@Override
  public void get(byte[] dst, int offset, int length) {
    checkRefCount();
    ByteBufferUtils.copyFromBufferToArray(dst, buf, buf.position(), offset, length);
    buf.position(buf.position() + length);
  }
An implementation of ByteBuff where a single BB backs the BBI. This just acts as a wrapper over a
normal BB - offheap or onheap
hbase-common/src/main/java/org/apache/hadoop/hbase/nio/SingleByteBuff.java