LogFilterExpr.h

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// # LogFilterExpr.h: Class to deal with a TaQL expression to filter messages
// # Copyright (C) 2000
// # Associated Universities, Inc. Washington DC, USA.
// #
// # This program is free software; you can redistribute it and/or modify it
// # under the terms of the GNU General Public License as published by the Free
// # Software Foundation; either version 2 of the License, or (at your option)
// # any later version.
// #
// # This program is distributed in the hope that it will be useful, but WITHOUT
// # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
// # more details.
// #
// # You should have received a copy of the GNU General Public License along
// # with this program; if not, write to the Free Software Foundation, Inc.,
// # 675 Massachusetts Ave, Cambridge, MA 02139, USA.
// #
// # Correspondence concerning AIPS++ should be addressed as follows:
// #        Internet email: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef TABLES_LOGFILTEREXPR_H
#define TABLES_LOGFILTEREXPR_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/tables/TaQL/TableExprData.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// # Forward Declarations
class TableExprNode;
class LogMessage;
 
// <summary>
// Class to deal with a TaQL expression to filter messages.
// </summary>
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="" demos="">
// </reviewed>
 
// This program tests the class TableExprData.
// This example shows how a data set consisting of two vectors
// of scalars can be used.
 
class LogFilterExpr : public TableExprData {
 public:
  // Construct it from an expression which gets parsed.
  LogFilterExpr(const String& expr);
 
  // Copy constructor (copy semantics).
  LogFilterExpr(const LogFilterExpr&);
 
  virtual ~LogFilterExpr();
 
  // Assignment (copy semantics).
  LogFilterExpr& operator=(const LogFilterExpr&);
 
  // Does this message match the expression?
  Bool matches(const LogMessage& message);
 
  // Get the data.
  // <group>
  virtual Double getDouble(const Block<Int>& fieldNrs) const;
  virtual String getString(const Block<Int>& fieldNrs) const;
  // </group>
 
  // Get the data type of the various values.
  virtual DataType dataType(const Block<Int>& fieldNrs) const;
 
 private:
  TableExprNode* itsExpr;
  const LogMessage* itsMessage;
};
 
}  // namespace casacore
 
#endif