/**
* Combines all conditions into a single string keeping only the unique conditions. The result
* need not be consistent.
*
* @param existing A string containing conditions.
* @param additional A BaseX Value containing additional conditions.
* @return A single string containing conditions without duplicates.
*/
@Requires(Permission.NONE)
@Deterministic
public String combine(Str existing, Value additional) {
try {
// create a condition 'container'
Set<String> result = new HashSet<String>();
// store the existing conditions
for (Condition condition : new ConditionGenerator(existing.toJava())) {
result.add(condition.toString());
}
// read all the additional conditions from the sequence.
for (Item item : additional) {
// a single item in the sequence might contain multiple conditions
for (Condition condition : new ConditionGenerator(item.toJava().toString())) {
result.add(condition.toString());
}
}
// join the resulting set on a space
return CollectionUtils.join(result, " ");
} catch (QueryException e) {
// TODO: submit message to BaseX logging (or declare thrown?)
System.err.println("error combining descriptor values: " + e.getMessage());
return "";
}
}
@Override
public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
final String form = string(toToken(exprs[0], qc));
final int es = exprs.length;
final Object[] args = new Object[es - 1];
for (int e = 1; e < es; e++) {
final Item it = exprs[e].item(qc, info);
args[e - 1] = it == null ? null : it.type.isUntyped() ? string(it.string(info)) : it.toJava();
}
try {
return Str.get(String.format(form, args));
} catch (final RuntimeException ex) {
throw ERRFORMAT_X_X.get(info, Util.className(ex), ex);
}
}