D4Sequence.h

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// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2013 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
#ifndef _d4sequence_h
#define _d4sequence_h 1
 
#include "Constructor.h"
 
// DAP2 Sequence supported subsetting using the array notation. This might
// be introduced into DAP4 later on.
#define INDEX_SUBSETTING 0
 
class Crc32;
 
namespace libdap {
class BaseType;
class D4FilterClauseList;

typedef vector<BaseType *> D4SeqRow;

typedef vector<D4SeqRow *> D4SeqValues;

typedef vector<BaseType *> BaseTypeRow;

typedef vector<BaseTypeRow *> SequenceValues;

 
class D4Sequence : public Constructor {
private:
    // This may be zero (nullptr) but the accessor (clauses()) allocates an
    // instance if that is the case.
    D4FilterClauseList *d_clauses;
 
    // Use this to control if ptr_duplicate(), ..., copy the filter clauses.
    // Because the values of a child sequence are held in copies of the Seq
    // object they clauses will be bound to the 'master' instance will be copied
    // but the copies will never be used. This field can be used to control
    // that. ...purely an optimization.
    bool d_copy_clauses;
 
protected:
    // This holds the values of the sequence. Values are stored in
    // instances of BaseTypeRow objects which hold instances of BaseType.
    //
    // Allow these values to be accessed by subclasses
    D4SeqValues d_values;
 
    int64_t d_length; // How many elements are in the sequence; -1 if not currently known
 
#if INDEX_SUBSETTING
    int d_starting_row_number;
    int d_row_stride;
    int d_ending_row_number;
#endif
 
    void m_duplicate(const D4Sequence &s);
 
    // Specialize this if you have a data source that requires read()
    // recursively call itself for child sequences.
    void read_sequence_values(bool filter);
 
    friend class D4SequenceTest;
 
public:
    D4Sequence(const string &n);
    D4Sequence(const string &n, const string &d);
 
    D4Sequence(const D4Sequence &rhs);
 
    virtual ~D4Sequence();
 
    D4Sequence &operator=(const D4Sequence &rhs);
 
    BaseType *ptr_duplicate() override;
 
    void clear_local_data() override;

    int length() const override { return (int)d_length; }

    void set_length(int64_t count) override { d_length = count; }
    // FIXME length() and set_length()
 
    virtual bool read_next_instance(bool filter);
 
    void intern_data(ConstraintEvaluator &, DDS &) override {
        throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
    }
    bool serialize(ConstraintEvaluator &, DDS &, Marshaller &, bool) override {
        throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
    }
    bool deserialize(UnMarshaller &, DDS *, bool) override {
        throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
    }
 
    // DAP4
    void intern_data() override;
    void serialize(D4StreamMarshaller &m, DMR &dmr, bool filter = false) override;
    void deserialize(D4StreamUnMarshaller &um, DMR &dmr) override;
 
    D4FilterClauseList &clauses();
 
#if INDEX_SUBSETTING
    virtual int get_starting_row_number() const { return d_starting_row_number; }

    virtual int get_row_stride() const { return d_row_stride; }

    virtual int get_ending_row_number() const { return d_ending_row_number; }
 
    virtual void set_row_number_constraint(int start, int stop, int stride = 1);
#endif

    virtual void set_value(D4SeqValues &values) {
        d_values = values;
        d_length = d_values.size();
    }

    virtual D4SeqValues value() const { return d_values; }

    virtual D4SeqValues &value_ref() { return d_values; }
 
    virtual D4SeqRow *row_value(size_t row);
    virtual BaseType *var_value(size_t row, const string &name);
    virtual BaseType *var_value(size_t row, size_t i);
 
    virtual void print_one_row(ostream &out, int row, string space, bool print_row_num = false);
    virtual void print_val_by_rows(ostream &out, string space = "", bool print_decl_p = true,
                                   bool print_row_numbers = true);
    void print_val(ostream &out, string space = "", bool print_decl_p = true) override;
 
    void dump(ostream &strm) const override;
};
 
} // namespace libdap
 
#endif //_sequence_h