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org/apache/lucene/store/BufferedIndexInput.java

setBufferSize(int)

class BufferedIndexInput {
  /** Change the buffer size used by this IndexInput */
  public void setBufferSize(int newSize) {
    assert buffer == null || bufferSize == buffer.length: "buffer=" + buffer + " bufferSize=" + bufferSize + " buffer.length=" + (buffer != null ? buffer.length : 0);
    if (newSize != bufferSize) {
      checkBufferSize(newSize);
      bufferSize = newSize;
      if (buffer != null) {
        // Resize the existing buffer and carefully save as
        // many bytes as possible starting from the current
        // bufferPosition
        byte[] newBuffer = new byte[newSize];
        final int leftInBuffer = bufferLength-bufferPosition;
        final int numToCopy;
        if (leftInBuffer > newSize)
          numToCopy = newSize;
        else
          numToCopy = leftInBuffer;
        System.arraycopy(buffer, bufferPosition, newBuffer, 0, numToCopy);
        bufferStart += bufferPosition;
        bufferPosition = 0;
        bufferLength = numToCopy;
        newBuffer(newBuffer);
      }
    }
  }

}