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/*
* File: OptionDictionary.h
*
* Copyright (c) Freescale Semiconductor, Inc. All rights reserved.
* See included license file for license details.
*/
#if !defined(_OptionDictionary_h_)
#define _OptionDictionary_h_
#include "OptionContext.h"
#include <map>
namespace elftosb
{
/*!
* \brief Concrete implementation of OptionContext.
*
* This context subclass supports having a parent context. If an option is not
* found in the receiving instance, the request is passed to the parent.
* The hasOption() and getOption() methods will ask up the parent chain
* if the requested option does not exist in the receiving instance.
* But the setOption() and deleteOption() methods only operate locally,
* on the instance on which they were called. This allows a caller to
* locally override an option value without affecting any of the parent
* contexts.
*/
class OptionDictionary : public OptionContext
{
public:
//! \brief Default constructor.
OptionDictionary() : m_parent(0) {}
//! \brief Constructor taking a parent context.
OptionDictionary(OptionContext * parent) : m_parent(parent) {}
//! \brief Destructor.
~OptionDictionary();
//! \name Parents
//@{
//! \brief Returns the current parent context.
//! \return The current parent context instance.
//! \retval NULL No parent has been set.
inline OptionContext * getParent() const { return m_parent; }
//! \brief Change the parent context.
//! \param newParent The parent context object. May be NULL, in which case
//! the object will no longer have a parent context.
inline void setParent(OptionContext * newParent) { m_parent = newParent; }
//@}
//! \name Options
//@{
//! \brief Detemine whether the named option is present in the table.
virtual bool hasOption(const std::string & name) const;
//! \brief Returns the option's value.
virtual const Value * getOption(const std::string & name) const;
//! \brief Adds or changes an option's value.
virtual void setOption(const std::string & name, Value * value);
//! \brief Removes an option from the table.
virtual void deleteOption(const std::string & name);
//@}
//! \name Locking
//@{
//! \brief Returns true if the specified option is locked from further changes.
bool isOptionLocked(const std::string & name) const;
//! \brief Prevent further modifications of an option's value.
void lockOption(const std::string & name);
//! \brief Allow an option to be changed.
void unlockOption(const std::string & name);
//@}
//! \name Operators
//@{
//! \brief Indexing operator; returns the value for the option \a name.
const Value * operator [] (const std::string & name) const;
//@}
protected:
OptionContext * m_parent; //!< Our parent context.
/*!
* \brief Information about one option's value.
*/
struct OptionValue
{
Value * m_value; //!< The object for this option's value.
bool m_isLocked; //!< True if this value is locked from further changes.
//! \brief Constructor.
OptionValue() : m_value(0), m_isLocked(false) {}
};
typedef std::map<std::string, OptionValue> option_map_t; //!< Map from option name to value.
option_map_t m_options; //!< The option dictionary.
};
}; // namespace elftosb
#endif // _OptionDictionary_h_
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