68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/*
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* Copyright (C) 2014-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#pragma once
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#include "column_specification.hh"
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#include "data_dictionary/data_dictionary.hh"
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#include <memory>
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#include <vector>
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namespace cql3 {
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class assignment_testable {
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public:
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virtual ~assignment_testable() {}
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enum class test_result {
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EXACT_MATCH,
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WEAKLY_ASSIGNABLE,
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NOT_ASSIGNABLE,
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};
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static bool is_assignable(test_result tr) {
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return tr != test_result::NOT_ASSIGNABLE;
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}
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static bool is_exact_match(test_result tr) {
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return tr != test_result::EXACT_MATCH;
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}
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/**
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* @return whether this object can be assigned to the provided receiver. We distinguish
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* between 3 values:
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* - EXACT_MATCH if this object is exactly of the type expected by the receiver
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* - WEAKLY_ASSIGNABLE if this object is not exactly the expected type but is assignable nonetheless
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* - NOT_ASSIGNABLE if it's not assignable
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* Most caller should just call the isAssignable() method on the result, though functions have a use for
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* testing "strong" equality to decide the most precise overload to pick when multiple could match.
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*/
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virtual test_result test_assignment(data_dictionary::database db, const sstring& keyspace, const column_specification& receiver) const = 0;
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// for error reporting
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virtual sstring assignment_testable_source_context() const = 0;
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};
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inline bool is_assignable(assignment_testable::test_result tr) {
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return assignment_testable::is_assignable(tr);
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}
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inline bool is_exact_match(assignment_testable::test_result tr) {
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return assignment_testable::is_exact_match(tr);
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}
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inline
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std::ostream&
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operator<<(std::ostream& os, const assignment_testable& at) {
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return os << at.assignment_testable_source_context();
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}
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}
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