org.basex.query.func.db.DbOption Maven / Gradle / Ivy
package org.basex.query.func.db;
import static org.basex.query.QueryError.*;
import org.basex.core.cmd.*;
import org.basex.query.*;
import org.basex.query.func.*;
import org.basex.query.value.item.*;
import org.basex.query.value.map.*;
import org.basex.query.value.seq.*;
import org.basex.util.*;
import org.basex.util.options.*;
/**
* Function implementation.
*
* @author BaseX Team 2005-22, BSD License
* @author Christian Gruen
*/
public final class DbOption extends StandardFunc {
@Override
public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
final byte[] name = toToken(exprs[0], qc);
final Object value = ShowOptions.get(Token.string(Token.uc(name)), qc.context);
if(value == null) throw DB_OPTION_X.get(info, name);
return item(value);
}
/**
* Converts an option value to an XQuery item.
* @param value value
* @return item, or {@code null} for empty sequence
* @throws QueryException query exception
*/
private Item item(final Object value) throws QueryException {
if(value == null) return Empty.VALUE;
if(value instanceof Boolean) return Bln.get((Boolean) value);
if(value instanceof Integer) return Int.get((Integer) value);
if(value instanceof Options) {
XQMap map = XQMap.empty();
final Options opts = (Options) value;
for(final Option opt : opts) {
final Item item = item(opt.value());
if(item != null) map = map.put(Str.get(opt.name()), item, info);
}
return map;
}
// string or enumeration
return Str.get(value.toString());
}
}