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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 // |
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43 // W A R N I N G |
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44 // ------------- |
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45 // |
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46 // This file is not part of the Qt API. It exists purely as an |
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47 // implementation detail. This header file may change from version to |
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48 // version without notice, or even be removed. |
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49 // |
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50 // We mean it. |
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51 |
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52 #ifndef Patternist_OrderBy_H |
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53 #define Patternist_OrderBy_H |
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54 |
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55 #include "qatomiccomparator_p.h" |
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56 #include "qcomparisonplatform_p.h" |
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57 #include "qsinglecontainer_p.h" |
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58 |
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59 QT_BEGIN_HEADER |
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60 |
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61 QT_BEGIN_NAMESPACE |
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62 |
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63 namespace QPatternist |
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64 { |
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65 class ReturnOrderBy; |
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66 |
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67 /** |
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68 * @short Performs the sorting by being a parent to ForClause. |
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69 * |
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70 * The child of the ForClause is a ReturnOrderBy expression, which collects |
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71 * the sort keys and values. |
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72 * |
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73 * @author Frans Englich <frans.englich@nokia.com> |
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74 * @ingroup Patternist_expressions |
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75 */ |
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76 class OrderBy : public SingleContainer |
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77 { |
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78 public: |
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79 enum Stability |
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80 { |
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81 StableOrder, |
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82 UnstableOrder |
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83 }; |
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84 |
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85 /** |
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86 * This class is value based. |
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87 */ |
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88 class OrderSpec : public ComparisonPlatform<OrderBy::OrderSpec, |
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89 true, /* Yes, issue errors. */ |
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90 AtomicComparator::AsValueComparison> |
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91 { |
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92 public: |
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93 /** |
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94 * We want this guy to be public. |
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95 */ |
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96 using ComparisonPlatform<OrderBy::OrderSpec, true, AtomicComparator::AsValueComparison>::detailedFlexibleCompare; |
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97 |
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98 typedef QVector<OrderSpec> Vector; |
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99 |
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100 enum Direction |
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101 { |
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102 Ascending, |
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103 Descending |
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104 }; |
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105 |
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106 /** |
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107 * @short Default constructor, which is needed by QVector. |
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108 */ |
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109 inline OrderSpec() |
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110 { |
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111 } |
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112 |
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113 inline OrderSpec(const Direction dir, |
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114 const StaticContext::OrderingEmptySequence orderingEmpty) : direction(dir), |
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115 orderingEmptySequence(orderingEmpty) |
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116 { |
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117 } |
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118 |
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119 void prepare(const Expression::Ptr &source, |
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120 const StaticContext::Ptr &context); |
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121 |
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122 const SourceLocationReflection *actualReflection() const |
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123 { |
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124 return m_expr.data(); |
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125 } |
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126 |
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127 private: |
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128 Expression::Ptr m_expr; |
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129 |
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130 public: |
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131 /** |
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132 * We place these afterwards, such that m_expr gets aligned at the |
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133 * start of the address. |
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134 */ |
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135 Direction direction; |
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136 |
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137 StaticContext::OrderingEmptySequence orderingEmptySequence; |
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138 |
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139 inline AtomicComparator::Operator operatorID() const |
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140 { |
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141 return orderingEmptySequence == StaticContext::Least ? AtomicComparator::OperatorLessThanNaNLeast |
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142 : AtomicComparator::OperatorLessThanNaNGreatest; |
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143 } |
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144 |
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145 }; |
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146 |
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147 OrderBy(const Stability stability, |
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148 const OrderSpec::Vector &orderSpecs, |
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149 const Expression::Ptr &operand, |
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150 ReturnOrderBy *const returnOrderBy); |
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151 |
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152 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; |
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153 virtual SequenceType::Ptr staticType() const; |
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154 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
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155 const SequenceType::Ptr &reqType); |
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156 virtual Expression::Ptr compress(const StaticContext::Ptr &context); |
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157 virtual SequenceType::List expectedOperandTypes() const; |
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158 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
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159 |
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160 inline Item::Iterator::Ptr mapToSequence(const Item &i, |
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161 const DynamicContext::Ptr &context) const; |
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162 virtual Properties properties() const; |
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163 |
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164 private: |
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165 /** |
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166 * Needed when calling makeSequenceMappingIterator(). |
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167 */ |
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168 typedef QExplicitlySharedDataPointer<const OrderBy> ConstPtr; |
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169 |
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170 const Stability m_stability; |
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171 OrderSpec::Vector m_orderSpecs; |
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172 ReturnOrderBy *const m_returnOrderBy; |
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173 }; |
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174 |
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175 /* TODO Q_DECLARE_TYPEINFO(OrderBy::OrderSpec, Q_MOVABLE_TYPE); Breaks, |
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176 * probably because it's nested. */ |
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177 } |
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178 |
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179 QT_END_NAMESPACE |
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180 |
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181 QT_END_HEADER |
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182 |
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183 #endif |