/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/
//osgIntrospection - Copyright (C) 2005 Marco Jez

#ifndef OSGINTROSPECTION_PARAMETERINFO_
#define OSGINTROSPECTION_PARAMETERINFO_

#include <osgIntrospection/Type>
#include <osgIntrospection/Value>

#include <string>
#include <vector>

namespace osgIntrospection
{

    /// This class stores information about a function parameter. A parameter
    /// is defined by its name, its type, its position within the parameter
    /// list, and zero or more attributes. Attributes describe how the
    /// parameter behave, for example whether it is an input or an output
    /// parameter.
    class ParameterInfo
    {
    public:
        enum ParameterAttributes
        {
            NONE  = 0,

            IN    = 1,  // parameter is used to pass data to the function
            OUT   = 2,  // parameter is used to return data from the function

            INOUT = IN | OUT
        };

        /// Direct initialization constructor.
        inline ParameterInfo(const std::string& name, const Type& type, int attribs, const Value& defval = Value());

        /// Returns the parameter's name.
        inline const std::string& getName() const;

        /// Returns the parameter's type.
        inline const Type& getParameterType() const;

        /// Returns the parameter's attributes.
        inline int getAttributes() const;
        
        /// Returns the default value.
        inline const Value& getDefaultValue() const;

        /// Returns whether the parameter has the IN attribute.
        inline bool isIn() const { return (attribs_ & IN) != 0; }

        /// Returns whether the parameter has the OUT attribute.
        inline bool isOut() const { return (attribs_ & OUT) != 0; }

        /// Returns whether the parameter has both the IN and the 
        /// OUT attribute.
        inline bool isInOut() const { return isIn() && isOut(); }

    private:

        ParameterInfo& operator = (const ParameterInfo&) { return *this; }

        std::string _name;
        const Type& _type;
        int attribs_;
        Value default_;
    };

    // INLINE METHODS

    inline ParameterInfo::ParameterInfo(const std::string& name, const Type& type, int attribs, const Value& defval)
    :   _name(name),
        _type(type),
        attribs_(attribs),
        default_(defval)
    {
    }

    inline const std::string& ParameterInfo::getName() const
    {
        return _name;
    }

    inline const Type& ParameterInfo::getParameterType() const
    {
        return _type;
    }

    inline int ParameterInfo::getAttributes() const
    {
        return attribs_;
    }
    
    inline const Value& ParameterInfo::getDefaultValue() const
    {
        return default_;
    }

}

#endif
