VariableBase.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
 
 
 
#ifndef DRAIN_VARIABLE_BASE
#define DRAIN_VARIABLE_BASE
 
#include "Castable.h"
#include "CastableIterator.h"
 
#include "VariableT.h"
 
 
namespace drain {
 
 
 
class VariableBase : public Castable {
 
public:
 
    // Like in images. Should be fixed.
    typedef CastableIterator const_iterator;
    typedef CastableIterator iterator;
 
    //typedef std::pair<const char *,const drain::VariableBase> init_pair_t;
 
 
    virtual inline
    ~VariableBase(){};
 
 
    virtual inline // true also if ptr == null
    bool isLinking() const {
        if (caster.ptr == nullptr){
            return false;
        }
        else if (data.empty()){ // this is never true
            return true;
        }
        else {
            return (caster.ptr != (void *) &data[0]);
            /*
            if (caster.ptr != (void *) &data[0]){ // Debugging
                std::cerr << __FILE__ << ':' << __LINE__ << ':' << __FUNCTION__ << " non-empty data [" << getTypeName() << "], but pointer discarding it " << std::endl;
                std::cerr << __FILE__ << ':' << __LINE__ << ':' << __FUNCTION__ << " value: '" << *this << "'" << std::endl;
                //info(std::cerr);
            }
            return false;
            */
        }
 
    }
 
 
    virtual inline
    bool isVariable() const {
        return true;
    }
 
 
 
    virtual inline
    bool isLinkable() const {
        return false;
    }
 
 
 
 
 
    //template <class T>
    VariableBase & append(){
        return *this;
    }
 
    template <class T, class ...TT>
    VariableBase & append(const T &x, const TT& ...rest){
        Castable::operator<<(x);
        append(rest...);
        return *this;
    }
 
    template <class T, class ...TT>
    VariableBase & set(const T &x, const TT& ...rest){
        clear();
        (*this) = x;
        return append(rest...);
    }
 
    /*
    inline
    void reset(){
        caster.unsetType();
        //resize(0);
        updateSize(0);
        setSeparator(',');
        //this->separator = ','; // semantics ?
    }
    */
 
 
    virtual
    void setType(const std::type_info & t);
 
 
 
    /*
     *  Note: if a std::string is given, does not split it like with Variable::operator=(const char *).
     */
    template <class T>
    inline
    VariableBase &operator<<(const T &x){
        //Castable::operator<<(x);
        append(x);
        return *this;
    }
 
 
 
 
    inline
    const CastableIterator & begin() const { return dataBegin; };
 
    /*
     *  Notice: in the case of std::strings, will iterate through characters.
     */
    inline
    const CastableIterator & end() const { return dataEnd; };
 
 
 
//protected:
 
 
 
    virtual inline
    bool setSize(size_t elementCount){
        // TODO: if is reference?
        //return updateSize(elementCount); // fix/check: always returns true?
        updateSize(elementCount);
        return true;
    }
 
protected:
 
 
    /***
     *   This is the basic design pattern for all the VariableLikes
    template <class ...TT>
    inline
    VariableBase(const TT & ...args) {
        init(args...); //
    }
     */
 
    virtual
    void updateSize(size_t elementCount);
 
private:
 
    std::vector<char> data;
 
    mutable CastableIterator dataBegin;
    mutable CastableIterator dataEnd;
 
 
private:
 
    void updateIterators();
 
};
 
/*
template <class T>
class VariableT<T>;
*/
 
template <class V>
class VariableInitializer : public V {
 
protected:
 
    /*
    template <class T>
    void init(const VariableInitializer<V> & value) {
        std::cerr << __FILE__ << ':' << __LINE__ << ':' << __FUNCTION__ << " " << value << '[' << typeid(T).name() << ']'<< std::endl;
        this->reset();
        this->assignCastable(value);
    }
    */
 
 
 
    template <class T>
    void init(const VariableT<T> & value) {
        // drain::Logger(__FILE__, __LINE__, __FUNCTION__).warn(drain::TypeName<VariableT<VariableInitializer<V> > >::str(),
        //      '(', drain::TypeName<VariableT<T> >::str(), ' ', value, ')');
        this->reset();
        this->assignCastable(value);
    }
 
    template <class T>
    void init(VariableT<T> & value) {
        // drain::Logger(__FILE__, __LINE__, __FUNCTION__).warn(drain::TypeName<VariableT<VariableInitializer<V> > >::str(),
        //      '(', drain::TypeName<VariableT<T> >::str(), ' ', value, ')');
        this->reset();
        if (value.isLinking() && this->isLinkable()){
            this->relink(value);
            // this->setPtr(value.getPtr(), value.getType(), value.getElementCount());
        }
        this->assignCastable(value);
    }
 
 
    /*
    template <class D>
    void init(const D & dst){
        reset();
        assign(dst);
    }
    */
    inline
    void init(const std::type_info &t = typeid(void)) {
        this->reset();
        this->setType(t);
    };
 
    // Initialisation, using type of argument or explicit type argument.
    // Copies type, data and separator char. Fails with Reference?
    template <class T>
    void init(const T & value) {
        // std::cerr << __FILE__ << ':' << __LINE__ << ':' << __FUNCTION__ << " " << value << '[' << typeid(T).name() << ']'<< std::endl;
        // std::cerr << __LINE__ << " reset: " << std::endl;
        this->reset();
        // std::cerr << __LINE__ << " assign: " << std::endl;
        this->assign(value); // Critical, direct assignment *this = value fails
        // std::cerr << __LINE__ << " ...done " << std::endl;
    }
 
 
    template <class T>
    void init(const T & value, const std::type_info &t) { //  = typeid(void)
        std::cerr << __FILE__ << ':' << __LINE__ << ':' << __FUNCTION__ << " " << value << '[' << t.name() << ']' << std::endl;
 
        std::cerr << __LINE__ << " reset: " << std::endl;
        this->reset();
        std::cerr << __LINE__ << " setType: " << std::endl;
        this->setType(t);
        std::cerr << __LINE__ << " assign: " << std::endl;
        this->assign(value); // Critical, direct assignment *this = value fails
        std::cerr << __LINE__ << " ...done " << std::endl;
        // ;
    }
 
 
    inline
    void init(const VariableBase & v) {
        std::cerr << __FILE__ << ':' << __LINE__ << __FUNCTION__ << " " << v << std::endl;
        this->reset();
        this->outputSeparator = v.outputSeparator;
        this->inputSeparator = v.inputSeparator;
        this->assignCastable(v);
    };
 
    inline
    void init(const Castable & c) {
        std::cerr << __FILE__ << ':' << __LINE__ << __FUNCTION__ << " " << c << std::endl;
        this->reset();
        //this->outputSeparator = c.outputSeparator;
        //this->inputSeparator  = c.inputSeparator;
        this->assignCastable(c);
    };
 
    inline
    void init(const char * s) {
        // std::cerr << __FILE__ << ':' << __LINE__ << __FUNCTION__ << " " << s << std::endl;
        this->reset();
        this->assignString(s);
    };
 
    template<typename T>
    inline
    void init(std::initializer_list<T> l, const std::type_info &t = typeid(void)) {
        // std::cerr << __FILE__ << ':' << __LINE__ << __FUNCTION__ << " " << std::endl;
        this->reset();
        this->setType(t);
        this->assignContainer(l, true);
    };
 
    template <class ...TT>
    void init(const TT& ...args){
        std::cerr << __FILE__ << ':' << __LINE__ << __FUNCTION__ << " (variadic args)" << std::endl;
        this->reset();
        this->append(args...);
    }
 
};
 
}
 
#endif