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86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
//
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// ConfigurationView.h
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//
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// Library: Util
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// Package: Configuration
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// Module: ConfigurationView
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//
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// Definition of the ConfigurationView class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Util_ConfigurationView_INCLUDED
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#define Util_ConfigurationView_INCLUDED
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#include "Poco/Util/AbstractConfiguration.h"
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#include "Poco/Util/Util.h"
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namespace Poco
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{
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namespace Util
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{
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class Util_API ConfigurationView : public AbstractConfiguration
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/// This configuration implements a "view" into a sub-hierarchy
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/// of another configuration.
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///
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/// For example, given a configuration with the following properties:
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/// config.value1
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/// config.value2
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/// config.sub.value1
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/// config.sub.value2
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/// and a ConfigurationView with the prefix "config", then
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/// the above properties will be available via the view as
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/// value1
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/// value2
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/// sub.value1
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/// sub.value2
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///
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/// A ConfigurationView is most useful in combination with a
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/// LayeredConfiguration.
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///
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/// If a property is not found in the view, it is searched in
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/// the original configuration. Given the above example configuration,
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/// the property named "config.value1" will still be found in the view.
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///
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/// The main reason for this is that placeholder expansion (${property})
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/// still works as expected given a ConfigurationView.
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{
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public:
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ConfigurationView(const std::string & prefix, AbstractConfiguration * pConfig);
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/// Creates the ConfigurationView. The ConfigurationView does not take
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/// ownership of the passed configuration.
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protected:
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bool getRaw(const std::string & key, std::string & value) const;
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void setRaw(const std::string & key, const std::string & value);
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void enumerate(const std::string & key, Keys & range) const;
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void removeRaw(const std::string & key);
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std::string translateKey(const std::string & key) const;
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~ConfigurationView();
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private:
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ConfigurationView(const ConfigurationView &);
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ConfigurationView & operator=(const ConfigurationView &);
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std::string _prefix;
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AbstractConfiguration * _pConfig;
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};
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}
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} // namespace Poco::Util
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#endif // Util_ConfigurationView_INCLUDED
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