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1 /* |
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2 * Copyright (c) 2004-2005 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * See class description below |
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16 * |
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17 */ |
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18 |
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19 |
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20 #ifndef __LANDMARKS_DB_EVENT_HANDLER_H__ |
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21 #define __LANDMARKS_DB_EVENT_HANDLER_H__ |
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22 |
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23 |
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24 #include "LandmarksDbObserver.h" |
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25 #include <e32base.h> |
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26 #include <EPos_Landmarks.h> |
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27 |
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28 |
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29 class CPosLandmarkDatabase; |
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30 class MLandmarksDbEventObserver; |
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31 |
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32 |
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33 |
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34 /** |
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35 * In the Landmark reference application there is only one instance of |
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36 * CLandmarksDbEventHandler. It is the only object observing the |
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37 * default landmark database directly. Other objects that want to observe the |
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38 * database must register to this object. When an event occurs this object |
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39 * broadcasts it to all registered observers. |
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40 */ |
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41 class CLandmarksDbEventHandler : public CActive |
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42 { |
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43 public: // Constructors and destructor |
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44 |
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45 /** |
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46 * C++ constructor. |
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47 * |
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48 * @param aDb the database to observer |
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49 */ |
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50 CLandmarksDbEventHandler( |
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51 CPosLandmarkDatabase& aDb); |
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52 |
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53 /** |
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54 * Destructor. |
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55 */ |
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56 ~CLandmarksDbEventHandler(); |
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57 |
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58 public: // New functions |
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59 |
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60 /** |
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61 * AddObserverL registers a db observer. |
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62 * |
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63 * @param aObserver the observer to register |
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64 */ |
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65 void AddObserverL(MLandmarksDbObserver* aObserver); |
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66 |
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67 protected: // from CActive |
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68 |
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69 /** |
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70 * Handles an active object’s request completion event. |
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71 */ |
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72 void RunL(); |
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73 |
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74 /** |
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75 * Implements cancellation of an outstanding request. |
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76 */ |
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77 void DoCancel(); |
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78 |
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79 /** |
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80 * Handles a leave occurring in the request completion event |
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81 * handler RunL(). |
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82 * |
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83 * @return KErrNone |
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84 */ |
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85 TInt RunError(TInt aError); |
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86 |
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87 private: |
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88 |
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89 /** |
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90 * Starts observing of db enevs |
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91 */ |
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92 void ObserveEvents(); |
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93 |
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94 private: |
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95 |
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96 //! The database to observe |
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97 CPosLandmarkDatabase& iDb; |
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98 |
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99 //! A db event to be reported |
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100 TPosLmEvent iEvent; |
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101 |
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102 //! An array of registered observers |
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103 RPointerArray<MLandmarksDbObserver> iDbObservers; |
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104 |
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105 }; |
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106 |
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107 |
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108 #endif // __LANDMARKS_DB_EVENT_HANDLER_H__ |
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109 |