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// 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.
#ifndef UI_BASE_X_X11_ATOM_CACHE_H_
#define UI_BASE_X_X11_ATOM_CACHE_H_
#include "base/basictypes.h"
#include "ui/base/ui_export.h"
#include <X11/Xlib.h>
#include <map>
#include <string>
// Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
#undef RootWindow
namespace ui {
// Pre-caches all Atoms on first use to minimize roundtrips to the X11
// server. By default, GetAtom() will CHECK() that atoms accessed through
// GetAtom() were passed to the constructor, but this behaviour can be changed
// with allow_uncached_atoms().
class UI_EXPORT X11AtomCache {
public:
// Preinterns the NULL terminated list of string |to_cache_ on |xdisplay|.
X11AtomCache(Display* xdisplay, const char** to_cache);
~X11AtomCache();
// Returns the pre-interned Atom without having to go to the x server.
::Atom GetAtom(const char*) const;
// When an Atom isn't in the list of items we've cached, we should look it
// up, cache it locally, and then return the result.
void allow_uncached_atoms() { uncached_atoms_allowed_ = true; }
private:
Display* xdisplay_;
bool uncached_atoms_allowed_;
mutable std::map<std::string, ::Atom> cached_atoms_;
DISALLOW_COPY_AND_ASSIGN(X11AtomCache);
};
} // namespace ui
#endif // UI_BASE_X_X11_ATOM_CACHE_H_
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