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FormattingChannel.h

//
// FormattingChannel.h
//
// $Id: //poco/1.2/Foundation/include/Poco/FormattingChannel.h#2 $
//
// Library: Foundation
// Package: Logging
// Module:  Formatter
//
// Definition of the FormattingChannel class.
//
// 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.
//


#ifndef Foundation_FormattingChannel_INCLUDED
#define Foundation_FormattingChannel_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Channel.h"


namespace Poco {


class Formatter;


00053 class Foundation_API FormattingChannel: public Channel
      /// The FormattingChannel is a filter channel that routes
      /// a Message through a Formatter before passing it on
      /// to the destination channel.
{
public:
      FormattingChannel();
            /// Creates a FormattingChannel.
            
      FormattingChannel(Formatter* pFormatter);
            /// Creates a FormattingChannel and attaches a Formatter.
            
      FormattingChannel(Formatter* pFormatter, Channel* pChannel);
            /// Creates a FormattingChannel and attaches a Formatter
            /// and a Channel.
            
      void setFormatter(Formatter* pFormatter);
            /// Sets the Formatter used to format the messages
            /// before they are passed on. If null, the message
            /// is passed on unmodified.
            
      Formatter* getFormatter() const;
            /// Returns the Formatter used to format messages,
            /// which may be null.

      void setChannel(Channel* pChannel);
            /// Sets the destination channel to which the formatted 
            /// messages are passed on.
            
      Channel* getChannel() const;
            /// Returns the channel to which the formatted
            /// messages are passed on.
            
      void log(const Message& msg);
            /// Formats the given Message using the Formatter and
            /// passes the formatted message on to the destination
            /// Channel.

      void setProperty(const std::string& name, const std::string& value);
            /// Sets or changes a configuration property.
            ///
            /// Only the "channel" and "formatter" properties are supported, which allow
            /// setting the target channel and formatter, respectively, via the LoggingRegistry.
            /// The "channel" and "formatter" properties are set-only.
            ///
            /// Unsupported properties are passed to the attached Channel.

      void open();
            /// Opens the attached channel.
            
      void close();
            /// Closes the attached channel.

protected:
      ~FormattingChannel();

private:
      Formatter* _pFormatter;
      Channel* _pChannel;
};


} // namespace Poco


#endif // Foundation_FormattingChannel_INCLUDED

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