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104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
//
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// ConfigurationView.h
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//
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// $Id: //poco/svn/Util/include/Poco/Util/ConfigurationView.h#1 $
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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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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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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/Util.h"
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#include "Poco/Util/AbstractConfiguration.h"
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namespace Poco {
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namespace Util {
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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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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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} } // namespace Poco::Util
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#endif // Util_ConfigurationView_INCLUDED
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