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1 /* |
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2 * Copyright (c) 2005-2007 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: Policy evaluator |
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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 "xnnodeappif.h" |
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20 #include "xnproperty.h" |
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21 #include "xnuiengineappif.h" |
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22 #include "policyevaluator.h" |
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23 #include "aipolicyelement.h" |
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24 #include "aixmluiutils.h" |
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25 #include "aistrcnv.h" |
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26 #include "aixmluiconstants.h" |
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27 |
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28 namespace |
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29 { |
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30 |
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31 void ReplaceCharacters( TDes8& aDes, |
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32 TChar aOriginal, |
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33 TChar aNew ) |
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34 { |
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35 if ( aDes.Length() == 0 ) |
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36 { |
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37 return; |
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38 } |
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39 |
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40 TPtr8 des = aDes.MidTPtr(0); |
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41 TInt pos = des.Locate( aOriginal ); |
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42 |
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43 while ( pos != KErrNotFound ) |
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44 { |
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45 des[ pos++ ] = aNew; |
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46 |
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47 if ( pos == des.Length() ) |
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48 { |
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49 break; |
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50 } |
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51 |
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52 des.Set( des.MidTPtr( pos ) ); |
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53 pos = des.Locate( aOriginal ); |
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54 } |
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55 } |
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56 |
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57 } |
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58 |
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59 using namespace AiXmlUiController; |
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60 |
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61 enum EAI2Policies |
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62 { |
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63 KAI2PolUnset = 0, |
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64 KAI2PolShow, |
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65 KAI2PolHide, |
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66 }; |
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67 |
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68 // ======== MEMBER FUNCTIONS ======== |
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69 |
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70 CPolicyEvaluator::CPolicyEvaluator() |
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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 void CPolicyEvaluator::ConstructL() |
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76 { |
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77 } |
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78 |
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79 |
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80 CPolicyEvaluator* CPolicyEvaluator::NewL() |
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81 { |
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82 CPolicyEvaluator* self = new( ELeave ) CPolicyEvaluator; |
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83 return self; |
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84 } |
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85 |
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86 |
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87 CPolicyEvaluator::~CPolicyEvaluator() |
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88 { |
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89 } |
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90 |
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91 void CPolicyEvaluator::EvaluateContentPolicyL( CXnNodeAppIf& aTarget, |
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92 RAiPolicyElementArray& aPolicyArray ) |
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93 { |
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94 EvaluatePolicyL( aTarget, |
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95 aPolicyArray, |
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96 AiUiDef::xml::policy::KContent ); |
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97 } |
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98 |
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99 void CPolicyEvaluator::EvaluateEmptyContentPolicyL( CXnNodeAppIf& aTarget, |
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100 RAiPolicyElementArray& aPolicyArray ) |
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101 { |
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102 EvaluatePolicyL( aTarget, |
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103 aPolicyArray, |
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104 AiUiDef::xml::policy::KEmptyContent ); |
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105 } |
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106 |
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107 void CPolicyEvaluator::EvaluateVisibilityPolicyL( CXnNodeAppIf& aTarget, |
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108 RAiPolicyElementArray& aPolicyArray ) |
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109 { |
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110 EvaluatePolicyL( aTarget, |
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111 aPolicyArray, |
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112 AiUiDef::xml::policy::KVisibilityPolicy ); |
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113 } |
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114 |
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115 void CPolicyEvaluator::EvaluateContentChangedPolicyL( CXnNodeAppIf& aTarget, |
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116 RAiPolicyElementArray& aPolicyArray ) |
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117 { |
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118 EvaluatePolicyL( aTarget, |
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119 aPolicyArray, |
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120 AiUiDef::xml::policy::KContentChanged ); |
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121 } |
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122 |
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123 void CPolicyEvaluator::EvaluateResourcePolicyL( CXnNodeAppIf& aTarget, |
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124 CXnNodeAppIf& aResource, |
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125 RAiPolicyElementArray& aPolicyArray ) |
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126 { |
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127 RPointerArray< CXnNodeAppIf > policyArray = |
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128 FindPropertyElementL( aTarget, |
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129 AiUiDef::xml::policy::KResource ); |
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130 |
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131 CleanupClosePushL( policyArray ); |
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132 |
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133 aPolicyArray.ReserveL( aPolicyArray.Count() + policyArray.Count() ); |
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134 |
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135 for ( TInt i = 0; i < policyArray.Count(); ++i ) |
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136 { |
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137 CXnNodeAppIf* property = policyArray[ i ]; |
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138 |
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139 // Get name property to lookup target ui element |
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140 const TDesC8* name = PropertyValue( *property, |
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141 AiUiDef::xml::property::KName ); |
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142 |
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143 CXnNodeAppIf* target = NULL; |
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144 if( name ) |
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145 { |
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146 // Lookup target ui element |
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147 target = property->UiEngineL()->FindNodeByIdL( *name, property->Namespace() ); |
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148 } |
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149 |
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150 if ( !target ) |
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151 { |
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152 // No target found. Continue with next property |
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153 continue; |
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154 } |
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155 |
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156 const TDesC8* value = PropertyValue( *property, |
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157 AiUiDef::xml::property::KValue ); |
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158 |
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159 if ( !value ) |
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160 { |
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161 // No value found. Continue with next property |
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162 continue; |
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163 } |
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164 |
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165 // Check if resource matches condition |
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166 const TDesC8* id = PropertyValue( aResource, |
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167 XnPropertyNames::common::KId ); |
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168 |
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169 if ( !id ) |
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170 { |
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171 continue; |
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172 } |
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173 |
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174 TInt conditionEnd = value->Locate( KRightParenthesis ); |
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175 |
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176 if ( conditionEnd++ < 0 ) |
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177 { |
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178 continue; |
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179 } |
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180 |
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181 TPtrC8 condition( value->Left( conditionEnd ) ); |
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182 TPtrC8 cssValue( value->Mid( conditionEnd ) ); |
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183 |
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184 HBufC8* condBuffer = condition.AllocL(); |
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185 TPtr8 condPtr = condBuffer->Des(); |
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186 ReplaceCharacters( condPtr, KLeftParenthesis, KWhiteSpace ); |
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187 ReplaceCharacters( condPtr, KComma, KWhiteSpace ); |
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188 ReplaceCharacters( condPtr, KRightParenthesis, KWhiteSpace ); |
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189 |
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190 if ( MatchCondition( *id, condPtr ) ) |
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191 { |
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192 // Append target and value. |
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193 // This cannot fail because space has been reserved. |
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194 aPolicyArray.Append( TAiPolicyElement( *target, cssValue ) ); |
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195 } |
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196 |
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197 delete condBuffer; |
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198 } |
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199 |
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200 CleanupStack::PopAndDestroy( &policyArray ); |
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201 } |
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202 |
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203 void CPolicyEvaluator::EvaluatePolicyL( CXnNodeAppIf& aTarget, |
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204 RAiPolicyElementArray& aPolicyArray, |
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205 const TDesC8& aPolicyClass ) |
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206 { |
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207 RPointerArray< CXnNodeAppIf > policyArray = |
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208 FindPropertyElementL( aTarget, |
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209 aPolicyClass ); |
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210 |
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211 CleanupClosePushL( policyArray ); |
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212 |
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213 aPolicyArray.ReserveL( aPolicyArray.Count() + policyArray.Count() ); |
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214 |
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215 for ( TInt i = 0; i < policyArray.Count(); ++i ) |
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216 { |
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217 CXnNodeAppIf* property = policyArray[ i ]; |
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218 |
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219 // Get name property to lookup target ui element |
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220 const TDesC8* name = PropertyValue( *property, |
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221 AiUiDef::xml::property::KName ); |
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222 |
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223 CXnNodeAppIf* target = NULL; |
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224 if( name ) |
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225 { |
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226 // Lookup target ui element |
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227 target = property->UiEngineL()->FindNodeByIdL( *name, property->Namespace() ); |
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228 } |
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229 |
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230 if ( !target ) |
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231 { |
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232 // No target found. Continue with next property |
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233 continue; |
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234 } |
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235 |
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236 const TDesC8* value = PropertyValue( *property, |
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237 AiUiDef::xml::property::KValue ); |
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238 |
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239 if ( !value ) |
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240 { |
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241 // No value found. Continue with next property |
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242 continue; |
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243 } |
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244 |
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245 if( aPolicyClass == AiUiDef::xml::policy::KVisibilityPolicy ) |
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246 { |
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247 TInt conditionEnd = value->Locate( KRightParenthesis ); |
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248 |
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249 if ( conditionEnd++ < 0 ) |
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250 { |
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251 continue; |
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252 } |
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253 |
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254 TPtrC8 condition( value->Left( conditionEnd ) ); |
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255 TPtrC8 cssValue( value->Mid( conditionEnd ) ); |
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256 |
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257 HBufC8* condBuffer = condition.AllocLC(); |
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258 TPtr8 condPtr = condBuffer->Des(); |
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259 ReplaceCharacters( condPtr, KLeftParenthesis, KWhiteSpace ); |
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260 ReplaceCharacters( condPtr, KComma, KWhiteSpace ); |
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261 ReplaceCharacters( condPtr, KRightParenthesis, KWhiteSpace ); |
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262 |
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263 if ( MatchVisibilityConditionL( condPtr, *property, aPolicyArray ) ) |
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264 { |
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265 // Append target and value. |
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266 // This cannot fail because space has been reserved. |
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267 aPolicyArray.Append( TAiPolicyElement( *target, cssValue ) ); |
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268 } |
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269 |
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270 CleanupStack::PopAndDestroy( condBuffer ); |
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271 } |
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272 else |
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273 { |
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274 // Append target and value. |
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275 // This cannot fail because space has been reserved. |
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276 aPolicyArray.Append( TAiPolicyElement( *target, *value ) ); |
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277 } |
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278 } |
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279 |
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280 CleanupStack::PopAndDestroy( &policyArray ); |
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281 } |
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282 |
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283 TBool CPolicyEvaluator::MatchCondition( const TDesC8& aId, |
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284 const TDesC8& aCondition ) |
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285 { |
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286 TBool negation = EFalse; |
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287 |
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288 TLex8 parser( aCondition ); |
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289 |
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290 if ( parser.NextToken() == AiUiDef::xml::policy::KCondition ) |
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291 { |
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292 // Condition found |
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293 parser.SkipSpace(); |
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294 |
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295 // check negation |
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296 if ( parser.Get() == KNotOperator ) |
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297 { |
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298 negation = ETrue; |
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299 } |
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300 else |
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301 { |
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302 parser.UnGet(); |
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303 } |
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304 |
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305 parser.SkipSpace(); |
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306 |
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307 TBool found = EFalse; |
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308 |
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309 // Find id from the list. Stop when found or in the end of string. |
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310 while ( !parser.Eos() ) |
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311 { |
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312 if ( parser.NextToken() == aId ) |
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313 { |
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314 found = ETrue; |
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315 break; |
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316 } |
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317 } |
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318 |
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319 // Test if id matches the given condition |
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320 return ( ( found && !negation ) || ( !found && negation ) ); // found XOR negation |
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321 } |
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322 else |
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323 { |
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324 return EFalse; |
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325 } |
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326 |
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327 } |
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328 |
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329 TBool CPolicyEvaluator::MatchVisibilityConditionL( const TDesC8& aCondition, |
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330 CXnNodeAppIf& aProperty, |
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331 RAiPolicyElementArray& aPolicyArray ) |
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332 { |
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333 TBool negation = EFalse; |
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334 TBool andOperation = EFalse; |
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335 TInt nodesVisible = 0; // for managing the end of 'or' op. |
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336 |
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337 TLex8 parser( aCondition ); |
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338 |
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339 if ( parser.NextToken() == AiUiDef::xml::policy::KCondition ) |
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340 { |
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341 // Condition found |
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342 parser.SkipSpace(); |
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343 |
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344 // check negation |
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345 if ( parser.Get() == KNotOperator ) |
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346 { |
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347 negation = ETrue; |
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348 } |
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349 else |
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350 { |
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351 parser.UnGet(); |
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352 } |
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353 |
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354 if ( parser.Get() == KAndOperator ) |
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355 { |
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356 andOperation = ETrue; |
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357 } |
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358 else |
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359 { |
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360 parser.UnGet(); |
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361 } |
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362 |
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363 parser.SkipSpace(); |
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364 |
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365 // Determine aCondition lists visibilities. Stop when: |
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366 // - Eos reached |
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367 // - First 'false' in 'and' op |
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368 // - First 'true' in 'or' op |
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369 while ( !parser.Eos() ) |
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370 { |
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371 TPtrC8 id( parser.NextToken() ); |
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372 CXnNodeAppIf* target = NULL; |
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373 TBool nodeVisible = EFalse; |
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374 |
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375 TBool displayBlockSet = KAI2PolUnset; |
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376 TBool visibilityVisibleSet = KAI2PolUnset; |
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377 |
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378 // Lookup target ui element |
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379 target = aProperty.UiEngineL()->FindNodeByIdL( id, aProperty.Namespace() ); |
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380 |
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381 if( target ) |
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382 { |
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383 // first try to first the display or visibility property updates from policy array |
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384 for( TInt i = 0; i < aPolicyArray.Count(); ++i ) |
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385 { |
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386 if( &(aPolicyArray[i].Target()) == target ) |
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387 { |
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388 if( aPolicyArray[i].Name() == XnPropertyNames::style::common::KDisplay ) |
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389 { |
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390 if( aPolicyArray[i].Value() == |
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391 XnPropertyNames::style::common::display::KBlock ) |
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392 { |
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393 displayBlockSet = KAI2PolShow; |
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394 } |
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395 else if( aPolicyArray[i].Value() == |
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396 XnPropertyNames::style::common::display::KNone ) |
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397 { |
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398 displayBlockSet = KAI2PolHide; |
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399 } |
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400 } |
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401 if( aPolicyArray[i].Name() == XnPropertyNames::style::common::KVisibility ) |
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402 { |
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403 if( aPolicyArray[i].Value() == |
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404 XnPropertyNames::style::common::visibility::KVisible ) |
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405 { |
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406 visibilityVisibleSet = KAI2PolShow; |
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407 } |
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408 else if( aPolicyArray[i].Value() == |
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409 XnPropertyNames::style::common::visibility::KHidden ) |
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410 { |
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411 visibilityVisibleSet = KAI2PolHide; |
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412 } |
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413 } |
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414 } |
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415 } |
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416 |
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417 HBufC* displayPropertyValue = NULL; |
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418 if( !displayBlockSet ) |
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419 { |
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420 // Only check CSS if policy array did not set the value |
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421 displayPropertyValue = PropertyValueL( |
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422 *target, |
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423 XnPropertyNames::style::common::KDisplay ); |
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424 CleanupStack::PushL( displayPropertyValue ); |
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425 |
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426 if( displayPropertyValue ) |
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427 { |
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428 HBufC8* buf8 = NULL; |
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429 buf8 = AiUtility::CopyToBufferL( buf8, *displayPropertyValue ); |
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430 if( buf8 ) |
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431 { |
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432 if( *buf8 == XnPropertyNames::style::common::display::KBlock ) |
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433 { |
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434 displayBlockSet = KAI2PolShow; |
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435 } |
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436 else |
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437 { |
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438 displayBlockSet = KAI2PolHide; |
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439 } |
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440 delete buf8; |
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441 } |
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442 } |
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443 CleanupStack::PopAndDestroy( displayPropertyValue ); |
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444 } |
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445 |
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446 if( !visibilityVisibleSet ) |
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447 { |
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448 displayPropertyValue = PropertyValueL( |
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449 *target, |
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450 XnPropertyNames::style::common::KVisibility ); |
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451 CleanupStack::PushL( displayPropertyValue ); |
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452 |
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453 if( displayPropertyValue ) |
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454 { |
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455 // only if visiblity property is set we affect nodeVisible variable |
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456 HBufC8* buf8 = NULL; |
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457 buf8 = AiUtility::CopyToBufferL( buf8, *displayPropertyValue ); |
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458 if( buf8 ) |
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459 { |
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460 if( *buf8 == XnPropertyNames::style::common::visibility::KVisible ) |
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461 { |
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462 visibilityVisibleSet = KAI2PolShow; |
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463 } |
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464 else |
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465 { |
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466 visibilityVisibleSet = KAI2PolHide; |
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467 } |
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468 delete buf8; |
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469 } |
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470 } |
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471 CleanupStack::PopAndDestroy( displayPropertyValue ); |
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472 } |
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473 } |
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474 |
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475 // At least one value has to be 'not unset' |
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476 // and neither can be 'hide' |
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477 if( ( displayBlockSet || visibilityVisibleSet ) && |
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478 ( ( displayBlockSet != KAI2PolHide ) && |
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479 ( visibilityVisibleSet != KAI2PolHide ) ) ) |
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480 { |
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481 nodeVisible = ETrue; |
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482 } |
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483 |
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484 if( nodeVisible ) |
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485 { |
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486 ++nodesVisible; |
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487 if( !andOperation && !negation ) |
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488 { |
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489 // 'Or' ends to first true |
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490 // 'Not and' ends to first true |
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491 return ETrue; |
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492 } |
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493 } |
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494 else if( !nodeVisible && andOperation && !negation ) |
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495 { |
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496 // 'And' ends to first false |
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497 return EFalse; |
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498 } |
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499 |
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500 parser.SkipSpace(); |
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501 } |
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502 if( nodesVisible > 0 && !negation ) |
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503 { |
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504 return ETrue; |
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505 } |
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506 if( nodesVisible == 0 && negation ) |
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507 { |
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508 return ETrue; |
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509 } |
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510 } |
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511 return EFalse; |
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512 } |
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513 |
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514 // End of file. |