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39 | |
40 | // |
41 | // W A R N I N G |
42 | // ------------- |
43 | // |
44 | // This file is not part of the Qt API. It exists purely as an |
45 | // implementation detail. This header file may change from version to |
46 | // version without notice, or even be removed. |
47 | // |
48 | // We mean it. |
49 | |
50 | #ifndef Patternist_CombineNodes_H |
51 | #define Patternist_CombineNodes_H |
52 | |
53 | #include <private/qpaircontainer_p.h> |
54 | |
55 | QT_BEGIN_NAMESPACE |
56 | |
57 | namespace QPatternist |
58 | { |
59 | /** |
60 | * @short Implements XPath 2.0's operators for combining node sequences: @c union, |
61 | * @c intersect and @c except. |
62 | * |
63 | * @see <a href="http://www.w3.org/TR/xquery/#combining_seq">XQuery 1.0: An XML Query |
64 | * Language, 3.3.3 Combining QXmlNodeModelIndex Sequences</a> |
65 | * @author Frans Englich <frans.englich@nokia.com> |
66 | * @ingroup Patternist_expressions |
67 | */ |
68 | class Q_AUTOTEST_EXPORT CombineNodes : public PairContainer |
69 | { |
70 | public: |
71 | enum Operator |
72 | { |
73 | Union = 1, |
74 | Intersect = 2, |
75 | Except = 4 |
76 | }; |
77 | |
78 | CombineNodes(const Expression::Ptr &operand1, |
79 | const Operator op, |
80 | const Expression::Ptr &operand2); |
81 | |
82 | virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; |
83 | virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; |
84 | virtual bool evaluateEBV(const DynamicContext::Ptr &context) const; |
85 | virtual SequenceType::Ptr staticType() const; |
86 | virtual SequenceType::List expectedOperandTypes() const; |
87 | virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
88 | const SequenceType::Ptr &reqType); |
89 | |
90 | Operator operatorID() const; |
91 | virtual ID id() const; |
92 | |
93 | /** |
94 | * Determines the string representation for operator @p op. |
95 | * |
96 | * @return "union" if @p op is Union, "intersect" if @p op |
97 | * is Intersect and "except" if @p op is Except. |
98 | */ |
99 | static QString displayName(const Operator op); |
100 | |
101 | virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
102 | |
103 | private: |
104 | const Operator m_operator; |
105 | }; |
106 | } |
107 | |
108 | QT_END_NAMESPACE |
109 | |
110 | #endif |
111 | |