//
// LayeredConfiguration.cpp
//
// $Id: //poco/1.2/Util/src/LayeredConfiguration.cpp#1 $
//
// Library: Util
// Package: Configuration
// Module:  LayeredConfiguration
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Util/LayeredConfiguration.h"
#include "Poco/Exception.h"
#include <set>


using Poco::AutoPtr;
using Poco::RuntimeException;


namespace Poco {
namespace Util {


LayeredConfiguration::LayeredConfiguration()
{
}


LayeredConfiguration::~LayeredConfiguration()
{
}


void LayeredConfiguration::add(AbstractConfiguration* pConfig)
{
	add(pConfig, true);
}


void LayeredConfiguration::add(AbstractConfiguration* pConfig, bool shared)
{
	poco_check_ptr (pConfig);

	_configs.push_back(ConfigPtr(pConfig, shared));
}


void LayeredConfiguration::addFront(AbstractConfiguration* pConfig)
{
	addFront(pConfig, true);
}


void LayeredConfiguration::addFront(AbstractConfiguration* pConfig, bool shared)
{
	poco_check_ptr (pConfig);

	_configs.insert(_configs.begin(), ConfigPtr(pConfig, shared));
}


bool LayeredConfiguration::getRaw(const std::string& key, std::string& value) const
{
	for (ConfigVec::const_iterator it = _configs.begin(); it != _configs.end(); ++it)
	{
		if ((*it)->getRaw(key, value))
			return true;
	}
	return false;
}


void LayeredConfiguration::setRaw(const std::string& key, const std::string& value)
{
	if (!_configs.empty())
		_configs.back()->setRaw(key, value);
	else
		throw RuntimeException("No configuration object to store the property", key);
}


void LayeredConfiguration::enumerate(const std::string& key, Keys& range) const
{
	std::set<std::string> keys;
	for (ConfigVec::const_iterator itc = _configs.begin(); itc != _configs.end(); ++itc)
	{
		Keys partRange;
		(*itc)->enumerate(key, partRange);
		for (Keys::const_iterator itr = partRange.begin(); itr != partRange.end(); ++itr)
		{
			if (keys.find(*itr) == keys.end())
			{
				range.push_back(*itr);
				keys.insert(*itr);
			}
		}
	}
}


} } // namespace Poco::Util