195 lines
4.2 KiB
C++
195 lines
4.2 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2016,
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University in Hagen,
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Faculty of Mathematics and Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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/*
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5.20 Type ~mem~
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This type encapsulates just a string.
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*/
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#ifndef MEM_H
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#define MEM_H
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#include "Attribute.h"
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#include "NestedList.h"
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#include "StandardTypes.h"
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#include "GenericTC.h"
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namespace mm2algebra{
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class Mem: public Attribute{
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public:
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Mem(){}
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Mem(int i) : Attribute(false) {
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strcpy(value,"");
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}
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Mem(const Mem& src): Attribute(src){
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strcpy(value, src.value);
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}
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Mem& operator=(const Mem& src){
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Attribute::operator=(src);
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strcpy(value, src.value);
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return *this;
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}
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~Mem(){}
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void set(const bool def, const std::string& v){
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SetDefined(def);
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if(def){
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strcpy(value,v.c_str());
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}
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}
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std::string GetValue() const{
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assert(IsDefined());
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return std::string(value);
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}
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static const std::string BasicType(){ return "mem"; }
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static const bool checkType(ListExpr type){
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if(!nl->HasLength(type,2)){
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return false;
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}
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if(!listutils::isSymbol(nl->First(type), BasicType())){
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return false;
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}
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// TODO: check whether the second element is a valid type
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return true;
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}
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static ListExpr wrapType(ListExpr type){
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return nl->TwoElemList(nl->SymbolAtom(BasicType()),
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type);
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}
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inline virtual int NumOfFLOBs() const{
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return 0;
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}
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inline virtual Flob* GetFLOB(const int i){
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assert(false);
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return 0;
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}
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int Compare(const Attribute* arg) const{
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if(!IsDefined() && !arg->IsDefined()){
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return 0;
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}
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if(!IsDefined()){
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return -1;
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}
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if(!arg->IsDefined()){
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return 1;
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}
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return strcmp(value,((Mem*)arg)->value);
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}
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bool Adjacent(const Attribute* arg) const{
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return false;
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}
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size_t Sizeof() const{
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return sizeof(*this);
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}
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size_t HashValue() const{
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if(!IsDefined()){
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return 0;
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}
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size_t m = 5;
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size_t l = std::min(m, strlen(value));
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int sum = 0;
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for(size_t i=0;i<l;i++){
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sum = sum*10 + value[i];
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}
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return sum;
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}
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void CopyFrom(const Attribute* arg){
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*this = *((Mem*) arg);
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}
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Attribute* Clone() const{
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return new Mem(*this);
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}
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static ListExpr Property() {
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return gentc::GenProperty( "-> DATA",
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"("+ BasicType() + " <subtype> )",
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"<string>",
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"\"testobj\"");
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}
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static bool CheckKind(ListExpr type, ListExpr& errorInfo){
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return checkType(type);
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}
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bool ReadFrom(ListExpr le, const ListExpr typeInfo){
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if(listutils::isSymbolUndefined(le)){
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SetDefined(false);
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return true;
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}
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if(nl->AtomType(le)!=StringType){
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return false;
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}
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set(true, nl->StringValue(le));
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return true;
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}
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ListExpr ToListExpr( const ListExpr typeInfo){
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if(!IsDefined()){
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return listutils::getUndefined();
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}
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return nl->StringAtom(value);
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}
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static bool requiresTypeCheckInVM(){
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return true;
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}
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private:
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STRING_T value;
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};
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} // end of namespace mm2algebra
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#endif
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