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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_ComparingAggregator_H
51#define Patternist_ComparingAggregator_H
52
53/**
54 * @file qcomparingaggregator_p.h
55 * @short Contains the implementations for the functions <tt>fn:max()</tt>, MaxFN,
56 * and <tt>fn:min()</tt>, MinFN, and the class ComparingAggregator.
57 */
58
59#include <private/qabstractfloat_p.h>
60#include <private/qdecimal_p.h>
61#include <private/qcastingplatform_p.h>
62#include <private/qcomparisonplatform_p.h>
63#include <private/qliteral_p.h>
64#include <private/qaggregator_p.h>
65#include <private/quntypedatomicconverter_p.h>
66#include <private/qpatternistlocale_p.h>
67
68QT_BEGIN_NAMESPACE
69
70namespace QPatternist
71{
72 /**
73 * @short Base class for the implementations of the <tt>fn:min()</tt> and <tt>fn:max()</tt> function.
74 *
75 * What function that more specifically is
76 * followed, depends on how the constructor is called.
77 *
78 * @see MaxFN
79 * @see MinFN
80 * @ingroup Patternist_functions
81 * @author Frans Englich <frans.englich@nokia.com>
82 */
83 template <AtomicComparator::Operator oper, AtomicComparator::ComparisonResult result>
84 class ComparingAggregator : public Aggregator,
85 public ComparisonPlatform<ComparingAggregator<oper, result>,
86 true, AtomicComparator::AsValueComparison,
87 ReportContext::FORG0006>,
88 public CastingPlatform<ComparingAggregator<oper, result>, true>
89 {
90 public:
91 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
92 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
93 const SequenceType::Ptr &reqType);
94
95 inline AtomicComparator::Operator operatorID() const
96 {
97 return oper;
98 }
99
100 inline ItemType::Ptr targetType() const
101 {
102 return BuiltinTypes::xsDouble;
103 }
104
105 private:
106 inline Item applyNumericPromotion(const Item &old,
107 const Item &nev,
108 const Item &newVal) const;
109
110 using ComparisonPlatform<ComparingAggregator<oper, result>,
111 true,
112 AtomicComparator::AsValueComparison,
113 ReportContext::FORG0006>::comparator;
114 using ComparisonPlatform<ComparingAggregator<oper, result>,
115 true,
116 AtomicComparator::AsValueComparison,
117 ReportContext::FORG0006>::fetchComparator;
118 using CastingPlatform<ComparingAggregator<oper, result>, true>::cast;
119 };
120
121#include "qcomparingaggregator_tpl_p.h"
122
123 /**
124 * @short An instantiation of ComparingAggregator suitable for <tt>fn:max()</tt>.
125 *
126 * @ingroup Patternist_functions
127 */
128 typedef ComparingAggregator<AtomicComparator::OperatorGreaterThan, AtomicComparator::GreaterThan> MaxFN;
129
130 /**
131 * @short An instantiation of ComparingAggregator suitable for <tt>fn:max()</tt>.
132 *
133 * @ingroup Patternist_functions
134 */
135 typedef ComparingAggregator<AtomicComparator::OperatorLessThan, AtomicComparator::LessThan> MinFN;
136}
137
138QT_END_NAMESPACE
139
140#endif
141

source code of qtxmlpatterns/src/xmlpatterns/functions/qcomparingaggregator_p.h