/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.connector.system.jdbc;
import com.facebook.presto.metadata.QualifiedTablePrefix;
import com.facebook.presto.spi.predicate.Domain;
import com.facebook.presto.spi.predicate.TupleDomain;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;
import io.airlift.slice.Slice;
import java.util.Optional;
final class FilterUtil
{
private FilterUtil() {}
public static Optional<String> stringFilter(TupleDomain<Integer> constraint, int index)
{
if (constraint.isNone()) {
return Optional.empty();
}
Domain domain = constraint.getDomains().get().get(index);
if ((domain == null) || !domain.isSingleValue()) {
return Optional.empty();
}
Object value = domain.getSingleValue();
if (value instanceof Slice) {
return Optional.of(((Slice) value).toStringUtf8());
}
return Optional.empty();
}
public static QualifiedTablePrefix tablePrefix(String catalog, Optional<String> schema, Optional<String> table)
{
QualifiedTablePrefix prefix = new QualifiedTablePrefix(catalog);
if (schema.isPresent()) {
prefix = new QualifiedTablePrefix(catalog, schema.get());
if (table.isPresent()) {
prefix = new QualifiedTablePrefix(catalog, schema.get(), table.get());
}
}
return prefix;
}
public static <T> Iterable<T> filter(Iterable<T> items, Optional<T> filter)
{
if (!filter.isPresent()) {
return items;
}
return Iterables.filter(items, Predicates.equalTo(filter.get()));
}
public static <T> boolean emptyOrEquals(Optional<T> value, T other)
{
return !value.isPresent() || value.get().equals(other);
}
}