183 lines
7.2 KiB
C++
183 lines
7.2 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 2015 Cloudius Systems
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*
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* Modified by Cloudius Systems
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*/
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#pragma once
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#include <vector>
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#include "cql3/restrictions/single_column_restriction.hh"
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#include "core/shared_ptr.hh"
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#include "to_string.hh"
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#include "cql3/relation.hh"
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#include "cql3/column_identifier.hh"
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#include "cql3/term.hh"
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namespace cql3 {
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/**
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* Relations encapsulate the relationship between an entity of some kind, and
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* a value (term). For example, <key> > "start" or "colname1" = "somevalue".
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*
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*/
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class single_column_relation final : public relation {
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private:
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::shared_ptr<column_identifier::raw> _entity;
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::shared_ptr<term::raw> _map_key;
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::shared_ptr<term::raw> _value;
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std::vector<::shared_ptr<term::raw>> _in_values;
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private:
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single_column_relation(::shared_ptr<column_identifier::raw> entity, ::shared_ptr<term::raw> map_key,
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const operator_type& type, ::shared_ptr<term::raw> value, std::vector<::shared_ptr<term::raw>> in_values)
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: relation(type)
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, _entity(std::move(entity))
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, _map_key(std::move(map_key))
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, _value(std::move(value))
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, _in_values(std::move(in_values))
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{ }
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public:
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/**
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* Creates a new relation.
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*
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* @param entity the kind of relation this is; what the term is being compared to.
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* @param map_key the key into the entity identifying the value the term is being compared to.
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* @param type the type that describes how this entity relates to the value.
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* @param value the value being compared.
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*/
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single_column_relation(::shared_ptr<column_identifier::raw> entity, ::shared_ptr<term::raw> map_key,
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const operator_type& type, ::shared_ptr<term::raw> value)
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: single_column_relation(std::move(entity), std::move(map_key), type, std::move(value), {})
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{ }
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/**
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* Creates a new relation.
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*
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* @param entity the kind of relation this is; what the term is being compared to.
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* @param type the type that describes how this entity relates to the value.
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* @param value the value being compared.
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*/
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single_column_relation(::shared_ptr<column_identifier::raw> entity, const operator_type& type, ::shared_ptr<term::raw> value)
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: single_column_relation(std::move(entity), {}, type, std::move(value))
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{ }
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static ::shared_ptr<single_column_relation> create_in_relation(::shared_ptr<column_identifier::raw> entity,
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std::vector<::shared_ptr<term::raw>> in_values) {
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return ::make_shared(single_column_relation(std::move(entity), {}, operator_type::IN, {}, std::move(in_values)));
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}
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::shared_ptr<column_identifier::raw> get_entity() {
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return _entity;
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}
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::shared_ptr<term::raw> get_map_key() {
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return _map_key;
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}
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protected:
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virtual ::shared_ptr<term> to_term(const std::vector<::shared_ptr<column_specification>>& receivers,
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::shared_ptr<term::raw> raw, database& db, const sstring& keyspace,
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::shared_ptr<variable_specifications> bound_names) override;
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#if 0
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public SingleColumnRelation withNonStrictOperator()
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{
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switch (relationType)
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{
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case GT: return new SingleColumnRelation(entity, operator_type.GTE, value);
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case LT: return new SingleColumnRelation(entity, operator_type.LTE, value);
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default: return this;
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}
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}
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#endif
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virtual sstring to_string() const override {
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auto entity_as_string = _entity->to_string();
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if (_map_key) {
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entity_as_string = sprint("%s[%s]", std::move(entity_as_string), _map_key->to_string());
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}
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if (is_IN()) {
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return sprint("%s IN %s", entity_as_string, ::to_string(_in_values));
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}
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return sprint("%s %s %s", entity_as_string, _relation_type, _value->to_string());
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}
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protected:
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virtual ::shared_ptr<restrictions::restriction> new_EQ_restriction(database& db, schema_ptr schema,
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::shared_ptr<variable_specifications> bound_names);
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virtual ::shared_ptr<restrictions::restriction> new_IN_restriction(database& db, schema_ptr schema,
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::shared_ptr<variable_specifications> bound_names) override;
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virtual ::shared_ptr<restrictions::restriction> new_slice_restriction(database& db, schema_ptr schema,
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::shared_ptr<variable_specifications> bound_names,
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statements::bound bound,
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bool inclusive) override {
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auto&& column_def = to_column_definition(schema, _entity);
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auto term = to_term(to_receivers(schema, column_def), _value, db, schema->ks_name(), std::move(bound_names));
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return ::make_shared<restrictions::single_column_restriction::slice>(column_def, bound, inclusive, std::move(term));
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}
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virtual shared_ptr<restrictions::restriction> new_contains_restriction(database& db, schema_ptr schema,
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::shared_ptr<variable_specifications> bound_names,
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bool is_key) override {
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throw std::runtime_error("not implemented");
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#if 0
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ColumnDefinition columnDef = toColumnDefinition(schema, entity);
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Term term = toTerm(toReceivers(schema, columnDef), value, schema.ksName, bound_names);
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return new SingleColumnRestriction.Contains(columnDef, term, is_key);
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#endif
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}
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private:
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/**
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* Returns the receivers for this relation.
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*
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* @param schema the Column Family meta data
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* @param column_def the column definition
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* @return the receivers for the specified relation.
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* @throws exceptions::invalid_request_exception if the relation is invalid
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*/
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std::vector<::shared_ptr<column_specification>> to_receivers(schema_ptr schema, const column_definition& column_def);
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static shared_ptr<column_specification> make_collection_receiver(shared_ptr<column_specification> receiver, bool for_key) {
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return static_cast<const collection_type_impl*>(receiver->type.get())->make_collection_receiver(receiver, for_key);
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}
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bool is_legal_relation_for_non_frozen_collection() const {
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return is_contains_key() || is_contains() || is_map_entry_equality();
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}
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bool is_map_entry_equality() const {
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return _map_key && is_EQ();
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}
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private:
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bool can_have_only_one_value() {
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return is_EQ() || (is_IN() && _in_values.size() == 1);
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}
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};
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};
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