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// -*- mode: c++; c-basic-offset:4 -*-
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// This file is part of libdap, A C++ implementation of the OPeNDAP Data
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// Access Protocol.
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// Copyright (c) 2014 OPeNDAP, Inc.
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// Author: James Gallagher <jgallagher@opendap.org>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
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#ifndef _D4RValue_h
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#define _D4RValue_h
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#include <vector>
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#include <string>
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#include <dods-datatypes.h>
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#include <D4Function.h>
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namespace libdap
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{
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class BaseType;
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class D4RValue;
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// Factory class to build RValue objects. User by the parser/ce-evaluator
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D4RValue *D4RValueFactory(std::string cpps);
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class D4RValueList
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{
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private:
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std::vector<D4RValue *> d_rvalues;
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void m_duplicate(const D4RValueList &src;;
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public:
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typedef std::vector<D4RValue *>::iterator iter;
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D4RValueList() { }
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D4RValueList(const D4RValueList &src) { m_duplicate(src); }
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D4RValueList(D4RValue *rv) { add_rvalue(rv); }
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virtual ~D4RValueList();
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void add_rvalue(D4RValue *rv) {
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d_rvalues.push_back(rv);
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}
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D4RValue *get_rvalue(unsigned int i) {
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return d_rvalues.at(i);
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}
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iter begin() { return d_rvalues.begin(); }
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iter end() { return d_rvalues.end(); }
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unsigned int size() const { return d_rvalues.size(); }
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};
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/**
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* Holds the RValues for the D4 function parser and for the filter
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* expression evaluator.
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*/
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class D4RValue
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{
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public:
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enum value_kind {
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unknown,
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basetype,
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function,
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constant
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};
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private:
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BaseType *d_variable; // This is a weak pointer; do not delete
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D4Function d_func; // (weak) pointer to a function returning BaseType *
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D4RValueList *d_args; // pointer to arguments to the function; delete
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BaseType *d_constant; // pointer; delete.
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value_kind d_value_kind;
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/** @brief Clone 'src' to 'this'. */
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void m_duplicate(const D4RValue &src;;
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friend class D4RValueList;
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public:
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D4RValue() : d_variable(0), d_func(0), d_args(0), d_constant(0), d_value_kind(unknown) { }
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D4RValue(const D4RValue &src) { m_duplicate(src); }
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D4RValue(BaseType *btp) : d_variable(btp), d_func(0), d_args(0), d_constant(0), d_value_kind(basetype) { }
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D4RValue(D4Function f, D4RValueList *args) : d_variable(0), d_func(f), d_args(args), d_constant(0), d_value_kind(function) { }
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D4RValue(unsigned long long ui);
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D4RValue(long long i);
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D4RValue(double r);
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D4RValue(std::string s);
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D4RValue(std::vector<dods_byte> &byte_args);
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D4RValue(std::vector<dods_int8> &byte_int8);
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D4RValue(std::vector<dods_uint16> &byte_uint16);
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D4RValue(std::vector<dods_int16> &byte_int16);
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D4RValue(std::vector<dods_uint32> &byte_uint32);
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D4RValue(std::vector<dods_int32> &byte_int32);
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D4RValue(std::vector<dods_uint64> &byte_uint64);
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D4RValue(std::vector<dods_int64> &byte_int64);
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D4RValue(std::vector<dods_float32> &byte_float32);
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D4RValue(std::vector<dods_float64> &byte_float64);
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virtual ~D4RValue();
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D4RValue &operator=(D4RValue &rhs) {
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if (this == &rhs)
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return *this;
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m_duplicate(rhs);
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return *this;
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}
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/**
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* @brief What kind of thing holds the value
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* Values in DAP4 constraints are either constants, dataset variables
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* or function results. It might be nice to know the source of a
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* given value in order to optimize the evaluation of certain kinds of
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* expressions.
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* @return The 'value_kind' of this value.
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*/
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value_kind get_kind() const { return d_value_kind; }
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// This is the call that will be used to return the value of a function.
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// jhrg 3/10/14
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virtual BaseType *value(DMR &dmr);
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// And this optimizes value() for filters, where functions are not supported.
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virtual BaseType *value();
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};
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} // namespace libdap
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#endif // _RValue_h
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