//===========================================================================
//  @(#) $Name: arts++-1-1-a12 $
//  @(#) $Id: ArtsAsMatrix.cc,v 1.2 2004/04/21 23:51:30 kkeys Exp $
//===========================================================================
//  Copyright Notice
//
//  By accessing this software, arts++, you are duly informed
//  of and agree to be bound by the conditions described below in this
//  notice:
//
//  This software product, arts++, is developed by Daniel W. McRobb, and
//  copyrighted(C) 1998 by the University of California, San Diego
//  (UCSD), with all rights reserved.  UCSD administers the CAIDA grant,
//  NCR-9711092, under which part of this code was developed.
//
//  There is no charge for arts++ software.  You can redistribute it
//  and/or modify it under the terms of the GNU Lesser General Public
//  License, Version 2.1, February 1999, which is incorporated by
//  reference herein.
//
//  arts++ is distributed WITHOUT ANY WARRANTY, IMPLIED OR EXPRESS, OF
//  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE or that the use
//  of it will not infringe on any third party's intellectual
//  property rights.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with arts++.  Copies can also be obtained from:
//
//    http://www.gnu.org/copyleft/lesser.html
//
//  or by writing to:
//
//  Free Software Foundation, Inc.
//  59 Temple Place, Suite 330
//  Boston, MA 02111-1307
//  USA
//
//  Or contact:
//
//    info@caida.org
//===========================================================================

#include <string>

#include "Arts.hh"
#include "ArtsAsMatrix.hh"

using namespace std;

static const std::string rcsid = "@(#) $Name: arts++-1-1-a12 $ $Id: ArtsAsMatrix.cc,v 1.2 2004/04/21 23:51:30 kkeys Exp $";

//-------------------------------------------------------------------------
//                       ArtsAsMatrix::ArtsAsMatrix()                      
//.........................................................................
//                                                                         
//-------------------------------------------------------------------------
ArtsAsMatrix::ArtsAsMatrix()
{
  this->Header().Identifier(artsC_OBJECT_AS_MATRIX);
  this->_data._asMatrix = new ArtsAsMatrixData();
  assert(this->_data._asMatrix != (ArtsAsMatrixData *)0);
}

//-------------------------------------------------------------------------
//                      ArtsAsMatrix::~ArtsAsMatrix()                      
//.........................................................................
//                                                                         
//-------------------------------------------------------------------------
ArtsAsMatrix::~ArtsAsMatrix()
{
}

//----------------------------------------------------------------------------
//                   std::istream & operator >> (std::istream & is, 
//                                          ArtsAsMatrix & artsAsMatrix) 
//............................................................................
//  Implementation note: we always look for the next ArtsAsMatrix object
//  in the input std::istream; we skip other kinds of Arts objects.
//----------------------------------------------------------------------------
std::istream & operator >> (std::istream & is,
                       ArtsAsMatrix & artsAsMatrix)
{
  std::streampos   streamPosition;
  ArtsHeader  artsHeader;

  //  save our stream position
  streamPosition = is.tellg();

  //  read the object header
  artsHeader.read(is);
  if (is.eof()) {
    return(is);
  }

  //  skip over objects that are not AS matrix objects
  while (artsHeader.Identifier() != artsC_OBJECT_AS_MATRIX) {
    is.seekg(artsHeader.AttrLength() + artsHeader.DataLength(),std::ios::cur);
    streamPosition = is.tellg();
    artsHeader.read(is);
    if (is.eof()) {
      break;
    }
  }

  //  if we reached the end of the file before finding an AS matrix object,
  //  just return the std::istream and don't touch artsAsMatrix
  if (is.eof()) {
    return(is);
  }

  //  back up to the start of the header and read the entire AS matrix
  //  object, then return the std::istream.
  is.seekg(streamPosition,std::ios::beg);
  artsAsMatrix.read(is);
  return(is);
}