//---------------------------------------------------------------------------
static void readIndex(istream& in,map<Register,unsigned>& index,Attribute::Type type,unsigned cardinality)
// Read an index
{
unsigned count;
in.read(reinterpret_cast<char*>(&count),sizeof(count));
if (count!=cardinality) {
cerr << "index corruption encountered, reload the database" << endl;
throw;
}
index.clear();
switch (type) {
case Attribute::Type::Int:
for (unsigned index2=0;index2<count;++index2) {
int val; unsigned pos;
in.read(reinterpret_cast<char*>(&val),sizeof(val)); in.read(reinterpret_cast<char*>(&pos),sizeof(pos));
Register r; r.setInt(val);
index[r]=pos;
}
break;
case Attribute::Type::Double:
for (unsigned index2=0;index2<count;++index2) {
double val; unsigned pos;
in.read(reinterpret_cast<char*>(&val),sizeof(val)); in.read(reinterpret_cast<char*>(&pos),sizeof(pos));
Register r; r.setDouble(val);
index[r]=pos;
}
break;
case Attribute::Type::Bool:
for (unsigned index2=0;index2<count;++index2) {
bool val; unsigned pos;
in.read(reinterpret_cast<char*>(&val),sizeof(val)); in.read(reinterpret_cast<char*>(&pos),sizeof(pos));
Register r; r.setBool(val);
index[r]=pos;
}
break;
case Attribute::Type::String:
for (unsigned index2=0;index2<count;++index2) {
unsigned valLen,pos; string val;
in.read(reinterpret_cast<char*>(&valLen),sizeof(valLen));
val.resize(valLen);
in.read(const_cast<char*>(val.data()),valLen);
in.read(reinterpret_cast<char*>(&pos),sizeof(pos));
Register r; r.setString(val);
index[r]=pos;
}
break;
}
}
