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diff --git a/src/wm_layer.hpp b/src/wm_layer.hpp
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+++ b/src/wm_layer.hpp
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+/*
+ * Copyright (c) 2017 TOYOTA MOTOR CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WM_LAYER_HPP
+#define WM_LAYER_HPP
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+#include <memory>
+#include "wm_error.hpp"
+
+struct json_object;
+
+namespace wm
+{
+
+class WMClient;
+class LayerState
+{
+  public:
+    LayerState();
+    ~LayerState() = default;
+    const std::unordered_map<std::string, std::string> getCurrentState();
+    const std::vector<unsigned> getIviIdList();
+    void addLayer(unsigned layer);
+    void removeLayer(unsigned layer);
+    void attachAppToArea(const std::string& app, const std::string& area);
+
+    // Debug
+    void dump();
+
+  private:
+    std::vector<unsigned> render_order;
+    std::unordered_map<std::string, std::string> area2appid;
+};
+
+class WMLayer
+{
+  public:
+    explicit WMLayer(json_object* j, unsigned wm_layer_id);
+    ~WMLayer() = default;
+
+    // Status & Setting API
+    unsigned getNewLayerID(const std::string& role);
+    unsigned idBegin() { return this->id_begin; }
+    unsigned idEnd()   { return this->id_end; }
+    unsigned getWMLayerID() { return this->wm_layer_id; }
+    const std::string& layerName();
+    void appendArea(const std::string& area);
+    LayerState& getLayerState() { return tmp_state; }
+    WMError setLayerState(const LayerState& l);
+    bool hasLayerID(unsigned id);
+    bool hasRole(const std::string& role);
+
+    // Manipulation
+    void addLayerToState(unsigned layer);
+    void removeLayerFromState(unsigned layer);
+    void attachAppToArea(const std::string& app, const std::string& area);
+    std::string attachedApp(const std::string& area);
+    void update();
+    void undo();
+
+    // Event
+    void appTerminated(unsigned layer);
+
+    // Debug
+    void dump();
+
+  private:
+    LayerState tmp_state;
+    LayerState state;
+    unsigned wm_layer_id;
+    std::string name = ""; // Layer name
+    std::string role_list;
+    std::vector<std::string> area_list;
+    std::vector<unsigned>    id_list;
+    unsigned id_begin;
+    unsigned id_end;
+};
+
+} // namespace wm
+
+#endif // WM_LAYER_HPP