Add PeripheralBatteryObserver

chrome/browser/chromeos/power/peripheral_battery_observer.h

+// Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_POWER_PERIPHERAL_BATTERY_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_POWER_PERIPHERAL_BATTERY_OBSERVER_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chromeos/dbus/power_manager_client.h"
+
+namespace chromeos {
+
+// This observer listens for peripheral device battery status and show
+// notifications for low battery conditions.
+class PeripheralBatteryObserver : public PowerManagerClient::Observer {
+ public:
+  // This class registers/unregisters itself as an observer in ctor/dtor.
+  PeripheralBatteryObserver();
+  virtual ~PeripheralBatteryObserver();
+
+  // PowerManagerClient::Observer implementation.
+  virtual void PeripheralBatteryStatusReceived(const std::string& path,
+                                               const std::string& name,
+                                               int level) OVERRIDE;
+ private:
+  class BatteryInfo {
+   public:
+    BatteryInfo() : level_(-1) {}
+    BatteryInfo(const std::string& path, const std::string& name, int level,
+                base::TimeDelta notification_timestamp,
+                base::TimeDelta update_timestamp)
+        : path_(path), name_(name), level_(level),
+          last_notification_timestamp_(notification_timestamp),
+          last_update_timestamp_(update_timestamp) {
+    }
+
+    const std::string& path() { return path_; }
+
+    const std::string& name() { return name_; }
+    void set_name(const std::string& name) { name_ = name; }
+
+    int level() { return level_; }
+    void set_level(int level) { level_ = level; }
+
+    const base::TimeDelta& last_notification_timestamp() {
+      return last_notification_timestamp_;
+    }
+    void set_notification_timestamp(const base::TimeDelta& timestamp) {
+      last_notification_timestamp_ = timestamp;
+    }
+
+    const base::TimeDelta& last_update_timestamp() {
+      return last_update_timestamp_;
+    }
+    void set_update_timestamp(const base::TimeDelta& timestamp) {
+      last_update_timestamp_ = timestamp;
+    }
+
+   private:
+    // Path to the sysfs entry for this peripheral device battery.
+    std::string path_;
+    // Human readable name for the device. It is changeable.
+    std::string name_;
+    // Battery leve within range [0, 100], and -1 for unknown level.
+    int level_;
+    base::TimeDelta last_notification_timestamp_;
+    base::TimeDelta last_update_timestamp_;
+  };
+
+  void PostNotification(BatteryInfo* battery);
+
+  std::map<std::string, BatteryInfo> batteries_;
+
+  DISALLOW_COPY_AND_ASSIGN(PeripheralBatteryObserver);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POWER_PERIPHERAL_BATTERY_OBSERVER_H_