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1 /* |
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2 * Copyright (c) 2007-2008 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 #include "hnconditionfactory.h" |
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20 #include "hnsimplecondition.h" |
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21 #include "hncomplexcondition.h" |
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22 #include "hnglobals.h" |
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23 |
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24 // ======== MEMBER FUNCTIONS ======== |
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25 |
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26 // --------------------------------------------------------------------------- |
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27 // |
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28 // --------------------------------------------------------------------------- |
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29 // |
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30 CHnConditionInterface* HnConditionFactory::NewL( TXmlEngAttr aElement ) |
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31 { |
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32 CHnConditionInterface* self = HnConditionFactory::NewLC( aElement ); |
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33 CleanupStack::Pop( self ); |
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34 return self; |
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35 } |
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36 |
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37 |
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38 // --------------------------------------------------------------------------- |
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39 // |
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40 // --------------------------------------------------------------------------- |
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41 // |
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42 CHnConditionInterface* HnConditionFactory::NewLC( TXmlEngAttr aElement ) |
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43 { |
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44 TPtrC8 condition = aElement.Value(); |
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45 CHnConditionInterface* self = ConstructConditionL( condition ); |
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46 CleanupStack::PushL( self ); |
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47 return self; |
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48 } |
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49 |
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50 // --------------------------------------------------------------------------- |
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51 // |
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52 // --------------------------------------------------------------------------- |
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53 // |
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54 CHnConditionInterface* HnConditionFactory::NewL( TDesC8 & aElement ) |
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55 { |
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56 CHnConditionInterface* self = HnConditionFactory::NewLC( aElement ); |
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57 CleanupStack::Pop( self ); |
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58 return self; |
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59 } |
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60 |
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61 |
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62 // --------------------------------------------------------------------------- |
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63 // |
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64 // --------------------------------------------------------------------------- |
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65 // |
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66 CHnConditionInterface* HnConditionFactory::NewLC( TDesC8 & aElement ) |
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67 { |
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68 CHnConditionInterface* self = HnConditionFactory::ConstructConditionL( aElement ); |
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69 CleanupStack::PushL( self ); |
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70 return self; |
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71 } |
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72 |
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73 // --------------------------------------------------------------------------- |
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74 // |
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75 // --------------------------------------------------------------------------- |
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76 // |
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77 void HnConditionFactory::TrimConditionL( RBuf8 & aConditionString ) |
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78 { |
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79 TBool ret; |
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80 do |
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81 { |
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82 ret = EFalse; |
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83 aConditionString.TrimAll(); |
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84 TInt conditionLastIndex = aConditionString.Length()-1; |
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85 if (aConditionString[0] == EOpeningBrace |
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86 && aConditionString[conditionLastIndex] == EClosingBrace ) |
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87 { |
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88 aConditionString[0] = ESpace; |
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89 aConditionString[conditionLastIndex] = ESpace; |
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90 |
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91 ret = ETrue; |
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92 |
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93 if ( CheckBraceIntegrityL( aConditionString ) ) |
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94 { |
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95 aConditionString[0] = EOpeningBrace; |
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96 aConditionString[conditionLastIndex] = EClosingBrace; |
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97 ret = EFalse; |
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98 } |
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99 } |
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100 } |
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101 while (ret); |
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102 } |
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103 |
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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 TBool HnConditionFactory::CheckBraceIntegrityL( TDesC8 & aConditionString ) |
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109 { |
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110 TInt ret(KErrNone); |
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111 TLex8 lexer( aConditionString ); |
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112 TInt lookForClosingBrace( 0 ); |
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113 while ( !lexer.Eos() ) |
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114 { |
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115 switch ( TUint( lexer.Get() ) ) |
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116 { |
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117 case EOpeningBrace : |
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118 lookForClosingBrace++; |
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119 break; |
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120 case EClosingBrace : |
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121 lookForClosingBrace--; |
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122 if (lookForClosingBrace < 0) |
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123 { |
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124 ret = KErrGeneral; |
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125 lexer.Inc( lexer.Remainder().Length() ); |
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126 } |
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127 break; |
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128 } |
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129 } |
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130 |
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131 if (lookForClosingBrace > 0) |
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132 { |
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133 ret = KErrGeneral; |
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134 } |
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135 |
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136 return ret; |
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137 } |
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138 // --------------------------------------------------------------------------- |
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139 // |
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140 // --------------------------------------------------------------------------- |
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141 // |
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142 CHnConditionInterface* HnConditionFactory::ConstructConditionL( |
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143 TDesC8 & aConditionString ) |
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144 { |
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145 RBuf8 condition; |
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146 CleanupClosePushL( condition ); |
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147 condition.CreateL( aConditionString ); |
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148 HnConditionFactory::TrimConditionL( condition ); |
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149 User::LeaveIfError( HnConditionFactory::CheckBraceIntegrityL(condition) ); |
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150 |
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151 CHnConditionInterface* ret = NULL; |
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152 |
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153 if ( aConditionString.Find( HnLogicalRelations::KLogicalAnd8 ) == KErrNotFound |
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154 && aConditionString.Find( HnLogicalRelations::KLogicalOr8 ) == KErrNotFound ) |
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155 { |
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156 ret = CHnSimpleCondition::NewL( condition ); |
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157 } |
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158 else |
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159 { |
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160 ret = CHnComplexCondition::NewL( condition ); |
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161 } |
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162 |
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163 CleanupStack::PopAndDestroy( &condition ); |
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164 return ret; |
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165 } |
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166 |