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82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
// $Id: InputFileStream.h 2939 2010-02-24 11:15:44Z jfouet $
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/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2006 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#pragma once
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#include <cstdlib>
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#include <fstream>
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#include <string>
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#include <iostream>
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#include <boost/iostreams/filtering_stream.hpp>
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namespace Moses
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{
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/** Version of std::ostream with transparent compression.
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*
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* Transparently compresses output when writing to a file whose name ends in
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* ".gz". Or, writes to stdout instead of a file when given a filename
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* consisting of just a dash ("-").
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*/
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class OutputFileStream : public boost::iostreams::filtering_ostream
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{
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private:
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/** File that needs flushing & closing when we close this stream.
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*
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* Is NULL when no file is opened, e.g. when writing to standard output.
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*/
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std::ofstream *m_outFile;
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/// Is this stream open?
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bool m_open;
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public:
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/** Create an unopened OutputFileStream.
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*
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* Until it's been opened, nothing can be done with this stream.
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*/
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OutputFileStream();
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/// Create an OutputFileStream, and open it by calling Open().
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OutputFileStream(const std::string &filePath);
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virtual ~OutputFileStream();
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// TODO: Can we please just always throw an exception when this fails?
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/** Open stream.
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*
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* If filePath is "-" (just a dash), this opens the stream for writing to
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* standard output. Otherwise, it opens the given file. If the filename
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* has the ".gz" suffix, output will be transparently compressed.
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*
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* Call Close() to close the file.
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*
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* Returns whether opening the file was successful. It may also throw an
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* exception on failure.
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*/
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bool Open(const std::string &filePath);
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/// Flush and close stream. After this, the stream can be opened again.
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void Close();
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};
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}
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