of the channel.
 * 
 * @author Luca Garulli (l.garulli--at--orientechnologies.com)
 * 
 */
public class OChannelBinaryOutputStream extends OutputStream {
  private OChannelBinaryAsynchClient channel;
  private final byte[]               buffer;
  private int                        pos = 0;

  public OChannelBinaryOutputStream(final OChannelBinaryAsynchClient channel) {
    this.channel = channel;
    buffer = channel.getBuffer();
  }

  @Override
  public void write(final int iByte) throws IOException {
    if (pos >= buffer.length)
      flush(true);

    buffer[pos++] = (byte) iByte;
  }

  @Override
  public void close() throws IOException {
    flush(false);
    channel = null;
  }

  @Override
  public void flush() throws IOException {
    // flush(true);
  }

  private void flush(final boolean iContinue) throws IOException {
    channel.beginRequest();
    try {
      channel.out.writeInt(pos);
      if (pos > 0) {
        channel.out.write(buffer, 0, pos);
        pos = 0;
      }
      channel.out.writeByte(iContinue ? 1 : 0);

    } finally {
      channel.endRequest();
    }
  }
}
