Dispatcher.h

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/*
 * SPDX-FileCopyrightText: 2006-2021 Istituto Italiano di Tecnologia (IIT)
 * SPDX-FileCopyrightText: 2006-2010 RobotCub Consortium
 * SPDX-License-Identifier: BSD-3-Clause
 */
 
#ifndef YARP_OS_IMPL_DISPATCHER_H
#define YARP_OS_IMPL_DISPATCHER_H
 
#include <yarp/os/impl/LogComponent.h>
 
#include <cstdio>
#include <map>
#include <string>
#include <vector>
 
YARP_DECLARE_LOG_COMPONENT(DISPATCHER)
 
namespace yarp::os::impl {
 
template <class T, class RET>
class Dispatcher
{
private:
    class Entry
    {
    public:
        std::string name;
        RET (T::*fn)(int argc, char* argv[]);
 
        Entry(const char* name, RET (T::*fn)(int argc, char* argv[])) :
                name(name),
                fn(fn)
        {
        }
 
        Entry() :
                fn(nullptr)
        {
        }
    };
 
    std::map<std::string, Entry> action;
    std::vector<std::string> names;
 
public:
    void add(const char* name, RET (T::*fn)(int argc, char* argv[]))
    {
        Entry e(name, fn);
        action[std::string(name)] = e;
        // maintain a record of order of keys
        names.push_back(std::string(name));
    }
 
    RET dispatch(T* owner, const char* name, int argc, char* argv[])
    {
        std::string sname(name);
        typename std::map<std::string, Entry>::const_iterator it = action.find(sname);
        if (it != action.end()) {
            return (owner->*(it->second.fn))(argc, argv);
        } else {
            yCError(DISPATCHER, "Could not find command \"%s\"", name);
        }
        return RET();
    }
 
    std::vector<std::string> getNames()
    {
        return names;
    }
};
 
} // namespace yarp::os::impl
 
 
#endif // YARP_OS_IMPL_DISPATCHER_H