//
// PropertyFileConfiguration.h
//
// $Id: //poco/Main/Util/include/Util/PropertyFileConfiguration.h#1 $
//
// Definition of the PropertyFileConfiguration 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
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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//


#ifndef Util_PropertyFileConfiguration_INCLUDED
#define Util_PropertyFileConfiguration_INCLUDED


#ifndef Util_Util_INCLUDED
#include "Util/Util.h"
#endif
#ifndef Util_MapConfiguration_INCLUDED
#include "Util/MapConfiguration.h"
#endif
#ifndef STD_ISTREAM_INCLUDED
#include <istream>
#define STD_ISTREAM_INCLUDED
#endif
#ifndef STD_OSTREAM_INCLUDED
#include <ostream>
#define STD_OSTREAM_INCLUDED
#endif


Util_BEGIN


class Util_API PropertyFileConfiguration: public MapConfiguration
	/// This implementation of a Configuration reads properties
	/// from a Java-style properties file.
	///
	/// The file syntax is implemented as follows.
	///   - a line starting with a hash '#' or exclamation mark '!' is treated as a comment and ignored
	///   - every other line denotes a property assignment in the form
	///     <key> = <value> or
	///     <key> : <value>
	///
	/// Keys and values may contain special characters represented by the following escape sequences:
	///   - \t: tab (0x09)
	///   - \n: line feed (0x0a)
	///   - \r: carriage return (0x0d)
	///   - \f: form feed (0x0c)
	///
	/// For every other sequence that starts with a backslash, the backslash is removed.
	/// Therefore, the sequence \a would just yield an 'a'.
	///
	/// A value can spread across multiple lines if the last character in a line (the character
	/// immediately before the carriage return or line feed character) is a single backslash.
	///
	/// Property names are case sensitive. Leading and trailing whitespace is
	/// removed from both keys and values. A property name can neither contain
	/// a colon ':' nor an equal sign '=' character.
{
public:
	PropertyFileConfiguration();
		/// Creates an empty PropertyFileConfiguration.

	PropertyFileConfiguration(std::istream& istr);
		/// Creates an PropertyFileConfiguration and loads the configuration data
		/// from the given stream, which must be in properties file format.
		
	PropertyFileConfiguration(const std::string& path);
		/// Creates an PropertyFileConfiguration and loads the configuration data
		/// from the given file, which must be in properties file format.
		
	void load(std::istream& istr);
		/// Loads the configuration data from the given stream, which 
		/// must be in properties file format.
		
	void load(const std::string& path);
		/// Loads the configuration data from the given file, which 
		/// must be in properties file format.
		
	void save(std::ostream& ostr) const;
		/// Writes the configuration data to the given stream.
		///
		/// The data is written as a sequence of statements in the form
		/// <key>: <value>
		/// separated by a newline character.

	void save(const std::string& path) const;
		/// Writes the configuration data to the given file.

protected:
	~PropertyFileConfiguration();
	
private:
	void parseLine(std::istream& istr);
	static int readChar(std::istream& istr);
};


Util_END


#endif // Util_PropertyFileConfiguration_INCLUDED