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// ConfigurationMapper.h
//
// Library: Util
// Package: Configuration
// Module: ConfigurationMapper
//
// Definition of the ConfigurationMapper class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Util_ConfigurationMapper_INCLUDED
#define Util_ConfigurationMapper_INCLUDED
#include "Poco/Util/Util.h"
#include "Poco/Util/AbstractConfiguration.h"
namespace Poco {
namespace Util {
class Util_API ConfigurationMapper: public AbstractConfiguration
/// This configuration maps a property hierarchy into another
/// hierarchy.
///
/// For example, given a configuration with the following properties:
/// config.value1
/// config.value2
/// config.sub.value1
/// config.sub.value2
/// and a ConfigurationView with fromPrefix == "config" and toPrefix == "root.conf", then
/// the above properties will be available via the mapper as
/// root.conf.value1
/// root.conf.value2
/// root.conf.sub.value1
/// root.conf.sub.value2
///
/// FromPrefix can be empty, in which case, and given toPrefix == "root",
/// the properties will be available as
/// root.config.value1
/// root.config.value2
/// root.config.sub.value1
/// root.config.sub.value2
///
/// This is equivalent to the functionality of the ConfigurationView class.
///
/// Similarly, toPrefix can also be empty. Given fromPrefix == "config" and
/// toPrefix == "", the properties will be available as
/// value1
/// value2
/// sub.value1
/// sub.value2
///
/// If both fromPrefix and toPrefix are empty, no mapping is performed.
///
/// A ConfigurationMapper is most useful in combination with a
/// LayeredConfiguration.
{
public:
ConfigurationMapper(const std::string& fromPrefix, const std::string& toPrefix, AbstractConfiguration* pConfig);
/// Creates the ConfigurationMapper. The ConfigurationMapper does not take
/// ownership of the passed configuration.
protected:
bool getRaw(const std::string& key, std::string& value) const;
void setRaw(const std::string& key, const std::string& value);
void enumerate(const std::string& key, Keys& range) const;
void removeRaw(const std::string& key);
std::string translateKey(const std::string& key) const;
~ConfigurationMapper();
private:
ConfigurationMapper(const ConfigurationMapper&);
ConfigurationMapper& operator = (const ConfigurationMapper&);
std::string _fromPrefix;
std::string _toPrefix;
AbstractConfiguration* _pConfig;
};
} } // namespace Poco::Util
#endif // Util_ConfigurationMapper_INCLUDED
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