Params.h

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#ifndef PARAMS_H
#define PARAMS_H

#include "Exceptions.h"
#include "xercesDomUtil.h"

BOREALIS_NAMESPACE_BEGIN;

class Params {
  public:
    enum Req {
        NOT_REQUIRED,
        REQUIRED,
        NON_EMPTY
    };

    Params() {}
    explicit Params(const DOMElement *elt) throw (AuroraBadEntityException) { addFromXml(elt); }
    void addFromXml(const DOMElement *elt) throw (AuroraBadEntityException);

    bool empty() const { return _params.empty(); }

    string param(string name, Req req = NOT_REQUIRED) const
        throw (AuroraBadEntityException);

    string param(string name, string def) const;

    template <typename T>
    bool typedParam(string name, T& value, Req req = NOT_REQUIRED) const
        throw (AuroraBadEntityException)
    {
        map<string, string>::const_iterator i = _params.find(name);

        if (i == _params.end()) {
            if (req != NOT_REQUIRED) {
                Throw(AuroraBadEntityException,
                      "Missing required attribute \"" + name + "\"");
            }
            return false;
        }

        // It's provided; coerce it
        istringstream iss(i->second);
        if (iss >> value)
            return true;

        Throw(AuroraBadEntityException,
              "Invalid format for parameter named \"" + name + "\": \"" +
              to_escaped_string(i->second) + "\"");
    }

    string as_string() const { return "Params" + to_string(_params); }

  private:
    map<string, string> _params;
};

BOREALIS_NAMESPACE_END;

#endif

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