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42 #include "qcommonsequencetypes_p.h"
43 #include "qexpressionsequence_p.h"
44 #include "qsorttuple_p.h"
46 #include "qreturnorderby_p.h"
50 using namespace QPatternist;
52 ReturnOrderBy::ReturnOrderBy(const OrderBy::Stability aStability,
53 const OrderBy::OrderSpec::Vector &oSpecs,
54 const Expression::List &ops) : UnlimitedContainer(ops)
55 , m_stability(aStability)
56 , m_orderSpecs(oSpecs)
59 Q_ASSERT_X(m_operands.size() >= 2, Q_FUNC_INFO,
60 "ReturnOrderBy must have the return expression, and at least one sort key.");
61 Q_ASSERT(m_orderSpecs.size() == ops.size() - 1);
64 Item ReturnOrderBy::evaluateSingleton(const DynamicContext::Ptr &context) const
66 Q_ASSERT(m_operands.size() > 1);
67 const Item::Iterator::Ptr value(makeListIterator(m_operands.first()->evaluateSequence(context)->toList()));
68 Item::Vector sortKeys;
70 /* We're skipping the first operand. */
71 const int len = m_operands.size() - 1;
74 for(int i = 1; i <= len; ++i)
75 sortKeys[i - 1] = m_operands.at(i)->evaluateSingleton(context);
77 return Item(new SortTuple(value, sortKeys));
80 bool ReturnOrderBy::evaluateEBV(const DynamicContext::Ptr &context) const
82 // TODO This is temporary code.
83 return m_operands.first()->evaluateEBV(context);
86 Expression::Ptr ReturnOrderBy::compress(const StaticContext::Ptr &context)
88 /* We first did this in typeCheck(), but that broke due to that type checks were
89 * missed, which other pieces relied on. */
92 /* We only want the return expression, not the sort keys. */
93 return m_operands.first()->compress(context);
97 /* We don't need the members, so don't keep a reference to them. */
100 return UnlimitedContainer::compress(context);
104 Expression::Properties ReturnOrderBy::properties() const
106 /* For some unknown reason this is necessary for XQTS test case orderBy18. */
107 return DisableElimination;
110 ExpressionVisitorResult::Ptr ReturnOrderBy::accept(const ExpressionVisitor::Ptr &visitor) const
112 return visitor->visit(this);
115 SequenceType::Ptr ReturnOrderBy::staticType() const
117 return m_operands.first()->staticType();
120 SequenceType::List ReturnOrderBy::expectedOperandTypes() const
122 SequenceType::List result;
123 result.append(CommonSequenceTypes::ZeroOrMoreItems);
124 result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
128 Expression::ID ReturnOrderBy::id() const
130 return IDReturnOrderBy;