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1 /* |
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2 * Copyright (c) 2002 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: LandmarksUi Content File - |
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15 * |
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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 |
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21 // INCLUDE FILES |
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22 #include "CLmkDbEventListener.h" |
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23 #include "MLmkDbObserver.h" |
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24 #include <EPos_CPosLandmarkDatabase.h> |
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25 #include <lmkerrors.h> |
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26 |
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27 |
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28 // CONSTANTS |
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29 /// Unnamed namespace for local definitions |
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30 namespace { |
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31 |
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32 const TInt KLmkEventObserversGranularity( 5 ); |
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33 |
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34 #if defined(_DEBUG) |
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35 _LIT( KPanicMsg, "CLmkDbEventListener" ); |
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36 void Panic( TPanicCode aReason ) |
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37 { |
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38 User::Panic( KPanicMsg, aReason ); |
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39 } |
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40 #endif |
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41 } // namespace |
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42 // ============================ MEMBER FUNCTIONS =============================== |
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43 |
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44 // ----------------------------------------------------------------------------- |
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45 // CLmkDbEventListener::CLmkDbEventListener |
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46 // C++ constructor can NOT contain any code, that |
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47 // might leave. |
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48 // ----------------------------------------------------------------------------- |
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49 // |
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50 CLmkDbEventListener::CLmkDbEventListener() |
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51 : CActive( EPriorityStandard ), |
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52 iObservers( KLmkEventObserversGranularity ) |
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53 { |
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54 } |
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55 |
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56 // ----------------------------------------------------------------------------- |
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57 // CLmkDbEventListener::ConstructL |
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58 // Symbian 2nd phase constructor can leave. |
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59 // ----------------------------------------------------------------------------- |
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60 // |
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61 void CLmkDbEventListener::ConstructL() |
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62 { |
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63 CActiveScheduler::Add( this ); |
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64 } |
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65 |
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66 // ----------------------------------------------------------------------------- |
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67 // CLmkDbEventListener::NewL |
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68 // Two-phased constructor. |
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69 // ----------------------------------------------------------------------------- |
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70 // |
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71 CLmkDbEventListener* CLmkDbEventListener::NewL() |
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72 { |
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73 CLmkDbEventListener* self = |
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74 new ( ELeave ) CLmkDbEventListener(); |
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75 |
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76 CleanupStack::PushL( self ); |
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77 self->ConstructL(); |
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78 CleanupStack::Pop(); |
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79 |
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80 return self; |
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81 } |
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82 |
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83 // ----------------------------------------------------------------------------- |
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84 // CLmkDbEventListener::~CLmkDbEventListener |
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85 // ----------------------------------------------------------------------------- |
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86 // |
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87 CLmkDbEventListener::~CLmkDbEventListener() |
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88 { |
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89 Cancel(); |
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90 iObservers.Close(); |
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91 delete iDbURI; |
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92 } |
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93 |
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94 // ----------------------------------------------------------------------------- |
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95 // CLmkDbEventListener::AddObserverL |
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96 // ----------------------------------------------------------------------------- |
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97 // |
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98 void CLmkDbEventListener::AddObserverL( |
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99 MLmkDbObserver& aObserver, |
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100 CPosLandmarkDatabase& aDb ) |
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101 { |
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102 HBufC* paramURI = aDb.DatabaseUriLC(); |
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103 if ( iDb ) |
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104 { // Only one database currently supported |
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105 if ( iDbURI->Compare( *paramURI ) != 0 ) |
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106 { |
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107 User::Leave( KErrNotSupported ); |
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108 } |
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109 } |
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110 |
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111 TInt index = iObservers.Find( &aObserver ); |
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112 if ( index >= 0 ) |
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113 { |
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114 User::Leave( KErrAlreadyExists ); |
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115 } |
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116 |
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117 User::LeaveIfError( iObservers.Append( &aObserver ) ); |
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118 if ( iObservers.Count() == 1 ) |
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119 { |
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120 iDb = &aDb; |
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121 StartListening(); |
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122 } |
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123 |
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124 // For simplicity we always assign new value to iDbURI although often |
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125 // the content remains the same as it was. |
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126 delete iDbURI; |
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127 iDbURI = paramURI; |
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128 CleanupStack::Pop(); // paramURI, ownership was transferred |
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129 } |
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130 |
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131 // ----------------------------------------------------------------------------- |
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132 // CLmkDbEventListener::RemoveObserver |
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133 // ----------------------------------------------------------------------------- |
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134 // |
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135 void CLmkDbEventListener::RemoveObserver( MLmkDbObserver& aObserver ) |
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136 { |
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137 TInt index = iObservers.Find( &aObserver ); |
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138 if ( index >= 0 ) |
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139 { |
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140 iObservers.Remove( index ); |
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141 } |
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142 if ( iObservers.Count() == 0 ) |
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143 { |
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144 Cancel(); |
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145 } |
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146 } |
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147 |
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148 // ----------------------------------------------------------------------------- |
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149 // CLmkDbEventListener::StartListening |
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150 // ----------------------------------------------------------------------------- |
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151 // |
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152 void CLmkDbEventListener::StartListening() |
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153 { |
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154 iEvent.iEventType = EPosLmEventUnknownChanges; |
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155 iEvent.iLandmarkItemId = KPosLmNullItemId; |
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156 __ASSERT_DEBUG( !IsActive(), Panic( KLmkPanicAlreadyActive ) ); |
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157 __ASSERT_DEBUG( iDb, Panic( KLmkPanicNullMember ) ); |
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158 iDb->NotifyDatabaseEvent( iEvent, iStatus ); |
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159 SetActive(); |
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160 } |
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161 |
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162 // ----------------------------------------------------------------------------- |
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163 // CLmkDbEventListener::RunL |
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164 // ----------------------------------------------------------------------------- |
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165 // |
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166 void CLmkDbEventListener::RunL() |
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167 { |
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168 // No need for implementing RunError() as long as RunL() is non-leaving. |
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169 for ( TInt i( 0 ); i < iObservers.Count(); ++i ) |
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170 { |
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171 iObservers[i]->HandleDatabaseEvent( iEvent ); |
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172 } |
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173 StartListening(); |
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174 } |
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175 |
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176 // ----------------------------------------------------------------------------- |
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177 // CLmkDbEventListener::DoCancel |
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178 // ----------------------------------------------------------------------------- |
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179 // |
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180 void CLmkDbEventListener::DoCancel() |
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181 { |
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182 if ( iDb ) |
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183 { |
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184 iDb->CancelNotifyDatabaseEvent(); |
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185 // The policy is that when database observation is stopped we |
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186 // release the database association. It may become invalid after that. |
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187 iDb = NULL; |
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188 delete iDbURI; |
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189 iDbURI = NULL; |
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190 } |
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191 } |
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192 |
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193 // End of File |