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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 #include "qcommonvalues_p.h" |
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43 #include "qcommonsequencetypes_p.h" |
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44 #include "qemptysequencetype_p.h" |
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45 |
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46 #include "qemptysequence_p.h" |
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47 |
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48 QT_BEGIN_NAMESPACE |
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49 |
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50 using namespace QPatternist; |
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51 |
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52 Expression::Ptr EmptySequence::create(const Expression *const replacementFor, |
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53 const StaticContext::Ptr &context) |
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54 { |
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55 Q_ASSERT(replacementFor); |
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56 Q_ASSERT(context); |
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57 |
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58 const Expression::Ptr retval(new EmptySequence()); |
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59 context->wrapExpressionWith(replacementFor, retval); |
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60 return retval; |
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61 } |
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62 |
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63 Item::Iterator::Ptr EmptySequence::evaluateSequence(const DynamicContext::Ptr &) const |
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64 { |
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65 return CommonValues::emptyIterator; |
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66 } |
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67 |
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68 Item EmptySequence::evaluateSingleton(const DynamicContext::Ptr &) const |
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69 { |
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70 return Item(); |
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71 } |
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72 |
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73 void EmptySequence::evaluateToSequenceReceiver(const DynamicContext::Ptr &) const |
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74 { |
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75 } |
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76 |
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77 ItemType::Ptr EmptySequence::type() const |
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78 { |
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79 return CommonSequenceTypes::Empty; |
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80 } |
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81 |
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82 SequenceType::Ptr EmptySequence::staticType() const |
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83 { |
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84 return CommonSequenceTypes::Empty; |
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85 } |
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86 |
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87 bool EmptySequence::evaluateEBV(const DynamicContext::Ptr &) const |
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88 { |
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89 return false; |
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90 } |
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91 |
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92 QString EmptySequence::stringValue() const |
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93 { |
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94 return QString(); |
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95 } |
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96 |
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97 ExpressionVisitorResult::Ptr EmptySequence::accept(const ExpressionVisitor::Ptr &visitor) const |
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98 { |
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99 return visitor->visit(this); |
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100 } |
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101 |
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102 Expression::ID EmptySequence::id() const |
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103 { |
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104 return IDEmptySequence; |
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105 } |
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106 |
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107 Expression::Properties EmptySequence::properties() const |
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108 { |
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109 return IsEvaluated; |
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110 } |
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111 |
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112 QT_END_NAMESPACE |