124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2.0,
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* as published by the Free Software Foundation.
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*
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* This program is also distributed with certain software (including
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* but not limited to OpenSSL) that is licensed under separate terms,
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* as designated in a particular file or component or in included license
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* documentation. The authors of MySQL hereby grant you an additional
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* permission to link the program and your derivative works with the
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* separately licensed software that they have included with MySQL.
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*
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* This program 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, version 2.0, 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PLUGIN_X_CLIENT_VISITOR_ASSIGN_VISITOR_H_
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#define PLUGIN_X_CLIENT_VISITOR_ASSIGN_VISITOR_H_
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#include <string>
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#include "mysqlxclient/xargument.h"
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#include "plugin/x/client/visitor/default_visitor.h"
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namespace xcl {
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template <typename Destination_type>
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class Assign_visitor : public Default_visitor {
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public:
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Destination_type m_destination;
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bool m_set = false;
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private:
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/*
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This template handles all other types than Destination_type
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that are hold in Argument_value.
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When user gets other type than stored in Argument_value, then this
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callback is executed.
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*/
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template <typename Value1_type, typename Value2_type>
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bool assign(Value1_type *value1, const Value2_type *value2) {
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// Does nothing, types doesn't match
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return false;
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}
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/*
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This specialization template handles the Destination_type that is stored
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in Argument_value.
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When user gets correct type from Argument_value, then this callback is
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executed.
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*/
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template <typename Value1_type>
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bool assign(Value1_type *value1, const Value1_type *value2) {
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*value1 = *value2;
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return true;
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}
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template <typename Value1_type, typename Value2_type>
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void store_and_mark(Value1_type *value1, const Value2_type *value2) {
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m_set = assign(value1, value2);
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}
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private: // Visitor
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void visit_integer(const int64_t value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_uinteger(const uint64_t value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_double(const double value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_float(const float value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_bool(const bool value) { store_and_mark(&m_destination, &value); }
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void visit_object(const Argument_object &value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_uobject(const Argument_uobject &value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_array(const Argument_array &value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_string(const std::string &value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_octet(const std::string &value) {
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store_and_mark(&m_destination, &value);
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}
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void visit_decimal(const std::string &value) {
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store_and_mark(&m_destination, &value);
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}
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};
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template <typename Destination_type>
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bool get_argument_value(const Argument_value &value,
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Destination_type *out_value) {
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Assign_visitor<Destination_type> assign;
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value.accept(&assign);
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if (!assign.m_set) return false;
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*out_value = assign.m_destination;
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return true;
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}
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} // namespace xcl
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#endif // PLUGIN_X_CLIENT_VISITOR_ASSIGN_VISITOR_H_
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