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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
55QT_BEGIN_NAMESPACE
56
57namespace 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
108QT_END_NAMESPACE
109
110#endif
111

source code of qtxmlpatterns/src/xmlpatterns/expr/qcombinenodes_p.h