38a54df863
People keep tripping over the old copyrights and copy-pasting them to new files. Search and replace "Cloudius Systems" with "ScyllaDB". Message-Id: <1460013664-25966-1-git-send-email-penberg@scylladb.com>
123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2014 ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "column_specification.hh"
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#include <memory>
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#include <vector>
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class database;
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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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// Test all elements of toTest for assignment. If all are exact match, return exact match. If any is not assignable,
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// return not assignable. Otherwise, return weakly assignable.
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template <typename AssignmentTestablePtrRange>
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static test_result test_all(database& db, const sstring& keyspace, ::shared_ptr<column_specification> receiver,
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AssignmentTestablePtrRange&& to_test) {
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test_result res = test_result::EXACT_MATCH;
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for (auto&& rt : to_test) {
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if (rt == nullptr) {
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res = test_result::WEAKLY_ASSIGNABLE;
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continue;
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}
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test_result t = rt->test_assignment(db, keyspace, receiver);
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if (t == test_result::NOT_ASSIGNABLE) {
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return test_result::NOT_ASSIGNABLE;
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}
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if (t == test_result::WEAKLY_ASSIGNABLE) {
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res = test_result::WEAKLY_ASSIGNABLE;
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}
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}
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return res;
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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(database& db, const sstring& keyspace, ::shared_ptr<column_specification> receiver) = 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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