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// PropertyFileConfiguration.h
//
// Library: Util
// Package: Configuration
// Module: PropertyFileConfiguration
//
// Definition of the PropertyFileConfiguration class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Util_PropertyFileConfiguration_INCLUDED
#define Util_PropertyFileConfiguration_INCLUDED
#include "Poco/Util/Util.h"
#include "Poco/Util/MapConfiguration.h"
#include <istream>
#include <ostream>
namespace Poco {
namespace Util {
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);
};
} } // namespace Poco::Util
#endif // Util_PropertyFileConfiguration_INCLUDED
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