lily/context-handle.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "context-handle.hh"
  21 #include "context.hh"
  22
  23 Context_handle::Context_handle ()
  24 {
  25   outlet_ = 0;
  26 }
  27
  28 Context_handle::Context_handle (Context_handle const &s)
  29 {
  30   outlet_ = 0;
  31   if (s.outlet_)
  32     up (s.outlet_);
  33 }
  34
  35 Context_handle::~Context_handle ()
  36 {
  37   /*
  38     Don't do
  39
  40     if (outlet_)
  41     down ();
  42
  43     with GC, this is asynchronous.
  44   */
  45 }
  46
  47 void
  48 Context_handle::up (Context *t)
  49 {
  50   outlet_ = t;
  51   t->iterator_count_++;
  52 }
  53
  54 void
  55 Context_handle::down ()
  56 {
  57   outlet_->iterator_count_--;
  58   outlet_ = 0;
  59 }
  60
  61 void
  62 Context_handle::operator = (Context_handle const &s)
  63 {
  64   set_context (s.outlet_);
  65 }
  66
  67 void
  68 Context_handle::set_context (Context *trans)
  69 {
  70   if (outlet_ == trans)
  71     return;
  72   if (outlet_)
  73     down ();
  74   if (trans)
  75     up (trans);
  76 }
  77
  78 Context *
  79 Context_handle::get_outlet () const
  80 {
  81
  82   return outlet_;
  83 }
  84
  85 int
  86 Context_handle::get_count () const
  87 {
  88   return outlet_->iterator_count_;
  89 }