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

//
// TemporaryFile.cpp
//
// $Id: //poco/1.3/Foundation/src/TemporaryFile.cpp#2 $
//
// Library: Foundation
// Package: Filesystem
// Module:  TemporaryFile
//
// 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/TemporaryFile.h>
#include <Poco/Path.h>
#include <Poco/Exception.h>
#include <Poco/Process.h>
#include <Poco/Mutex.h>
#include <set>
#include <sstream>


namespace Poco {


class TempFileCollector
{
public:
        TempFileCollector()
        {
        }
        
        ~TempFileCollector()
        {
                for (std::set<std::string>::iterator it = _files.begin(); it != _files.end(); ++it)
                {
                        try
                        {
                                File f(*it);
                                f.remove(true);
                        }
                        catch (Exception&)
                        {
                        }
                }
        }
        
        void registerFile(const std::string& path)
        {
                FastMutex::ScopedLock lock(_mutex);

                Path p(path);
                _files.insert(p.absolute().toString());
        }
        
private:
        std::set<std::string> _files;
        FastMutex             _mutex;
};


TemporaryFile::TemporaryFile(): File(tempName()), _keep(false)
{
}


TemporaryFile::~TemporaryFile()
{
        if (!_keep)
        {
                try
                {
                        if (exists())
                                remove(true);
                }
                catch (Exception&)
                {
                }
        }
}


void TemporaryFile::keep()
{
        _keep = true;
}

        
void TemporaryFile::keepUntilExit()
{
        _keep = true;
        registerForDeletion(path());
}


void TemporaryFile::registerForDeletion(const std::string& path)
{
        static TempFileCollector fc;
        fc.registerFile(path);
}


std::string TemporaryFile::tempName()
{
        std::ostringstream name;
        static FastMutex mutex;
        static unsigned long count = 0;
        mutex.lock();
        unsigned long n = count++;
        mutex.unlock();
        name << Path::temp();
        name << "tmp" << Process::id();
        for (int i = 0; i < 6; ++i)
        {
                name << char('a' + (n % 26));
                n /= 26;
        }
        return name.str();
}


} // namespace Poco