text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "ui/base/x/x11_atom_cache.h"
  
  #include <X11/Xatom.h>
  
  #include "base/message_pump_aurax11.h"
  #include "base/memory/scoped_ptr.h"
  
  namespace ui {
  
  X11AtomCache::X11AtomCache(Display* xdisplay, const char** to_cache)
      : xdisplay_(xdisplay),
        uncached_atoms_allowed_(false) {
    int cache_count = 0;
    for (const char** i = to_cache; *i != NULL; i++)
      cache_count++;
  
    scoped_ptr< ::Atom[]> cached_atoms(new ::Atom[cache_count]);
  
    // Grab all the atoms we need now to minimize roundtrips to the X11 server.
    XInternAtoms(xdisplay_,
                 const_cast<char**>(to_cache), cache_count, False,
                 cached_atoms.get());
  
    for (int i = 0; i < cache_count; ++i)
      cached_atoms_.insert(std::make_pair(to_cache[i], cached_atoms[i]));
  }
  
  X11AtomCache::~X11AtomCache() {}
  
  ::Atom X11AtomCache::GetAtom(const char* name) const {
    std::map<std::string, ::Atom>::const_iterator it = cached_atoms_.find(name);
  
    if (uncached_atoms_allowed_ && it == cached_atoms_.end()) {
      ::Atom atom = XInternAtom(xdisplay_, name, false);
      cached_atoms_.insert(std::make_pair(name, atom));
      return atom;
    }
  
    CHECK(it != cached_atoms_.end()) << " Atom " << name << " not found";
    return it->second;
  }
  
  }  // namespace ui
  