RSFileReaderWriter.h

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//# RSFileReaderWriter.h: Interfaces for classes that read/write shape files.
//# Copyright (C) 2008
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#ifndef RSFILEREADERWRITER_H_
#define RSFILEREADERWRITER_H_

#include <display/RegionShapes/RegionShape.h>
#include <casa/Containers/Record.h>
#include <display/Display/PanelDisplay.h>
#include <display/Display/DisplayCoordinateSystem.h>

#include <utility>

#include <casa/namespace.h>
using namespace std;

class QWidget;

namespace casa {

        class RSFileReader;
        class RSFileWriter;

// Convenience class for a String/bool pair.
        class RFError {
        public:
                // Constructor, blank error.
                RFError();

                // Constructor, error with the given text and isFatal flag.
                RFError(const String& error, bool isFatal = false);

                // Destructor.
                ~RFError();


                // Returns whether this error was fatal or not.
                bool isFatal() const;

                // Returns this error's text.
                const String& error() const;

                // Sets the error.
                void set(const String& error, bool isFatal = false);

        private:
                String m_error;
                bool m_fatal;
        };


// Superclass for readers and writers containing common definitions and
// operations.
        class RSFileReaderWriter {
        public:
                // Public Static Methods //

                // An enum of all known subclasses/formats supported.
                enum SupportedType {
                    DS9, CASA_XML
                };

                // Converts between enum and String for SupportedType.
                // <group>
                static SupportedType supportedType(String type);
                static String supportedType(SupportedType type);
                // </group>

                // Returns the file extension for the given SupportedType.
                static String extensionForType(SupportedType type);

                // Returns all known SupportedTypes.
                // <group>
                static vector<SupportedType> supportedTypes();
                static vector<String> supportedTypesStrings();
                // </group>

                // Returns an appropriate child RegionFileReader class for the given
                // SupportedType, or NULL for an error (shouldn't happen).
                static RSFileReader* readerForType(SupportedType type);

                // Returns an new appropriate child RegionFileWriter class for the given
                // SupportedType, or NULL for an error (shouldn't happen).
                static RSFileWriter* writerForType(SupportedType type);

                // Returns an new appropriate options widget for the given SupportedType,
                // or NULL for an error (shouldn't happen).
                static QWidget* optionsWidgetForType(SupportedType type);


                // Non-Static Members //

                // Constructor.
                RSFileReaderWriter() { }

                // Destructor.
                virtual ~RSFileReaderWriter() { }

                // Sets the file to be read/written to the given.
                virtual void setFile(const String& filename);

                // Returns the last error set during read/write.
                virtual const RFError& lastError() const;

        protected:
                // Filename to be read/written.
                String m_filename;

                // Last error seen during read/write.
                RFError m_lastError;

                // Convenience method for setting last error during read/write.
                virtual void setError(const String& error, bool isFatal = false) const;
        };


// Abstract superclass for any class that reads a format that produces
// RegionShapes from a file.
        class RSFileReader : public virtual RSFileReaderWriter {
        public:
                // Constructor.
                RSFileReader() { }

                // Destructor.
                virtual ~RSFileReader() { }

                // Read the filename set with setFile and returns true if no errors were
                // reported, false otherwise.  If false is returned, the details can be
                // found using lastError().  Any valid RegionShapes that were read from the
                // file are placed in the given vector (which is cleared first).
                virtual bool read(vector<RegionShape*>& readShapes) = 0;

                // Calls setFile() then read().
                virtual bool readFile(const String& file, vector<RegionShape*>& shapes) {
                        setFile(file);
                        return read(shapes);
                }
        };


// Abstract superclass for any class that writes RegionShapes to a region
// file format.
        class RSFileWriter : public virtual RSFileReaderWriter {
        public:
                // Constructor.
                RSFileWriter() { }

                // Destructor.
                virtual ~RSFileWriter() { }

                // Provides a custom widget that can be used to get/set options specific
                // to each format type.
                virtual QWidget* optionsWidget() const = 0;

                // Sets the options to the values given in the widget.  May ignore invalid
                // widgets (i.e., widgets different from the kind provided by
                // optionsWidget()).
                virtual void setOptions(const QWidget* widget) = 0;

                // Write the given regions to the filename set with setFile and returns
                // true if no errors were reported, false otherwise.  If false is returned,
                // the details can be found using lastError().
                virtual bool write(const vector<RegionShape*>& shapes) const = 0;

                // Calls setFile then write.
                virtual bool writeFile(const String& filename,
                                       const vector<RegionShape*>& shapes) {
                        setFile(filename);
                        return write(shapes);
                }
        };

}

#endif /*RSFILEREADERWRITER_H_*/