io.trino.connector.system.StaticSystemTablesProvider Maven / Gradle / Ivy
/*
* 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 io.trino.connector.system;
import com.google.common.collect.ImmutableSet;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.connector.SchemaTableName;
import io.trino.spi.connector.SystemTable;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import static com.google.common.collect.ImmutableMap.toImmutableMap;
import static java.util.function.Function.identity;
public class StaticSystemTablesProvider
implements SystemTablesProvider
{
private final Set systemTables;
private final Map systemTablesMap;
public StaticSystemTablesProvider(Set systemTables)
{
this.systemTables = ImmutableSet.copyOf(systemTables);
this.systemTablesMap = systemTables.stream()
.collect(toImmutableMap(
table -> table.getTableMetadata().getTable(),
identity()));
}
@Override
public Set listSystemTables(ConnectorSession session)
{
return systemTables;
}
@Override
public Optional getSystemTable(ConnectorSession session, SchemaTableName tableName)
{
return Optional.ofNullable(systemTablesMap.get(tableName));
}
}