//
// XMLConfiguration.h
//
// $Id: //poco/Main/Util/include/Util/XMLConfiguration.h#1 $
//
// Definition of the XMLConfiguration class.
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Util_XMLConfiguration_INCLUDED
#define Util_XMLConfiguration_INCLUDED


#ifndef Util_Util_INCLUDED
#include "Util/Util.h"
#endif
#ifndef Util_MapConfiguration_INCLUDED
#include "Util/MapConfiguration.h"
#endif
#ifndef DOM_Document_INCLUDED
#include "DOM/Document.h"
#endif
#ifndef DOM_AutoPtr_INCLUDED
#include "DOM/AutoPtr.h"
#endif
#ifndef SAX_InputSource_INCLUDED
#include "SAX/InputSource.h"
#endif
#ifndef STD_ISTREAM_INCLUDED
#include <istream>
#define STD_ISTREAM_INCLUDED
#endif


Util_BEGIN


class Util_API XMLConfiguration: public AbstractConfiguration
	/// This configuration class extracts configuration properties
	/// from an XML document. An XPath-like syntax for property
	/// names is supported to allow full access to the XML document.
	/// XML namespaces are not supported. The name of the root element
	/// of an XML document is not significant. Periods in tag names
	/// are not supported.
	/// 
	/// Given the following XML document as an example:
	///
	///     <config>
	///         <prop1>value1</prop1>
	///         <prop2>value2</prop2>
	///         <prop3>
	///            <prop4 attr="value3"/>
	///            <prop4 attr="value4"/>
	///         </prop3>
	///         <prop5>value5</prop5>
	///         <prop5>value6</prop5>
	///     </config>
	///
	/// The following property names would be valid and would
	/// yield the shown values:
	///
	///     prop1                 -> value1
	///     prop2                 -> value2
	///     prop3.prop4           -> (empty string)
	///     prop3.prop4[@attr]    -> value3
	///     prop3.prop4[1][@attr] -> value4
	///     prop5[0]              -> value5
	///     prop5[1]              -> value6
	///
	/// Enumerating attributes is not supported.
	/// Calling keys("prop3.prop4") will return an empty range. 
	///
	/// Setting properties is not supported. An attempt to set a property results
	/// in a NotImplementedException being thrown.
{
public:
	XMLConfiguration();
		/// Creates an empty XMLConfiguration.

	XMLConfiguration(XML::InputSource* pInputSource);
		/// Creates an XMLConfiguration and loads the XML document from
		/// the given InputSource.

	XMLConfiguration(std::istream& istr);
		/// Creates an XMLConfiguration and loads the XML document from
		/// the given stream.

	XMLConfiguration(const std::string& path);
		/// Creates an XMLConfiguration and loads the XML document from
		/// the given path.

	XMLConfiguration(const XML::Document* pDocument);
		/// Creates the XMLConfiguration using the given XML document.
		
	XMLConfiguration(const XML::Node* pNode);
		/// Creates the XMLConfiguration using the given XML node.

	void load(XML::InputSource* pInputSource);
		/// Loads the XML document containing the configuration data
		/// from the given InputSource.

	void load(std::istream& istr);
		/// Loads the XML document containing the configuration data
		/// from the given stream.
		
	void load(const std::string& path);
		/// Loads the XML document containing the configuration data
		/// from the given file.
		
	void load(const XML::Document* pDocument);
		/// Loads the XML document containing the configuration data
		/// from the given XML document.

	void load(const XML::Node* pNode);
		/// Loads the XML document containing the configuration data
		/// from the given XML node.

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;
	~XMLConfiguration();

private:
	const XML::Node* findNode(const std::string& key) const;
	static const XML::Node* findNode(std::string::const_iterator& it, const std::string::const_iterator& end, const XML::Node* pNode);
	static const XML::Node* findElement(const std::string& name, const XML::Node* pNode);
	static const XML::Node* findElement(int index, const XML::Node* pNode);
	static const XML::Node* findAttribute(const std::string& name, const XML::Node* pNode);

	XML::AutoPtr<XML::Node>     _pRoot;
	XML::AutoPtr<XML::Document> _pDocument;
};


Util_END


#endif // Util_XMLConfiguration_INCLUDED