simplemidi/include/Operations.h

#ifndef PADSELECTIONCONFIGURATION_H
#define PADSELECTIONCONFIGURATION_H

class MidiMessage;

#include <json/json.h>
class PadSelection;
class InputOperation
{
    public:
        enum OperationType {TRANSLATION, DROP, RANGE, REORDER};
        InputOperation(OperationType t) : m_type(t){}
        virtual ~InputOperation(){}

        virtual MidiMessage* execute(PadSelection*, MidiMessage* in, int i) const=0;

        OperationType get_type() const {return m_type;}

        static InputOperation* from_json(Json::Value&);

    protected:
        OperationType       m_type;
};

class TranslationOperation : public InputOperation
{
    public:
        enum Mode {FIXED, RELATIVE, UNCHANGED};
        TranslationOperation() : InputOperation(TRANSLATION){
            m_channel=m_key=m_velocity=0;
            m_channel_mode=m_key_mode=m_velocity_mode=RELATIVE;
        }
        TranslationOperation(Json::Value& v);
        virtual ~TranslationOperation(){}

        void set(int ch, int k, int vel){
            m_channel=ch;
            m_key=k;
            m_velocity=vel;
        }

        void set_mode(Mode ch, Mode k, Mode vel){
            if(ch!=UNCHANGED) m_channel_mode=ch;
            if(k!=UNCHANGED) m_key_mode=k;
            if(vel!=UNCHANGED) m_velocity_mode=vel;
        }

        virtual MidiMessage* execute(PadSelection*, MidiMessage* m, int i) const;
        static Mode parse_mode(const std::string& v);

    protected:
        Mode     m_channel_mode;
        int      m_channel;
        Mode     m_key_mode;
        int      m_key;
        Mode     m_velocity_mode;
        int      m_velocity;

};


class DropOperation : public InputOperation
{
    public:
        enum Mode {FIXED, RELATIVE, UNCHANGED};
        DropOperation() : InputOperation(DROP){
        }
        virtual ~DropOperation(){}

        virtual MidiMessage* execute(PadSelection*, MidiMessage* m, int i) const {return NULL;}

    protected:
};

class ReorderOperation : public InputOperation
{
    public:
        ReorderOperation() : InputOperation(REORDER){
            m_offset=0;
        }
        ReorderOperation(Json::Value& v);
        virtual ~ReorderOperation(){}

        virtual MidiMessage* execute(PadSelection*, MidiMessage* m, int i) const ;

    protected:
        int     m_offset;
};



class RangeOperation : public InputOperation
{
    public:
        RangeOperation() : InputOperation(RANGE){
        }
        RangeOperation(Json::Value& v) : InputOperation(RANGE)
        {
            m_key = v["key"].asInt();
            m_length = v["length"].asInt();
            Json::Value a = v["range"];
            int s = a.size();
            for(int i=0; i<s; i++) m_range.push_back(a[i].asInt());
        }
        virtual ~RangeOperation(){}

        virtual MidiMessage* execute(PadSelection*, MidiMessage* m, int i) const;

    protected:
        std::vector<int>            m_range;
        int                         m_key;
        int                         m_length;
};





#endif // PADSELECTIONCONFIGURATION_H