142 lines
4.6 KiB
C++
142 lines
4.6 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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2015 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 "schema.hh"
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#include "core/shared_ptr.hh"
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#include "cql3/selection/selector.hh"
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#include "cql3/cql3_type.hh"
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#include "cql3/functions/function_name.hh"
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namespace cql3 {
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namespace selection {
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class selectable {
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public:
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virtual ~selectable() {}
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virtual ::shared_ptr<selector::factory> new_selector_factory(database& db, schema_ptr schema, std::vector<const column_definition*>& defs) = 0;
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virtual sstring to_string() const = 0;
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protected:
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static size_t add_and_get_index(const column_definition& def, std::vector<const column_definition*>& defs) {
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auto i = std::find(defs.begin(), defs.end(), &def);
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if (i != defs.end()) {
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return std::distance(defs.begin(), i);
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}
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defs.push_back(&def);
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return defs.size() - 1;
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}
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public:
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class raw {
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public:
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virtual ~raw() {}
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virtual ::shared_ptr<selectable> prepare(schema_ptr s) = 0;
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/**
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* Returns true if any processing is performed on the selected column.
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**/
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virtual bool processes_selection() const = 0;
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};
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class writetime_or_ttl;
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class with_function;
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class with_field_selection;
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class with_cast;
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};
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std::ostream & operator<<(std::ostream &os, const selectable& s);
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class selectable::with_function : public selectable {
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functions::function_name _function_name;
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std::vector<shared_ptr<selectable>> _args;
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public:
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with_function(functions::function_name fname, std::vector<shared_ptr<selectable>> args)
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: _function_name(std::move(fname)), _args(std::move(args)) {
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}
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virtual sstring to_string() const override;
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virtual shared_ptr<selector::factory> new_selector_factory(database& db, schema_ptr s, std::vector<const column_definition*>& defs) override;
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class raw : public selectable::raw {
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functions::function_name _function_name;
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std::vector<shared_ptr<selectable::raw>> _args;
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public:
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raw(functions::function_name function_name, std::vector<shared_ptr<selectable::raw>> args)
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: _function_name(std::move(function_name)), _args(std::move(args)) {
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}
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virtual shared_ptr<selectable> prepare(schema_ptr s) override;
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virtual bool processes_selection() const override;
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};
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};
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class selectable::with_cast : public selectable {
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::shared_ptr<selectable> _arg;
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::shared_ptr<cql3_type> _type;
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public:
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with_cast(::shared_ptr<selectable> arg, ::shared_ptr<cql3_type> type)
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: _arg(std::move(arg)), _type(std::move(type)) {
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}
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virtual sstring to_string() const override;
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virtual shared_ptr<selector::factory> new_selector_factory(database& db, schema_ptr s, std::vector<const column_definition*>& defs) override;
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class raw : public selectable::raw {
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::shared_ptr<selectable::raw> _arg;
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::shared_ptr<cql3_type> _type;
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public:
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raw(shared_ptr<selectable::raw> arg, ::shared_ptr<cql3_type> type)
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: _arg(std::move(arg)), _type(std::move(type)) {
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}
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virtual shared_ptr<selectable> prepare(schema_ptr s) override;
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virtual bool processes_selection() const override;
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};
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};
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}
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}
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