State.h

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00001 //# State.h: global display state
00002 //# Copyright (C) 2009
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 
00027 #ifndef CASA_DISPLAY_STATE_H_
00028 #define CASA_DISPLAY_STATE_H_
00029 
00030 namespace casa { //# NAMESPACE CASA - BEGIN
00031 
00032         namespace display { //# NAMESPACE DISPLAY - BEGIN
00033                 class state {
00034                         friend class stateCleanup;
00035                 public:
00036 
00037                         static state &instance( ) {
00038                                 return initialized == false ? startup( ) : *singleton;
00039                         }
00040 
00041                         // allows classes (primarily in the redisplay chain) to tell if we
00042                         // are currently outputing to a file...
00043                         bool fileOutputMode( );
00044                         // begin file output
00045                         void beginFileOutputMode( );
00046                         // end file output
00047                         void endFileOutputMode( );
00048 
00049                 private:
00050 
00051                         static state *singleton;
00052 
00053                         state( ) : file_output_mode_count_(0) { }
00054                         ~state( ) { }
00055 
00056                         static state &startup( );
00057                         static void shutdown( );
00058 
00059                         int file_output_mode_count_;
00060                         static bool initialized;
00061 
00062                 };
00063 
00064                 static class stateCleanup {
00065                 public:
00066                         stateCleanup( ) {
00067                                 creation_count += 1;
00068                         }
00069                         ~stateCleanup( ) {
00070                                 if ( --creation_count == 0 ) {
00071                                         state::shutdown( );
00072                                 }
00073                         }
00074                 private:
00075                         static unsigned int creation_count;
00076                 } local_state_cleanup_object;
00077         }
00078 
00079 }
00080 
00081 #endif
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