ParamFieldIterator.h

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/* -*- mode: c++ -*- */
//# ParamFieldIterator.h: Single field parameter iterator over Records
//# Copyright (C) 1997,1998,1999,2000,2001,2002,2003
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; 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: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
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#ifndef PARAM_FIELD_ITERATOR_H_
#define PARAM_FIELD_ITERATOR_H_

#include <casa/Containers/Record.h>
#include <iterator>

namespace casa {

class ParamFieldIterator
        : public std::iterator<std::forward_iterator_tag, Record *, int> {
        Record *record;
        String prefix;
        uInt field_index;

public:
        ParamFieldIterator()
                : record(nullptr)
                , prefix("")
                , field_index(0) {};

        ParamFieldIterator(Record *rec, const string &prefix = "")
                : record(rec)
                , prefix(String(prefix))
                , field_index(0) {};

        ParamFieldIterator(const ParamFieldIterator &fit)
                : record(fit.record)
                , prefix(fit.prefix)
                , field_index(fit.field_index) {};

        ParamFieldIterator & operator++() {
                ++field_index;
                return *this;
        };

        ParamFieldIterator operator++(int) {
                ParamFieldIterator tmp(*this);
                operator++();
                return tmp;
        };

        bool operator==(const ParamFieldIterator &rhs) {
                return record == rhs.record
                        && field_index == rhs.field_index
                        && prefix == rhs.prefix;
        };

        bool operator!=(const ParamFieldIterator &rhs) {
                return !operator==(rhs);
        };

        Record & operator*() {
                return record->rwSubRecord(prefix + String::toString(field_index));
        };

        static ParamFieldIterator begin(Record *rec, const string &prefix = "") {
                return ParamFieldIterator(rec, prefix);
        };

        static ParamFieldIterator end(Record *rec, const string &prefix = "") {
                ParamFieldIterator result(rec, prefix);
                result.field_index = rec->nfields();
                return result;
        };
};

}

#endif // FIELD_ITERATOR_H_