source: XMLIO_V2/external/src/POCO/Foundation/ArchiveStrategy.cpp @ 80

//
// ArchiveStrategy.cpp
//
// $Id: //poco/1.3/Foundation/src/ArchiveStrategy.cpp#4 $
//
// Library: Foundation
// Package: Logging
// Module:  FileChannel
//
// 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/ArchiveStrategy.h>
#include <Poco/NumberFormatter.h>
#include <Poco/File.h>
#include <Poco/Path.h>
#include <Poco/DeflatingStream.h>
#include <Poco/StreamCopier.h>
#include <Poco/Exception.h>
#include <Poco/ActiveDispatcher.h>
#include <Poco/ActiveMethod.h>
#include <Poco/Void.h>
#include <Poco/FileStream.h>


namespace Poco {


//
// ArchiveCompressor
//


class ArchiveCompressor: public ActiveDispatcher
{
public:
        ArchiveCompressor():
                compress(this, &ArchiveCompressor::compressImpl)
        {
        }
        
        ~ArchiveCompressor()
        {
        }
        
        ActiveMethod<Void, std::string, ArchiveCompressor, ActiveStarter<ActiveDispatcher> > compress;

protected:
        Void compressImpl(const std::string& path)
        {
                std::string gzPath(path);
                gzPath.append(".gz");
                FileInputStream istr(path, std::ios::binary | std::ios::in);
                if (!istr.good()) throw OpenFileException(path);
                FileOutputStream ostr(gzPath, std::ios::binary | std::ios::out);
                if (ostr.good())
                {
                        DeflatingOutputStream deflater(ostr, DeflatingStreamBuf::STREAM_GZIP);
                        StreamCopier::copyStream(istr, deflater);
                        deflater.close();
                        ostr.close();
                        istr.close();
                        File f(path);
                        f.remove();
                }
                else throw CreateFileException(gzPath);
                return Void();
        }
};


//
// ArchiveStrategy
//


ArchiveStrategy::ArchiveStrategy(): 
        _compress(false),
        _pCompressor(0)
{
}


ArchiveStrategy::~ArchiveStrategy()
{
        delete _pCompressor;
}


void ArchiveStrategy::compress(bool flag)
{
        _compress = flag;
}


void ArchiveStrategy::moveFile(const std::string& oldPath, const std::string& newPath)
{
        bool compressed = false;
        Path p(oldPath);
        File f(oldPath);
        if (!f.exists())
        {
                f = oldPath + ".gz";
                compressed = true;
        }
        std::string mvPath(newPath);
        if (_compress || compressed)
                mvPath.append(".gz");
        if (!_compress || compressed)
        {
                f.renameTo(mvPath);
        }
        else
        {
                f.renameTo(newPath);
                if (!_pCompressor) _pCompressor = new ArchiveCompressor;
                _pCompressor->compress(newPath);
        }
}


bool ArchiveStrategy::exists(const std::string& name)
{
        File f(name);
        if (f.exists())
        {
                return true;
        }
        else if (_compress)
        {
                std::string gzName(name);
                gzName.append(".gz");
                File gzf(gzName);
                return gzf.exists();
        }
        else return false;
}


//
// ArchiveByNumberStrategy
//


ArchiveByNumberStrategy::ArchiveByNumberStrategy()
{
}


ArchiveByNumberStrategy::~ArchiveByNumberStrategy()
{
}


LogFile* ArchiveByNumberStrategy::archive(LogFile* pFile)
{
        std::string basePath = pFile->path();
        delete pFile;
        int n = -1;
        std::string path;
        do
        {
                path = basePath;
                path.append(".");
                NumberFormatter::append(path, ++n);
        }
        while (exists(path));
        
        while (n >= 0)
        {
                std::string oldPath = basePath;
                if (n > 0)
                {
                        oldPath.append(".");
                        NumberFormatter::append(oldPath, n - 1);
                }
                std::string newPath = basePath;
                newPath.append(".");
                NumberFormatter::append(newPath, n);
                moveFile(oldPath, newPath);
                --n;
        }
        return new LogFile(basePath);
}


} // namespace Poco