131 lines
4.0 KiB
C++
131 lines
4.0 KiB
C++
/* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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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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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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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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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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#include "components/mysql_server/my_metadata.h"
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my_metadata::my_metadata() {}
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my_metadata::my_metadata(my_metadata &other) : data(other.data) {}
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my_metadata::const_iterator::const_iterator(
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my_unordered_string_to_string_map::const_iterator iter,
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my_unordered_string_to_string_map *data_arg)
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: my_unordered_string_to_string_map::const_iterator(iter), data(data_arg) {}
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/**
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Gets pointer to structure the iterator is iterating over.
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*/
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my_unordered_string_to_string_map *my_metadata::const_iterator::get_data() {
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return data;
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}
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/**
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Checks if iterator is pointing behind the end element.
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*/
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bool my_metadata::const_iterator::is_at_end() {
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return (*static_cast<my_unordered_string_to_string_map::const_iterator *>(
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this)) == data->cend();
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}
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/**
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Sets a value for the name specified.
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Adds to the metadata list if absent. Copies the data into the structure,
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original values don't need to be around after this function is called.
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@param name The name string of the metadata pair to be added.
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@param value The value string of the metadata pair.
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@return Status of performed operation
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@retval false success
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@retval true failure
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*/
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bool my_metadata::set_value(const char *name, const char *value) {
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try {
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my_string key_str = name;
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my_string value_str = value;
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my_unordered_string_to_string_map::iterator it = data.find(key_str);
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if (it != data.end()) {
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it->second = value_str;
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} else {
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data.emplace(std::move(key_str), std::move(value_str));
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}
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return false;
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} catch (...) {
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}
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return true;
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}
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/**
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Gets value for the name specified.
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The value is unmodified if not found.
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Doesn't copy the result value, so it requires synchronization to prevent other
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threads to modify structure.
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@param name The name string of the metadata pair.
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@param [out] value The value string of the metadata pair.
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@return Status of performed operation
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@retval false success
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@retval true failure
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*/
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bool my_metadata::get_value(const char *name, const char **value) {
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try {
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my_unordered_string_to_string_map::const_iterator iter =
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data.find(my_string(name));
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if (iter == data.end()) {
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return true;
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}
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*value = iter->second.c_str();
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return false;
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} catch (...) {
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}
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return true;
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}
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/**
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Creates an iterator over the metadata.
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Positions on the first value.
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@return Reference to the iterator created.
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*/
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my_metadata::const_iterator my_metadata::create_iterator() {
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return my_metadata::const_iterator(data.begin(), &data);
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}
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/**
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Frees an iterator over the metadata.
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Iterator must be allocated through create_iterator();
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@param iter Pointer to the iterator to release.
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@return Status of performed operation
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@retval false success
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@retval true failure
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*/
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bool my_metadata::release_iterator(const_iterator *iter) {
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try {
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delete iter;
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return false;
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} catch (...) {
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}
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return true;
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}
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