bool PgSQLType::canCastTo(PgSQLType type)
{
// If the types are the same of belongs to the same category they naturally can be casted
if(this->type_idx==type.type_idx ||
(isCharacterType() && type.isCharacterType()) ||
(isDateTimeType() && type.isDateTimeType()) ||
(isNumericType() && type.isNumericType()) ||
(isNetworkType() && type.isNetworkType()) ||
//Polymorphics anyarray, anyrange, anynoarray, anyenum to anyelement
((isPolymorphicType() && type==QString("anyelement")) ||
((*this)==QString("anyelement") && type.isPolymorphicType())) ||
//Character to network address
((isCharacterType() || isNetworkType()) &&
(type.isCharacterType() || type.isNetworkType())) ||
//Integer to OID
((isIntegerType() || isOIDType()) &&
(type.isIntegerType() || type.isOIDType())) ||
//abstime to integer
((((*this)==QString("integer") || (*this)==QString("int4")) && type==QString("abstime")) ||
(((*this)==QString("abstime") && (type==QString("integer") || type==QString("int4"))))))
return(true);
return(false);
}
PgSQLType PgSQLType::parseString(const QString &str)
{
QString type_str=str.toLower().simplified(), sptype, interv;
bool with_tz=false;
unsigned len=0, dim=0, srid=0;
int prec=-1;
int start=-1, end=-1;
QStringList value, intervals;
PgSQLType type;
//Checking if the string contains one of interval types
IntervalType::getTypes(intervals);
while(!intervals.isEmpty())
{
interv=intervals.back();
intervals.pop_back();
start=type_str.indexOf(QRegExp(QString("( )") + interv.toLower()));
if(start>=0)
{
type_str.remove(start, interv.size()+1);
break;
}
else
interv.clear();
}
//Check if the type contains "with time zone" descriptor
with_tz=QRegExp(QString("(.)*(with time zone)(.)*")).exactMatch(type_str);
//Removes the timezone descriptor
type_str.remove(QRegExp(QString("(with)(out)*( time zone)")));
//Count the dimension of the type and removes the array descriptor
dim=type_str.count(QString("[]"));
type_str.remove(QString("[]"));
//Check if the type is a variable length type, e.g varchar(200)
if(QRegExp(QString("(.)+\\(( )*[0-9]+( )*\\)")).indexIn(type_str) >=0)
{
start=type_str.indexOf('(');
end=type_str.indexOf(')', start);
len=type_str.mid(start+1, end-start-1).toUInt();
}
//Check if the type is a numeric type, e.g, numeric(10,2)
else if(QRegExp(QString("(.)+\\(( )*[0-9]+( )*(,)( )*[0-9]+( )*\\)")).indexIn(type_str) >=0)
{
start=type_str.indexOf('(');
end=type_str.indexOf(')', start);
value=type_str.mid(start+1, end-start-1).split(',');
len=value[0].toUInt();
prec=value[1].toUInt();
}
//Check if the type is a spatial type (PostGiS), e.g, geography(POINTZ, 4296)
else if(QRegExp(QString("(.)+\\(( )*[a-z]+(( )*(,)( )*[0-9]+( )*)?\\)"), Qt::CaseInsensitive).indexIn(type_str) >=0)
{
start=type_str.indexOf('(');
end=type_str.indexOf(')', start);
value=type_str.mid(start+1, end-start-1).split(',');
sptype=value[0].toUpper();
if(value.size() > 1)
srid=value[1].toUInt();
}
//If the string matches one of the regexp above remove the analyzed parts
if(start >=0 && end>=0)
type_str.remove(start, end-start+1);
/* The resultant string must be only the name of the type without [] and ().
NOTE: Since the string was converted to lower case at start it's necessary to get
it's original form from the input string in order to correctly create the type. */
type_str=str.mid(str.indexOf(type_str, 0, Qt::CaseInsensitive),type_str.length()).trimmed();
try
{
try
{
//Creates the type based on the extracted values
type=PgSQLType(type_str);
}
catch(Exception &)
{
/* In case of error (specially with PostGiS types) split the string to remove
the schema name and try to create the type once more */
QStringList typname=type_str.split('.');
if(typname.size()==2)
type=PgSQLType(typname[1]);
else
{
/* One last try it to check if the type has an entry on user defined types
as pg_catalog.[type name] */
type=PgSQLType(QString("pg_catalog.") + type_str);
}
}
type.setWithTimezone(with_tz);
type.setDimension(dim);
if(type.isNumericType() && len > 0 && prec >=0)
{
type.setLength(len);
type.setPrecision(prec);
}
else if(type.isDateTimeType() && len > 0)
type.setPrecision(len);
else if(type.hasVariableLength() && len > 0)
type.setLength(len);
if(!interv.isEmpty())
type.setIntervalType(IntervalType(interv));
else if(!sptype.isEmpty())
type.setSpatialType(SpatialType(sptype, srid));
return(type);
}
catch(Exception &e)
{
throw Exception(e.getErrorMessage(), e.getErrorType(),__PRETTY_FUNCTION__,__FILE__,__LINE__, &e, str);
}
}