SeContext.h

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/*
* Copyright Disney Enterprises, Inc.  All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License
* and the following modification to it: Section 6 Trademarks.
* deleted and replaced with:
*
* 6. Trademarks. This License does not grant permission to use the
* trade names, trademarks, service marks, or product names of the
* Licensor and its affiliates, except as required for reproducing
* the content of the NOTICE file.
*
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*/
#pragma once

#include <map>
#include <string>

class SeContext{
public:
        bool lookupParameter(const std::string& parameterName,std::string& value) const{
                ParameterMap::const_iterator it=_parameters.find(parameterName);
                if(it != _parameters.end()){value=it->second;return true;}
                else if(_parent) return _parent->lookupParameter(parameterName,value);
                else return false;
        }
        void setParameter(const std::string& parameterName,const std::string& value);
        SeContext* createChildContext() const;

        // Parent access uses pointers as it is acceptable to set/get a NULL parent
        void setParent(const SeContext* context) {_parent = context;}
        const SeContext* getParent() const {return _parent;}

        bool hasContext(const SeContext* context) const{
                if(this == context) return true;
                if(_parent) return _parent->hasContext(context);
                return false;
        }

        static SeContext& global();
private:
        SeContext(const SeContext&);
        SeContext& operator=(const SeContext&);

        SeContext(const SeContext* parent);
        const SeContext* _parent;

        // TODO: Use std::map until C++11 is ubiq.
        typedef std::map<std::string,std::string> ParameterMap;
        ParameterMap _parameters;
};