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1 /* |
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2 * Copyright (c) 2007-2009 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 * |
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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 FEATDISCOVERY_H |
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21 #define FEATDISCOVERY_H |
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22 |
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23 // INCLUDES |
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24 #include <e32base.h> |
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25 |
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26 class CFeatureDiscoveryImpl; |
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27 |
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28 /** |
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29 Wrapper class used for multiple feature queries. |
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30 @publishedAll |
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31 @released |
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32 */ |
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33 |
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34 class TFeatureSet |
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35 { |
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36 public: |
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37 |
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38 /** |
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39 Constructor |
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40 */ |
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41 IMPORT_C TFeatureSet(); |
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42 |
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43 /** |
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44 Destructor |
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45 */ |
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46 IMPORT_C ~TFeatureSet(); |
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47 |
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48 /** |
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49 Method to add features before querying support statuses. This |
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50 method must be called to initialize feature array before querying |
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51 support statuses from server with FeaturesSupported(L) and finally |
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52 check the status with a call to IsFeatureSupported or AreAllFeaturesSupported. |
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53 |
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54 @return KErrNone if feature addition succeded. |
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55 Otherwise one of the Symbian OS error codes |
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56 */ |
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57 IMPORT_C TInt Append( TUid aFeature ); |
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58 |
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59 /** |
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60 Method to check feature's support status. |
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61 |
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62 @param aFeature is the feature UID of the feature that is queried. |
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63 @return a TBool indicating whether the feature is supported (ETrue) |
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64 or not (EFalse). If the feature does not exist, the return value is |
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65 EFalse. |
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66 */ |
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67 IMPORT_C TBool IsFeatureSupported( TUid aFeature ) const; |
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68 |
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69 /** |
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70 Method to check whether all features queried are supported. |
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71 |
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72 @return ETrue if all features queried are supported or no features have been queried. |
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73 Otherwise EFalse. |
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74 */ |
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75 IMPORT_C TBool AreAllFeaturesSupported() const; |
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76 |
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77 public: // For CFeatureDiscoveryImpl internal use |
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78 |
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79 // Count number of features in TFeatureStat array. |
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80 TInt Count(); |
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81 |
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82 // Return id of feature in requested index from TFeatureStat array. |
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83 TUid FeatureId( TInt aIndex ) const; |
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84 |
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85 // Reset TFeatureStat array. |
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86 void Reset(); |
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87 |
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88 // Append feature and status object into TFeatureStat array |
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89 TInt Append( TUid aFeature, TBool aSupported ); |
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90 |
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91 private: |
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92 struct TFeatureStat |
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93 { |
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94 TUid iFeatureID; |
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95 TBool iSupported; |
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96 }; |
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97 |
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98 private: |
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99 // Feature id, status array |
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100 RArray<TFeatureStat> iStatus; |
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101 |
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102 // Counter for checking feature count before and after query |
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103 TInt iCount; |
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104 |
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105 // Reserved for future use. |
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106 TUint32 iReserved; |
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107 }; |
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108 |
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109 /** |
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110 The feature discovery API provides methods which are used to query which |
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111 features are supported in the environment. |
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112 |
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113 @publishedAll |
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114 @released |
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115 */ |
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116 class CFeatureDiscovery : public CBase |
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117 { |
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118 public: |
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119 |
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120 /** |
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121 This is a two-phase constructor method that is used to create |
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122 a new instance of the CFeatureDiscovery class. |
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123 |
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124 @return a pointer to a new instance of the CFeatureDiscovery class. |
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125 |
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126 @leave Any One of the Symbian OS system-wide error codes |
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127 */ |
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128 IMPORT_C static CFeatureDiscovery* NewL(); |
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129 |
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130 /** |
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131 This is a two-phase constructor method that is used to create |
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132 a new instance of the CFeatureDiscovery class. This method leaves |
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133 the instance of the object on the cleanup stack. |
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134 |
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135 @return a pointer to a new instance of the CFeatureDiscovery class. |
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136 |
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137 @leave Any One of the Symbian OS system-wide error codes |
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138 */ |
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139 IMPORT_C static CFeatureDiscovery* NewLC(); |
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140 |
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141 /** |
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142 Destructor. |
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143 */ |
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144 virtual ~CFeatureDiscovery(); |
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145 |
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146 /** |
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147 Static method to query the supported status of a feature on the |
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148 device. |
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149 |
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150 @deprecated Use IsFeatureSupportedL(TUid aFeature) instead. |
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151 |
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152 @param aFeature is the feature ID of the feature that is queried. |
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153 @return a TBool indicating whether the feature is supported (ETrue) |
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154 or not (EFalse). If the feature does not exist, the return value is |
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155 EFalse. |
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156 |
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157 @leave Any One of the Symbian OS system-wide error codes |
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158 */ |
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159 IMPORT_C static TBool IsFeatureSupportedL( TInt aFeature ); |
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160 |
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161 /** |
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162 Dynamic method to query the supported status of a feature on the |
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163 device. Before calling the method an instance of the CFeatureDiscovery |
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164 class must be created by using one of the factory methods, |
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165 NewL() or NewLC(). The created instance must be deleted after use. |
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166 |
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167 @deprecated Use IsSupported(TUid aFeature) instead. |
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168 |
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169 @param aFeature is the feature ID of the feature that is queried. |
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170 @return a TBool indicating whether the feature is supported (ETrue) |
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171 or not (EFalse). If the feature does not exist, the return value is |
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172 EFalse. |
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173 */ |
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174 IMPORT_C TBool IsSupported( TInt aFeature ) const ; |
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175 |
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176 /** |
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177 Static method to query the supported status of a feature on the device. |
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178 |
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179 @param aFeature is the feature UID of the feature that is queried. |
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180 @return a TBool indicating whether the feature is supported (ETrue) |
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181 or not (EFalse). If the feature does not exist, the return value is |
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182 EFalse. |
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183 |
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184 @leave Any One of the Symbian OS system-wide error codes |
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185 */ |
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186 IMPORT_C static TBool IsFeatureSupportedL( TUid aFeature ); |
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187 |
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188 /** |
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189 Dynamic method to query the supported status of a feature on the device. |
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190 |
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191 Before calling the method an instance of the CFeatureDiscovery class must |
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192 be created by using one of the factory methods, NewL() or NewLC(). |
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193 The created instance must be deleted after use. |
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194 |
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195 @param aFeature is the feature UID of the feature that is queried. |
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196 @return a TBool indicating whether the feature is supported (ETrue) |
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197 or not (EFalse). If the feature does not exist, the return value is |
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198 EFalse. |
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199 */ |
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200 IMPORT_C TBool IsSupported( TUid aFeature ) const ; |
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201 |
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202 /** |
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203 Static method to query the supported status of a set of features |
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204 on the device. |
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205 |
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206 @param aFeatures is the wrapper class for feature array queried. |
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207 |
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208 @leave Any One of the Symbian OS system-wide error codes |
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209 */ |
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210 IMPORT_C static void FeaturesSupportedL( TFeatureSet& aFeatures ); |
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211 |
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212 /** |
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213 Dynamic method to query the supported status of a set of features |
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214 on the device. Before calling the method an instance of the |
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215 CFeatureDiscovery class need to be created by using one of the |
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216 factory methods, NewL() or NewLC(). The created instance must be |
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217 deleted after use. |
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218 |
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219 @param aFeatures is the wrapper class for feature array queried. |
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220 @return KErrNone if status query succeeded. |
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221 Otherwise one of the Symbian OS error codes |
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222 */ |
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223 IMPORT_C TInt FeaturesSupported( TFeatureSet& aFeatures ) const; |
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224 |
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225 private: |
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226 |
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227 /** |
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228 C++ default constructor. |
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229 */ |
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230 CFeatureDiscovery(); |
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231 |
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232 /** |
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233 By default Symbian OS constructor is private. |
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234 */ |
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235 void ConstructL(); |
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236 |
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237 private: |
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238 |
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239 // Feature discovery implementation class |
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240 CFeatureDiscoveryImpl* iImpl; |
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241 } ; |
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242 |
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243 /** |
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244 Usage: |
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245 |
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246 @code |
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247 #include <featdiscovery.h> |
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248 #include <featureinfo.h> // for feature definitions |
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249 |
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250 // replace <featureUIDx> with a real UID ) |
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251 |
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252 // If querying only one feature, it is more efficient to use the class |
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253 // via the static method, IsFeatureSupportedL(). |
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254 // When querying more than one feature, it is more efficient to use the |
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255 // class by creating an instance and calling the IsSupported() method. |
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256 |
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257 // Static way of using the class: |
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258 TBool isSupported = CFeatureDiscovery::IsFeatureSupportedL(<featureUIDx>); |
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259 |
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260 // Dynamic way of using the class using NewL(): |
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261 |
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262 // Call NewL() to create an instance of CFeatureDiscovery. |
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263 CFeatureDiscovery* testA = CFeatureDiscovery::NewL(); |
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264 |
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265 // Call the exported IsSupported() method to query whether features |
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266 // are supported in the current environment or not. |
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267 TBool usbSupported = testA->IsSupported(<featureUIDx>); |
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268 TBool mmcSupported = testA->IsSupported(<featureUIDx>); |
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269 |
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270 // Delete the created instance of CFeatureDiscovery. |
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271 delete testA; |
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272 |
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273 // Dynamic way of using the class using NewLC(): |
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274 |
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275 // Call NewLC() to create an instance of CFeatureDiscovery. |
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276 // The method leaves the instance of the object on the cleanup stack. |
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277 CFeatureDiscovery* testB = CFeatureDiscovery::NewLC(); |
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278 |
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279 // Call the exported IsSupported() method to query whether features |
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280 // are supported in the current environment or not. |
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281 TBool wcdmaSupported = testB->IsSupported(<featureUIDx>); |
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282 TBool gsmSupported = testB->IsSupported(<featureUIDx>); |
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283 |
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284 // Dynamic way of using multiple feature query. This is preferred |
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285 // way to fetch support statuses if there are several features to be |
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286 // queried, because it involves less inter-process communication. |
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287 |
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288 TFeatureSet featset; |
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289 User::LeaveIfError( featset.Append( <featureUIDx> ) ); |
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290 User::LeaveIfError( featset.Append( <featureUIDx> ) ); |
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291 TInt err = testB->FeaturesSupported( featset ); |
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292 if(!err) |
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293 { |
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294 TBool uid1Supported = featset.IsFeatureSupported(<featureUIDx>); |
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295 TBool uid2Supported = featset.IsFeatureSupported(<featureUIDx>); |
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296 // ... or whether all QUERIED features are supported |
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297 TBool allSupported = featset.AreAllFeaturesSupported(); |
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298 } |
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299 // featset cleans array up in destructor on scope exit |
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300 |
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301 // Pop and delete the created instance of CFeatureDiscovery. |
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302 CleanupStack::PopAndDestroy(); |
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303 @endcode |
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304 */ |
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305 #endif // FEATDISCOVERY_H |
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306 |
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307 // End of File |