public void restart() {
IMDb = 0L;
Oracle = 0L;
try {
clearRecords();
recordsSelect = "SELECT " + userColumn + ", " + objectColumn + ", ";
for (Attribute attr : attributes) {
if (attr.isRelationValued() || attr.name().isEmpty()) continue;
recordsSelect += attr.name() + " ,";
}
recordsSelect = recordsSelect.substring(0, recordsSelect.length() - 1);
recordsSelect += " FROM " + recordsTable;
if (betweenCondition != null) {
recordsSelect += " WHERE " + betweenCondition;
}
if (userID != null) {
// We add where clause, if it is not present
if (betweenCondition == null || !recordsSelect.endsWith(betweenCondition))
recordsSelect += " WHERE ";
// AND if where is already there
else recordsSelect += " AND ";
recordsSelect += userColumn + " = " + userID;
}
recordsStatement = provider.getConn().prepareStatement(recordsSelect);
records = recordsStatement.executeQuery();
records.next();
} catch (Exception e) {
e.printStackTrace();
}
getAttributes();
}
@Override
public int compare(InstanceHolder o1, InstanceHolder o2) {
// both missing is equal
if (o1.m_instance.isMissing(m_attribute) && o2.m_instance.isMissing(m_attribute)) {
return 0;
}
// one missing - missing instances should all be at the end
// regardless of whether order is ascending or descending
if (o1.m_instance.isMissing(m_attribute)) {
return 1;
}
if (o2.m_instance.isMissing(m_attribute)) {
return -1;
}
int cmp = 0;
if (!m_attribute.isString() && !m_attribute.isRelationValued()) {
double val1 = o1.m_instance.value(m_attribute);
double val2 = o2.m_instance.value(m_attribute);
cmp = Double.compare(val1, val2);
} else if (m_attribute.isString()) {
String val1 = o1.m_stringVals.get(m_attribute.name());
String val2 = o2.m_stringVals.get(m_attribute.name());
/*
* String val1 = o1.stringValue(m_attribute); String val2 =
* o2.stringValue(m_attribute);
*/
// TODO case insensitive?
cmp = val1.compareTo(val2);
} else {
throw new IllegalArgumentException(
"Can't sort according to " + "relation-valued attribute values!");
}
if (m_descending) {
return -cmp;
}
return cmp;
}