Introduce IBusBridge for ibus-less implementation.

chromeos/ime/ibus_bridge.h

+// 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 CHROMEOS_IME_IBUS_BRIDGE_H_
+#define CHROMEOS_IME_IBUS_BRIDGE_H_
+
+#include <string>
+#include "base/basictypes.h"
+#include "base/memory/singleton.h"
+
+namespace chromeos {
+class IBusInputContextHandlerInterface;
+class IBusEngineHandlerInterface;
+
+namespace ibus {
+class IBusPanelCandidateWindowHandlerInterface;
+class IBusPanelPropertyHandlerInterface;
+}  // namespace ibus
+
+// IBusBridge provides access of each IME related handler. This class is used
+// for IME implementation without ibus-daemon. The legacy ibus IME communicates
+// their engine with dbus protocol, but new implementation doesn't. Instead of
+// dbus communcation, new implementation calls target service(e.g. PanelService
+// or EngineService) directly by using this class. IBusBridge is managed as
+// singleton object.
+class IBusBridge {
+ public:
+  // Returns IBusBridge instance.
+  static IBusBridge* GetInstance();
+
+  // Returns current InputContextHandler. This function returns NULL if input
+  // context is not ready to use.
+  IBusInputContextHandlerInterface* input_context_handler() const {
+    return input_context_handler_;
+  }
+
+  // Updates current InputContextHandler. If there is no active input context,
+  // pass NULL for |handler|. Caller must release |handler|.
+  void set_input_context_handler(IBusInputContextHandlerInterface* handler) {
+    input_context_handler_ = handler;
+  }
+
+  // Returns current EngineHandler. This function returns NULL if current engine
+  // is not ready to use.
+  IBusEngineHandlerInterface* engine_handler() const {
+    return engine_handler_;
+  }
+
+  // Updates current EngineHandler. If there is no active engine service, pass
+  // NULL for |handler|. Caller must release |handler|.
+  void set_engine_handler(IBusEngineHandlerInterface* handler) {
+    engine_handler_ = handler;
+  }
+
+  // Returns current CandidateWindowHandler. This function returns NULL if
+  // current candidate window is not ready to use.
+  ibus::IBusPanelCandidateWindowHandlerInterface*
+      candidate_window_handler() const {
+    return candidate_window_handler_;
+  }
+
+  // Updates current CandidatWindowHandler. If there is no active candidate
+  // window service, pass NULL for |handler|. Caller must release |handler|.
+  void set_candidate_window_handler(
+      ibus::IBusPanelCandidateWindowHandlerInterface* handler) {
+    candidate_window_handler_ = handler;
+  }
+
+  // Returns current PropertyHandler. This function returns NULL if panel window
+  // is not ready to use.
+  ibus::IBusPanelPropertyHandlerInterface* panel_handler() const {
+    return panel_handler_;
+  }
+
+  // Updates current PropertyHandler. If there is no active property service,
+  // pass NULL for |handler|. Caller must release |handler|.
+  void set_panel_handler(ibus::IBusPanelPropertyHandlerInterface* handler) {
+    panel_handler_ = handler;
+  }
+
+ private:
+  // Singleton implementation. Use GetInstance for getting instance.
+  IBusBridge();
+  friend struct DefaultSingletonTraits<IBusBridge>;
+
+  IBusInputContextHandlerInterface* input_context_handler_;
+  IBusEngineHandlerInterface* engine_handler_;
+  ibus::IBusPanelCandidateWindowHandlerInterface* candidate_window_handler_;
+  ibus::IBusPanelPropertyHandlerInterface* panel_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(IBusBridge);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_IME_IBUS_BRIDGE_H_