325 lines
7.4 KiB
C++
325 lines
7.4 KiB
C++
/*
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* Copyright (c) 2014, 2018, 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, as
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* 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
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* additional permission to link the program and your derivative works
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* with the separately licensed software that they have included with
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* MySQL.
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*
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* Without limiting anything contained in the foregoing, this file,
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* which is part of MySQL Connector/C++, is also subject to the
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* Universal FOSS Exception, version 1.0, a copy of which can be found at
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* http://oss.oracle.com/licenses/universal-foss-exception.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _SQL_VARIANT_H_
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#define _SQL_VARIANT_H_
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#include <string>
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#include <map>
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#include <list>
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#include <algorithm>
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#include <typeinfo>
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#include "build_config.h"
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#include "sqlstring.h"
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#include "exception.h"
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namespace sql
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{
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class BaseVariantImpl
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{
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public:
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BaseVariantImpl (void *ptr, sql::SQLString vtype) :
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cvptr(ptr),
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vTypeName(vtype)
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{}
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virtual ~BaseVariantImpl() {
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cvptr=NULL;
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}
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virtual BaseVariantImpl* Clone()=0;
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template<class T>
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T* get() const {
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if (typeid(T).name() == typeid(void).name()) {
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return static_cast< T * > (cvptr);
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}
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if ((vTypeName == typeid(std::string).name() &&
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typeid(T).name() == typeid(sql::SQLString).name()) ||
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(vTypeName == typeid(sql::SQLString).name() &&
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typeid(T).name() == typeid(std::string).name()) ||
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(vTypeName == typeid(std::map< std::string, std::string >).name() &&
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typeid(T).name() ==
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typeid(std::map< sql::SQLString, sql::SQLString >).name()) ||
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(vTypeName ==
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typeid(std::map< sql::SQLString, sql::SQLString >).name() &&
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typeid(T).name() ==
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typeid(std::map< std::string, std::string >).name()) ||
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(vTypeName == typeid(std::list< std::string >).name() &&
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typeid(T).name() ==
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typeid(std::list< sql::SQLString >).name()) ||
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(vTypeName ==
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typeid(std::list< sql::SQLString >).name() &&
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typeid(T).name() ==
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typeid(std::list< std::string >).name()))
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{
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return static_cast< T * > (cvptr);
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}
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if (typeid(T).name() != vTypeName) {
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throw sql::InvalidArgumentException("Variant type doesn't match.");
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}
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return static_cast< T * > (cvptr);
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}
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protected:
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void *cvptr;
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sql::SQLString vTypeName;
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};
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template<class T>
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class VariantImpl : public BaseVariantImpl
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{
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public:
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VariantImpl(T i) : BaseVariantImpl(new T(i), typeid(i).name()) {}
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~VariantImpl() {
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destroy_content();
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}
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VariantImpl(VariantImpl& that) : BaseVariantImpl(that) {
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copy_content(that);
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}
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VariantImpl& operator=(VariantImpl& that) {
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if (this != &that) {
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destroy_content();
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if (cvptr == NULL) {
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copy_content(that);
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}
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}
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return *this;
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}
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virtual VariantImpl* Clone() {
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return new VariantImpl(*this);
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}
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private:
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void destroy_content() {
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T *tmp=static_cast< T * >(cvptr);
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if (tmp) {
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delete tmp;
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cvptr=NULL;
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}
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}
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void copy_content(BaseVariantImpl& that) {
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cvptr=new T (*(static_cast< T * > (that.get< void >())));
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}
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};
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template<class T>
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class VariantMap : public BaseVariantImpl
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{
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public:
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VariantMap(T i) : BaseVariantImpl(new T(i), typeid(i).name()) {}
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~VariantMap() {
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destroy_content();
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}
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VariantMap(VariantMap& that) : BaseVariantImpl(that) {
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if (this != &that) {
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copy_content(that);
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}
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}
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VariantMap& operator=(VariantMap& that) {
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if (this != &that) {
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destroy_content();
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copy_content(that);
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}
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return *this;
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}
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virtual VariantMap* Clone() {
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return new VariantMap(*this);
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}
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private:
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void destroy_content() {
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T *tmp=static_cast< T *> (cvptr);
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if (tmp) {
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tmp->clear();
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delete tmp;
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cvptr=NULL;
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}
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}
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void copy_content(VariantMap& var) {
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T *tmp=static_cast< T *> (var.cvptr);
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if (tmp) {
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cvptr=new T();
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typename T::const_iterator cit=tmp->begin();
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while(cit != tmp->end()) {
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(static_cast< T * >(cvptr))->insert(
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std::make_pair(sql::SQLString(cit->first),
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sql::SQLString(cit->second)));
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++cit;
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}
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}
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}
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};
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template<class T>
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class VariantList : public BaseVariantImpl
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{
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public:
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VariantList(T i) : BaseVariantImpl(new T(i), typeid(i).name()) {}
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~VariantList() {
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destroy_content();
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}
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VariantList(VariantList& that) : BaseVariantImpl(that) {
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if (this != &that) {
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copy_content(that);
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}
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}
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VariantList& operator=(VariantList& that) {
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if (this != &that) {
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destroy_content();
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copy_content(that);
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}
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return *this;
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}
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virtual VariantList* Clone() {
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return new VariantList(*this);
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}
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private:
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void destroy_content()
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{
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T *tmp=static_cast< T *> (cvptr);
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if (tmp) {
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tmp->clear();
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delete tmp;
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cvptr=NULL;
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}
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}
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void copy_content(VariantList& var)
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{
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T *tmp=static_cast< T *> (var.cvptr);
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if (tmp) {
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cvptr=new T();
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typename T::const_iterator cit=tmp->begin();
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while(cit != tmp->end()) {
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(static_cast< T * >(cvptr))->push_back(sql::SQLString(*cit));
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++cit;
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}
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}
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}
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};
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class CPPCONN_PUBLIC_FUNC Variant
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{
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public:
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Variant(const int &i=0) :
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variant(new VariantImpl< int >(i)) {}
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Variant(const double &i) :
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variant(new VariantImpl< double >(i)) {}
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Variant(const bool &i) :
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variant(new VariantImpl< bool >(i)) {}
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Variant(const char* i) :
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variant(new VariantImpl< sql::SQLString >(i)) {}
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Variant(const std::string &i) :
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variant(new VariantImpl< sql::SQLString >(i)) {}
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Variant(const sql::SQLString &i) :
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variant(new VariantImpl< sql::SQLString >(i)) {}
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Variant(const std::list< std::string > &i) :
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variant(new VariantList< std::list < std::string > >(i)) {}
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Variant(const std::list< sql::SQLString > &i) :
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variant(new VariantList< std::list < sql::SQLString > >(i)) {}
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Variant(const std::map< std::string, std::string > &i) :
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variant(new VariantMap< std::map< std::string, std::string > >(i)) {}
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Variant(const std::map< sql::SQLString, sql::SQLString > &i) :
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variant(new VariantMap< std::map< sql::SQLString, sql::SQLString > >(i)) {}
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~Variant() {
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if (variant) {
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delete variant;
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variant=0;
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}
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}
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Variant(const Variant& that) {
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if (this != &that) {
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variant=that.variant->Clone();
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}
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}
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Variant& operator=(const Variant& that) {
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if (this != &that) {
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delete variant;
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variant=that.variant->Clone();
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}
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return *this;
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}
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template<class T>
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T* get() const {
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return variant->get<T>();
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}
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private:
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BaseVariantImpl *variant;
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};
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} /* namespace sql */
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#endif /* _SQL_VARIANT_H_ */
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